path: root/deps/jemalloc/configure.ac

dnl Process this file with autoconf to produce a configure script.
AC_PREREQ(2.68)
AC_INIT([Makefile.in])

AC_CONFIG_AUX_DIR([build-aux])

dnl ============================================================================
dnl Custom macro definitions.

dnl JE_CONCAT_VVV(r, a, b)
dnl
dnl Set $r to the concatenation of $a and $b, with a space separating them iff
dnl both $a and $b are non-empty.
AC_DEFUN([JE_CONCAT_VVV],
if test "x[$]{$2}" = "x" -o "x[$]{$3}" = "x" ; then
  $1="[$]{$2}[$]{$3}"
else
  $1="[$]{$2} [$]{$3}"
fi
)

dnl JE_APPEND_VS(a, b)
dnl
dnl Set $a to the concatenation of $a and b, with a space separating them iff
dnl both $a and b are non-empty.
AC_DEFUN([JE_APPEND_VS],
  T_APPEND_V=$2
  JE_CONCAT_VVV($1, $1, T_APPEND_V)
)

CONFIGURE_CFLAGS=
SPECIFIED_CFLAGS="${CFLAGS}"
dnl JE_CFLAGS_ADD(cflag)
dnl
dnl CFLAGS is the concatenation of CONFIGURE_CFLAGS and SPECIFIED_CFLAGS
dnl (ignoring EXTRA_CFLAGS, which does not impact configure tests.  This macro
dnl appends to CONFIGURE_CFLAGS and regenerates CFLAGS.
AC_DEFUN([JE_CFLAGS_ADD],
[
AC_MSG_CHECKING([whether compiler supports $1])
T_CONFIGURE_CFLAGS="${CONFIGURE_CFLAGS}"
JE_APPEND_VS(CONFIGURE_CFLAGS, $1)
JE_CONCAT_VVV(CFLAGS, CONFIGURE_CFLAGS, SPECIFIED_CFLAGS)
AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
[[
]], [[
    return 0;
]])],
              [je_cv_cflags_added=$1]
              AC_MSG_RESULT([yes]),
              [je_cv_cflags_added=]
              AC_MSG_RESULT([no])
              [CONFIGURE_CFLAGS="${T_CONFIGURE_CFLAGS}"]
)
JE_CONCAT_VVV(CFLAGS, CONFIGURE_CFLAGS, SPECIFIED_CFLAGS)
])

dnl JE_CFLAGS_SAVE()
dnl JE_CFLAGS_RESTORE()
dnl
dnl Save/restore CFLAGS.  Nesting is not supported.
AC_DEFUN([JE_CFLAGS_SAVE],
SAVED_CONFIGURE_CFLAGS="${CONFIGURE_CFLAGS}"
)
AC_DEFUN([JE_CFLAGS_RESTORE],
CONFIGURE_CFLAGS="${SAVED_CONFIGURE_CFLAGS}"
JE_CONCAT_VVV(CFLAGS, CONFIGURE_CFLAGS, SPECIFIED_CFLAGS)
)

CONFIGURE_CXXFLAGS=
SPECIFIED_CXXFLAGS="${CXXFLAGS}"
dnl JE_CXXFLAGS_ADD(cxxflag)
AC_DEFUN([JE_CXXFLAGS_ADD],
[
AC_MSG_CHECKING([whether compiler supports $1])
T_CONFIGURE_CXXFLAGS="${CONFIGURE_CXXFLAGS}"
JE_APPEND_VS(CONFIGURE_CXXFLAGS, $1)
JE_CONCAT_VVV(CXXFLAGS, CONFIGURE_CXXFLAGS, SPECIFIED_CXXFLAGS)
AC_LANG_PUSH([C++])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
[[
]], [[
    return 0;
]])],
              [je_cv_cxxflags_added=$1]
              AC_MSG_RESULT([yes]),
              [je_cv_cxxflags_added=]
              AC_MSG_RESULT([no])
              [CONFIGURE_CXXFLAGS="${T_CONFIGURE_CXXFLAGS}"]
)
AC_LANG_POP([C++])
JE_CONCAT_VVV(CXXFLAGS, CONFIGURE_CXXFLAGS, SPECIFIED_CXXFLAGS)
])

dnl JE_COMPILABLE(label, hcode, mcode, rvar)
dnl
dnl Use AC_LINK_IFELSE() rather than AC_COMPILE_IFELSE() so that linker errors
dnl cause failure.
AC_DEFUN([JE_COMPILABLE],
[
AC_CACHE_CHECK([whether $1 is compilable],
               [$4],
               [AC_LINK_IFELSE([AC_LANG_PROGRAM([$2],
                                                [$3])],
                               [$4=yes],
                               [$4=no])])
])

dnl ============================================================================

CONFIG=`echo ${ac_configure_args} | sed -e 's#'"'"'\([^ ]*\)'"'"'#\1#g'`
AC_SUBST([CONFIG])

dnl Library revision.
rev=2
AC_SUBST([rev])

srcroot=$srcdir
if test "x${srcroot}" = "x." ; then
  srcroot=""
else
  srcroot="${srcroot}/"
fi
AC_SUBST([srcroot])
abs_srcroot="`cd \"${srcdir}\"; pwd`/"
AC_SUBST([abs_srcroot])

objroot=""
AC_SUBST([objroot])
abs_objroot="`pwd`/"
AC_SUBST([abs_objroot])

dnl Munge install path variables.
case "$prefix" in
   *\ * ) AC_MSG_ERROR([Prefix should not contain spaces]) ;;
   "NONE" ) prefix="/usr/local" ;;
esac
case "$exec_prefix" in
   *\ * ) AC_MSG_ERROR([Exec prefix should not contain spaces]) ;;
   "NONE" ) exec_prefix=$prefix ;;
esac
PREFIX=$prefix
AC_SUBST([PREFIX])
BINDIR=`eval echo $bindir`
BINDIR=`eval echo $BINDIR`
AC_SUBST([BINDIR])
INCLUDEDIR=`eval echo $includedir`
INCLUDEDIR=`eval echo $INCLUDEDIR`
AC_SUBST([INCLUDEDIR])
LIBDIR=`eval echo $libdir`
LIBDIR=`eval echo $LIBDIR`
AC_SUBST([LIBDIR])
DATADIR=`eval echo $datadir`
DATADIR=`eval echo $DATADIR`
AC_SUBST([DATADIR])
MANDIR=`eval echo $mandir`
MANDIR=`eval echo $MANDIR`
AC_SUBST([MANDIR])

dnl Support for building documentation.
AC_PATH_PROG([XSLTPROC], [xsltproc], [false], [$PATH])
if test -d "/usr/share/xml/docbook/stylesheet/docbook-xsl" ; then
  DEFAULT_XSLROOT="/usr/share/xml/docbook/stylesheet/docbook-xsl"
elif test -d "/usr/share/sgml/docbook/xsl-stylesheets" ; then
  DEFAULT_XSLROOT="/usr/share/sgml/docbook/xsl-stylesheets"
else
  dnl Documentation building will fail if this default gets used.
  DEFAULT_XSLROOT=""
fi
AC_ARG_WITH([xslroot],
  [AS_HELP_STRING([--with-xslroot=<path>], [XSL stylesheet root path])], [
if test "x$with_xslroot" = "xno" ; then
  XSLROOT="${DEFAULT_XSLROOT}"
else
  XSLROOT="${with_xslroot}"
fi
],
  XSLROOT="${DEFAULT_XSLROOT}"
)
if test "x$XSLTPROC" = "xfalse" ; then
  XSLROOT=""
fi
AC_SUBST([XSLROOT])

dnl If CFLAGS isn't defined, set CFLAGS to something reasonable.  Otherwise,
dnl just prevent autoconf from molesting CFLAGS.
CFLAGS=$CFLAGS
AC_PROG_CC

if test "x$GCC" != "xyes" ; then
  AC_CACHE_CHECK([whether compiler is MSVC],
                 [je_cv_msvc],
                 [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([],
                                                     [
#ifndef _MSC_VER
  int fail[-1];
#endif
])],
                               [je_cv_msvc=yes],
                               [je_cv_msvc=no])])
fi

dnl check if a cray prgenv wrapper compiler is being used
je_cv_cray_prgenv_wrapper=""
if test "x${PE_ENV}" != "x" ; then
  case "${CC}" in
    CC|cc)
	je_cv_cray_prgenv_wrapper="yes"
	;;
    *)
       ;;
  esac
fi

AC_CACHE_CHECK([whether compiler is cray],
              [je_cv_cray],
              [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([],
                                                  [
#ifndef _CRAYC
  int fail[-1];
#endif
])],
                            [je_cv_cray=yes],
                            [je_cv_cray=no])])

if test "x${je_cv_cray}" = "xyes" ; then
  AC_CACHE_CHECK([whether cray compiler version is 8.4],
                [je_cv_cray_84],
                [AC_COMPILE_IFELSE([AC_LANG_PROGRAM([],
                                                      [
#if !(_RELEASE_MAJOR == 8 && _RELEASE_MINOR == 4)
  int fail[-1];
#endif
])],
                              [je_cv_cray_84=yes],
                              [je_cv_cray_84=no])])
fi

if test "x$GCC" = "xyes" ; then
  JE_CFLAGS_ADD([-std=gnu11])
  if test "x$je_cv_cflags_added" = "x-std=gnu11" ; then
    AC_DEFINE_UNQUOTED([JEMALLOC_HAS_RESTRICT], [ ], [ ])
  else
    JE_CFLAGS_ADD([-std=gnu99])
    if test "x$je_cv_cflags_added" = "x-std=gnu99" ; then
      AC_DEFINE_UNQUOTED([JEMALLOC_HAS_RESTRICT], [ ], [ ])
    fi
  fi
  JE_CFLAGS_ADD([-Werror=unknown-warning-option])
  JE_CFLAGS_ADD([-Wall])
  JE_CFLAGS_ADD([-Wextra])
  JE_CFLAGS_ADD([-Wshorten-64-to-32])
  JE_CFLAGS_ADD([-Wsign-compare])
  JE_CFLAGS_ADD([-Wundef])
  JE_CFLAGS_ADD([-Wno-format-zero-length])
  JE_CFLAGS_ADD([-Wpointer-arith])
  dnl This warning triggers on the use of the universal zero initializer, which
  dnl is a very handy idiom for things like the tcache static initializer (which
  dnl has lots of nested structs).  See the discussion at.
  dnl https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53119
  JE_CFLAGS_ADD([-Wno-missing-braces])
  dnl This one too.
  JE_CFLAGS_ADD([-Wno-missing-field-initializers])
  JE_CFLAGS_ADD([-Wno-missing-attributes])
  JE_CFLAGS_ADD([-pipe])
  JE_CFLAGS_ADD([-g3])
elif test "x$je_cv_msvc" = "xyes" ; then
  CC="$CC -nologo"
  JE_CFLAGS_ADD([-Zi])
  JE_CFLAGS_ADD([-MT])
  JE_CFLAGS_ADD([-W3])
  JE_CFLAGS_ADD([-FS])
  JE_APPEND_VS(CPPFLAGS, -I${srcdir}/include/msvc_compat)
fi
if test "x$je_cv_cray" = "xyes" ; then
  dnl cray compiler 8.4 has an inlining bug
  if test "x$je_cv_cray_84" = "xyes" ; then
    JE_CFLAGS_ADD([-hipa2])
    JE_CFLAGS_ADD([-hnognu])
  fi
  dnl ignore unreachable code warning
  JE_CFLAGS_ADD([-hnomessage=128])
  dnl ignore redefinition of "malloc", "free", etc warning
  JE_CFLAGS_ADD([-hnomessage=1357])
fi
AC_SUBST([CONFIGURE_CFLAGS])
AC_SUBST([SPECIFIED_CFLAGS])
AC_SUBST([EXTRA_CFLAGS])
AC_PROG_CPP

AC_ARG_ENABLE([cxx],
  [AS_HELP_STRING([--disable-cxx], [Disable C++ integration])],
if test "x$enable_cxx" = "xno" ; then
  enable_cxx="0"
else
  enable_cxx="1"
fi
,
enable_cxx="1"
)
if test "x$enable_cxx" = "x1" ; then
  dnl Require at least c++14, which is the first version to support sized
  dnl deallocation.  C++ support is not compiled otherwise.
  m4_include([m4/ax_cxx_compile_stdcxx.m4])
  AX_CXX_COMPILE_STDCXX([17], [noext], [optional])
  if test "x${HAVE_CXX17}" != "x1"; then
    AX_CXX_COMPILE_STDCXX([14], [noext], [optional])
  fi
  if test "x${HAVE_CXX14}" = "x1" -o "x${HAVE_CXX17}" = "x1"; then
    JE_CXXFLAGS_ADD([-Wall])
    JE_CXXFLAGS_ADD([-Wextra])
    JE_CXXFLAGS_ADD([-g3])

    SAVED_LIBS="${LIBS}"
    JE_APPEND_VS(LIBS, -lstdc++)
    JE_COMPILABLE([libstdc++ linkage], [
#include <stdlib.h>
], [[
	int *arr = (int *)malloc(sizeof(int) * 42);
	if (arr == NULL)
		return 1;
]], [je_cv_libstdcxx])
    if test "x${je_cv_libstdcxx}" = "xno" ; then
      LIBS="${SAVED_LIBS}"
    fi
  else
    enable_cxx="0"
  fi
fi
if test "x$enable_cxx" = "x1"; then
  AC_DEFINE([JEMALLOC_ENABLE_CXX], [ ], [ ])
fi
AC_SUBST([enable_cxx])
AC_SUBST([CONFIGURE_CXXFLAGS])
AC_SUBST([SPECIFIED_CXXFLAGS])
AC_SUBST([EXTRA_CXXFLAGS])

AC_C_BIGENDIAN([ac_cv_big_endian=1], [ac_cv_big_endian=0])
if test "x${ac_cv_big_endian}" = "x1" ; then
  AC_DEFINE_UNQUOTED([JEMALLOC_BIG_ENDIAN], [ ], [ ])
fi

if test "x${je_cv_msvc}" = "xyes" -a "x${ac_cv_header_inttypes_h}" = "xno"; then
  JE_APPEND_VS(CPPFLAGS, -I${srcdir}/include/msvc_compat/C99)
fi

if test "x${je_cv_msvc}" = "xyes" ; then
  LG_SIZEOF_PTR=LG_SIZEOF_PTR_WIN
  AC_MSG_RESULT([Using a predefined value for sizeof(void *): 4 for 32-bit, 8 for 64-bit])
else
  AC_CHECK_SIZEOF([void *])
  if test "x${ac_cv_sizeof_void_p}" = "x8" ; then
    LG_SIZEOF_PTR=3
  elif test "x${ac_cv_sizeof_void_p}" = "x4" ; then
    LG_SIZEOF_PTR=2
  else
    AC_MSG_ERROR([Unsupported pointer size: ${ac_cv_sizeof_void_p}])
  fi
fi
AC_DEFINE_UNQUOTED([LG_SIZEOF_PTR], [$LG_SIZEOF_PTR], [ ])

