diff options
Diffstat (limited to 'libc-top-half/musl/configure')
| -rwxr-xr-x | libc-top-half/musl/configure | 814 |
1 files changed, 814 insertions, 0 deletions
diff --git a/libc-top-half/musl/configure b/libc-top-half/musl/configure new file mode 100755 index 0000000..931d556 --- /dev/null +++ b/libc-top-half/musl/configure @@ -0,0 +1,814 @@ +#!/bin/sh + +usage () { +cat <<EOF +Usage: $0 [OPTION]... [VAR=VALUE]... [TARGET] + +To assign environment variables (e.g., CC, CFLAGS...), specify them as +VAR=VALUE. See below for descriptions of some of the useful variables. + +Defaults for the options are specified in brackets. + +Configuration: + --srcdir=DIR source directory [detected] + +Installation directories: + --prefix=PREFIX main installation prefix [/usr/local/musl] + --exec-prefix=EPREFIX installation prefix for executable files [PREFIX] + +Fine tuning of the installation directories: + --bindir=DIR user executables [EPREFIX/bin] + --libdir=DIR library files for the linker [PREFIX/lib] + --includedir=DIR include files for the C compiler [PREFIX/include] + --syslibdir=DIR location for the dynamic linker [/lib] + +System types: + --target=TARGET configure to run on target TARGET [detected] + --host=HOST same as --target + --build=BUILD build system type; used only to infer cross-compiling + +Optional features: + --enable-optimize=... optimize listed components for speed over size [auto] + --enable-debug build with debugging information [disabled] + --disable-warnings build with recommended warnings flags [enabled] + --enable-wrapper=... build given musl toolchain wrapper [auto] + --disable-shared inhibit building shared library [enabled] + --disable-static inhibit building static library [enabled] + +Optional packages: + --with-malloc=... choose malloc implementation [mallocng] + +Some influential environment variables: + CC C compiler command [detected] + CFLAGS C compiler flags [-Os -pipe ...] + CROSS_COMPILE prefix for cross compiler and tools [none] + LIBCC compiler runtime library [detected] + +Use these variables to override the choices made by configure. + +EOF +exit 0 +} + +# Helper functions + +quote () { +tr '\n' ' ' <<EOF | grep '^[-[:alnum:]_=,./:]* $' >/dev/null 2>&1 && { echo "$1" ; return 0 ; } +$1 +EOF +printf %s\\n "$1" | sed -e "s/'/'\\\\''/g" -e "1s/^/'/" -e "\$s/\$/'/" -e "s#^'\([-[:alnum:]_,./:]*\)=\(.*\)\$#\1='\2#" +} +echo () { printf "%s\n" "$*" ; } +fail () { echo "$*" ; exit 1 ; } +fnmatch () { eval "case \"\$2\" in $1) return 0 ;; *) return 1 ;; esac" ; } +cmdexists () { type "$1" >/dev/null 2>&1 ; } +trycc () { test -z "$CC" && cmdexists "$1" && CC=$1 ; } + +stripdir () { +while eval "fnmatch '*/' \"\${$1}\"" ; do eval "$1=\${$1%/}" ; done +} + +trycppif () { +printf "checking preprocessor condition %s... " "$1" +echo "typedef int x;" > "$tmpc" +echo "#if $1" >> "$tmpc" +echo "#error yes" >> "$tmpc" +echo "#endif" >> "$tmpc" +if $CC $2 -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then +printf "false\n" +return 1 +else +printf "true\n" +return 0 +fi +} + +tryflag () { +printf "checking whether compiler accepts %s... " "$2" +echo "typedef int x;" > "$tmpc" +if $CC $CFLAGS_TRY $2 -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then +printf "yes\n" +eval "$1=\"\${$1} \$2\"" +eval "$1=\${$1# }" +return 0 +else +printf "no\n" +return 1 +fi +} + +tryldflag () { +printf "checking whether linker accepts %s... " "$2" +echo "typedef int x;" > "$tmpc" +if $CC $LDFLAGS_TRY -nostdlib -shared "$2" -o /dev/null "$tmpc" >/dev/null 2>&1 ; then +printf "yes\n" +eval "$1=\"\${$1} \$2\"" +eval "$1=\${$1# }" +return 0 +else +printf "no\n" +return 1 +fi +} + + + +# Beginning of actual script + +CFLAGS_C99FSE= +CFLAGS_AUTO= +CFLAGS_MEMOPS= +CFLAGS_NOSSP= +CFLAGS_TRY= +LDFLAGS_AUTO= +LDFLAGS_TRY= +OPTIMIZE_GLOBS= +srcdir= +prefix=/usr/local/musl +exec_prefix='$(prefix)' +bindir='$(exec_prefix)/bin' +libdir='$(prefix)/lib' +includedir='$(prefix)/include' +syslibdir='/lib' +tools= +tool_libs= +build= +target= +optimize=auto +debug=no +warnings=yes +shared=auto +static=yes +wrapper=auto +gcc_wrapper=no +clang_wrapper=no +malloc_dir=mallocng + +for arg ; do +case "$arg" in +--help|-h) usage ;; +--srcdir=*) srcdir=${arg#*=} ;; +--prefix=*) prefix=${arg#*=} ;; +--exec-prefix=*) exec_prefix=${arg#*=} ;; +--bindir=*) bindir=${arg#*=} ;; +--libdir=*) libdir=${arg#*=} ;; +--includedir=*) includedir=${arg#*=} ;; +--syslibdir=*) syslibdir=${arg#*=} ;; +--enable-shared|--enable-shared=yes) shared=yes ;; +--disable-shared|--enable-shared=no) shared=no ;; +--enable-static|--enable-static=yes) static=yes ;; +--disable-static|--enable-static=no) static=no ;; +--enable-optimize) optimize=yes ;; +--enable-optimize=*) optimize=${arg#*=} ;; +--disable-optimize) optimize=no ;; +--enable-debug|--enable-debug=yes) debug=yes ;; +--disable-debug|--enable-debug=no) debug=no ;; +--enable-warnings|--enable-warnings=yes) warnings=yes ;; +--disable-warnings|--enable-warnings=no) warnings=no ;; +--enable-wrapper|--enable-wrapper=yes) wrapper=detect ;; +--enable-wrapper=all) wrapper=yes ; gcc_wrapper=yes ; clang_wrapper=yes ;; +--enable-wrapper=gcc) wrapper=yes ; gcc_wrapper=yes ;; +--enable-wrapper=clang) wrapper=yes ; clang_wrapper=yes ;; +--disable-wrapper|--enable-wrapper=no) wrapper=no ;; +--enable-gcc-wrapper|--enable-gcc-wrapper=yes) wrapper=yes ; gcc_wrapper=yes ;; +--disable-gcc-wrapper|--enable-gcc-wrapper=no) wrapper=no ;; +--with-malloc=*) malloc_dir=${arg#*=} ;; +--enable-*|--disable-*|--with-*|--without-*|--*dir=*) ;; +--host=*|--target=*) target=${arg#*=} ;; +--build=*) build=${arg#*=} ;; +-* ) echo "$0: unknown option $arg" ;; +AR=*) AR=${arg#*=} ;; +RANLIB=*) RANLIB=${arg#*=} ;; +CC=*) CC=${arg#*=} ;; +CFLAGS=*) CFLAGS=${arg#*=} ;; +CPPFLAGS=*) CPPFLAGS=${arg#*=} ;; +LDFLAGS=*) LDFLAGS=${arg#*=} ;; +CROSS_COMPILE=*) CROSS_COMPILE=${arg#*=} ;; +LIBCC=*) LIBCC=${arg#*=} ;; +*=*) ;; +*) build=$arg ; target=$arg ;; +esac +done + +for i in srcdir prefix exec_prefix bindir libdir includedir syslibdir ; do +stripdir $i +done + +# +# Get the source dir for out-of-tree builds +# +if test -z "$srcdir" ; then +srcdir="${0%/configure}" +stripdir srcdir +fi +abs_builddir="$(pwd)" || fail "$0: cannot determine working directory" +abs_srcdir="$(cd $srcdir && pwd)" || fail "$0: invalid source directory $srcdir" +test "$abs_srcdir" = "$abs_builddir" && srcdir=. +test "$srcdir" != "." && test -f Makefile && test ! -h Makefile && fail "$0: Makefile already exists in the working directory" + +# +# Get a temp filename we can use +# +i=0 +set -C +while : ; do