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configure.ac
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configure.ac
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dnl Process this file with autoconf to produce a configure script.
AC_INIT
{
AC_CONFIG_AUX_DIR(tool)
AC_PREREQ(2.67)
tooldir="$srcdir/tool"
AC_DISABLE_OPTION_CHECKING
m4_define([RUBY_M4_INCLUDED], [])dnl
AC_DEFUN([RUBY_M4_INCLUDE], [m4_include([tool/m4/$1])dnl
m4_append([RUBY_M4_INCLUDED], [ \
$(tooldir)/m4/$1])dnl
])
RUBY_M4_INCLUDE([_colorize_result_prepare.m4])dnl
RUBY_M4_INCLUDE([ac_msg_result.m4])dnl
RUBY_M4_INCLUDE([colorize_result.m4])dnl
RUBY_M4_INCLUDE([ruby_append_option.m4])dnl
RUBY_M4_INCLUDE([ruby_append_options.m4])dnl
RUBY_M4_INCLUDE([ruby_check_builtin_func.m4])dnl
RUBY_M4_INCLUDE([ruby_check_builtin_setjmp.m4])dnl
RUBY_M4_INCLUDE([ruby_check_header.m4])dnl
RUBY_M4_INCLUDE([ruby_check_printf_prefix.m4])dnl
RUBY_M4_INCLUDE([ruby_check_setjmp.m4])dnl
RUBY_M4_INCLUDE([ruby_check_signedness.m4])dnl
RUBY_M4_INCLUDE([ruby_check_sizeof.m4])dnl
RUBY_M4_INCLUDE([ruby_check_sysconf.m4])dnl
RUBY_M4_INCLUDE([ruby_cppoutfile.m4])dnl
RUBY_M4_INCLUDE([ruby_decl_attribute.m4])dnl
RUBY_M4_INCLUDE([ruby_default_arch.m4])dnl
RUBY_M4_INCLUDE([ruby_define_if.m4])dnl
RUBY_M4_INCLUDE([ruby_defint.m4])dnl
RUBY_M4_INCLUDE([ruby_dtrace_available.m4])dnl
RUBY_M4_INCLUDE([ruby_dtrace_postprocess.m4])dnl
RUBY_M4_INCLUDE([ruby_func_attribute.m4])dnl
RUBY_M4_INCLUDE([ruby_mingw32.m4])dnl
RUBY_M4_INCLUDE([ruby_prepend_option.m4])dnl
RUBY_M4_INCLUDE([ruby_prog_gnu_ld.m4])dnl
RUBY_M4_INCLUDE([ruby_prog_makedirs.m4])dnl
RUBY_M4_INCLUDE([ruby_replace_funcs.m4])dnl
RUBY_M4_INCLUDE([ruby_replace_type.m4])dnl
RUBY_M4_INCLUDE([ruby_require_funcs.m4])dnl
RUBY_M4_INCLUDE([ruby_rm_recursive.m4])dnl
RUBY_M4_INCLUDE([ruby_setjmp_type.m4])dnl
RUBY_M4_INCLUDE([ruby_shared_gc.m4])dnl
RUBY_M4_INCLUDE([ruby_stack_grow_direction.m4])dnl
RUBY_M4_INCLUDE([ruby_thread.m4])dnl
RUBY_M4_INCLUDE([ruby_try_cflags.m4])dnl
RUBY_M4_INCLUDE([ruby_try_cxxflags.m4])dnl
RUBY_M4_INCLUDE([ruby_try_ldflags.m4])dnl
RUBY_M4_INCLUDE([ruby_universal_arch.m4])dnl
RUBY_M4_INCLUDE([ruby_wasm_tools.m4])dnl
RUBY_M4_INCLUDE([ruby_werror_flag.m4])dnl
AS_IF([test "x${GITHUB_ACTIONS}" = xtrue],
[AC_REQUIRE([_COLORIZE_RESULT_PREPARE])dnl
dnl 93(bright yellow) is copied from .github/workflows/mingw.yml
begin_group() { AS_ECHO(["::group::@<:@93m$[]1@<:@m"]);}
end_group() { AS_ECHO(["::endgroup::"]);}
],
[dnl
begin_group() { :;}
end_group() { :;}
])
AC_ARG_VAR([cflags], [additional CFLAGS (ignored when CFLAGS is given)])dnl
AC_ARG_VAR([cppflags], [additional CPPFLAGS (ignored when CPPFLAGS is given)])dnl
AC_ARG_VAR([cxxflags], [additional CXXFLAGS (ignored when CXXFLAGS is given)])dnl
[begin]_group "environment section" && {
HAVE_BASERUBY=yes
BASERUBY_VERSION=
AC_ARG_WITH(baseruby,
AS_HELP_STRING([--with-baseruby=RUBY], [use RUBY as baseruby; RUBY is the pathname of ruby]),
[AS_CASE(["$withval"],
[*ruby*],[BASERUBY=$withval],
[no],[HAVE_BASERUBY=no],
[AC_MSG_ERROR(need ruby)])
],
[
AC_PATH_PROG([BASERUBY], [ruby], [false])
])
AS_IF([test "$HAVE_BASERUBY" != no], [
RUBYOPT=- $BASERUBY --disable=gems "${tooldir}/missing-baseruby.bat" || HAVE_BASERUBY=no
])