AC_CHECK_SIZEOF([int])
if test "x${ac_cv_sizeof_int}" = "x8" ; then
  LG_SIZEOF_INT=3
elif test "x${ac_cv_sizeof_int}" = "x4" ; then
  LG_SIZEOF_INT=2
else
  AC_MSG_ERROR([Unsupported int size: ${ac_cv_sizeof_int}])
fi
AC_DEFINE_UNQUOTED([LG_SIZEOF_INT], [$LG_SIZEOF_INT], [ ])

AC_CHECK_SIZEOF([long])
if test "x${ac_cv_sizeof_long}" = "x8" ; then
  LG_SIZEOF_LONG=3
elif test "x${ac_cv_sizeof_long}" = "x4" ; then
  LG_SIZEOF_LONG=2
else
  AC_MSG_ERROR([Unsupported long size: ${ac_cv_sizeof_long}])
fi
AC_DEFINE_UNQUOTED([LG_SIZEOF_LONG], [$LG_SIZEOF_LONG], [ ])

AC_CHECK_SIZEOF([long long])
if test "x${ac_cv_sizeof_long_long}" = "x8" ; then
  LG_SIZEOF_LONG_LONG=3
elif test "x${ac_cv_sizeof_long_long}" = "x4" ; then
  LG_SIZEOF_LONG_LONG=2
else
  AC_MSG_ERROR([Unsupported long long size: ${ac_cv_sizeof_long_long}])
fi
AC_DEFINE_UNQUOTED([LG_SIZEOF_LONG_LONG], [$LG_SIZEOF_LONG_LONG], [ ])

AC_CHECK_SIZEOF([intmax_t])
if test "x${ac_cv_sizeof_intmax_t}" = "x16" ; then
  LG_SIZEOF_INTMAX_T=4
elif test "x${ac_cv_sizeof_intmax_t}" = "x8" ; then
  LG_SIZEOF_INTMAX_T=3
elif test "x${ac_cv_sizeof_intmax_t}" = "x4" ; then
  LG_SIZEOF_INTMAX_T=2
else
  AC_MSG_ERROR([Unsupported intmax_t size: ${ac_cv_sizeof_intmax_t}])
fi
AC_DEFINE_UNQUOTED([LG_SIZEOF_INTMAX_T], [$LG_SIZEOF_INTMAX_T], [ ])

AC_CANONICAL_HOST
dnl CPU-specific settings.
CPU_SPINWAIT=""
case "${host_cpu}" in
  i686|x86_64)
	HAVE_CPU_SPINWAIT=1
	if test "x${je_cv_msvc}" = "xyes" ; then
	    AC_CACHE_VAL([je_cv_pause_msvc],
	      [JE_COMPILABLE([pause instruction MSVC], [],
					[[_mm_pause(); return 0;]],
					[je_cv_pause_msvc])])
	    if test "x${je_cv_pause_msvc}" = "xyes" ; then
		CPU_SPINWAIT='_mm_pause()'
	    fi
	else
	    AC_CACHE_VAL([je_cv_pause],
	      [JE_COMPILABLE([pause instruction], [],
					[[__asm__ volatile("pause"); return 0;]],
					[je_cv_pause])])
	    if test "x${je_cv_pause}" = "xyes" ; then
		CPU_SPINWAIT='__asm__ volatile("pause")'
	    fi
	fi
	;;
  aarch64|arm*)
	HAVE_CPU_SPINWAIT=1
	dnl isb is a better equivalent to the pause instruction on x86.
	AC_CACHE_VAL([je_cv_isb],
	  [JE_COMPILABLE([isb instruction], [],
			[[__asm__ volatile("isb"); return 0;]],
			[je_cv_isb])])
	if test "x${je_cv_isb}" = "xyes" ; then
	    CPU_SPINWAIT='__asm__ volatile("isb")'
	fi
	;;
  *)
	HAVE_CPU_SPINWAIT=0
	;;
esac
AC_DEFINE_UNQUOTED([HAVE_CPU_SPINWAIT], [$HAVE_CPU_SPINWAIT], [ ])
AC_DEFINE_UNQUOTED([CPU_SPINWAIT], [$CPU_SPINWAIT], [ ])

AC_ARG_WITH([lg_vaddr],
  [AS_HELP_STRING([--with-lg-vaddr=<lg-vaddr>], [Number of significant virtual address bits])],
  [LG_VADDR="$with_lg_vaddr"], [LG_VADDR="detect"])

case "${host_cpu}" in
  aarch64)
    if test "x$LG_VADDR" = "xdetect"; then
      AC_MSG_CHECKING([number of significant virtual address bits])
      if test "x${LG_SIZEOF_PTR}" = "x2" ; then
        #aarch64 ILP32
        LG_VADDR=32
      else
        #aarch64 LP64
        LG_VADDR=48
      fi
      AC_MSG_RESULT([$LG_VADDR])
    fi
    ;;
  x86_64)
    if test "x$LG_VADDR" = "xdetect"; then
      AC_CACHE_CHECK([number of significant virtual address bits],
                     [je_cv_lg_vaddr],
                     AC_RUN_IFELSE([AC_LANG_PROGRAM(
[[
#include <stdio.h>
#ifdef _WIN32
#include <limits.h>
#include <intrin.h>
typedef unsigned __int32 uint32_t;
#else
#include <stdint.h>
#endif
]], [[
	uint32_t r[[4]];
	uint32_t eax_in = 0x80000008U;
#ifdef _WIN32
	__cpuid((int *)r, (int)eax_in);
#else
	asm volatile ("cpuid"
	    : "=a" (r[[0]]), "=b" (r[[1]]), "=c" (r[[2]]), "=d" (r[[3]])
	    : "a" (eax_in), "c" (0)
	);
#endif
	uint32_t eax_out = r[[0]];
	uint32_t vaddr = ((eax_out & 0x0000ff00U) >> 8);
	FILE *f = fopen("conftest.out", "w");
	if (f == NULL) {
		return 1;
	}
	if (vaddr > (sizeof(void *) << 3)) {
		vaddr = sizeof(void *) << 3;
	}
	fprintf(f, "%u", vaddr);
	fclose(f);
	return 0;
]])],
                   [je_cv_lg_vaddr=`cat conftest.out`],
                   [je_cv_lg_vaddr=error],
                   [je_cv_lg_vaddr=57]))
      if test "x${je_cv_lg_vaddr}" != "x" ; then
        LG_VADDR="${je_cv_lg_vaddr}"
      fi
      if test "x${LG_VADDR}" != "xerror" ; then
        AC_DEFINE_UNQUOTED([LG_VADDR], [$LG_VADDR], [ ])
      else
        AC_MSG_ERROR([cannot determine number of significant virtual address bits])
      fi
    fi
    ;;
  *)
    if test "x$LG_VADDR" = "xdetect"; then
      AC_MSG_CHECKING([number of significant virtual address bits])
      if test "x${LG_SIZEOF_PTR}" = "x3" ; then
        LG_VADDR=64
      elif test "x${LG_SIZEOF_PTR}" = "x2" ; then
        LG_VADDR=32
      elif test "x${LG_SIZEOF_PTR}" = "xLG_SIZEOF_PTR_WIN" ; then
        LG_VADDR="(1U << (LG_SIZEOF_PTR_WIN+3))"
      else
        AC_MSG_ERROR([Unsupported lg(pointer size): ${LG_SIZEOF_PTR}])
      fi
      AC_MSG_RESULT([$LG_VADDR])
    fi
    ;;
esac
AC_DEFINE_UNQUOTED([LG_VADDR], [$LG_VADDR], [ ])

LD_PRELOAD_VAR="LD_PRELOAD"
so="so"
importlib="${so}"
o="$ac_objext"
a="a"
exe="$ac_exeext"
libprefix="lib"
link_whole_archive="0"
DSO_LDFLAGS='-shared -Wl,-soname,$(@F)'
RPATH='-Wl,-rpath,$(1)'
SOREV="${so}.${rev}"
PIC_CFLAGS='-fPIC -DPIC'
CTARGET='-o $@'
LDTARGET='-o $@'
TEST_LD_MODE=
EXTRA_LDFLAGS=
ARFLAGS='crs'
AROUT=' $@'
CC_MM=1

if test "x$je_cv_cray_prgenv_wrapper" = "xyes" ; then
  TEST_LD_MODE='-dynamic'
fi

if test "x${je_cv_cray}" = "xyes" ; then
  CC_MM=
fi

AN_MAKEVAR([AR], [AC_PROG_AR])
AN_PROGRAM([ar], [AC_PROG_AR])
AC_DEFUN([AC_PROG_AR], [AC_CHECK_TOOL(AR, ar, :)])
AC_PROG_AR

AN_MAKEVAR([NM], [AC_PROG_NM])
AN_PROGRAM([nm], [AC_PROG_NM])
AC_DEFUN([AC_PROG_NM], [AC_CHECK_TOOL(NM, nm, :)])
AC_PROG_NM

AC_PROG_AWK

dnl ============================================================================
dnl jemalloc version.
dnl

AC_ARG_WITH([version],
  [AS_HELP_STRING([--with-version=<major>.<minor>.<bugfix>-<nrev>-g<gid>],
   [Version string])],
  [
    echo "${with_version}" | grep ['^[0-9]\+\.[0-9]\+\.[0-9]\+-[0-9]\+-g[0-9a-f]\+$'] 2>&1 1>/dev/null
    if test $? -eq 0 ; then
      echo "$with_version" > "${objroot}VERSION"
    else
      echo "${with_version}" | grep ['^VERSION$'] 2>&1 1>/dev/null
      if test $? -ne 0 ; then
        AC_MSG_ERROR([${with_version} does not match <major>.<minor>.<bugfix>-<nrev>-g<gid> or VERSION])
      fi
    fi
  ], [
    dnl Set VERSION if source directory is inside a git repository.
    if test "x`test ! \"${srcroot}\" && cd \"${srcroot}\"; git rev-parse --is-inside-work-tree 2>/dev/null`" = "xtrue" ; then
      dnl Pattern globs aren't powerful enough to match both single- and
      dnl double-digit version numbers, so iterate over patterns to support up
      dnl to version 99.99.99 without any accidental matches.
      for pattern in ['[0-9].[0-9].[0-9]' '[0-9].[0-9].[0-9][0-9]' \
                     '[0-9].[0-9][0-9].[0-9]' '[0-9].[0-9][0-9].[0-9][0-9]' \
                     '[0-9][0-9].[0-9].[0-9]' '[0-9][0-9].[0-9].[0-9][0-9]' \
                     '[0-9][0-9].[0-9][0-9].[0-9]' \
                     '[0-9][0-9].[0-9][0-9].[0-9][0-9]']; do
        (test ! "${srcroot}" && cd "${srcroot}"; git describe --long --abbrev=40 --match="${pattern}") > "${objroot}VERSION.tmp" 2>/dev/null
        if test $? -eq 0 ; then
          mv "${objroot}VERSION.tmp" "${objroot}VERSION"
          break
        fi
      done
    fi
    rm -f "${objroot}VERSION.tmp"
  ])

if test ! -e "${objroot}VERSION" ; then
  if test ! -e "${srcroot}VERSION" ; then
    AC_MSG_RESULT(
      [Missing VERSION file, and unable to generate it; creating bogus VERSION])
    echo "0.0.0-0-g000000missing_version_try_git_fetch_tags" > "${objroot}VERSION"
  else
    cp ${srcroot}VERSION ${objroot}VERSION
  fi
fi
jemalloc_version=`cat "${objroot}VERSION"`
jemalloc_version_major=`echo ${jemalloc_version} | tr ".g-" " " | awk '{print [$]1}'`
jemalloc_version_minor=`echo ${jemalloc_version} | tr ".g-" " " | awk '{print [$]2}'`
jemalloc_version_bugfix=`echo ${jemalloc_version} | tr ".g-" " " | awk '{print [$]3}'`
jemalloc_version_nrev=`echo ${jemalloc_version} | tr ".g-" " " | awk '{print [$]4}'`
jemalloc_version_gid=`echo ${jemalloc_version} | tr ".g-" " " | awk '{print [$]5}'`
AC_SUBST([jemalloc_version])
AC_SUBST([jemalloc_version_major])
AC_SUBST([jemalloc_version_minor])
AC_SUBST([jemalloc_version_bugfix])
AC_SUBST([jemalloc_version_nrev])
AC_SUBST([jemalloc_version_gid])