i=$(($i+1)) +tmpc="./conf$$-$PPID-$i.c" +2>|/dev/null > "$tmpc" && break +test "$i" -gt 50 && fail "$0: cannot create temporary file $tmpc" +done +set +C +trap 'rm "$tmpc"' EXIT INT QUIT TERM HUP + +# +# Check that the requested malloc implementation exists +# +test -d "$srcdir/src/malloc/$malloc_dir" \ +|| fail "$0: error: chosen malloc implementation '$malloc_dir' does not exist" + +# +# Check whether we are cross-compiling, and set a default +# CROSS_COMPILE prefix if none was provided. +# +test "$target" && \ +test "$target" != "$build" && \ +test -z "$CROSS_COMPILE" && \ +CROSS_COMPILE="$target-" + +# +# Find a C compiler to use +# +printf "checking for C compiler... " +trycc ${CROSS_COMPILE}gcc +trycc ${CROSS_COMPILE}c99 +trycc ${CROSS_COMPILE}cc +printf "%s\n" "$CC" +test -n "$CC" || { echo "$0: cannot find a C compiler" ; exit 1 ; } + +printf "checking whether C compiler works... " +echo "typedef int x;" > "$tmpc" +if output=$($CC $CPPFLAGS $CFLAGS -c -o /dev/null "$tmpc" 2>&1) ; then +printf "yes\n" +else +printf "no; compiler output follows:\n%s\n" "$output" +exit 1 +fi + +# +# Figure out options to force errors on unknown flags. +# +tryflag CFLAGS_TRY -Werror=unknown-warning-option +tryflag CFLAGS_TRY -Werror=unused-command-line-argument +tryflag CFLAGS_TRY -Werror=ignored-optimization-argument +tryldflag LDFLAGS_TRY -Werror=unknown-warning-option +tryldflag LDFLAGS_TRY -Werror=unused-command-line-argument + +# +# Need to know if the compiler is gcc or clang to decide which toolchain +# wrappers to build. +# +printf "checking for C compiler family... " +cc_ver="$(LC_ALL=C $CC -v 2>&1)" +cc_family=unknown +if fnmatch '*gcc\ version*' "$cc_ver" ; then +cc_family=gcc +elif fnmatch '*clang\ version*' "$cc_ver" ; then +cc_family=clang +fi +echo "$cc_family" + +# +# Figure out toolchain wrapper to build +# +if test "$wrapper" = auto || test "$wrapper" = detect ; then +echo "#include <stdlib.h>" > "$tmpc" +echo "#if ! __GLIBC__" >> "$tmpc" +echo "#error no" >> "$tmpc" +echo "#endif" >> "$tmpc" +printf "checking for toolchain wrapper to build... " +if test "$wrapper" = auto && ! $CC -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then +echo "none" +elif test "$cc_family" = gcc ; then +gcc_wrapper=yes +echo "gcc" +elif test "$cc_family" = clang ; then +clang_wrapper=yes +echo "clang" +else +echo "none" +if test "$wrapper" = detect ; then +fail "$0: could not find an appropriate toolchain wrapper" +fi +fi +fi + +if test "$gcc_wrapper" = yes ; then +tools="$tools obj/musl-gcc" +tool_libs="$tool_libs lib/musl-gcc.specs" +fi +if test "$clang_wrapper" = yes ; then +tools="$tools obj/musl-clang obj/ld.musl-clang" +fi + +# +# Find the target architecture +# +printf "checking target system type... " +test -n "$target" || target=$($CC -dumpmachine 2>/dev/null) || target=unknown +printf "%s\n" "$target" + +# +# Convert to just ARCH +# +case "$target" in +# Catch these early to simplify matching for 32-bit archs +arm*) ARCH=arm ;; +aarch64*) ARCH=aarch64 ;; +i?86-nt32*) ARCH=nt32 ;; +i?86*) ARCH=i386 ;; +x86_64-x32*|x32*|x86_64*x32) ARCH=x32 ;; +x86_64-nt64*) ARCH=nt64 ;; +x86_64*) ARCH=x86_64 ;; +m68k*) ARCH=m68k ;; +mips64*|mipsisa64*) ARCH=mips64 ;; +mips*) ARCH=mips ;; +microblaze*) ARCH=microblaze ;; +or1k*) ARCH=or1k ;; +powerpc64*|ppc64*) ARCH=powerpc64 ;; +powerpc*|ppc*) ARCH=powerpc ;; +riscv64*) ARCH=riscv64 ;; +sh[1-9bel-]*|sh|superh*) ARCH=sh ;; +s390x*) ARCH=s390x ;; +wasm32) ARCH=wasm32 ;; +wasm64) ARCH=wasm64 ;; +unknown) fail "$0: unable to detect target arch; try $0 --target=..." ;; +*) fail "$0: unknown or unsupported target \"$target\"" ;; +esac + +# +# Try to get a conforming C99 freestanding environment +# +tryflag CFLAGS_C99FSE -std=c99 +tryflag CFLAGS_C99FSE -nostdinc +tryflag CFLAGS_C99FSE -ffreestanding \ +|| tryflag CFLAGS_C99FSE -fno-builtin +tryflag CFLAGS_C99FSE -fexcess-precision=standard \ +|| { test "$ARCH" = i386 && tryflag CFLAGS_C99FSE -ffloat-store ; } +tryflag CFLAGS_C99FSE -frounding-math + +# +# We may use the may_alias attribute if __GNUC__ is defined, so +# if the compiler defines __GNUC__ but does not provide it, +# it must be defined away as part of the CFLAGS. +# +printf "checking whether compiler needs attribute((may_alias)) suppression... " +cat > "$tmpc" <<EOF +typedef int +#ifdef __GNUC__ +__attribute__((__may_alias__)) +#endif +x; +EOF +if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS \ + -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then +printf "no\n" +else +printf "yes\n" +CFLAGS_C99FSE="$CFLAGS_C99FSE -D__may_alias__=" +fi + +# +# The GNU toolchain defaults to assuming unmarked files need an +# executable stack, potentially exposing vulnerabilities in programs +# linked with such object files. Fix this. +# +tryflag CFLAGS_C99FSE -Wa,--noexecstack + +# +# Check for options to disable stack protector, which needs to be +# disabled for a few early-bootstrap translation units. If not found, +# this is not an error; we assume the toolchain does not do ssp. +# +tryflag CFLAGS_NOSSP -fno-stack-protector + +# +# Check for options that may be needed to prevent the compiler from +# generating self-referential versions of memcpy,, memmove, memcmp, +# and memset. Really, we should add a check to determine if this +# option is sufficient, and if not, add a macro to cripple these +# functions with volatile... +# +tryflag CFLAGS_MEMOPS -fno-tree-loop-distribute-patterns + +# +# Enable debugging if requessted. +# +test "$debug" = yes && CFLAGS_AUTO=-g + +# +# Preprocess asm files to add extra debugging information if debug is +# enabled, our assembler supports the needed directives, and the +# preprocessing script has been written for our architecture. +# +printf "checking whether we should preprocess assembly to add debugging information... " +if fnmatch '-g*|*\ -g*' "$CFLAGS_AUTO $CFLAGS" && + test -f "$srcdir/tools/add-cfi.$ARCH.awk" && + printf ".file 1 \"srcfile.s\"\n.line 1\n.cfi_startproc\n.cfi_endproc" | $CC -g -x assembler -c -o /dev/null 2>/dev/null - +then + ADD_CFI=yes +else + ADD_CFI=no +fi +printf "%s\n" "$ADD_CFI" + +# +# Possibly add a -O option to CFLAGS and select modules to optimize with +# -O3 based on the status of --enable-optimize and provided CFLAGS. +# +printf "checking for optimization settings... " +case "x$optimize" in +xauto) +if fnmatch '-O*|*\ -O*' "$CFLAGS_AUTO $CFLAGS" ; then +printf "using provided CFLAGS\n" ;optimize=no +else +printf "using defaults\n" ; optimize=yes +fi +;; +xsize|xnone) printf "minimize size\n" ; optimize=size ;; +xno|x) printf "disabled\n" ; optimize=no ;; +*) printf "custom\n" ;; +esac + +test "$optimize" = no || tryflag CFLAGS_AUTO -Os || tryflag CFLAGS_AUTO -O2 +test "$optimize" = yes && optimize="internal,malloc,string" + +if fnmatch 'no|size' "$optimize" ; then : +else +printf "components to be optimized for speed:" +while test "$optimize" ; do +case "$optimize" in +*,*) this=${optimize%%,*} optimize=${optimize#*,} ;; +*) this=$optimize optimize= +esac +printf " $this" +case "$this" in +*/*.c) ;; +*/*) this=$this*.c ;; +*) this=$this/*.c ;; +esac +OPTIMIZE_GLOBS="$OPTIMIZE_GLOBS $this" +done +OPTIMIZE_GLOBS=${OPTIMIZE_GLOBS# } +printf "\n" +fi + +# Always try -pipe +tryflag CFLAGS_AUTO -pipe + +# +# If debugging is disabled, omit frame pointer. Modern GCC does this +# anyway on most archs even when debugging is enabled since the frame +# pointer is no longer needed for debugging. +# +if fnmatch '-g*|*\ -g*' "$CFLAGS_AUTO $CFLAGS" ; then : +else +tryflag CFLAGS_AUTO -fomit-frame-pointer +fi + +# +# Modern GCC wants to put DWARF tables (used for debugging and +# unwinding) in the loaded part of the program where they are +# unstrippable. These options force them back to debug sections (and +# cause them not to get generated at all if debugging is off). +# +tryflag CFLAGS_AUTO -fno-unwind-tables +tryflag CFLAGS_AUTO -fno-asynchronous-unwind-tables + +# +# Attempt to put each function and each data object in its own +# section. This both allows additional size optimizations at link +# time and works around a dangerous class of compiler/assembler bugs +# whereby relative address expressions are constant-folded by the +# assembler even when one or more of the symbols involved is +# replaceable. See gas pr 18561 and gcc pr 66609, 68178, etc. +# +tryflag CFLAGS_AUTO -ffunction-sections +tryflag CFLAGS_AUTO -fdata-sections + +# +# On x86, make sure we don't have incompatible instruction set +# extensions enabled by default. This is bad for making static binaries. +# We cheat and use i486 rather than i386 because i386 really does not +# work anyway (issues with atomic ops). +# Some build environments pass -march and -mtune options via CC, so +# check both CC and CFLAGS. +# +if test "$ARCH" = "i386" ; then +fnmatch '-march=*|*\ -march=*' "$CC $CFLAGS" || tryldflag CFLAGS_AUTO -march=i486 +fnmatch '-mtune=*|*\ -mtune=*' "$CC $CFLAGS" || tryldflag CFLAGS_AUTO -mtune=generic +fi + +# +# GCC defines -w as overriding any -W options, regardless of order, but +# clang has a bunch of annoying warnings enabled by default and needs -w +# to start from a clean slate. So use -w if building with clang. Also +# turn off a common on-by-default cast warning regardless of compiler. +# +test "$cc_family" = clang && tryflag CFLAGS_AUTO -w + +tryflag CFLAGS_AUTO -Wno-pointer-to-int-cast + +# +# Even with -std=c99, gcc accepts some constructs which are constraint +# violations. We want to treat these as errors regardless of whether +# other purely stylistic warnings are enabled -- especially implicit +# function declarations, which are a dangerous programming error. +# +tryflag CFLAGS_AUTO -Werror=implicit-function-declaration +tryflag CFLAGS_AUTO -Werror=implicit-int +tryflag CFLAGS_AUTO -Werror=pointer-sign +tryflag CFLAGS_AUTO -Werror=pointer-arith +tryflag CFLAGS_AUTO -Werror=int-conversion +tryflag CFLAGS_AUTO -Werror=incompatible-pointer-types +tryflag CFLAGS_AUTO -Werror=discarded-qualifiers +tryflag CFLAGS_AUTO -Werror=discarded-array-qualifiers + +# +# GCC ignores unused arguements by default, but Clang needs this extra +# parameter to stop printing warnings about LDFLAGS passed during +# compiling stage and CFLAGS passed during linking stage. +# +test "$cc_family" = clang && tryflag CFLAGS_AUTO -Qunused-arguments + +if test "x$warnings" = xyes ; then +tryflag CFLAGS_AUTO -Waddress +tryflag CFLAGS_AUTO -Warray-bounds +tryflag CFLAGS_AUTO -Wchar-subscripts +tryflag CFLAGS_AUTO -Wduplicate-decl-specifier +tryflag CFLAGS_AUTO -Winit-self +tryflag CFLAGS_AUTO -Wreturn-type +tryflag CFLAGS_AUTO -Wsequence-point +tryflag CFLAGS_AUTO -Wstrict-aliasing +tryflag CFLAGS_AUTO -Wunused-function +tryflag CFLAGS_AUTO -Wunused-label +tryflag CFLAGS_AUTO -Wunused-variable +fi + +# Determine if the compiler produces position-independent code (PIC) +# by default. If so, we don't need to compile separate object files +# for libc.a and libc.so. +if trycppif __PIC__ "$CFLAGS_C99FSE $CPPFLAGS $CFLAGS" ; then +pic_default=yes +else +pic_default=no +fi + +# Reduce space lost to padding for alignment purposes by sorting data +# objects according to their alignment reqirements. This approximates +# optimal packing. +tryldflag LDFLAGS_AUTO -Wl,--sort-section,alignment +tryldflag LDFLAGS_AUTO -Wl,--sort-common + +# When linking shared library, drop dummy weak definitions that were +# replaced by strong definitions from other translation units. +tryldflag LDFLAGS_AUTO -Wl,--gc-sections + +# Some patched GCC builds have these defaults messed up... +tryldflag LDFLAGS_AUTO -Wl,--hash-style=both + +# Prevent linking if there are undefined symbols; if any exist, +# libc.so will crash at runtime during relocation processing. +# The common way this can happen is failure to link the compiler +# runtime library; implementation error is also a possibility. +tryldflag LDFLAGS_AUTO -Wl,--no-undefined + +# Avoid exporting symbols from compiler runtime libraries. They +# should be hidden anyway, but some toolchains including old gcc +# versions built without shared library support and pcc are broken. +tryldflag LDFLAGS_AUTO -Wl,--exclude-libs=ALL + +# Public data symbols must be interposable to allow for copy +# relocations, but otherwise we want to bind symbols at libc link +# time to eliminate startup relocations and PLT overhead. Use +# --dynamic-list rather than -Bsymbolic-functions for greater +# control over what symbols are left unbound. +tryldflag LDFLAGS_AUTO -Wl,--dynamic-list="$srcdir/dynamic.list" + +# Find compiler runtime library +test -z "$LIBCC" && tryldflag LIBCC -lgcc && tryldflag LIBCC -lgcc_eh +test -z "$LIBCC" && tryldflag LIBCC -lcompiler_rt +test -z "$LIBCC" && try_libcc=`$CC -print-libgcc-file-name 2>/dev/null` \ + && tryldflag LIBCC "$try_libcc" +test -z "$LIBCC" && try_libcc=`$CC -print-file-name=libpcc.a 2>/dev/null` \ + && tryldflag LIBCC "$try_libcc" +printf "using compiler runtime libraries: %s\n" "$LIBCC" + +# Figure out arch variants for archs with variants +SUBARCH= +t="$CFLAGS_C99FSE $CPPFLAGS $CFLAGS" + +if test "$ARCH" = "i386" ; then +printf "checking whether compiler can use ebx in PIC asm