AS_IF([test "${HAVE_BASERUBY:=no}" != no], [
AS_CASE(["$build_os"], [mingw*], [
# Can MSys shell run a command with a drive letter?
RUBYOPT=- `cygpath -ma "$BASERUBY"` --disable=gems -e exit 2>/dev/null || HAVE_BASERUBY=no
])
RUBY_APPEND_OPTION(BASERUBY, "--disable=gems")
BASERUBY_VERSION=`$BASERUBY -v`
$BASERUBY -C "$srcdir" tool/downloader.rb -d tool -e gnu config.guess config.sub >&AS_MESSAGE_FD
])
AS_IF([test "$HAVE_BASERUBY" = no], [
AS_IF([test "$cross_compiling" = yes], [AC_MSG_ERROR([executable host ruby is required for cross-compiling])])
BASERUBY=${tooldir}/missing-baseruby.bat
])
AC_SUBST(BASERUBY)
AC_SUBST(HAVE_BASERUBY)
: ${GIT=git}
HAVE_GIT=yes
AC_ARG_WITH(git,
AS_HELP_STRING([--without-git], [never use git]),
[AS_CASE([$withval],
[no], [GIT=never-use HAVE_GIT=no],
[yes], [],
[GIT=$withval])])
AS_IF([test x"$HAVE_GIT" = xyes], [command -v "$GIT" > /dev/null || HAVE_GIT=no])
AC_SUBST(GIT)
AC_SUBST(HAVE_GIT)
eval `sed -n -e ['s/^@%:@define RUBY_[A-Z_]*VERSION_\([A-Z][A-Z][A-Z_0-9]*\) \([0-9][0-9]*\)$/\1=\2/p'] \
-e ['s/^@%:@define \(RUBY_ABI_VERSION\) \([0-9][0-9]*\).*/\1=\2/p'] \
-e ['s/^@%:@define \(RUBY_PATCHLEVEL\) \(.*\)/\1=\2/p'] \
$srcdir/include/ruby/internal/abi.h \
$srcdir/include/ruby/version.h $srcdir/version.h`
for v in MAJOR MINOR TEENY; do
AS_IF([eval "test \"\$$v\" = ''"], [
AC_MSG_ERROR(could not determine $v number from version.h)
])
done
AC_SUBST(MAJOR)
AC_SUBST(MINOR)
AC_SUBST(TEENY)
AC_SUBST(RUBY_API_VERSION, '$(MAJOR).$(MINOR)')
AC_SUBST(RUBY_PROGRAM_VERSION, '$(MAJOR).$(MINOR).$(TEENY)')
AS_CASE([$RUBY_PATCHLEVEL], [-*], [
AC_DEFINE_UNQUOTED(RUBY_ABI_VERSION, [${RUBY_ABI_VERSION}])
], [RUBY_ABI_VERSION=])
AS_IF([test "$program_prefix" = NONE], [
program_prefix=
])
AS_IF([test "$prefix" -ef .], [
AC_MSG_ERROR(--prefix cannot be the current working directory.)
])
RUBY_BASE_NAME=`echo ruby | sed "$program_transform_name"`
RUBYW_BASE_NAME=`echo rubyw | sed "$program_transform_name"`
AC_SUBST(RUBY_BASE_NAME)
AC_SUBST(RUBYW_BASE_NAME)
AC_SUBST(RUBY_VERSION_NAME, '${RUBY_BASE_NAME}-${ruby_version}')
dnl checks for alternative programs
AC_CANONICAL_BUILD
AC_CANONICAL_HOST
AC_CANONICAL_TARGET
AS_CASE(["$target_cpu-$target_os"],
[aarch64-darwin*], [
target_cpu=arm64
AS_CASE(["$target_vendor"], [unknown], [
target_vendor=apple
target=${target%%-unknown-*}-apple-${target@%:@*-unknown-}
])
target="arm64-${target@%:@aarch64-}"
AS_IF([test -n "$target_alias"], [target_alias="arm64-${target_alias@%:@aarch64-}"])
])
AC_ARG_PROGRAM
RUBY_RM_RECURSIVE
AC_ARG_WITH(gcc,
AS_HELP_STRING([--without-gcc], [never use gcc]),
[
AS_CASE([$withval],
[no], [: ${CC=cc}],
[yes], [: ${CC=gcc}],
[CC=$withval])])
dnl If the user switches compilers, we can't believe the cache
AS_IF([test ! -z "$ac_cv_prog_CC" -a ! -z "$CC" -a "$CC" != "$ac_cv_prog_CC"], [
AC_MSG_ERROR(cached CC is different -- throw away $cache_file
(it is also a good idea to do 'make clean' before compiling))
])
RUBY_WASM_TOOLS
AS_CASE(["${build_os}"],
[linux*|cygwin*|msys*], [
# Naruse prefers GCC on Linux
AC_CHECK_TOOLS([CC], [gcc clang cc])