dnl Platform-specific settings.  abi and RPATH can probably be determined
dnl programmatically, but doing so is error-prone, which makes it generally
dnl not worth the trouble.
dnl
dnl Define cpp macros in CPPFLAGS, rather than doing AC_DEFINE(macro), since the
dnl definitions need to be seen before any headers are included, which is a pain
dnl to make happen otherwise.
default_retain="0"
zero_realloc_default_free="0"
maps_coalesce="1"
DUMP_SYMS="${NM} -a"
SYM_PREFIX=""
case "${host}" in
  *-*-darwin* | *-*-ios*)
	abi="macho"
	RPATH=""
	LD_PRELOAD_VAR="DYLD_INSERT_LIBRARIES"
	so="dylib"
	importlib="${so}"
	force_tls="0"
	DSO_LDFLAGS='-shared -Wl,-install_name,$(LIBDIR)/$(@F)'
	SOREV="${rev}.${so}"
	sbrk_deprecated="1"
	SYM_PREFIX="_"
	;;
  *-*-freebsd*)
	JE_APPEND_VS(CPPFLAGS, -D_BSD_SOURCE)
	abi="elf"
	AC_DEFINE([JEMALLOC_SYSCTL_VM_OVERCOMMIT], [ ], [ ])
	force_lazy_lock="1"
	;;
  *-*-dragonfly*)
	abi="elf"
	;;
  *-*-openbsd*)
	abi="elf"
	force_tls="0"
	;;
  *-*-bitrig*)
	abi="elf"
	;;
  *-*-linux-android*)
	dnl syscall(2) and secure_getenv(3) are exposed by _GNU_SOURCE.
	JE_APPEND_VS(CPPFLAGS, -D_GNU_SOURCE)
	abi="elf"
	glibc="0"
	AC_DEFINE([JEMALLOC_PURGE_MADVISE_DONTNEED_ZEROS], [ ], [ ])
	AC_DEFINE([JEMALLOC_HAS_ALLOCA_H], [ ], [ ])
	AC_DEFINE([JEMALLOC_PROC_SYS_VM_OVERCOMMIT_MEMORY], [ ], [ ])
	AC_DEFINE([JEMALLOC_THREADED_INIT], [ ], [ ])
	AC_DEFINE([JEMALLOC_C11_ATOMICS], [ ], [ ])
	force_tls="0"
	if test "${LG_SIZEOF_PTR}" = "3"; then
	  default_retain="1"
	fi
	zero_realloc_default_free="1"
	;;
  *-*-linux*)
	dnl syscall(2) and secure_getenv(3) are exposed by _GNU_SOURCE.
	JE_APPEND_VS(CPPFLAGS, -D_GNU_SOURCE)
	abi="elf"
	glibc="1"
	AC_DEFINE([JEMALLOC_PURGE_MADVISE_DONTNEED_ZEROS], [ ], [ ])
	AC_DEFINE([JEMALLOC_HAS_ALLOCA_H], [ ], [ ])
	AC_DEFINE([JEMALLOC_PROC_SYS_VM_OVERCOMMIT_MEMORY], [ ], [ ])
	AC_DEFINE([JEMALLOC_THREADED_INIT], [ ], [ ])
	AC_DEFINE([JEMALLOC_USE_CXX_THROW], [ ], [ ])
	if test "${LG_SIZEOF_PTR}" = "3"; then
	  default_retain="1"
	fi
	zero_realloc_default_free="1"
	;;
  *-*-kfreebsd*)
	dnl syscall(2) and secure_getenv(3) are exposed by _GNU_SOURCE.
	JE_APPEND_VS(CPPFLAGS, -D_GNU_SOURCE)
	abi="elf"
	AC_DEFINE([JEMALLOC_HAS_ALLOCA_H], [ ], [ ])
	AC_DEFINE([JEMALLOC_SYSCTL_VM_OVERCOMMIT], [ ], [ ])
	AC_DEFINE([JEMALLOC_THREADED_INIT], [ ], [ ])
	AC_DEFINE([JEMALLOC_USE_CXX_THROW], [ ], [ ])
	;;
  *-*-netbsd*)
	AC_MSG_CHECKING([ABI])
        AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
[[#ifdef __ELF__
/* ELF */
#else
#error aout
#endif
]])],
                          [abi="elf"],
                          [abi="aout"])
	AC_MSG_RESULT([$abi])
	;;
  *-*-solaris2*)
	abi="elf"
	RPATH='-Wl,-R,$(1)'
	dnl Solaris needs this for sigwait().
	JE_APPEND_VS(CPPFLAGS, -D_POSIX_PTHREAD_SEMANTICS)
	JE_APPEND_VS(LIBS, -lposix4 -lsocket -lnsl)
	;;
  *-ibm-aix*)
	if test "${LG_SIZEOF_PTR}" = "3"; then
	  dnl 64bit AIX
	  LD_PRELOAD_VAR="LDR_PRELOAD64"
	else
	  dnl 32bit AIX
	  LD_PRELOAD_VAR="LDR_PRELOAD"
	fi
	abi="xcoff"
	;;
  *-*-mingw* | *-*-cygwin*)
	abi="pecoff"
	force_tls="0"
	maps_coalesce="0"
	RPATH=""
	so="dll"
	if test "x$je_cv_msvc" = "xyes" ; then
	  importlib="lib"
	  DSO_LDFLAGS="-LD"
	  EXTRA_LDFLAGS="-link -DEBUG"
	  CTARGET='-Fo$@'
	  LDTARGET='-Fe$@'
	  AR='lib'
	  ARFLAGS='-nologo -out:'
	  AROUT='$@'
	  CC_MM=
        else
	  importlib="${so}"
	  DSO_LDFLAGS="-shared"
	  link_whole_archive="1"
	fi
	case "${host}" in
	  *-*-cygwin*)
	    DUMP_SYMS="dumpbin /SYMBOLS"
	    ;;
	  *)
	    ;;
	esac
	a="lib"
	libprefix=""
	SOREV="${so}"
	PIC_CFLAGS=""
	if test "${LG_SIZEOF_PTR}" = "3"; then
	  default_retain="1"
	fi
	zero_realloc_default_free="1"
	;;
  *-*-nto-qnx)
	abi="elf"
  force_tls="0"
  AC_DEFINE([JEMALLOC_HAS_ALLOCA_H], [ ], [ ])
	;;
  *)
	AC_MSG_RESULT([Unsupported operating system: ${host}])
	abi="elf"
	;;
esac

JEMALLOC_USABLE_SIZE_CONST=const
AC_CHECK_HEADERS([malloc.h], [
  AC_MSG_CHECKING([whether malloc_usable_size definition can use const argument])
  AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
    [#include <malloc.h>
     #include <stddef.h>
    size_t malloc_usable_size(const void *ptr);
    ],
    [])],[
                AC_MSG_RESULT([yes])
         ],[
                JEMALLOC_USABLE_SIZE_CONST=
                AC_MSG_RESULT([no])
         ])
])
AC_DEFINE_UNQUOTED([JEMALLOC_USABLE_SIZE_CONST], [$JEMALLOC_USABLE_SIZE_CONST], [ ])
AC_SUBST([abi])
AC_SUBST([RPATH])
AC_SUBST([LD_PRELOAD_VAR])
AC_SUBST([so])
AC_SUBST([importlib])
AC_SUBST([o])
AC_SUBST([a])
AC_SUBST([exe])
AC_SUBST([libprefix])
AC_SUBST([link_whole_archive])
AC_SUBST([DSO_LDFLAGS])
AC_SUBST([EXTRA_LDFLAGS])
AC_SUBST([SOREV])
AC_SUBST([PIC_CFLAGS])
AC_SUBST([CTARGET])
AC_SUBST([LDTARGET])
AC_SUBST([TEST_LD_MODE])
AC_SUBST([MKLIB])
AC_SUBST([ARFLAGS])
AC_SUBST([AROUT])
AC_SUBST([DUMP_SYMS])
AC_SUBST([CC_MM])

dnl Determine whether libm must be linked to use e.g. log(3).
AC_SEARCH_LIBS([log], [m], , [AC_MSG_ERROR([Missing math functions])])
if test "x$ac_cv_search_log" != "xnone required" ; then
  LM="$ac_cv_search_log"
else
  LM=
fi
AC_SUBST(LM)

JE_COMPILABLE([__attribute__ syntax],
              [static __attribute__((unused)) void foo(void){}],
              [],
              [je_cv_attribute])
if test "x${je_cv_attribute}" = "xyes" ; then
  AC_DEFINE([JEMALLOC_HAVE_ATTR], [ ], [ ])
  if test "x${GCC}" = "xyes" -a "x${abi}" = "xelf"; then
    JE_CFLAGS_ADD([-fvisibility=hidden])
    JE_CXXFLAGS_ADD([-fvisibility=hidden])
  fi
fi
dnl Check for tls_model attribute support (clang 3.0 still lacks support).
JE_CFLAGS_SAVE()
JE_CFLAGS_ADD([-Werror])
JE_CFLAGS_ADD([-herror_on_warning])
JE_COMPILABLE([tls_model attribute], [],
              [static __thread int
               __attribute__((tls_model("initial-exec"), unused)) foo;
               foo = 0;],
              [je_cv_tls_model])
JE_CFLAGS_RESTORE()
dnl (Setting of JEMALLOC_TLS_MODEL is done later, after we've checked for
dnl --disable-initial-exec-tls)

dnl Check for alloc_size attribute support.
JE_CFLAGS_SAVE()
JE_CFLAGS_ADD([-Werror])
JE_CFLAGS_ADD([-herror_on_warning])
JE_COMPILABLE([alloc_size attribute], [#include <stdlib.h>],
              [void *foo(size_t size) __attribute__((alloc_size(1)));],
              [je_cv_alloc_size])
JE_CFLAGS_RESTORE()
if test "x${je_cv_alloc_size}" = "xyes" ; then
  AC_DEFINE([JEMALLOC_HAVE_ATTR_ALLOC_SIZE], [ ], [ ])
fi
dnl Check for format(gnu_printf, ...) attribute support.
JE_CFLAGS_SAVE()
JE_CFLAGS_ADD([-Werror])
JE_CFLAGS_ADD([-herror_on_warning])
JE_COMPILABLE([format(gnu_printf, ...) attribute], [#include <stdlib.h>],
              [void *foo(const char *format, ...) __attribute__((format(gnu_printf, 1, 2)));],
              [je_cv_format_gnu_printf])
JE_CFLAGS_RESTORE()
if test "x${je_cv_format_gnu_printf}" = "xyes" ; then
  AC_DEFINE([JEMALLOC_HAVE_ATTR_FORMAT_GNU_PRINTF], [ ], [ ])
fi
dnl Check for format(printf, ...) attribute support.
JE_CFLAGS_SAVE()
JE_CFLAGS_ADD([-Werror])
JE_CFLAGS_ADD([-herror_on_warning])
JE_COMPILABLE([format(printf, ...) attribute], [#include <stdlib.h>],
              [void *foo(const char *format, ...) __attribute__((format(printf, 1, 2)));],
              [je_cv_format_printf])
JE_CFLAGS_RESTORE()
if test "x${je_cv_format_printf}" = "xyes" ; then
  AC_DEFINE([JEMALLOC_HAVE_ATTR_FORMAT_PRINTF], [ ], [ ])
fi

dnl Check for format_arg(...) attribute support.
JE_CFLAGS_SAVE()
JE_CFLAGS_ADD([-Werror])
JE_CFLAGS_ADD([-herror_on_warning])
JE_COMPILABLE([format(printf, ...) attribute], [#include <stdlib.h>],
              [const char * __attribute__((__format_arg__(1))) foo(const char *format);],
              [je_cv_format_arg])
JE_CFLAGS_RESTORE()
if test "x${je_cv_format_arg}" = "xyes" ; then
  AC_DEFINE([JEMALLOC_HAVE_ATTR_FORMAT_ARG], [ ], [ ])
fi

dnl Check for fallthrough attribute support.
JE_CFLAGS_SAVE()
JE_CFLAGS_ADD([-Wimplicit-fallthrough])
JE_COMPILABLE([fallthrough attribute],
              [#if !__has_attribute(fallthrough)
               #error "foo"
               #endif],
              [int x = 0;
               switch (x) {
               case 0: __attribute__((__fallthrough__));
               case 1: return 1;
               }],
              [je_cv_fallthrough])
JE_CFLAGS_RESTORE()
if test "x${je_cv_fallthrough}" = "xyes" ; then
  AC_DEFINE([JEMALLOC_HAVE_ATTR_FALLTHROUGH], [ ], [ ])
  JE_CFLAGS_ADD([-Wimplicit-fallthrough])
  JE_CXXFLAGS_ADD([-Wimplicit-fallthrough])
fi

dnl Check for cold attribute support.
JE_CFLAGS_SAVE()
JE_CFLAGS_ADD([-Werror])
JE_CFLAGS_ADD([-herror_on_warning])
JE_COMPILABLE([cold attribute], [],
              [__attribute__((__cold__)) void foo();],
              [je_cv_cold])
JE_CFLAGS_RESTORE()
if test "x${je_cv_cold}" = "xyes" ; then
  AC_DEFINE([JEMALLOC_HAVE_ATTR_COLD], [ ], [ ])
fi

dnl Check for VM_MAKE_TAG for mmap support.
JE_COMPILABLE([vm_make_tag],
	      [#include <sys/mman.h>
	       #include <mach/vm_statistics.h>],
	      [void *p;
	       p = mmap(0, 16, PROT_READ, MAP_ANON|MAP_PRIVATE, VM_MAKE_TAG(1), 0);
	       munmap(p, 16);],
	      [je_cv_vm_make_tag])
if test "x${je_cv_vm_make_tag}" = "xyes" ; then
  AC_DEFINE([JEMALLOC_HAVE_VM_MAKE_TAG], [ ], [ ])
fi

dnl Support optional additions to rpath.
AC_ARG_WITH([rpath],
  [AS_HELP_STRING([--with-rpath=<rpath>], [Colon-separated rpath (ELF systems only)])],
if test "x$with_rpath" = "xno" ; then
  RPATH_EXTRA=
else
  RPATH_EXTRA="`echo $with_rpath | tr \":\" \" \"`"
fi,
  RPATH_EXTRA=
)
AC_SUBST([RPATH_EXTRA])

dnl Disable rules that do automatic regeneration of configure output by default.
AC_ARG_ENABLE([autogen],
  [AS_HELP_STRING([--enable-autogen], [Automatically regenerate configure output])],
if test "x$enable_autogen" = "xno" ; then
  enable_autogen="0"
else
  enable_autogen="1"
fi
,
enable_autogen="0"
)
AC_SUBST([enable_autogen])

AC_PROG_INSTALL
AC_PROG_RANLIB
AC_PATH_PROG([LD], [ld], [false], [$PATH])
AC_PATH_PROG([AUTOCONF], [autoconf], [false], [$PATH])

dnl Enable documentation
AC_ARG_ENABLE([doc],
	      [AS_HELP_STRING([--enable-doc], [Build documentation])],
if test "x$enable_doc" = "xno" ; then
  enable_doc="0"
else
  enable_doc="1"
fi
,
enable_doc="1"
)
AC_SUBST([enable_doc])

dnl Enable shared libs
AC_ARG_ENABLE([shared],
  [AS_HELP_STRING([--enable-shared], [Build shared libaries])],
if test "x$enable_shared" = "xno" ; then
  enable_shared="0"
else
  enable_shared="1"
fi
,
enable_shared="1"
)
AC_SUBST([enable_shared])

dnl Enable static libs
AC_ARG_ENABLE([static],
  [AS_HELP_STRING([--enable-static], [Build static libaries])],
if test "x$enable_static" = "xno" ; then
  enable_static="0"
else
  enable_static="1"
fi
,
enable_static="1"
)
AC_SUBST([enable_static])

if test "$enable_shared$enable_static" = "00" ; then
  AC_MSG_ERROR([Please enable one of shared or static builds])
fi

dnl Perform no name mangling by default.
AC_ARG_WITH([mangling],
  [AS_HELP_STRING([--with-mangling=<map>], [Mangle symbols in <map>])],
  [mangling_map="$with_mangling"], [mangling_map=""])

dnl Do not prefix public APIs by default.
AC_ARG_WITH([jemalloc_prefix],
  [AS_HELP_STRING([--with-jemalloc-prefix=<prefix>], [Prefix to prepend to all public APIs])],
  [JEMALLOC_PREFIX="$with_jemalloc_prefix"],
  [if test "x$abi" != "xmacho" -a "x$abi" != "xpecoff"; then
  JEMALLOC_PREFIX=""
else
  JEMALLOC_PREFIX="je_"
fi]
)
if test "x$JEMALLOC_PREFIX" = "x" ; then
  AC_DEFINE([JEMALLOC_IS_MALLOC], [ ], [ ])
else
  JEMALLOC_CPREFIX=`echo ${JEMALLOC_PREFIX} | tr "a-z" "A-Z"`
  AC_DEFINE_UNQUOTED([JEMALLOC_PREFIX], ["$JEMALLOC_PREFIX"], [ ])
  AC_DEFINE_UNQUOTED([JEMALLOC_CPREFIX], ["$JEMALLOC_CPREFIX"], [ ])
fi
AC_SUBST([JEMALLOC_PREFIX])
AC_SUBST([JEMALLOC_CPREFIX])

