dnl Process this file with autoconf to produce configure.

dnl Notes on version numbering:
dnl   For an implementation-only change:
dnl     Change the libotr package version from a.b.c to a.b.(c+1)
dnl     Change the libotr libtool version from x:y:z to x:(y+1):z
dnl   For a backwards-compatible API change (e.g. adding functions):
dnl     Change the libotr package version from a.b.c to a.(b+1).0
dnl     Change the libotr libtool version from x:y:z to (x+1):0:(z+1)
dnl       [Note that this does *not* change the major number of the .so.]
dnl   For a backwards-incompatible API change (e.g. changing data structures):
dnl     Change the libotr package version from a.b.c to (a+1).0.0
dnl     Change the libotr libtool version from x:y:z to (x+1):0:0
AC_INIT([libotr],[4.1.1],[otr@cypherpunks.ca],[],[https://otr.cypherpunks.ca])

AM_CONFIG_HEADER(config.h)
AC_CONFIG_AUX_DIR([config])

AM_INIT_AUTOMAKE
LIBOTR_LIBTOOL_VERSION="6:1:1"

AC_CONFIG_MACRO_DIR([config])
# Silent compilation so warnings can be spotted.
m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])

AC_SUBST(LIBOTR_LIBTOOL_VERSION)

AC_PROG_CC
LT_INIT

AM_PATH_LIBGCRYPT(1:1.2.0,,AC_MSG_ERROR(libgcrypt 1.2.0 or newer is required.))

AC_CANONICAL_HOST
# Identify which OS we are building and do specific things based on the host
case $host_os in
  *linux*)
    HOST_OS=linux
    ;;
esac

# Build tests for now only for Linux.
AM_CONDITIONAL([BUILD_TESTS], [test x$HOST_OS = xlinux])

dnl 1:flags
dnl Taken from Tor's autoconf magic repository
AC_DEFUN([OTR_CHECK_CFLAGS], [
  AS_VAR_PUSHDEF([VAR],[otr_cv_cflags_$1])
  AC_CACHE_CHECK([whether the compiler accepts $1], VAR, [
    otr_saved_CFLAGS="$CFLAGS"
    CFLAGS="$CFLAGS -pedantic -Werror $1"
    AC_TRY_COMPILE([], [return 0;],
                   [AS_VAR_SET(VAR,yes)],
                   [AS_VAR_SET(VAR,no)])
    CFLAGS="$otr_saved_CFLAGS"
  ])
  if test x$VAR = xyes; then
    CFLAGS="$CFLAGS $1"
  fi
  AS_VAR_POPDEF([VAR])
])

dnl 1:flags
dnl 2:extra ldflags
dnl 3:extra libraries
AC_DEFUN([OTR_CHECK_LDFLAGS], [
  AS_VAR_PUSHDEF([VAR],[otr_cv_ldflags_$1])
  AC_CACHE_CHECK([whether the linker accepts $1], VAR, [
    otr_saved_CFLAGS="$CFLAGS"
    otr_saved_LDFLAGS="$LDFLAGS"
    otr_saved_LIBS="$LIBS"
    CFLAGS="$CFLAGS -pedantic -Werror"
    LDFLAGS="$LDFLAGS $2 $1"
    LIBS="$LIBS $3"
    AC_RUN_IFELSE([AC_LANG_PROGRAM([#include <stdio.h>], [fputs("", stdout)])],
                  [AS_VAR_SET(VAR,yes)],
                  [AS_VAR_SET(VAR,no)],
           [AC_TRY_LINK([], [return 0;],
                                   [AS_VAR_SET(VAR,yes)],
                                   [AS_VAR_SET(VAR,no)])])
    CFLAGS="$otr_saved_CFLAGS"
    LDFLAGS="$otr_saved_LDFLAGS"
    LIBS="$otr_saved_LIBS"
  ])
  if test x$VAR = xyes; then
    LDFLAGS="$LDFLAGS $1"
  fi
  AS_VAR_POPDEF([VAR])
])