],
[solaris*], [
# Clang on Solaris is largely untested.
# https://bugs.ruby-lang.org/issues/17949
AC_CHECK_TOOLS([CC], [cc gcc])
], [
# OpenBSD wants to prefer cc over gcc.
# See https://github.com/ruby/ruby/pull/2443
AC_CHECK_TOOLS([CC], [cl.exe clang cc gcc c99 /usr/ucb/cc])
])
AC_ARG_VAR([AR], [Archiver command])
AC_ARG_VAR([AS], [Assembler command])
AC_ARG_VAR([CC], [C compiler command])
AC_ARG_VAR([CXX], [C++ compiler command])
AC_ARG_VAR([LD], [Linker command])
AC_ARG_VAR([NM], [Symbol list command])
AC_ARG_VAR([OBJCOPY], [Objcopy command])
AC_ARG_VAR([OBJDUMP], [Objdump command])
AC_ARG_VAR([RANLIB], [Ranlib command])
AC_ARG_VAR([STRIP], [Strip command])
# We don't want to bother things like `ccache gcc`, `clang -shared-libgcc`, ...
set rb_dummy ${CC}
rb_CC=$2
AC_DEFUN([RUBY_CHECK_PROG_FOR_CC], [
rb_prog=`echo "${rb_CC}" | sed "$2"`
AC_CHECK_PROG([$1], [$rb_prog], [$rb_prog])
])
AS_CASE(["/${rb_CC} "],
[*@<:@\ /@:>@"cc "*], [
# Don't try g++/clang++ when CC=cc
AC_CHECK_PROGS([CXX], [cl.exe CC c++])
],
[*icc*], [
# Intel C++ has interprocedural optimizations. It tends to come with its
# own linker etc.
RUBY_CHECK_PROG_FOR_CC([AR], [s/icc/xiar/])
RUBY_CHECK_PROG_FOR_CC([CXX], [s/icc/icpc/])
RUBY_CHECK_PROG_FOR_CC([LD], [s/icc/xild/])
],
[*gcc*], [
# Ditto for GCC.
RUBY_CHECK_PROG_FOR_CC([LD], [s/gcc/ld/])
RUBY_CHECK_PROG_FOR_CC([AR], [s/gcc/gcc-ar/])
RUBY_CHECK_PROG_FOR_CC([CXX], [s/gcc/g++/])
RUBY_CHECK_PROG_FOR_CC([NM], [s/gcc/gcc-nm/])
RUBY_CHECK_PROG_FOR_CC([RANLIB], [s/gcc/gcc-ranlib/])
],
[*clang*], [
# Ditto for LLVM. Note however that llvm-as is a LLVM-IR to LLVM bitcode
# assembler that does not target your machine native binary.
# Xcode has its own version tools that may be incompatible with
# genuine LLVM tools, use the tools in the same directory.
AS_IF([$rb_CC -E -dM -xc - < /dev/null | grep -F __apple_build_version__ > /dev/null],
[llvm_prefix=], [llvm_prefix=llvm-])
# AC_PREPROC_IFELSE cannot be used before AC_USE_SYSTEM_EXTENSIONS
RUBY_CHECK_PROG_FOR_CC([LD], [s/clang/ld/]) # ... maybe try lld ?
RUBY_CHECK_PROG_FOR_CC([AR], [s/clang/${llvm_prefix}ar/])
# RUBY_CHECK_PROG_FOR_CC([AS], [s/clang/${llvm_prefix}as/])
RUBY_CHECK_PROG_FOR_CC([CXX], [s/clang/clang++/])
RUBY_CHECK_PROG_FOR_CC([NM], [s/clang/${llvm_prefix}nm/])
RUBY_CHECK_PROG_FOR_CC([OBJCOPY], [s/clang/${llvm_prefix}objcopy/])
RUBY_CHECK_PROG_FOR_CC([OBJDUMP], [s/clang/${llvm_prefix}objdump/])
RUBY_CHECK_PROG_FOR_CC([RANLIB], [s/clang/${llvm_prefix}ranlib/])
RUBY_CHECK_PROG_FOR_CC([STRIP], [s/clang/${llvm_prefix}strip/])
])
AS_UNSET(rb_CC)
AS_UNSET(rb_dummy)
AS_CASE(["${build_os}"],
[solaris*], [
AC_PATH_TOOL([LD], [ld], [/usr/ccs/bin/ld], [/usr/ccs/bin:$PATH])
],
[aix*], [
AC_PATH_TOOL([NM], [nm], [/usr/ccs/bin/nm], [/usr/ccs/bin:$PATH])
])
AS_CASE(["${target_os}"],
[cygwin*|msys*|mingw*|darwin*], [
ac_cv_prog_ac_ct_OBJCOPY=":"
])
rb_test_CFLAGS=${CFLAGS+yes}
rb_test_CXXFLAGS=${CXXFLAGS+yes}
# BSD's ports and MacPorts prefix GNU binutils with 'g'
dnl Seems necessarily in order to add -std=gnu99 option for gcc 4.9.
m4_version_prereq([2.70], [AC_PROG_CC], [AC_PROG_CC_C99])
AC_PROG_CXX
AC_PROG_CPP
AC_PROG_RANLIB
AC_CHECK_TOOLS([AR], [gar ar])
AC_CHECK_TOOLS([AS], [gas as])
AC_CHECK_TOOLS([LD], [gld ld]) # ... try gold ?