AC_ARG_WITH([export],
  [AS_HELP_STRING([--without-export], [disable exporting jemalloc public APIs])],
  [if test "x$with_export" = "xno"; then
  AC_DEFINE([JEMALLOC_EXPORT],[], [ ])
fi]
)

public_syms="aligned_alloc calloc dallocx free mallctl mallctlbymib mallctlnametomib malloc malloc_conf malloc_conf_2_conf_harder malloc_message malloc_stats_print malloc_usable_size mallocx smallocx_${jemalloc_version_gid} nallocx posix_memalign rallocx realloc sallocx sdallocx xallocx"
dnl Check for additional platform-specific public API functions.
AC_CHECK_FUNC([memalign],
	      [AC_DEFINE([JEMALLOC_OVERRIDE_MEMALIGN], [ ], [ ])
	       public_syms="${public_syms} memalign"])
AC_CHECK_FUNC([valloc],
	      [AC_DEFINE([JEMALLOC_OVERRIDE_VALLOC], [ ], [ ])
	       public_syms="${public_syms} valloc"])
AC_CHECK_FUNC([malloc_size],
	      [AC_DEFINE([JEMALLOC_HAVE_MALLOC_SIZE], [ ], [ ])
	       public_syms="${public_syms} malloc_size"])

dnl Check for allocator-related functions that should be wrapped.
wrap_syms=
if test "x${JEMALLOC_PREFIX}" = "x" ; then
  AC_CHECK_FUNC([__libc_calloc],
		[AC_DEFINE([JEMALLOC_OVERRIDE___LIBC_CALLOC], [ ], [ ])
		 wrap_syms="${wrap_syms} __libc_calloc"])
  AC_CHECK_FUNC([__libc_free],
		[AC_DEFINE([JEMALLOC_OVERRIDE___LIBC_FREE], [ ], [ ])
		 wrap_syms="${wrap_syms} __libc_free"])
  AC_CHECK_FUNC([__libc_malloc],
		[AC_DEFINE([JEMALLOC_OVERRIDE___LIBC_MALLOC], [ ], [ ])
		 wrap_syms="${wrap_syms} __libc_malloc"])
  AC_CHECK_FUNC([__libc_memalign],
		[AC_DEFINE([JEMALLOC_OVERRIDE___LIBC_MEMALIGN], [ ], [ ])
		 wrap_syms="${wrap_syms} __libc_memalign"])
  AC_CHECK_FUNC([__libc_realloc],
		[AC_DEFINE([JEMALLOC_OVERRIDE___LIBC_REALLOC], [ ], [ ])
		 wrap_syms="${wrap_syms} __libc_realloc"])
  AC_CHECK_FUNC([__libc_valloc],
		[AC_DEFINE([JEMALLOC_OVERRIDE___LIBC_VALLOC], [ ], [ ])
		 wrap_syms="${wrap_syms} __libc_valloc"])
  AC_CHECK_FUNC([__posix_memalign],
		[AC_DEFINE([JEMALLOC_OVERRIDE___POSIX_MEMALIGN], [ ], [ ])
		 wrap_syms="${wrap_syms} __posix_memalign"])
fi

case "${host}" in
  *-*-mingw* | *-*-cygwin*)
    wrap_syms="${wrap_syms} tls_callback"
    ;;
  *)
    ;;
esac

dnl Mangle library-private APIs.
AC_ARG_WITH([private_namespace],
  [AS_HELP_STRING([--with-private-namespace=<prefix>], [Prefix to prepend to all library-private APIs])],
  [JEMALLOC_PRIVATE_NAMESPACE="${with_private_namespace}je_"],
  [JEMALLOC_PRIVATE_NAMESPACE="je_"]
)
AC_DEFINE_UNQUOTED([JEMALLOC_PRIVATE_NAMESPACE], [$JEMALLOC_PRIVATE_NAMESPACE], [ ])
private_namespace="$JEMALLOC_PRIVATE_NAMESPACE"
AC_SUBST([private_namespace])

dnl Do not add suffix to installed files by default.
AC_ARG_WITH([install_suffix],
  [AS_HELP_STRING([--with-install-suffix=<suffix>], [Suffix to append to all installed files])],
  [case "$with_install_suffix" in
   *\ * ) AC_MSG_ERROR([Install suffix should not contain spaces]) ;;
   * ) INSTALL_SUFFIX="$with_install_suffix" ;;
esac],
  [INSTALL_SUFFIX=]
)
install_suffix="$INSTALL_SUFFIX"
AC_SUBST([install_suffix])

dnl Specify default malloc_conf.
AC_ARG_WITH([malloc_conf],
  [AS_HELP_STRING([--with-malloc-conf=<malloc_conf>], [config.malloc_conf options string])],
  [JEMALLOC_CONFIG_MALLOC_CONF="$with_malloc_conf"],
  [JEMALLOC_CONFIG_MALLOC_CONF=""]
)
config_malloc_conf="$JEMALLOC_CONFIG_MALLOC_CONF"
AC_DEFINE_UNQUOTED([JEMALLOC_CONFIG_MALLOC_CONF], ["$config_malloc_conf"], [ ])

dnl Substitute @je_@ in jemalloc_protos.h.in, primarily to make generation of
dnl jemalloc_protos_jet.h easy.
je_="je_"
AC_SUBST([je_])

cfgoutputs_in="Makefile.in"
cfgoutputs_in="${cfgoutputs_in} jemalloc.pc.in"
cfgoutputs_in="${cfgoutputs_in} doc/html.xsl.in"
cfgoutputs_in="${cfgoutputs_in} doc/manpages.xsl.in"
cfgoutputs_in="${cfgoutputs_in} doc/jemalloc.xml.in"
cfgoutputs_in="${cfgoutputs_in} include/jemalloc/jemalloc_macros.h.in"
cfgoutputs_in="${cfgoutputs_in} include/jemalloc/jemalloc_protos.h.in"
cfgoutputs_in="${cfgoutputs_in} include/jemalloc/jemalloc_typedefs.h.in"
cfgoutputs_in="${cfgoutputs_in} include/jemalloc/internal/jemalloc_preamble.h.in"
cfgoutputs_in="${cfgoutputs_in} test/test.sh.in"
cfgoutputs_in="${cfgoutputs_in} test/include/test/jemalloc_test.h.in"

cfgoutputs_out="Makefile"
cfgoutputs_out="${cfgoutputs_out} jemalloc.pc"
cfgoutputs_out="${cfgoutputs_out} doc/html.xsl"
cfgoutputs_out="${cfgoutputs_out} doc/manpages.xsl"
cfgoutputs_out="${cfgoutputs_out} doc/jemalloc.xml"
cfgoutputs_out="${cfgoutputs_out} include/jemalloc/jemalloc_macros.h"
cfgoutputs_out="${cfgoutputs_out} include/jemalloc/jemalloc_protos.h"
cfgoutputs_out="${cfgoutputs_out} include/jemalloc/jemalloc_typedefs.h"
cfgoutputs_out="${cfgoutputs_out} include/jemalloc/internal/jemalloc_preamble.h"
cfgoutputs_out="${cfgoutputs_out} test/test.sh"
cfgoutputs_out="${cfgoutputs_out} test/include/test/jemalloc_test.h"

cfgoutputs_tup="Makefile"
cfgoutputs_tup="${cfgoutputs_tup} jemalloc.pc:jemalloc.pc.in"
cfgoutputs_tup="${cfgoutputs_tup} doc/html.xsl:doc/html.xsl.in"
cfgoutputs_tup="${cfgoutputs_tup} doc/manpages.xsl:doc/manpages.xsl.in"
cfgoutputs_tup="${cfgoutputs_tup} doc/jemalloc.xml:doc/jemalloc.xml.in"
cfgoutputs_tup="${cfgoutputs_tup} include/jemalloc/jemalloc_macros.h:include/jemalloc/jemalloc_macros.h.in"
cfgoutputs_tup="${cfgoutputs_tup} include/jemalloc/jemalloc_protos.h:include/jemalloc/jemalloc_protos.h.in"
cfgoutputs_tup="${cfgoutputs_tup} include/jemalloc/jemalloc_typedefs.h:include/jemalloc/jemalloc_typedefs.h.in"
cfgoutputs_tup="${cfgoutputs_tup} include/jemalloc/internal/jemalloc_preamble.h"
cfgoutputs_tup="${cfgoutputs_tup} test/test.sh:test/test.sh.in"
cfgoutputs_tup="${cfgoutputs_tup} test/include/test/jemalloc_test.h:test/include/test/jemalloc_test.h.in"

cfghdrs_in="include/jemalloc/jemalloc_defs.h.in"
cfghdrs_in="${cfghdrs_in} include/jemalloc/internal/jemalloc_internal_defs.h.in"
cfghdrs_in="${cfghdrs_in} include/jemalloc/internal/private_symbols.sh"
cfghdrs_in="${cfghdrs_in} include/jemalloc/internal/private_namespace.sh"
cfghdrs_in="${cfghdrs_in} include/jemalloc/internal/public_namespace.sh"
cfghdrs_in="${cfghdrs_in} include/jemalloc/internal/public_unnamespace.sh"
cfghdrs_in="${cfghdrs_in} include/jemalloc/jemalloc_rename.sh"
cfghdrs_in="${cfghdrs_in} include/jemalloc/jemalloc_mangle.sh"
cfghdrs_in="${cfghdrs_in} include/jemalloc/jemalloc.sh"
cfghdrs_in="${cfghdrs_in} test/include/test/jemalloc_test_defs.h.in"

cfghdrs_out="include/jemalloc/jemalloc_defs.h"
cfghdrs_out="${cfghdrs_out} include/jemalloc/jemalloc${install_suffix}.h"
cfghdrs_out="${cfghdrs_out} include/jemalloc/internal/private_symbols.awk"
cfghdrs_out="${cfghdrs_out} include/jemalloc/internal/private_symbols_jet.awk"
cfghdrs_out="${cfghdrs_out} include/jemalloc/internal/public_symbols.txt"
cfghdrs_out="${cfghdrs_out} include/jemalloc/internal/public_namespace.h"
cfghdrs_out="${cfghdrs_out} include/jemalloc/internal/public_unnamespace.h"
cfghdrs_out="${cfghdrs_out} include/jemalloc/jemalloc_protos_jet.h"
cfghdrs_out="${cfghdrs_out} include/jemalloc/jemalloc_rename.h"
cfghdrs_out="${cfghdrs_out} include/jemalloc/jemalloc_mangle.h"
cfghdrs_out="${cfghdrs_out} include/jemalloc/jemalloc_mangle_jet.h"
cfghdrs_out="${cfghdrs_out} include/jemalloc/internal/jemalloc_internal_defs.h"
cfghdrs_out="${cfghdrs_out} test/include/test/jemalloc_test_defs.h"

cfghdrs_tup="include/jemalloc/jemalloc_defs.h:include/jemalloc/jemalloc_defs.h.in"
cfghdrs_tup="${cfghdrs_tup} include/jemalloc/internal/jemalloc_internal_defs.h:include/jemalloc/internal/jemalloc_internal_defs.h.in"
cfghdrs_tup="${cfghdrs_tup} test/include/test/jemalloc_test_defs.h:test/include/test/jemalloc_test_defs.h.in"

dnl ============================================================================
dnl jemalloc build options.
dnl

dnl Do not compile with debugging by default.
AC_ARG_ENABLE([debug],
  [AS_HELP_STRING([--enable-debug],
                  [Build debugging code])],
[if test "x$enable_debug" = "xno" ; then
  enable_debug="0"
else
  enable_debug="1"
fi
],
[enable_debug="0"]
)
if test "x$enable_debug" = "x1" ; then
  AC_DEFINE([JEMALLOC_DEBUG], [ ], [ ])
fi
AC_SUBST([enable_debug])

dnl Only optimize if not debugging.
if test "x$enable_debug" = "x0" ; then
  if test "x$GCC" = "xyes" ; then
    JE_CFLAGS_ADD([-O3])
    JE_CXXFLAGS_ADD([-O3])
    JE_CFLAGS_ADD([-funroll-loops])
  elif test "x$je_cv_msvc" = "xyes" ; then
    JE_CFLAGS_ADD([-O2])
    JE_CXXFLAGS_ADD([-O2])
  else
    JE_CFLAGS_ADD([-O])
    JE_CXXFLAGS_ADD([-O])
  fi
fi

dnl Enable statistics calculation by default.
AC_ARG_ENABLE([stats],
  [AS_HELP_STRING([--disable-stats],
                  [Disable statistics calculation/reporting])],
[if test "x$enable_stats" = "xno" ; then
  enable_stats="0"
else
  enable_stats="1"
fi
],
[enable_stats="1"]
)
if test "x$enable_stats" = "x1" ; then
  AC_DEFINE([JEMALLOC_STATS], [ ], [ ])
fi
AC_SUBST([enable_stats])

dnl Do not enable smallocx by default.
AC_ARG_ENABLE([experimental_smallocx],
  [AS_HELP_STRING([--enable-experimental-smallocx], [Enable experimental smallocx API])],
[if test "x$enable_experimental_smallocx" = "xno" ; then
enable_experimental_smallocx="0"
else
enable_experimental_smallocx="1"
fi
],
[enable_experimental_smallocx="0"]
)
if test "x$enable_experimental_smallocx" = "x1" ; then
  AC_DEFINE([JEMALLOC_EXPERIMENTAL_SMALLOCX_API], [ ], [ ])
fi
AC_SUBST([enable_experimental_smallocx])

dnl Do not enable profiling by default.
AC_ARG_ENABLE([prof],
  [AS_HELP_STRING([--enable-prof], [Enable allocation profiling])],
[if test "x$enable_prof" = "xno" ; then
  enable_prof="0"
else
  enable_prof="1"
fi
],
[enable_prof="0"]
)
if test "x$enable_prof" = "x1" ; then
  backtrace_method=""
else
  backtrace_method="N/A"
fi