dnl If _WIN32 is defined and non-zero, we are building for win32
AC_MSG_CHECKING([for win32])
AC_RUN_IFELSE([AC_LANG_SOURCE([
int main(int c, char **v) {
#ifdef _WIN32
#if _WIN32
  return 0;
#else
  return 1;
#endif
#else
  return 2;
#endif
}])],
bwin32=true; AC_MSG_RESULT([yes]),
bwin32=false; AC_MSG_RESULT([no]),
bwin32=cross; AC_MSG_RESULT([cross])
)

if test "$bwin32" = cross; then
AC_MSG_CHECKING([for win32 (cross)])
AC_COMPILE_IFELSE([AC_LANG_SOURCE([
#ifdef _WIN32
int main(int c, char **v) {return 0;}
#else
#error
int main(int c, char **v) {return x(y);}
#endif
])],
bwin32=true; AC_MSG_RESULT([yes]),
bwin32=false; AC_MSG_RESULT([no]))
fi

AM_CONDITIONAL(BUILD_NT_SERVICES, test x$bwin32 = xtrue)

dnl Adam Shostack suggests the following for Windows:
dnl -D_FORTIFY_SOURCE=2 -fstack-protector-all
dnl Others suggest '/gs /safeseh /nxcompat /dynamicbase' for non-gcc on Windows
dnl This requires that we use gcc and that we add -O2 to the CFLAGS.
AC_ARG_ENABLE(gcc-hardening,
    AS_HELP_STRING(--disable-gcc-hardening, disable compiler security checks))

dnl Linker hardening options
dnl Currently these options are ELF specific - you can't use this with MacOSX
AC_ARG_ENABLE(linker-hardening,
    AS_HELP_STRING(--disable-linker-hardening, disable linker security fixups))

dnl ---------------------------------------------------------------------
dnl Now that we know about our major libraries, we can check for compiler
dnl and linker hardening options.  We need to do this with the libraries known,
dnl since sometimes the linker will like an option but not be willing to
dnl use it with a build of a library.

all_ldflags_for_check="$LDFLAGS"
all_libs_for_check="$LIBGCRYPT_LIBS"

AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [
#if !defined(__clang__)
#error
#endif
])], have_clang=yes, have_clang=no)

if test x$enable_gcc_hardening != xno; then
    CFLAGS="$CFLAGS -D_FORTIFY_SOURCE=2"
    if test x$have_clang = xyes; then
       OTR_CHECK_CFLAGS(-Qunused-arguments)
    fi
    OTR_CHECK_CFLAGS(-fstack-protector-all)
    OTR_CHECK_CFLAGS(-Wstack-protector)
    OTR_CHECK_CFLAGS(-fwrapv)

    dnl Ian added the next four:
    OTR_CHECK_CFLAGS(-fno-strict-overflow)
    OTR_CHECK_CFLAGS(-Wall)
    OTR_CHECK_CFLAGS(-Wextra -Wno-unused-parameter)
    OTR_CHECK_CFLAGS(-Wformat-security)

    OTR_CHECK_CFLAGS(--param ssp-buffer-size=1)
    if test "$bwin32" = "false"; then
       OTR_CHECK_CFLAGS(-fPIE)
       OTR_CHECK_LDFLAGS(-pie, "$all_ldflags_for_check", "$all_libs_for_check")
    else
        OTR_CHECK_CFLAGS(-fPIE)
        OTR_CHECK_LDFLAGS(-pie, "$all_ldflags_for_check", "$all_libs_for_check")
        OTR_CHECK_LDFLAGS([-Wl,--dynamicbase], "$all_ldflags_for_check", "$all_libs_for_check")
        OTR_CHECK_LDFLAGS([-Wl,--nxcompat], "$all_ldflags_for_check", "$all_libs_for_check")
    fi
fi

if test x$enable_linker_hardening != xno; then
    OTR_CHECK_LDFLAGS(-z relro -z now, "$all_ldflags_for_check", "$all_libs_for_check")
fi

AC_OUTPUT([Makefile src/Makefile toolkit/Makefile tests/Makefile tests/utils/Makefile libotr.pc
           tests/utils/tap/Makefile
           tests/unit/Makefile
           tests/regression/Makefile
           tests/regression/client/Makefile
])

AC_OUTPUT