AC_CHECK_TOOLS([NM], [gnm nm])
AC_CHECK_TOOLS([OBJCOPY], [gobjcopy objcopy], [:])
AC_CHECK_TOOLS([OBJDUMP], [gobjdump objdump])
AC_CHECK_TOOLS([STRIP], [gstrip strip], [:])
# nm errors with Rust's LLVM bitcode when Rust uses a newer LLVM version than nm.
# In case we're working with llvm-nm, tell it to not worry about the bitcode.
AS_IF([${NM} --help 2>&1 | grep -q 'llvm-bc'], [NM="$NM --no-llvm-bc"])
AS_IF([test ! $rb_test_CFLAGS], [AS_UNSET(CFLAGS)]); AS_UNSET(rb_test_CFLAGS)
AS_IF([test ! $rb_test_CXXFLAGS], [AS_UNSET(CXXFLAGS)]); AS_UNSET(rb_save_CXXFLAGS)
AS_IF([test "${CXX}" = "g++" -a -z "${GXX}"], [
# AC_PROG_CXX sets $CXX to "g++" when it purposefully finds that there is
# _no_ g++. This brain-damaged design must be worked around. Thankfully,
# similar thing doesn't happen for AC_PROG_CC.
rb_there_is_in_fact_no_gplusplus_but_autoconf_is_cheating_us=true
])
test x"$target_alias" = x &&
target_os=`echo $target_os | sed 's/linux-gnu$/linux/;s/linux-gnu/linux-/'`
ac_install_sh='' # unusable for extension libraries.
AC_ARG_WITH(os-version-style,
AS_HELP_STRING([--with-os-version-style=TYPE],
[OS version number for target and target_os [[full]]]
[(full|teeny|minor+0|minor|major+0|major|none)]),
[os_version_style=$withval],
[os_version_style=full
AS_CASE($target_os, [[*[0-9].*]],
[AS_CASE([`/usr/bin/ruby -e 'puts RUBY_PLATFORM' 2>/dev/null`],
[[*-*[0-9].*.0]], [os_version_style=minor+0],
[[*-*[0-9].*.*]], [os_version_style=full],
[[*-*[0-9].0] ], [os_version_style=major+0],
[[*-*[0-9].*] ], [os_version_style=minor],
[[*-*[0-9]] ], [os_version_style=major],
)])
])
os_version_style_transform=
AS_CASE("${os_version_style}",
[full|teeny], [],
[minor+0], [os_version_style_transform=['s/\([0-9]\.[0-9][0-9]*\)\.[0-9][.0-9]*$/\1.0/']],
[minor], [os_version_style_transform=['s/\([0-9]\.[0-9][0-9]*\)\.[0-9][.0-9]*$/\1/']],
[major+0], [os_version_style_transform=['s/\([0-9]\)\.[0-9][.0-9]*$/\1.0/']],
[major], [os_version_style_transform=['s/\([0-9]\)\.[0-9][.0-9]*$/\1/']],
[none], [os_version_style_transform=['s/[0-9]*\.[0-9][.0-9]*$//']],
[AC_MSG_ERROR(unknown --with-os-version-style: $withval)])
AS_IF([test -z "$target_alias" -a -n "$os_version_style_transform"],
[
target=`echo ${target} | sed "$os_version_style_transform"`
target_os=`echo ${target_os} | sed "$os_version_style_transform"`
])
AC_ARG_WITH(arch,
AS_HELP_STRING([--with-arch=ARCHS],
[build an Apple/NeXT Multi Architecture Binary (MAB);
ARCHS is a comma-delimited list of architectures for
which to build; if this option is disabled or omitted
entirely, then the package will be built only for the
target platform]),
[target_archs="$withval"], [unset target_archs])
AC_ARG_ENABLE(load-relative,
AS_HELP_STRING([--enable-load-relative], [resolve load paths at run time]),
[load_relative=$enableval])
# checks for UNIX variants that set C preprocessor variables
AC_USE_SYSTEM_EXTENSIONS
dnl Checks for programs.