AC_ARG_ENABLE([prof-libunwind],
  [AS_HELP_STRING([--enable-prof-libunwind], [Use libunwind for backtracing])],
[if test "x$enable_prof_libunwind" = "xno" ; then
  enable_prof_libunwind="0"
else
  enable_prof_libunwind="1"
  if test "x$enable_prof" = "x0" ; then
    AC_MSG_ERROR([--enable-prof-libunwind should only be used with --enable-prof])
  fi
fi
],
[enable_prof_libunwind="0"]
)
AC_ARG_WITH([static_libunwind],
  [AS_HELP_STRING([--with-static-libunwind=<libunwind.a>],
  [Path to static libunwind library; use rather than dynamically linking])],
if test "x$with_static_libunwind" = "xno" ; then
  LUNWIND="-lunwind"
else
  if test ! -f "$with_static_libunwind" ; then
    AC_MSG_ERROR([Static libunwind not found: $with_static_libunwind])
  fi
  LUNWIND="$with_static_libunwind"
fi,
  LUNWIND="-lunwind"
)
if test "x$backtrace_method" = "x" -a "x$enable_prof_libunwind" = "x1" ; then
  AC_CHECK_HEADERS([libunwind.h], , [enable_prof_libunwind="0"])
  if test "x$LUNWIND" = "x-lunwind" ; then
    AC_CHECK_LIB([unwind], [unw_backtrace], [JE_APPEND_VS(LIBS, $LUNWIND)],
                 [enable_prof_libunwind="0"])
  else
    JE_APPEND_VS(LIBS, $LUNWIND)
  fi
  if test "x${enable_prof_libunwind}" = "x1" ; then
    backtrace_method="libunwind"
    AC_DEFINE([JEMALLOC_PROF_LIBUNWIND], [ ], [ ])
  fi
fi

AC_ARG_ENABLE([prof-libgcc],
  [AS_HELP_STRING([--disable-prof-libgcc],
  [Do not use libgcc for backtracing])],
[if test "x$enable_prof_libgcc" = "xno" ; then
  enable_prof_libgcc="0"
else
  enable_prof_libgcc="1"
fi
],
[enable_prof_libgcc="1"]
)
if test "x$backtrace_method" = "x" -a "x$enable_prof_libgcc" = "x1" \
     -a "x$GCC" = "xyes" ; then
  AC_CHECK_HEADERS([unwind.h], , [enable_prof_libgcc="0"])
  if test "x${enable_prof_libgcc}" = "x1" ; then
    AC_CHECK_LIB([gcc], [_Unwind_Backtrace], [JE_APPEND_VS(LIBS, -lgcc)], [enable_prof_libgcc="0"])
  fi
  if test "x${enable_prof_libgcc}" = "x1" ; then
    backtrace_method="libgcc"
    AC_DEFINE([JEMALLOC_PROF_LIBGCC], [ ], [ ])
  fi
else
  enable_prof_libgcc="0"
fi

AC_ARG_ENABLE([prof-gcc],
  [AS_HELP_STRING([--disable-prof-gcc],
  [Do not use gcc intrinsics for backtracing])],
[if test "x$enable_prof_gcc" = "xno" ; then
  enable_prof_gcc="0"
else
  enable_prof_gcc="1"
fi
],
[enable_prof_gcc="1"]
)
if test "x$backtrace_method" = "x" -a "x$enable_prof_gcc" = "x1" \
     -a "x$GCC" = "xyes" ; then
  JE_CFLAGS_ADD([-fno-omit-frame-pointer])
  backtrace_method="gcc intrinsics"
  AC_DEFINE([JEMALLOC_PROF_GCC], [ ], [ ])
else
  enable_prof_gcc="0"
fi

if test "x$backtrace_method" = "x" ; then
  backtrace_method="none (disabling profiling)"
  enable_prof="0"
fi
AC_MSG_CHECKING([configured backtracing method])
AC_MSG_RESULT([$backtrace_method])
if test "x$enable_prof" = "x1" ; then
  dnl Heap profiling uses the log(3) function.
  JE_APPEND_VS(LIBS, $LM)

  AC_DEFINE([JEMALLOC_PROF], [ ], [ ])
fi
AC_SUBST([enable_prof])

dnl Indicate whether adjacent virtual memory mappings automatically coalesce
dnl (and fragment on demand).
if test "x${maps_coalesce}" = "x1" ; then
  AC_DEFINE([JEMALLOC_MAPS_COALESCE], [ ], [ ])
fi

dnl Indicate whether to retain memory (rather than using munmap()) by default.
if test "x$default_retain" = "x1" ; then
  AC_DEFINE([JEMALLOC_RETAIN], [ ], [ ])
fi

dnl Indicate whether realloc(ptr, 0) defaults to the "alloc" behavior.
if test "x$zero_realloc_default_free" = "x1" ; then
  AC_DEFINE([JEMALLOC_ZERO_REALLOC_DEFAULT_FREE], [ ], [ ])
fi

dnl Enable allocation from DSS if supported by the OS.
have_dss="1"
dnl Check whether the BSD/SUSv1 sbrk() exists.  If not, disable DSS support.
AC_CHECK_FUNC([sbrk], [have_sbrk="1"], [have_sbrk="0"])
if test "x$have_sbrk" = "x1" ; then
  if test "x$sbrk_deprecated" = "x1" ; then
    AC_MSG_RESULT([Disabling dss allocation because sbrk is deprecated])
    have_dss="0"
  fi
else
  have_dss="0"
fi

if test "x$have_dss" = "x1" ; then
  AC_DEFINE([JEMALLOC_DSS], [ ], [ ])
fi

dnl Support the junk/zero filling option by default.
AC_ARG_ENABLE([fill],
  [AS_HELP_STRING([--disable-fill], [Disable support for junk/zero filling])],
[if test "x$enable_fill" = "xno" ; then
  enable_fill="0"
else
  enable_fill="1"
fi
],
[enable_fill="1"]
)
if test "x$enable_fill" = "x1" ; then
  AC_DEFINE([JEMALLOC_FILL], [ ], [ ])
fi
AC_SUBST([enable_fill])

dnl Disable utrace(2)-based tracing by default.
AC_ARG_ENABLE([utrace],
  [AS_HELP_STRING([--enable-utrace], [Enable utrace(2)-based tracing])],
[if test "x$enable_utrace" = "xno" ; then
  enable_utrace="0"
else
  enable_utrace="1"
fi
],
[enable_utrace="0"]
)
JE_COMPILABLE([utrace(2)], [
#include <sys/types.h>
#include <sys/param.h>
#include <sys/time.h>
#include <sys/uio.h>
#include <sys/ktrace.h>
], [
	utrace((void *)0, 0);
], [je_cv_utrace])
if test "x${je_cv_utrace}" = "xno" ; then
  JE_COMPILABLE([utrace(2) with label], [
  #include <sys/types.h>
  #include <sys/param.h>
  #include <sys/time.h>
  #include <sys/uio.h>
  #include <sys/ktrace.h>
  ], [
	  utrace((void *)0, (void *)0, 0);
  ], [je_cv_utrace_label])
  if test "x${je_cv_utrace_label}" = "xno"; then
    enable_utrace="0"
  fi
  if test "x$enable_utrace" = "x1" ; then
    AC_DEFINE([JEMALLOC_UTRACE_LABEL], [ ], [ ])
  fi
else
  if test "x$enable_utrace" = "x1" ; then
    AC_DEFINE([JEMALLOC_UTRACE], [ ], [ ])
  fi
fi
AC_SUBST([enable_utrace])

dnl Do not support the xmalloc option by default.
AC_ARG_ENABLE([xmalloc],
  [AS_HELP_STRING([--enable-xmalloc], [Support xmalloc option])],
[if test "x$enable_xmalloc" = "xno" ; then
  enable_xmalloc="0"
else
  enable_xmalloc="1"
fi
],
[enable_xmalloc="0"]
)
if test "x$enable_xmalloc" = "x1" ; then
  AC_DEFINE([JEMALLOC_XMALLOC], [ ], [ ])
fi
AC_SUBST([enable_xmalloc])

dnl Support cache-oblivious allocation alignment by default.
AC_ARG_ENABLE([cache-oblivious],
  [AS_HELP_STRING([--disable-cache-oblivious],
                  [Disable support for cache-oblivious allocation alignment])],
[if test "x$enable_cache_oblivious" = "xno" ; then
  enable_cache_oblivious="0"
else
  enable_cache_oblivious="1"
fi
],
[enable_cache_oblivious="1"]
)
if test "x$enable_cache_oblivious" = "x1" ; then
  AC_DEFINE([JEMALLOC_CACHE_OBLIVIOUS], [ ], [ ])
fi
AC_SUBST([enable_cache_oblivious])

dnl Do not log by default.
AC_ARG_ENABLE([log],
  [AS_HELP_STRING([--enable-log], [Support debug logging])],
[if test "x$enable_log" = "xno" ; then
  enable_log="0"
else
  enable_log="1"
fi
],
[enable_log="0"]
)
if test "x$enable_log" = "x1" ; then
  AC_DEFINE([JEMALLOC_LOG], [ ], [ ])
fi
AC_SUBST([enable_log])

dnl Do not use readlinkat by default
AC_ARG_ENABLE([readlinkat],
  [AS_HELP_STRING([--enable-readlinkat], [Use readlinkat over readlink])],
[if test "x$enable_readlinkat" = "xno" ; then
  enable_readlinkat="0"
else
  enable_readlinkat="1"
fi
],
[enable_readlinkat="0"]
)
if test "x$enable_readlinkat" = "x1" ; then
  AC_DEFINE([JEMALLOC_READLINKAT], [ ], [ ])
fi
AC_SUBST([enable_readlinkat])

dnl Avoid extra safety checks by default
AC_ARG_ENABLE([opt-safety-checks],
  [AS_HELP_STRING([--enable-opt-safety-checks],
  [Perform certain low-overhead checks, even in opt mode])],
[if test "x$enable_opt_safety_checks" = "xno" ; then
  enable_opt_safety_checks="0"
else
  enable_opt_safety_checks="1"
fi
],
[enable_opt_safety_checks="0"]
)
if test "x$enable_opt_safety_checks" = "x1" ; then
  AC_DEFINE([JEMALLOC_OPT_SAFETY_CHECKS], [ ], [ ])
fi
AC_SUBST([enable_opt_safety_checks])

dnl Look for sized-deallocation bugs while otherwise being in opt mode.
AC_ARG_ENABLE([opt-size-checks],
  [AS_HELP_STRING([--enable-opt-size-checks],
  [Perform sized-deallocation argument checks, even in opt mode])],
[if test "x$enable_opt_size_checks" = "xno" ; then
  enable_opt_size_checks="0"
else
  enable_opt_size_checks="1"
fi
],
[enable_opt_size_checks="0"]
)
if test "x$enable_opt_size_checks" = "x1" ; then
  AC_DEFINE([JEMALLOC_OPT_SIZE_CHECKS], [ ], [ ])
fi
AC_SUBST([enable_opt_size_checks])

dnl Do not check for use-after-free by default.
AC_ARG_ENABLE([uaf-detection],
  [AS_HELP_STRING([--enable-uaf-detection],
  [Allow sampled junk-filling on deallocation to detect use-after-free])],
[if test "x$enable_uaf_detection" = "xno" ; then
  enable_uaf_detection="0"
else
  enable_uaf_detection="1"
fi
],
[enable_uaf_detection="0"]
)
if test "x$enable_uaf_detection" = "x1" ; then
  AC_DEFINE([JEMALLOC_UAF_DETECTION], [ ])
fi
AC_SUBST([enable_uaf_detection])

JE_COMPILABLE([a program using __builtin_unreachable], [
void foo (void) {
  __builtin_unreachable();
}
], [
	{
		foo();
	}
], [je_cv_gcc_builtin_unreachable])
if test "x${je_cv_gcc_builtin_unreachable}" = "xyes" ; then
  AC_DEFINE([JEMALLOC_INTERNAL_UNREACHABLE], [__builtin_unreachable], [ ])
else
  AC_DEFINE([JEMALLOC_INTERNAL_UNREACHABLE], [abort], [ ])
fi

dnl ============================================================================
dnl Check for  __builtin_ffsl(), then ffsl(3), and fail if neither are found.
dnl One of those two functions should (theoretically) exist on all platforms
dnl that jemalloc currently has a chance of functioning on without modification.
dnl We additionally assume ffs[ll]() or __builtin_ffs[ll]() are defined if
dnl ffsl() or __builtin_ffsl() are defined, respectively.
JE_COMPILABLE([a program using __builtin_ffsl], [
#include <stdio.h>
#include <strings.h>
#include <string.h>
], [
	{
		int rv = __builtin_ffsl(0x08);
		printf("%d\n", rv);
	}
], [je_cv_gcc_builtin_ffsl])
if test "x${je_cv_gcc_builtin_ffsl}" = "xyes" ; then
  AC_DEFINE([JEMALLOC_INTERNAL_FFSLL], [__builtin_ffsll], [ ])
  AC_DEFINE([JEMALLOC_INTERNAL_FFSL], [__builtin_ffsl], [ ])
  AC_DEFINE([JEMALLOC_INTERNAL_FFS], [__builtin_ffs], [ ])
else
  JE_COMPILABLE([a program using ffsl], [
  #include <stdio.h>
  #include <strings.h>
  #include <string.h>
  ], [
	{
		int rv = ffsl(0x08);
		printf("%d\n", rv);
	}
  ], [je_cv_function_ffsl])
  if test "x${je_cv_function_ffsl}" = "xyes" ; then
    AC_DEFINE([JEMALLOC_INTERNAL_FFSLL], [ffsll], [ ])
    AC_DEFINE([JEMALLOC_INTERNAL_FFSL], [ffsl], [ ])
    AC_DEFINE([JEMALLOC_INTERNAL_FFS], [ffs], [ ])
  else
    AC_MSG_ERROR([Cannot build without ffsl(3) or __builtin_ffsl()])
  fi
fi

JE_COMPILABLE([a program using __builtin_popcountl], [
#include <stdio.h>
#include <strings.h>
#include <string.h>
], [
	{
		int rv = __builtin_popcountl(0x08);
		printf("%d\n", rv);
	}
], [je_cv_gcc_builtin_popcountl])
if test "x${je_cv_gcc_builtin_popcountl}" = "xyes" ; then
  AC_DEFINE([JEMALLOC_INTERNAL_POPCOUNT], [__builtin_popcount], [ ])
  AC_DEFINE([JEMALLOC_INTERNAL_POPCOUNTL], [__builtin_popcountl], [ ])
  AC_DEFINE([JEMALLOC_INTERNAL_POPCOUNTLL], [__builtin_popcountll], [ ])
fi