constraints... " +cat > "$tmpc" <<EOF +int foo(int x) { __asm__ ( "" : "+b"(x) ); return x; } +EOF +if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS -fPIC \ + -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then +printf "yes\n" +else +printf "no\n" +CFLAGS_AUTO="$CFLAGS_AUTO -DBROKEN_EBX_ASM" +fi +fi + +if test "$ARCH" = "x86_64" ; then +trycppif __ILP32__ "$t" && ARCH=x32 +fi + +if test "$ARCH" = "arm" ; then +if trycppif __thumb2__ "$t" ; then +tryflag CFLAGS_AUTO -mimplicit-it=always +tryflag CFLAGS_AUTO -Wa,-mimplicit-it=always +tryflag CFLAGS_AUTO -Wa,-mthumb +fi +trycppif __ARMEB__ "$t" && SUBARCH=${SUBARCH}eb +trycppif __ARM_PCS_VFP "$t" && SUBARCH=${SUBARCH}hf +# Versions of clang up until at least 3.8 have the wrong constraint codes +# for floating point operands to inline asm. Detect this so the affected +# source files can just disable the asm. +if test "$cc_family" = clang ; then +printf "checking whether clang's vfp asm constraints work... " +echo 'float f(float x) { __asm__("":"+t"(x)); return x; }' > "$tmpc" +if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then +printf "yes\n" +else +printf "no\n" +CFLAGS_AUTO="$CFLAGS_AUTO -DBROKEN_VFP_ASM" +CFLAGS_AUTO="${CFLAGS_AUTO# }" +fi +fi +fi + +if test "$ARCH" = "aarch64" ; then +trycppif __AARCH64EB__ "$t" && SUBARCH=${SUBARCH}_be +fi + +if test "$ARCH" = "m68k" ; then +if trycppif "__HAVE_68881__" ; then : ; +elif trycppif "__mcffpu__" ; then SUBARCH="-fp64" +else SUBARCH="-sf" +fi +fi + +if test "$ARCH" = "mips" ; then +trycppif "__mips_isa_rev >= 6" "$t" && SUBARCH=${SUBARCH}r6 +trycppif "_MIPSEL || __MIPSEL || __MIPSEL__" "$t" && SUBARCH=${SUBARCH}el +trycppif __mips_soft_float "$t" && SUBARCH=${SUBARCH}-sf +fi + +if test "$ARCH" = "mips64" ; then +trycppif "_MIPS_SIM != _ABI64" "$t" && ARCH=mipsn32 +trycppif "__mips_isa_rev >= 6" "$t" && SUBARCH=${SUBARCH}r6 +trycppif "_MIPSEL || __MIPSEL || __MIPSEL__" "$t" && SUBARCH=${SUBARCH}el +trycppif __mips_soft_float "$t" && SUBARCH=${SUBARCH}-sf +fi + +if test "$ARCH" = "powerpc" ; then +trycppif "_SOFT_FLOAT || __NO_FPRS__" "$t" && SUBARCH=${SUBARCH}-sf +printf "checking whether compiler can use 'd' constraint in asm... " +echo 'double f(double x) { __asm__ ("fabs %0, %1" : "=d"(x) : "d"(x)); return x; }' > "$tmpc" +if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then +printf "yes\n" +else +printf "no\n" +CFLAGS_AUTO="$CFLAGS_AUTO -DBROKEN_PPC_D_ASM" +CFLAGS_AUTO="${CFLAGS_AUTO# }" +fi +fi + +test "$ARCH" = "microblaze" && trycppif __MICROBLAZEEL__ "$t" \ +&& SUBARCH=${SUBARCH}el + +if test "$ARCH" = "powerpc64" ; then +trycppif "_CALL_ELF == 2" "$t" || fail "$0: error: unsupported powerpc64 ABI" +trycppif __LITTLE_ENDIAN__ "$t" && SUBARCH=${SUBARCH}le +trycppif _SOFT_FLOAT "$t" && fail "$0: error: soft-float not supported on powerpc64" +fi + +if test "$ARCH" = "riscv64" ; then +trycppif __riscv_float_abi_soft "$t" && SUBARCH=${SUBARCH}-sf +trycppif __riscv_float_abi_single "$t" && SUBARCH=${SUBARCH}-sp +fi + +if test "$ARCH" = "sh" ; then +tryflag CFLAGS_AUTO -Wa,--isa=any +trycppif __BIG_ENDIAN__ "$t" && SUBARCH=${SUBARCH}eb +if trycppif "__SH_FPU_ANY__ || __SH4__" "$t" ; then +# Some sh configurations are broken and replace double with float +# rather than using softfloat when the fpu is present