cflagspat=
test -z "$optflags" ||
cflagspat="$cflagspat;s|"`eval echo '"'"${optflags}"'"' | sed 's/[[][|.*]]/\\&/g;s/^ */ /;s/ *$/ /'`'| |g'
test -z "$debugflags" ||
cflagspat="$cflagspat;s|"`eval echo '"'"${debugflags}"'"' | sed 's/[[][|.*]]/\\&/g;s/^ */ /;s/ *$/ /'`'| |g'
test -z "$warnflags" ||
cflagspat="$cflagspat;s|"`eval echo '"'"${warnflags}"'"' | sed 's/[[][|.*]]/\\&/g;s/^ */ /;s/ *$/ /'`'| |g'
AS_IF([test -z "${CFLAGS+set}"], [
cflags=`echo " $cflags " | sed "$cflagspat;s/^ *//;s/ *$//"`
orig_cflags="$cflags"
cflags="$cflags "'${optflags} ${debugflags} ${warnflags}'
])
dnl AS_IF([test -z "${CXXFLAGS+set}"], [
dnl cxxflags=`echo " $cxxflags " | sed "$cflagspat;s/^ *//;s/ *$//"`
dnl orig_cxxflags="$cxxflags"
dnl cxxflags="$cxxflags "'${optflags} ${debugflags} ${warnflags}'
dnl ])
AS_CASE(["$host_os:$build_os"],
[darwin*:darwin*], [
# Following Apple deployed clang are broken
# clang version 1.0 (http://llvm.org/svn/llvm-project/cfe/tags/Apple/clang-23 exported)
# Apple clang version 2.0 (tags/Apple/clang-137) (based on LLVM 2.9svn)
# Apple clang version 2.1 (tags/Apple/clang-163.7.1) (based on LLVM 3.0svn)
AC_PREPROC_IFELSE(
[AC_LANG_PROGRAM([
@%:@if defined __APPLE_CC__ && defined __clang_major__ && __clang_major__ < 3
@%:@error premature clang
@%:@endif
])],
[],
[AC_MSG_ERROR([clang version 3.0 or later is required])])
])
AS_CASE(["$target_os"],
[darwin*], [
AC_MSG_CHECKING(if minimum required OS X version is supported)
AC_PREPROC_IFELSE([AC_LANG_SOURCE([[@%:@include <AvailabilityMacros.h>
@%:@if MAC_OS_X_VERSION_MIN_REQUIRED < __MAC_10_5
@%:@error pre OS X 10.5
[!<===== pre OS X 10.5 =====>]
@%:@endif
]])],
[AC_MSG_RESULT(yes)],
[AC_MSG_RESULT(no)
AC_MSG_ERROR([Unsupported OS X version is required])])
])
RUBY_MINGW32
AC_SUBST(GCC)
AC_SUBST(LD)
AS_IF([test "$GCC" = yes], [
linker_flag=-Wl,
: ${optflags=-O3}
gcc_major=`echo =__GNUC__ | $CC -E -xc - | sed '/^=/!d;s///'`
gcc_minor=`echo =__GNUC_MINOR__ | $CC -E -xc - | sed '/^=/!d;s///'`
test -n "$gcc_major" || gcc_major=0
test -n "$gcc_minor" || gcc_minor=0
icc_version=`echo =__ICC | $CC -E -xc - | sed '/^=/!d;s///;/^__ICC/d'`
test -n "$icc_version" || icc_version=0
# RUBY_APPEND_OPTIONS(XCFLAGS, ["-include ruby/config.h" "-include ruby/missing.h"])
AS_IF([test "$gcc_major" -lt 4], [
AC_MSG_ERROR([too old GCC: $gcc_major.$gcc_minor])
])
], [
linker_flag=
])
RUBY_PROG_GNU_LD
RUBY_CPPOUTFILE
: ${OUTFLAG='-o '}
: ${COUTFLAG=${OUTFLAG}}
: ${CSRCFLAG=''}
AC_SUBST(OUTFLAG)
AC_SUBST(COUTFLAG)
AC_SUBST(CSRCFLAG)
AS_CASE(["$build_os"],
[darwin*], [
# gcc 13 warns duplicate -l options, which are added by the
# default spec.
# Xcode linker warns for deprecated architecture and wrongly
# installed TBD files.
AC_MSG_CHECKING(for $CC linker warning)
suppress_ld_waring=no
echo 'int main(void) {return 0;}' > conftest.c
AS_IF([$CC -framework Foundation -o conftest conftest.c 2>&1 |
grep \
-e '^ld: warning: ignoring duplicate libraries:' \
-e '^ld: warning: text-based stub file' \
-e '^ld: warning: -multiply_defined is obsolete' \
>/dev/null], [
suppress_ld_waring=yes
])
rm -fr conftest*
test $suppress_ld_waring = yes && warnflags="${warnflags:+${warnflags} }-Wl,-w"
AC_MSG_RESULT($suppress_ld_waring)
])
AS_CASE(["$target_os"],
[wasi*], [
# Clang linker automatically uses wasm-opt with -O if it found.
# https://github.com/llvm/llvm-project/blob/812828984c10857a4cd260eb638c52a4411f9143/clang/lib/Driver/ToolChains/WebAssembly.cpp#L95-L118
# However optimization before asyncify causes misoptimization,
# so wrap clang to insert our fake wasm-opt, which does nothing, in PATH.
CC_WRAPPER=`cd -P "${tooldir}" && pwd`/wasm-clangw
CC="$CC_WRAPPER $CC"
])
cc_version=
for option in --version -v -V -qversion; do
cc_version_message=`$CC $option 2>&1`
cc_version_status=$?