AC_ARG_WITH([lg_quantum],
  [AS_HELP_STRING([--with-lg-quantum=<lg-quantum>],
   [Base 2 log of minimum allocation alignment])])
if test "x$with_lg_quantum" != "x" ; then
  AC_DEFINE_UNQUOTED([LG_QUANTUM], [$with_lg_quantum], [ ])
fi

AC_ARG_WITH([lg_slab_maxregs],
  [AS_HELP_STRING([--with-lg-slab-maxregs=<lg-slab-maxregs>],
   [Base 2 log of maximum number of regions in a slab (used with malloc_conf slab_sizes)])],
  [CONFIG_LG_SLAB_MAXREGS="with_lg_slab_maxregs"],
  [CONFIG_LG_SLAB_MAXREGS=""])
if test "x$with_lg_slab_maxregs" != "x" ; then
  AC_DEFINE_UNQUOTED([CONFIG_LG_SLAB_MAXREGS], [$with_lg_slab_maxregs], [ ])
fi

AC_ARG_WITH([lg_page],
  [AS_HELP_STRING([--with-lg-page=<lg-page>], [Base 2 log of system page size])],
  [LG_PAGE="$with_lg_page"], [LG_PAGE="detect"])
case "${host}" in
  aarch64-apple-darwin*)
      dnl When cross-compile for Apple M1 and no page size specified, use the
      dnl default and skip detecting the page size (which is likely incorrect).
      if test "x${host}" != "x${build}" -a "x$LG_PAGE" = "xdetect"; then
        LG_PAGE=14
      fi
      ;;
esac
if test "x$LG_PAGE" = "xdetect"; then
  AC_CACHE_CHECK([LG_PAGE],
               [je_cv_lg_page],
               AC_RUN_IFELSE([AC_LANG_PROGRAM(
[[
#include <strings.h>
#ifdef _WIN32
#include <windows.h>
#else
#include <unistd.h>
#endif
#include <stdio.h>
]],
[[
    int result;
    FILE *f;

#ifdef _WIN32
    SYSTEM_INFO si;
    GetSystemInfo(&si);
    result = si.dwPageSize;
#else
    result = sysconf(_SC_PAGESIZE);
#endif
    if (result == -1) {
	return 1;
    }
    result = JEMALLOC_INTERNAL_FFSL(result) - 1;

    f = fopen("conftest.out", "w");
    if (f == NULL) {
	return 1;
    }
    fprintf(f, "%d", result);
    fclose(f);

    return 0;
]])],
                             [je_cv_lg_page=`cat conftest.out`],
                             [je_cv_lg_page=undefined],
                             [je_cv_lg_page=12]))
fi
if test "x${je_cv_lg_page}" != "x" ; then
  LG_PAGE="${je_cv_lg_page}"
fi
if test "x${LG_PAGE}" != "xundefined" ; then
   AC_DEFINE_UNQUOTED([LG_PAGE], [$LG_PAGE], [ ])
else
   AC_MSG_ERROR([cannot determine value for LG_PAGE])
fi

AC_ARG_WITH([lg_hugepage],
  [AS_HELP_STRING([--with-lg-hugepage=<lg-hugepage>],
   [Base 2 log of system huge page size])],
  [je_cv_lg_hugepage="${with_lg_hugepage}"],
  [je_cv_lg_hugepage=""])
if test "x${je_cv_lg_hugepage}" = "x" ; then
  dnl Look in /proc/meminfo (Linux-specific) for information on the default huge
  dnl page size, if any.  The relevant line looks like:
  dnl
  dnl   Hugepagesize:       2048 kB
  if test -e "/proc/meminfo" ; then
    hpsk=[`cat /proc/meminfo 2>/dev/null | \
          grep -e '^Hugepagesize:[[:space:]]\+[0-9]\+[[:space:]]kB$' | \
          awk '{print $2}'`]
    if test "x${hpsk}" != "x" ; then
      je_cv_lg_hugepage=10
      while test "${hpsk}" -gt 1 ; do
        hpsk="$((hpsk / 2))"
        je_cv_lg_hugepage="$((je_cv_lg_hugepage + 1))"
      done
    fi
  fi

  dnl Set default if unable to automatically configure.
  if test "x${je_cv_lg_hugepage}" = "x" ; then
    je_cv_lg_hugepage=21
  fi
fi
if test "x${LG_PAGE}" != "xundefined" -a \
        "${je_cv_lg_hugepage}" -lt "${LG_PAGE}" ; then
  AC_MSG_ERROR([Huge page size (2^${je_cv_lg_hugepage}) must be at least page size (2^${LG_PAGE})])
fi
AC_DEFINE_UNQUOTED([LG_HUGEPAGE], [${je_cv_lg_hugepage}], [ ])

dnl ============================================================================
dnl Enable libdl by default.
AC_ARG_ENABLE([libdl],
  [AS_HELP_STRING([--disable-libdl],
  [Do not use libdl])],
[if test "x$enable_libdl" = "xno" ; then
  enable_libdl="0"
else
  enable_libdl="1"
fi
],
[enable_libdl="1"]
)
AC_SUBST([libdl])

dnl ============================================================================
dnl Configure pthreads.

if test "x$abi" != "xpecoff" ; then
  AC_DEFINE([JEMALLOC_HAVE_PTHREAD], [ ], [ ])
  AC_CHECK_HEADERS([pthread.h], , [AC_MSG_ERROR([pthread.h is missing])])
  dnl Some systems may embed pthreads functionality in libc; check for libpthread
  dnl first, but try libc too before failing.
  AC_CHECK_LIB([pthread], [pthread_create], [JE_APPEND_VS(LIBS, -pthread)],
               [AC_SEARCH_LIBS([pthread_create], , ,
                               AC_MSG_ERROR([libpthread is missing]))])
  wrap_syms="${wrap_syms} pthread_create"
  have_pthread="1"

dnl Check if we have dlsym support.
  if test "x$enable_libdl" = "x1" ; then
    have_dlsym="1"
    AC_CHECK_HEADERS([dlfcn.h],
      AC_CHECK_FUNC([dlsym], [],
        [AC_CHECK_LIB([dl], [dlsym], [LIBS="$LIBS -ldl"], [have_dlsym="0"])]),
      [have_dlsym="0"])
    if test "x$have_dlsym" = "x1" ; then
      AC_DEFINE([JEMALLOC_HAVE_DLSYM], [ ], [ ])
    fi
  else
    have_dlsym="0"
  fi

  JE_COMPILABLE([pthread_atfork(3)], [
#include <pthread.h>
], [
  pthread_atfork((void *)0, (void *)0, (void *)0);
], [je_cv_pthread_atfork])
  if test "x${je_cv_pthread_atfork}" = "xyes" ; then
    AC_DEFINE([JEMALLOC_HAVE_PTHREAD_ATFORK], [ ], [ ])
  fi
  dnl Check if pthread_setname_np is available with the expected API.
  JE_COMPILABLE([pthread_setname_np(3)], [
#include <pthread.h>
], [
  pthread_setname_np(pthread_self(), "setname_test");
], [je_cv_pthread_setname_np])
  if test "x${je_cv_pthread_setname_np}" = "xyes" ; then
    AC_DEFINE([JEMALLOC_HAVE_PTHREAD_SETNAME_NP], [ ], [ ])
  fi
  dnl Check if pthread_getname_np is not necessarily present despite
  dnl the pthread_setname_np counterpart
  JE_COMPILABLE([pthread_getname_np(3)], [
#include <pthread.h>
#include <stdlib.h>
], [
  {
  	char *name = malloc(16);
  	pthread_getname_np(pthread_self(), name, 16);
	free(name);
  }
], [je_cv_pthread_getname_np])
  if test "x${je_cv_pthread_getname_np}" = "xyes" ; then
    AC_DEFINE([JEMALLOC_HAVE_PTHREAD_GETNAME_NP], [ ], [ ])
  fi
  dnl Check if pthread_get_name_np is not necessarily present despite
  dnl the pthread_set_name_np counterpart
  JE_COMPILABLE([pthread_get_name_np(3)], [
#include <pthread.h>
#include <pthread_np.h>
#include <stdlib.h>
], [
  {
  	char *name = malloc(16);
  	pthread_get_name_np(pthread_self(), name, 16);
	free(name);
  }
], [je_cv_pthread_get_name_np])
  if test "x${je_cv_pthread_get_name_np}" = "xyes" ; then
    AC_DEFINE([JEMALLOC_HAVE_PTHREAD_GET_NAME_NP], [ ], [ ])
  fi
fi

JE_APPEND_VS(CPPFLAGS, -D_REENTRANT)

dnl Check whether clock_gettime(2) is in libc or librt.
AC_SEARCH_LIBS([clock_gettime], [rt])

dnl Cray wrapper compiler often adds `-lrt` when using `-static`. Check with
dnl `-dynamic` as well in case a user tries to dynamically link in jemalloc
if test "x$je_cv_cray_prgenv_wrapper" = "xyes" ; then
  if test "$ac_cv_search_clock_gettime" != "-lrt"; then
    JE_CFLAGS_SAVE()

    unset ac_cv_search_clock_gettime
    JE_CFLAGS_ADD([-dynamic])
    AC_SEARCH_LIBS([clock_gettime], [rt])

    JE_CFLAGS_RESTORE()
  fi
fi

dnl check for CLOCK_MONOTONIC_COARSE (Linux-specific).
JE_COMPILABLE([clock_gettime(CLOCK_MONOTONIC_COARSE, ...)], [
#include <time.h>
], [
	struct timespec ts;

	clock_gettime(CLOCK_MONOTONIC_COARSE, &ts);
], [je_cv_clock_monotonic_coarse])
if test "x${je_cv_clock_monotonic_coarse}" = "xyes" ; then
  AC_DEFINE([JEMALLOC_HAVE_CLOCK_MONOTONIC_COARSE], [ ], [ ])
fi

dnl check for CLOCK_MONOTONIC.
JE_COMPILABLE([clock_gettime(CLOCK_MONOTONIC, ...)], [
#include <unistd.h>
#include <time.h>
], [
	struct timespec ts;

	clock_gettime(CLOCK_MONOTONIC, &ts);
#if !defined(_POSIX_MONOTONIC_CLOCK) || _POSIX_MONOTONIC_CLOCK < 0
#  error _POSIX_MONOTONIC_CLOCK missing/invalid
#endif
], [je_cv_clock_monotonic])
if test "x${je_cv_clock_monotonic}" = "xyes" ; then
  AC_DEFINE([JEMALLOC_HAVE_CLOCK_MONOTONIC], [ ], [ ])
fi

dnl Check for mach_absolute_time().
JE_COMPILABLE([mach_absolute_time()], [
#include <mach/mach_time.h>
], [
	mach_absolute_time();
], [je_cv_mach_absolute_time])
if test "x${je_cv_mach_absolute_time}" = "xyes" ; then
  AC_DEFINE([JEMALLOC_HAVE_MACH_ABSOLUTE_TIME], [ ], [ ])
fi

dnl check for CLOCK_REALTIME (always should be available on Linux)
JE_COMPILABLE([clock_gettime(CLOCK_REALTIME, ...)], [
#include <time.h>
], [
	struct timespec ts;

	clock_gettime(CLOCK_REALTIME, &ts);
], [je_cv_clock_realtime])
if test "x${je_cv_clock_realtime}" = "xyes" ; then
  AC_DEFINE([JEMALLOC_HAVE_CLOCK_REALTIME], [ ], [ ])
fi

dnl Use syscall(2) (if available) by default.
AC_ARG_ENABLE([syscall],
  [AS_HELP_STRING([--disable-syscall], [Disable use of syscall(2)])],
[if test "x$enable_syscall" = "xno" ; then
  enable_syscall="0"
else
  enable_syscall="1"
fi
],
[enable_syscall="1"]
)
if test "x$enable_syscall" = "x1" ; then
  dnl Check if syscall(2) is usable.  Treat warnings as errors, so that e.g. OS
  dnl X 10.12's deprecation warning prevents use.
  JE_CFLAGS_SAVE()
  JE_CFLAGS_ADD([-Werror])
  JE_COMPILABLE([syscall(2)], [
#include <sys/syscall.h>
#include <unistd.h>
], [
	syscall(SYS_write, 2, "hello", 5);
],
                [je_cv_syscall])
  JE_CFLAGS_RESTORE()
  if test "x$je_cv_syscall" = "xyes" ; then
    AC_DEFINE([JEMALLOC_USE_SYSCALL], [ ], [ ])
  fi
fi

dnl Check if the GNU-specific secure_getenv function exists.
AC_CHECK_FUNC([secure_getenv],
              [have_secure_getenv="1"],
              [have_secure_getenv="0"]
             )
if test "x$have_secure_getenv" = "x1" ; then
  AC_DEFINE([JEMALLOC_HAVE_SECURE_GETENV], [ ], [ ])
fi

dnl Check if the GNU-specific sched_getcpu function exists.
AC_CHECK_FUNC([sched_getcpu],
              [have_sched_getcpu="1"],
              [have_sched_getcpu="0"]
             )
if test "x$have_sched_getcpu" = "x1" ; then
  AC_DEFINE([JEMALLOC_HAVE_SCHED_GETCPU], [ ], [ ])
fi

dnl Check if the GNU-specific sched_setaffinity function exists.
AC_CHECK_FUNC([sched_setaffinity],
              [have_sched_setaffinity="1"],
              [have_sched_setaffinity="0"]
             )
if test "x$have_sched_setaffinity" = "x1" ; then
  AC_DEFINE([JEMALLOC_HAVE_SCHED_SETAFFINITY], [ ], [ ])
fi

dnl Check if the Solaris/BSD issetugid function exists.
AC_CHECK_FUNC([issetugid],
              [have_issetugid="1"],
              [have_issetugid="0"]
             )
if test "x$have_issetugid" = "x1" ; then
  AC_DEFINE([JEMALLOC_HAVE_ISSETUGID], [ ], [ ])
fi

dnl Check whether the BSD-specific _malloc_thread_cleanup() exists.  If so, use
dnl it rather than pthreads TSD cleanup functions to support cleanup during
dnl thread exit, in order to avoid pthreads library recursion during
dnl bootstrapping.
AC_CHECK_FUNC([_malloc_thread_cleanup],
              [have__malloc_thread_cleanup="1"],
              [have__malloc_thread_cleanup="0"]
             )
if test "x$have__malloc_thread_cleanup" = "x1" ; then
  AC_DEFINE([JEMALLOC_MALLOC_THREAD_CLEANUP], [ ], [ ])
  wrap_syms="${wrap_syms} _malloc_thread_cleanup _malloc_tsd_cleanup_register"
  force_tls="1"
fi

dnl Check whether the BSD-specific _pthread_mutex_init_calloc_cb() exists.  If
dnl so, mutex initialization causes allocation, and we need to implement this
dnl callback function in order to prevent recursive allocation.
AC_CHECK_FUNC([_pthread_mutex_init_calloc_cb],
              [have__pthread_mutex_init_calloc_cb="1"],
              [have__pthread_mutex_init_calloc_cb="0"]
             )
if test "x$have__pthread_mutex_init_calloc_cb" = "x1" ; then
  AC_DEFINE([JEMALLOC_MUTEX_INIT_CB], [ ], [ ])
  wrap_syms="${wrap_syms} _malloc_prefork _malloc_postfork"
fi