but only +# supports single precision. Reject them. +printf "checking whether compiler's double type is IEEE double... " +echo 'typedef char dblcheck[(int)sizeof(double)-5];' > "$tmpc" +if $CC $CFLAGS_C99FSE $CPPFLAGS $CFLAGS -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then +printf "yes\n" +else +printf "no\n" +fail "$0: error: compiler's floating point configuration is unsupported" +fi +else +SUBARCH=${SUBARCH}-nofpu +fi +if trycppif __SH_FDPIC__ "$t" ; then +SUBARCH=${SUBARCH}-fdpic +fi +fi + +test "$SUBARCH" \ +&& printf "configured for %s variant: %s\n" "$ARCH" "$ARCH$SUBARCH" + +case "$ARCH$SUBARCH" in +arm) ASMSUBARCH=el ;; +*) ASMSUBARCH=$SUBARCH ;; +esac + +# +# Some archs (powerpc) have different possible long double formats +# that the compiler can be configured for. The logic for whether this +# is supported is in bits/float.h; in general, it is not. We need to +# check for mismatches here or code in printf, strotd, and scanf will +# be dangerously incorrect because it depends on (1) the macros being +# correct, and (2) IEEE semantics. +# +printf "checking whether compiler's long double definition matches float.h... " +echo '#include <float.h>' > "$tmpc" +echo '#define C(m,s) (m==LDBL_MANT_DIG && s==sizeof(long double))' >> "$tmpc" +echo 'typedef char ldcheck[(C(53,8)||C(64,12)||C(64,16)||C(113,16))*2-1];' >> "$tmpc" +if $CC $CFLAGS_C99FSE \ + -I$srcdir/arch/$ARCH -I$srcdir/arch/generic -I$srcdir/include \ + $CPPFLAGS $CFLAGS -c -o /dev/null "$tmpc" >/dev/null 2>&1 ; then +printf "yes\n" +else +printf "no\n" +fail "$0: error: unsupported long double type" +fi + +# +# Some build systems globally pass in broken CFLAGS like -ffast-math +# for all packages. On recent GCC we can detect this and error out +# early rather than producing a seriously-broken math library. +# +if trycppif "__FAST_MATH__" \ + "$CFLAGS_C99FSE $CPPFLAGS $CFLAGS" ; then +fail "$0: error: compiler has broken floating point; check CFLAGS" +fi + +printf "creating config.mak... " + +cmdline=$(quote "$0") +for i ; do cmdline="$cmdline $(quote "$i")" ; done + +exec 3>&1 1>config.mak + + +cat << EOF +# This version of config.mak was generated by: +# $cmdline +# Any changes made here will be lost if configure is re-run +AR = ${AR:-\$(CROSS_COMPILE)ar} +RANLIB = ${RANLIB:-\$(CROSS_COMPILE)ranlib} +ARCH = $ARCH +SUBARCH = $SUBARCH +ASMSUBARCH = $ASMSUBARCH +srcdir = $srcdir +prefix = $prefix +exec_prefix = $exec_prefix +bindir = $bindir +libdir = $libdir +includedir = $includedir +syslibdir = $syslibdir +CC = $CC +CFLAGS = $CFLAGS +CFLAGS_AUTO = $CFLAGS_AUTO +CFLAGS_C99FSE = $CFLAGS_C99FSE +CFLAGS_MEMOPS = $CFLAGS_MEMOPS +CFLAGS_NOSSP = $CFLAGS_NOSSP +CPPFLAGS = $CPPFLAGS +LDFLAGS = $LDFLAGS +LDFLAGS_AUTO = $LDFLAGS_AUTO +CROSS_COMPILE = $CROSS_COMPILE +LIBCC = $LIBCC +OPTIMIZE_GLOBS = $OPTIMIZE_GLOBS +ALL_TOOLS = $tools +TOOL_LIBS = $tool_libs +ADD_CFI = $ADD_CFI +MALLOC_DIR = $malloc_dir +EOF +test "x$static" = xno && echo "STATIC_LIBS =" +test "x$shared" = xno && echo "SHARED_LIBS =" +test "x$cc_family" = xgcc && echo 'WRAPCC_GCC = $(CC)' +test "x$cc_family" = xclang && echo 'WRAPCC_CLANG = $(CC)' +test "x$pic_default" = xyes && echo 'AOBJS = $(LOBJS)' +exec 1>&3 3>&- + +test "$srcdir" = "." || ln -sf $srcdir/Makefile . + +printf "done\n" |