AS_CASE($cc_version_status, [0], [:], [continue])
AS_CASE($cc_version_message, [*Warning*], [continue])
cc_version='$(CC) '$option
break
done
AC_SUBST(CC_VERSION, $cc_version)
AC_SUBST(CC_VERSION_MESSAGE, $cc_version_message)
: ${DLDFLAGS="$LDFLAGS"}
RUBY_UNIVERSAL_ARCH
AS_IF([test "$target_cpu" != "$host_cpu" -a "$GCC" = yes -a "${universal_binary:-no}" = no], [
RUBY_DEFAULT_ARCH($target_cpu)
])
host_os=$target_os
host_vendor=$target_vendor
host_cpu=$target_cpu
host=$target
host_alias=$target_alias
AC_CACHE_CHECK([for $AR flags], [rb_cv_arflags], [
AS_IF([$AR rcD conftest.a > /dev/null 2>&1 && rm conftest.a],
[rb_cv_arflags=rcD], [rb_cv_arflags=rcu])
])
AC_SUBST(ARFLAGS, ["$rb_cv_arflags "])
AC_SUBST(ASFLAGS)
AS_CASE(["$target_os"],
[cygwin*|msys*|mingw*], [
AC_CHECK_TOOL(WINDRES, windres)
AC_CHECK_TOOL(DLLWRAP, dllwrap)
target=`echo $target | sed "s/^$target_cpu-/-/"`
target_alias=`echo $target_alias | sed "s/^$target_cpu-/-/"`
target_cpu=`echo $target_cpu | sed s/i.86/i386/`
AS_CASE(["$target"], [-*], [ target="$target_cpu${target}"])
AS_CASE(["$target_alias"], [-*], [ target_alias="$target_cpu${target_alias}"])
AS_CASE(["$target_os"],
[mingw*], [
test "$rb_cv_msvcrt" = "" && unset rb_cv_msvcrt
AC_CACHE_CHECK(for mingw32 runtime DLL, rb_cv_msvcrt, [
AC_LINK_IFELSE([AC_LANG_PROGRAM([[@%:@include <stdio.h>]],
[[FILE* volatile f = stdin; return 0;]])],
[rb_cv_msvcrt=`$OBJDUMP -p conftest$ac_exeext |
tr A-Z a-z |
sed -n '/^[[ ]]*dll name: \(msvc.*\)\.dll$/{s//\1/p;q;};
/^[[ ]]*dll name: \(ucrtbase\|api-ms-win-crt-.*\)\.dll$/{s//ucrt/p;q;}'`],
[rb_cv_msvcrt=msvcrt])
test "$rb_cv_msvcrt" = "" && rb_cv_msvcrt=msvcrt])
RT_VER=`echo "$rb_cv_msvcrt" | tr -cd [0-9]`
test "$RT_VER" = "" && RT_VER=60
test "$rb_cv_msvcrt" = "ucrt" && RT_VER=140
AC_DEFINE_UNQUOTED(RUBY_MSVCRT_VERSION, $RT_VER)
sysconfdir=
])
rb_cv_binary_elf=no
: ${enable_shared=yes}
AS_IF([$WINDRES --version | grep LLVM > /dev/null], [USE_LLVM_WINDRES=yes], [USE_LLVM_WINDRES=no])
],
[hiuxmpp*], [AC_DEFINE(__HIUX_MPP__)]) # by TOYODA Eizi <toyoda@npd.kishou.go.jp>
AC_PROG_LN_S
AC_PROG_MAKE_SET
AC_PROG_INSTALL
AS_CASE(["$target_os"],[openbsd*],[
ac_cv_path_mkdir="mkdir"
])
RUBY_PROG_MAKEDIRS
AC_CHECK_PROG([DTRACE], [${ac_tool_prefix}dtrace], [${ac_tool_prefix}dtrace])
AS_IF([test "$cross_compiling:$ac_cv_prog_DTRACE" = no: -a -n "$ac_tool_prefix"], [
AC_CHECK_PROG([DTRACE], [dtrace], [dtrace])
])
AC_CHECK_PROGS(DOT, dot)
AC_CHECK_PROGS(DOXYGEN, doxygen)
tool_warned=$ac_tool_warned ac_tool_warned=no
AC_CHECK_TOOL(PKG_CONFIG, pkg-config)
ac_tool_warned=$tool_warned
AS_IF([test -z "$PKG_CONFIG"], [],
["$PKG_CONFIG" --print-errors --version > /dev/null 2>&1], [],
[
unset ac_cv_prog_PKG_CONFIG
PKG_CONFIG=
AC_MSG_WARN([$PKG_CONFIG does not work; ignore])
])
AC_MSG_CHECKING([whether it is Android])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
@%:@ifndef __ANDROID__
@%:@error Not android
@%:@endif