AC_CHECK_FUNC([memcntl],
	      [have_memcntl="1"],
	      [have_memcntl="0"],
	      )
if test "x$have_memcntl" = "x1" ; then
  AC_DEFINE([JEMALLOC_HAVE_MEMCNTL], [ ], [ ])
fi

dnl Disable lazy locking by default.
AC_ARG_ENABLE([lazy_lock],
  [AS_HELP_STRING([--enable-lazy-lock],
  [Enable lazy locking (only lock when multi-threaded)])],
[if test "x$enable_lazy_lock" = "xno" ; then
  enable_lazy_lock="0"
else
  enable_lazy_lock="1"
fi
],
[enable_lazy_lock=""]
)
if test "x${enable_lazy_lock}" = "x" ; then
  if test "x${force_lazy_lock}" = "x1" ; then
    AC_MSG_RESULT([Forcing lazy-lock to avoid allocator/threading bootstrap issues])
    enable_lazy_lock="1"
  else
    enable_lazy_lock="0"
  fi
fi
if test "x${enable_lazy_lock}" = "x1" -a "x${abi}" = "xpecoff" ; then
  AC_MSG_RESULT([Forcing no lazy-lock because thread creation monitoring is unimplemented])
  enable_lazy_lock="0"
fi
if test "x$enable_lazy_lock" = "x1" ; then
  if test "x$have_dlsym" = "x1" ; then
    AC_DEFINE([JEMALLOC_LAZY_LOCK], [ ], [ ])
  else
    AC_MSG_ERROR([Missing dlsym support: lazy-lock cannot be enabled.])
  fi
fi
AC_SUBST([enable_lazy_lock])

dnl Automatically configure TLS.
if test "x${force_tls}" = "x1" ; then
  enable_tls="1"
elif test "x${force_tls}" = "x0" ; then
  enable_tls="0"
else
  enable_tls="1"
fi
if test "x${enable_tls}" = "x1" ; then
AC_MSG_CHECKING([for TLS])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
[[
    __thread int x;
]], [[
    x = 42;

    return 0;
]])],
              AC_MSG_RESULT([yes]),
              AC_MSG_RESULT([no])
              enable_tls="0")
else
  enable_tls="0"
fi
AC_SUBST([enable_tls])
if test "x${enable_tls}" = "x1" ; then
  AC_DEFINE_UNQUOTED([JEMALLOC_TLS], [ ], [ ])
fi

dnl ============================================================================
dnl Check for C11 atomics.

JE_COMPILABLE([C11 atomics], [
#include <stdint.h>
#if (__STDC_VERSION__ >= 201112L) && !defined(__STDC_NO_ATOMICS__)
#include <stdatomic.h>
#else
#error Atomics not available
#endif
], [
    uint64_t *p = (uint64_t *)0;
    uint64_t x = 1;
    volatile atomic_uint_least64_t *a = (volatile atomic_uint_least64_t *)p;
    uint64_t r = atomic_fetch_add(a, x) + x;
    return r == 0;
], [je_cv_c11_atomics])
if test "x${je_cv_c11_atomics}" = "xyes" ; then
  AC_DEFINE([JEMALLOC_C11_ATOMICS], [ ], [ ])
fi

dnl ============================================================================
dnl Check for GCC-style __atomic atomics.

JE_COMPILABLE([GCC __atomic atomics], [
], [
    int x = 0;
    int val = 1;
    int y = __atomic_fetch_add(&x, val, __ATOMIC_RELAXED);
    int after_add = x;
    return after_add == 1;
], [je_cv_gcc_atomic_atomics])
if test "x${je_cv_gcc_atomic_atomics}" = "xyes" ; then
  AC_DEFINE([JEMALLOC_GCC_ATOMIC_ATOMICS], [ ], [ ])

  dnl check for 8-bit atomic support
  JE_COMPILABLE([GCC 8-bit __atomic atomics], [
  ], [
      unsigned char x = 0;
      int val = 1;
      int y = __atomic_fetch_add(&x, val, __ATOMIC_RELAXED);
      int after_add = (int)x;
      return after_add == 1;
  ], [je_cv_gcc_u8_atomic_atomics])
  if test "x${je_cv_gcc_u8_atomic_atomics}" = "xyes" ; then
    AC_DEFINE([JEMALLOC_GCC_U8_ATOMIC_ATOMICS], [ ], [ ])
  fi
fi

dnl ============================================================================
dnl Check for GCC-style __sync atomics.

JE_COMPILABLE([GCC __sync atomics], [
], [
    int x = 0;
    int before_add = __sync_fetch_and_add(&x, 1);
    int after_add = x;
    return (before_add == 0) && (after_add == 1);
], [je_cv_gcc_sync_atomics])
if test "x${je_cv_gcc_sync_atomics}" = "xyes" ; then
  AC_DEFINE([JEMALLOC_GCC_SYNC_ATOMICS], [ ], [ ])

  dnl check for 8-bit atomic support
  JE_COMPILABLE([GCC 8-bit __sync atomics], [
  ], [
      unsigned char x = 0;
      int before_add = __sync_fetch_and_add(&x, 1);
      int after_add = (int)x;
      return (before_add == 0) && (after_add == 1);
  ], [je_cv_gcc_u8_sync_atomics])
  if test "x${je_cv_gcc_u8_sync_atomics}" = "xyes" ; then
    AC_DEFINE([JEMALLOC_GCC_U8_SYNC_ATOMICS], [ ], [ ])
  fi
fi

dnl ============================================================================
dnl Check for atomic(3) operations as provided on Darwin.
dnl We need this not for the atomic operations (which are provided above), but
dnl rather for the OS_unfair_lock type it exposes.

JE_COMPILABLE([Darwin OSAtomic*()], [
#include <libkern/OSAtomic.h>
#include <inttypes.h>
], [
	{
		int32_t x32 = 0;
		volatile int32_t *x32p = &x32;
		OSAtomicAdd32(1, x32p);
	}
	{
		int64_t x64 = 0;
		volatile int64_t *x64p = &x64;
		OSAtomicAdd64(1, x64p);
	}
], [je_cv_osatomic])
if test "x${je_cv_osatomic}" = "xyes" ; then
  AC_DEFINE([JEMALLOC_OSATOMIC], [ ], [ ])
fi

dnl ============================================================================
dnl Check for madvise(2).

JE_COMPILABLE([madvise(2)], [
#include <sys/mman.h>
], [
	madvise((void *)0, 0, 0);
], [je_cv_madvise])
if test "x${je_cv_madvise}" = "xyes" ; then
  AC_DEFINE([JEMALLOC_HAVE_MADVISE], [ ], [ ])

  dnl Check for madvise(..., MADV_FREE).
  JE_COMPILABLE([madvise(..., MADV_FREE)], [
#include <sys/mman.h>
], [
	madvise((void *)0, 0, MADV_FREE);
], [je_cv_madv_free])
  if test "x${je_cv_madv_free}" = "xyes" ; then
    AC_DEFINE([JEMALLOC_PURGE_MADVISE_FREE], [ ], [ ])
  elif test "x${je_cv_madvise}" = "xyes" ; then
    case "${host_cpu}" in i686|x86_64)
        case "${host}" in *-*-linux*)
            AC_DEFINE([JEMALLOC_PURGE_MADVISE_FREE], [ ], [ ])
            AC_DEFINE([JEMALLOC_DEFINE_MADVISE_FREE], [ ], [ ])
	    ;;
        esac
        ;;
    esac
  fi

  dnl Check for madvise(..., MADV_DONTNEED).
  JE_COMPILABLE([madvise(..., MADV_DONTNEED)], [
#include <sys/mman.h>
], [
	madvise((void *)0, 0, MADV_DONTNEED);
], [je_cv_madv_dontneed])
  if test "x${je_cv_madv_dontneed}" = "xyes" ; then
    AC_DEFINE([JEMALLOC_PURGE_MADVISE_DONTNEED], [ ], [ ])
  fi

  dnl Check for madvise(..., MADV_DO[NT]DUMP).
  JE_COMPILABLE([madvise(..., MADV_DO[[NT]]DUMP)], [
#include <sys/mman.h>
], [
	madvise((void *)0, 0, MADV_DONTDUMP);
	madvise((void *)0, 0, MADV_DODUMP);
], [je_cv_madv_dontdump])
  if test "x${je_cv_madv_dontdump}" = "xyes" ; then
    AC_DEFINE([JEMALLOC_MADVISE_DONTDUMP], [ ], [ ])
  fi

  dnl Check for madvise(..., MADV_[NO]HUGEPAGE).
  JE_COMPILABLE([madvise(..., MADV_[[NO]]HUGEPAGE)], [
#include <sys/mman.h>
], [
	madvise((void *)0, 0, MADV_HUGEPAGE);
	madvise((void *)0, 0, MADV_NOHUGEPAGE);
], [je_cv_thp])
  dnl Check for madvise(..., MADV_[NO]CORE).
  JE_COMPILABLE([madvise(..., MADV_[[NO]]CORE)], [
#include <sys/mman.h>
], [
	madvise((void *)0, 0, MADV_NOCORE);
	madvise((void *)0, 0, MADV_CORE);
], [je_cv_madv_nocore])
  if test "x${je_cv_madv_nocore}" = "xyes" ; then
    AC_DEFINE([JEMALLOC_MADVISE_NOCORE], [ ], [ ])
  fi
case "${host_cpu}" in
  arm*)
    ;;
  *)
  if test "x${je_cv_thp}" = "xyes" ; then
    AC_DEFINE([JEMALLOC_HAVE_MADVISE_HUGE], [ ], [ ])
  fi
  ;;
esac
else
  dnl Check for posix_madvise.
  JE_COMPILABLE([posix_madvise], [
  #include <sys/mman.h>
  ], [
    posix_madvise((void *)0, 0, 0);
  ], [je_cv_posix_madvise])
  if test "x${je_cv_posix_madvise}" = "xyes" ; then
    AC_DEFINE([JEMALLOC_HAVE_POSIX_MADVISE], [ ], [ ])

    dnl Check for posix_madvise(..., POSIX_MADV_DONTNEED).
    JE_COMPILABLE([posix_madvise(..., POSIX_MADV_DONTNEED)], [
  #include <sys/mman.h>
  ], [
    posix_madvise((void *)0, 0, POSIX_MADV_DONTNEED);
  ], [je_cv_posix_madv_dontneed])
    if test "x${je_cv_posix_madv_dontneed}" = "xyes" ; then
      AC_DEFINE([JEMALLOC_PURGE_POSIX_MADVISE_DONTNEED], [ ], [ ])
    fi
  fi
fi

dnl ============================================================================
dnl Check for mprotect(2).

JE_COMPILABLE([mprotect(2)], [
#include <sys/mman.h>
], [
	mprotect((void *)0, 0, PROT_NONE);
], [je_cv_mprotect])
if test "x${je_cv_mprotect}" = "xyes" ; then
  AC_DEFINE([JEMALLOC_HAVE_MPROTECT], [ ], [ ])
fi

dnl ============================================================================
dnl Check for __builtin_clz(), __builtin_clzl(), and __builtin_clzll().

AC_CACHE_CHECK([for __builtin_clz],
               [je_cv_builtin_clz],
               [AC_LINK_IFELSE([AC_LANG_PROGRAM([],
                                                [
                                                {
                                                        unsigned x = 0;
                                                        int y = __builtin_clz(x);
                                                }
                                                {
                                                        unsigned long x = 0;
                                                        int y = __builtin_clzl(x);
                                                }
                                                {
                                                        unsigned long long x = 0;
                                                        int y = __builtin_clzll(x);
                                                }
                                                ])],
                               [je_cv_builtin_clz=yes],
                               [je_cv_builtin_clz=no])])

if test "x${je_cv_builtin_clz}" = "xyes" ; then
  AC_DEFINE([JEMALLOC_HAVE_BUILTIN_CLZ], [ ], [ ])
fi

dnl ============================================================================
dnl Check for os_unfair_lock operations as provided on Darwin.

JE_COMPILABLE([Darwin os_unfair_lock_*()], [
#include <os/lock.h>
#include <AvailabilityMacros.h>
], [
	#if MAC_OS_X_VERSION_MIN_REQUIRED < 101200
	#error "os_unfair_lock is not supported"
	#else
	os_unfair_lock lock = OS_UNFAIR_LOCK_INIT;
	os_unfair_lock_lock(&lock);
	os_unfair_lock_unlock(&lock);
	#endif
], [je_cv_os_unfair_lock])
if test "x${je_cv_os_unfair_lock}" = "xyes" ; then
  AC_DEFINE([JEMALLOC_OS_UNFAIR_LOCK], [ ], [ ])
fi

dnl ============================================================================
dnl Darwin-related configuration.

AC_ARG_ENABLE([zone-allocator],
  [AS_HELP_STRING([--disable-zone-allocator],
                  [Disable zone allocator for Darwin])],
[if test "x$enable_zone_allocator" = "xno" ; then
  enable_zone_allocator="0"
else
  enable_zone_allocator="1"
fi
],
[if test "x${abi}" = "xmacho"; then
  enable_zone_allocator="1"
fi
]
)
AC_SUBST([enable_zone_allocator])

if test "x${enable_zone_allocator}" = "x1" ; then
  if test "x${abi}" != "xmacho"; then
    AC_MSG_ERROR([--enable-zone-allocator is only supported on Darwin])
  fi
  AC_DEFINE([JEMALLOC_ZONE], [ ], [ ])
fi

dnl ============================================================================
dnl Use initial-exec TLS by default.
AC_ARG_ENABLE([initial-exec-tls],
  [AS_HELP_STRING([--disable-initial-exec-tls],
                  [Disable the initial-exec tls model])],
[if test "x$enable_initial_exec_tls" = "xno" ; then
  enable_initial_exec_tls="0"
else
  enable_initial_exec_tls="1"
fi
],
[enable_initial_exec_tls="1"]
)
AC_SUBST([enable_initial_exec_tls])

if test "x${je_cv_tls_model}" = "xyes" -a \
       "x${enable_initial_exec_tls}" = "x1" ; then
  AC_DEFINE([JEMALLOC_TLS_MODEL],
            [__attribute__((tls_model("initial-exec")))], 
            [ ])
else
  AC_DEFINE([JEMALLOC_TLS_MODEL], [ ], [ ])
fi

dnl ============================================================================
dnl Enable background threads if possible.

if test "x${have_pthread}" = "x1" -a "x${je_cv_os_unfair_lock}" != "xyes" -a \
       "x${abi}" != "xmacho" ; then
  AC_DEFINE([JEMALLOC_BACKGROUND_THREAD], [ ], [ ])
fi

dnl ============================================================================
dnl Check for glibc malloc hooks

if test "x$glibc" = "x1" ; then
  JE_COMPILABLE([glibc malloc hook], [
  #include <stddef.h>

  extern void (* __free_hook)(void *ptr);
  extern void *(* __malloc_hook)(size_t size);
  extern void *(* __realloc_hook)(void *ptr, size_t size);
], [
    void *ptr = 0L;
    if (__malloc_hook) ptr = __malloc_hook(1);
    if (__realloc_hook) ptr = __realloc_hook(ptr, 2);
    if (__free_hook && ptr) __free_hook(ptr);
], [je_cv_glibc_malloc_hook])
  if test "x${je_cv_glibc_malloc_hook}" = "xyes" ; then
    if test "x${JEMALLOC_PREFIX}" = "x" ; then
      AC_DEFINE([JEMALLOC_GLIBC_MALLOC_HOOK], [ ], [ ])
      wrap_syms="${wrap_syms} __free_hook __malloc_hook __realloc_hook"
    fi
  fi

  JE_COMPILABLE([glibc memalign hook], [
  #include <stddef.h>

  extern void *(* __memalign_hook)(size_t alignment, size_t size);
], [
    void *ptr = 0L;
    if (__memalign_hook) ptr = __memalign_hook(16, 7);
], [je_cv_glibc_memalign_hook])
  if test "x${je_cv_glibc_memalign_hook}" = "xyes" ; then
    if test "x${JEMALLOC_PREFIX}" = "x" ; then
      AC_DEFINE([JEMALLOC_GLIBC_MEMALIGN_HOOK], [ ], [ ])
      wrap_syms="${wrap_syms} __memalign_hook"
    fi
  fi
fi

JE_COMPILABLE([pthreads adaptive mutexes], [
#include <pthread.h>
], [
  pthread_mutexattr_t attr;
  pthread_mutexattr_init(&attr);
  pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_ADAPTIVE_NP);
  pthread_mutexattr_destroy(&attr);
], [je_cv_pthread_mutex_adaptive_np])
if test "x${je_cv_pthread_mutex_adaptive_np}" = "xyes" ; then
  AC_DEFINE([JEMALLOC_HAVE_PTHREAD_MUTEX_ADAPTIVE_NP], [ ], [ ])
fi

JE_CFLAGS_SAVE()
JE_CFLAGS_ADD([-D_GNU_SOURCE])
JE_CFLAGS_ADD([-Werror])
JE_CFLAGS_ADD([-herror_on_warning])
JE_COMPILABLE([strerror_r returns char with gnu source], [
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
], [
  char *buffer = (char *) malloc(100);
  char *error = strerror_r(EINVAL, buffer, 100);
  printf("%s\n", error);
], [je_cv_strerror_r_returns_char_with_gnu_source])
JE_CFLAGS_RESTORE()
if test "x${je_cv_strerror_r_returns_char_with_gnu_source}" = "xyes" ; then
  AC_DEFINE([JEMALLOC_STRERROR_R_RETURNS_CHAR_WITH_GNU_SOURCE], [ ], [ ])
fi

dnl ============================================================================
dnl Check for typedefs, structures, and compiler characteristics.
AC_HEADER_STDBOOL

dnl ============================================================================
dnl Define commands that generate output files.

AC_CONFIG_COMMANDS([include/jemalloc/internal/public_symbols.txt], [
  f="${objroot}include/jemalloc/internal/public_symbols.txt"
  mkdir -p "${objroot}include/jemalloc/internal"
  cp /dev/null "${f}"
  for nm in `echo ${mangling_map} |tr ',' ' '` ; do
    n=`echo ${nm} |tr ':' ' ' |awk '{print $[]1}'`
    m=`echo ${nm} |tr ':' ' ' |awk '{print $[]2}'`
    echo "${n}:${m}" >> "${f}"
    dnl Remove name from public_syms so that it isn't redefined later.
    public_syms=`for sym in ${public_syms}; do echo "${sym}"; done |grep -v "^${n}\$" |tr '\n' ' '`
  done
  for sym in ${public_syms} ; do
    n="${sym}"
    m="${JEMALLOC_PREFIX}${sym}"
    echo "${n}:${m}" >> "${f}"
  done
], [
  srcdir="${srcdir}"
  objroot="${objroot}"
  mangling_map="${mangling_map}"
  public_syms="${public_syms}"
  JEMALLOC_PREFIX="${JEMALLOC_PREFIX}"
])
AC_CONFIG_COMMANDS([include/jemalloc/internal/private_symbols.awk], [
  f="${objroot}include/jemalloc/internal/private_symbols.awk"
  mkdir -p "${objroot}include/jemalloc/internal"
  export_syms=`for sym in ${public_syms}; do echo "${JEMALLOC_PREFIX}${sym}"; done; for sym in ${wrap_syms}; do echo "${sym}"; done;`
  "${srcdir}/include/jemalloc/internal/private_symbols.sh" "${SYM_PREFIX}" ${export_syms} > "${objroot}include/jemalloc/internal/private_symbols.awk"
], [
  srcdir="${srcdir}"
  objroot="${objroot}"
  public_syms="${public_syms}"
  wrap_syms="${wrap_syms}"
  SYM_PREFIX="${SYM_PREFIX}"
  JEMALLOC_PREFIX="${JEMALLOC_PREFIX}"
])
AC_CONFIG_COMMANDS([include/jemalloc/internal/private_symbols_jet.awk], [
  f="${objroot}include/jemalloc/internal/private_symbols_jet.awk"
  mkdir -p "${objroot}include/jemalloc/internal"
  export_syms=`for sym in ${public_syms}; do echo "jet_${sym}"; done; for sym in ${wrap_syms}; do echo "${sym}"; done;`
  "${srcdir}/include/jemalloc/internal/private_symbols.sh" "${SYM_PREFIX}" ${export_syms} > "${objroot}include/jemalloc/internal/private_symbols_jet.awk"
], [
  srcdir="${srcdir}"
  objroot="${objroot}"
  public_syms="${public_syms}"
  wrap_syms="${wrap_syms}"
  SYM_PREFIX="${SYM_PREFIX}"
])
AC_CONFIG_COMMANDS([include/jemalloc/internal/public_namespace.h], [
  mkdir -p "${objroot}include/jemalloc/internal"
  "${srcdir}/include/jemalloc/internal/public_namespace.sh" "${objroot}include/jemalloc/internal/public_symbols.txt" > "${objroot}include/jemalloc/internal/public_namespace.h"
], [
  srcdir="${srcdir}"
  objroot="${objroot}"
])
AC_CONFIG_COMMANDS([include/jemalloc/internal/public_unnamespace.h], [
  mkdir -p "${objroot}include/jemalloc/internal"
  "${srcdir}/include/jemalloc/internal/public_unnamespace.sh" "${objroot}include/jemalloc/internal/public_symbols.txt" > "${objroot}include/jemalloc/internal/public_unnamespace.h"
], [
  srcdir="${srcdir}"
  objroot="${objroot}"
])
AC_CONFIG_COMMANDS([include/jemalloc/jemalloc_protos_jet.h], [
  mkdir -p "${objroot}include/jemalloc"
  cat "${srcdir}/include/jemalloc/jemalloc_protos.h.in" | sed -e 's/@je_@/jet_/g' > "${objroot}include/jemalloc/jemalloc_protos_jet.h"
], [
  srcdir="${srcdir}"
  objroot="${objroot}"
])
AC_CONFIG_COMMANDS([include/jemalloc/jemalloc_rename.h], [
  mkdir -p "${objroot}include/jemalloc"
  "${srcdir}/include/jemalloc/jemalloc_rename.sh" "${objroot}include/jemalloc/internal/public_symbols.txt" > "${objroot}include/jemalloc/jemalloc_rename.h"
], [
  srcdir="${srcdir}"
  objroot="${objroot}"
])
AC_CONFIG_COMMANDS([include/jemalloc/jemalloc_mangle.h], [
  mkdir -p "${objroot}include/jemalloc"
  "${srcdir}/include/jemalloc/jemalloc_mangle.sh" "${objroot}include/jemalloc/internal/public_symbols.txt" je_ > "${objroot}include/jemalloc/jemalloc_mangle.h"
], [
  srcdir="${srcdir}"
  objroot="${objroot}"
])
AC_CONFIG_COMMANDS([include/jemalloc/jemalloc_mangle_jet.h], [
  mkdir -p "${objroot}include/jemalloc"
  "${srcdir}/include/jemalloc/jemalloc_mangle.sh" "${objroot}include/jemalloc/internal/public_symbols.txt" jet_ > "${objroot}include/jemalloc/jemalloc_mangle_jet.h"
], [
  srcdir="${srcdir}"
  objroot="${objroot}"
])
AC_CONFIG_COMMANDS([include/jemalloc/jemalloc.h], [
  mkdir -p "${objroot}include/jemalloc"
  "${srcdir}/include/jemalloc/jemalloc.sh" "${objroot}" > "${objroot}include/jemalloc/jemalloc${install_suffix}.h"
], [
  srcdir="${srcdir}"
  objroot="${objroot}"
  install_suffix="${install_suffix}"
])

dnl Process .in files.
AC_SUBST([cfghdrs_in])
AC_SUBST([cfghdrs_out])
AC_CONFIG_HEADERS([$cfghdrs_tup])

dnl ============================================================================
dnl Generate outputs.

AC_CONFIG_FILES([$cfgoutputs_tup config.stamp bin/jemalloc-config bin/jemalloc.sh bin/jeprof])
AC_SUBST([cfgoutputs_in])
AC_SUBST([cfgoutputs_out])
AC_OUTPUT

dnl ============================================================================
dnl Print out the results of configuration.
AC_MSG_RESULT([===============================================================================])
AC_MSG_RESULT([jemalloc version   : ${jemalloc_version}])
AC_MSG_RESULT([library revision   : ${rev}])
AC_MSG_RESULT([])
AC_MSG_RESULT([CONFIG             : ${CONFIG}])
AC_MSG_RESULT([CC                 : ${CC}])
AC_MSG_RESULT([CONFIGURE_CFLAGS   : ${CONFIGURE_CFLAGS}])
AC_MSG_RESULT([SPECIFIED_CFLAGS   : ${SPECIFIED_CFLAGS}])
AC_MSG_RESULT([EXTRA_CFLAGS       : ${EXTRA_CFLAGS}])
AC_MSG_RESULT([CPPFLAGS           : ${CPPFLAGS}])
AC_MSG_RESULT([CXX                : ${CXX}])
AC_MSG_RESULT([CONFIGURE_CXXFLAGS : ${CONFIGURE_CXXFLAGS}])
AC_MSG_RESULT([SPECIFIED_CXXFLAGS : ${SPECIFIED_CXXFLAGS}])
AC_MSG_RESULT([EXTRA_CXXFLAGS     : ${EXTRA_CXXFLAGS}])
AC_MSG_RESULT([LDFLAGS            : ${LDFLAGS}])
AC_MSG_RESULT([EXTRA_LDFLAGS      : ${EXTRA_LDFLAGS}])
AC_MSG_RESULT([DSO_LDFLAGS        : ${DSO_LDFLAGS}])
AC_MSG_RESULT([LIBS               : ${LIBS}])
AC_MSG_RESULT([RPATH_EXTRA        : ${RPATH_EXTRA}])
AC_MSG_RESULT([])
AC_MSG_RESULT([XSLTPROC           : ${XSLTPROC}])
AC_MSG_RESULT([XSLROOT            : ${XSLROOT}])
AC_MSG_RESULT([])
AC_MSG_RESULT([PREFIX             : ${PREFIX}])
AC_MSG_RESULT([BINDIR             : ${BINDIR}])
AC_MSG_RESULT([DATADIR            : ${DATADIR}])
AC_MSG_RESULT([INCLUDEDIR         : ${INCLUDEDIR}])
AC_MSG_RESULT([LIBDIR             : ${LIBDIR}])
AC_MSG_RESULT([MANDIR             : ${MANDIR}])
AC_MSG_RESULT([])
AC_MSG_RESULT([srcroot            : ${srcroot}])
AC_MSG_RESULT([abs_srcroot        : ${abs_srcroot}])
AC_MSG_RESULT([objroot            : ${objroot}])
AC_MSG_RESULT([abs_objroot        : ${abs_objroot}])
AC_MSG_RESULT([])
AC_MSG_RESULT([JEMALLOC_PREFIX    : ${JEMALLOC_PREFIX}])
AC_MSG_RESULT([JEMALLOC_PRIVATE_NAMESPACE])
AC_MSG_RESULT([                   : ${JEMALLOC_PRIVATE_NAMESPACE}])
AC_MSG_RESULT([install_suffix     : ${install_suffix}])
AC_MSG_RESULT([malloc_conf        : ${config_malloc_conf}])
AC_MSG_RESULT([documentation      : ${enable_doc}])
AC_MSG_RESULT([shared libs        : ${enable_shared}])
AC_MSG_RESULT([static libs        : ${enable_static}])
AC_MSG_RESULT([autogen            : ${enable_autogen}])
AC_MSG_RESULT([debug              : ${enable_debug}])
AC_MSG_RESULT([stats              : ${enable_stats}])
AC_MSG_RESULT([experimental_smallocx : ${enable_experimental_smallocx}])
AC_MSG_RESULT([prof               : ${enable_prof}])
AC_MSG_RESULT([prof-libunwind     : ${enable_prof_libunwind}])
AC_MSG_RESULT([prof-libgcc        : ${enable_prof_libgcc}])
AC_MSG_RESULT([prof-gcc           : ${enable_prof_gcc}])
AC_MSG_RESULT([fill               : ${enable_fill}])
AC_MSG_RESULT([utrace             : ${enable_utrace}])
AC_MSG_RESULT([xmalloc            : ${enable_xmalloc}])
AC_MSG_RESULT([log                : ${enable_log}])
AC_MSG_RESULT([lazy_lock          : ${enable_lazy_lock}])
AC_MSG_RESULT([cache-oblivious    : ${enable_cache_oblivious}])
AC_MSG_RESULT([cxx                : ${enable_cxx}])
AC_MSG_RESULT([===============================================================================])