]], [[]])],
[
AC_MSG_RESULT(yes)
target_os=${target_os}-android
AS_IF([test "x$cross_compiling" = xno], [
AC_MSG_CHECKING([for Android API version])
# hacky workaround: https://github.com/termux/termux-packages/issues/6176
rb_android_api=`getprop ro.build.version.sdk`
AC_MSG_RESULT($rb_android_api)
RUBY_APPEND_OPTIONS(CPPFLAGS, -D__ANDROID_API__=$rb_android_api -Wno-macro-redefined)
])
],
[AC_MSG_RESULT(no)])
AC_SUBST(RM, ['rm -f'])
AC_SUBST(CP, ['cp'])
RMDIRS='$(top_srcdir)/tool/rmdirs'
RMDIR=rmdir
mkdir "rmdirs_$$_test" "rmdirs_$$_test/a"
rmdir --ignore-fail-on-non-empty "rmdirs_$$_test" 2>/dev/null &&
RMDIR='rmdir --ignore-fail-on-non-empty'
$RMDIR -p "rmdirs_$$_test/a" 2>/dev/null &&
{ test -d "rmdirs_$$_test" || RMDIRS="$RMDIR -p"; }
rmdir "rmdirs_$$_test/a" "rmdirs_$$_test" 2>/dev/null
AC_SUBST(RMDIR)
AC_SUBST(RMDIRS)
AC_SUBST(RMALL, ['rm -fr'])
AC_MSG_CHECKING([for cd using physical directory])
rm -fr conf$$.dir
mkdir conf$$.dir &&
(cd conf$$.dir && mkdir src build && cd src &&
$as_ln_s ../build . > /dev/null 2>&1 && cd build &&
for chdir in 'cd -P' 'PWD= cd'; do
/bin/sh -c "$chdir ../src && echo '$chdir' > cdcmd" 2> /dev/null && break
done)
AS_IF([test -f conf$$.dir/src/cdcmd], [
read CHDIR < conf$$.dir/src/cdcmd 2> /dev/null
], [
CHDIR=cd
])
rm -fr conf$$.dir
AC_MSG_RESULT([$CHDIR])
AC_SUBST(CHDIR)
}
[begin]_group "compiler section" && {
RUBY_WERROR_FLAG([
AC_MSG_CHECKING([whether CFLAGS is valid])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[]])],
[AC_MSG_RESULT(yes)],
[
AC_MSG_RESULT(no)
AC_MSG_ERROR([something wrong with CFLAGS="$CFLAGS"])
]
)
AC_MSG_CHECKING([whether LDFLAGS is valid])
{
mkdir tmp.$$.try_link &&
cd tmp.$$.try_link &&
cp ../confdefs.h . &&
echo '<?xml?><plist><dict><key>CFBundleIdentifier</key><string></string></dict></plist>' > Info.plist &&
:
} || AC_MSG_ERROR([failed to make temporary directory])
AC_LINK_IFELSE([AC_LANG_PROGRAM([[]], [[]])],
[AC_MSG_RESULT(yes)],
[
cd .. && rm -fr tmp.$$.try_link
AC_MSG_RESULT(no)
AC_MSG_ERROR([something wrong with LDFLAGS="$LDFLAGS"])
]
)
cd .. && rm -fr tmp.$$.try_link
])
: "rpath" && {
AC_CACHE_CHECK(whether ELF binaries are produced, rb_cv_binary_elf,
[AC_LINK_IFELSE([AC_LANG_PROGRAM([[]], [[]])],[
AS_CASE(["`head -1 conftest$EXEEXT | tr -dc '\177ELF' | tr '\177' .`"],
[.ELF*], [rb_cv_binary_elf=yes], [rb_cv_binary_elf=no])],
[rb_cv_binary_elf=no])])
rpathflag=''
AS_IF([test x"${RPATHFLAG=}" = x], [
AS_CASE(["$target_os"],
[aix*], [rpathflag='-blibpath:'],
[for rpathflag in "-rpath " -R; do
AS_CASE("$rpathflag",
[*" "], [AS_CASE(["${linker_flag}"],
[*,], [rpathflag=`echo "$rpathflag" | tr ' ' ,`])])
rpathflag="${linker_flag}${rpathflag}"
RUBY_TRY_LDFLAGS([${rpathflag}.], [], [rpathflag=])
AS_IF([test "x${rpathflag}" != x], [break])
done])
], [
rpathflag=`echo "$RPATHFLAG" | sed 's/%.*//'`
])
AC_ARG_ENABLE(rpath,
AS_HELP_STRING([--enable-rpath], [embed run path into extension libraries.
enabled by default on ELF platforms]),
[enable_rpath=$enableval], [enable_rpath="$rb_cv_binary_elf"])
AS_IF([test "$enable_rpath:${RPATHFLAG}" = yes:], [
RPATHFLAG="${rpathflag:+ ${rpathflag}%1\$-s}"
])
AS_CASE([${RPATHFLAG}],[*'%1$'*],[: ${LIBPATHFLAG=' -L%1$-s'}],[: ${LIBPATHFLAG=' -L%s'}])
}
RUBY_TRY_LDFLAGS(-fdeclspec, [fdeclspec=yes], [fdeclspec=no])
AS_IF([test "$fdeclspec" = yes], [
RUBY_APPEND_OPTIONS(CFLAGS, -fdeclspec)
RUBY_APPEND_OPTIONS(cflags, -fdeclspec)
RUBY_APPEND_OPTIONS(orig_cflags, -fdeclspec)
])
RUBY_TRY_CXXFLAGS(-fdeclspec, [fdeclspec=yes], [fdeclspec=no])
AS_IF([test "$fdeclspec" = yes], [
RUBY_APPEND_OPTIONS(CXXFLAGS, -fdeclspec)
])
AC_ARG_ENABLE(devel,
AS_HELP_STRING([--enable-devel], [enable development build]),
[RUBY_DEVEL=$enableval],
[AS_IF([test "x${RUBY_DEVEL-no}" != xyes], [RUBY_DEVEL=])]
)dnl
AC_SUBST(RUBY_DEVEL)
particular_werror_flags=${RUBY_DEVEL:-no}
AC_ARG_ENABLE(werror,
AS_HELP_STRING([--disable-werror],
[don't make warnings into errors
even if a compiler support -Werror feature
[[disabled by default unless development version]]]),
[particular_werror_flags=$enableval])
rb_cv_warnflags="$warnflags"
AS_CASE(["$GCC:${warnflags+set}:${extra_warnflags:+set}:"],
[yes::*|yes:*:set:], [# GCC && (!warnflags || extra_warnflags)
AS_IF([test $gcc_major -le 6], [
extra_warnflags="$extra_warnflags -Wno-maybe-uninitialized"
])
AS_CASE([ $CFLAGS ], [*" -save-temps="*|*" -save-temps "*], [], [
extra_warnflags="$extra_warnflags -Werror=misleading-indentation"
])
# ICC doesn't support -Werror=
AS_IF([test $icc_version -gt 0], [
particular_werror_flags=no
])
for wflag in \
-Werror=extra-tokens \
-Werror=deprecated-declarations \
-Werror=division-by-zero -Werror=div-by-zero \
-Werror=duplicated-cond \
-Werror=implicit-function-declaration \
-Werror=implicit-int \
-Werror=pointer-arith \
-Werror=shorten-64-to-32 \
-Werror=write-strings \
-Werror=old-style-definition \
-Wimplicit-fallthrough=0 \
-Wmissing-noreturn \
-Wno-cast-function-type \
-Wno-constant-logical-operand \
-Wno-long-long \
-Wno-missing-field-initializers \
-Wno-overlength-strings \
-Wno-packed-bitfield-compat \
-Wno-parentheses-equality \
-Wno-self-assign \
-Wno-tautological-compare \
-Wno-unused-parameter \
-Wno-unused-value \
-Wsuggest-attribute=format \
-Wsuggest-attribute=noreturn \
-Wunused-variable \
-diag-disable=175,188,1684,2259,2312 \
$extra_warnflags \
; do
AS_IF([test "$particular_werror_flags" != yes], [
wflag=`echo x$wflag | sed 's/^x-Werror=/-W/;s/^x//'`
])
ok=no
RUBY_TRY_CFLAGS($wflag, [
RUBY_APPEND_OPTIONS(warnflags, $wflag)
ok=yes
])
AS_CASE([$ok:$wflag], [no:-Werror=*], [
wflag=`echo x$wflag | sed 's/^x-Werror=/-W/'`
RUBY_TRY_CFLAGS($wflag, [
RUBY_APPEND_OPTIONS(warnflags, $wflag)
particular_werror_flags=no
])
])
done
AS_IF([test "$particular_werror_flags" = "yes"], [
wflag=-Werror=undef
], [
wflag=-Wundef
])
RUBY_TRY_CFLAGS($wflag, [
RUBY_APPEND_OPTIONS(warnflags, $wflag)
], [], [
@%:@if !defined(RUBY_CONFIG_TEST_NEVER_DEFINED_SYMBOL)
@%:@elif RUBY_CONFIG_TEST_NEVER_DEFINED_SYMBOL
@%:@endif
])
AS_CASE([" $warnflags "],[*" -Wno-missing-field-initializers "*], [wflag="-Wall -Wextra"],
[wflag=-Wall])
RUBY_TRY_CFLAGS($wflag, [warnflags="$wflag${warnflags+ $warnflags}"])
# Disable warnflags while conftest. -Werror=* flags might make bad OS capability guess.
rb_cv_warnflags="$warnflags"
warnflags=
])
RUBY_TRY_CFLAGS(-Qunused-arguments, [RUBY_APPEND_OPTIONS(rb_cv_wsuppress_flags, -Qunused-arguments)])
AC_COMPILE_IFELSE([
AC_LANG_PROGRAM([
@%:@if !(defined(__SUNPRO_C)||defined(__SUNPRO_CC))
@%:@error not sunpro
@%:@endif],[])], [
for e in \
E_STATEMENT_NOT_REACHED \
E_INIT_SIGN_EXTEND \
E_INIT_DOES_NOT_FIT \
E_INITIALIZATION_TYPE_MISMATCH
do
RUBY_TRY_CFLAGS([-erroff=${e}], [
RUBY_APPEND_OPTIONS(rb_cv_warnflags, [-erroff=${e}])
])
done
])
AC_ARG_WITH(compress-debug-sections,
AS_HELP_STRING([--with-compress-debug-sections=type],
[enable debug section compression]),
[compress_debug_sections=$withval], [compress_debug_sections=])
AS_IF([test "$GCC" = yes], [
# -D_FORTIFY_SOURCE
# When defined _FORTIFY_SOURCE, glibc enables some additional sanity
# argument check. The performance drop is very little and Ubuntu enables
# _FORTIFY_SOURCE=2 by default. So, let's support it for protecting us from
# a mistake of silly C extensions.
# TODO: check if link succeeds with _FORTIFY_SOURCE=2.
AS_CASE(["$target_os"],
[mingw*], [
fortify_source=no
])
AC_ARG_ENABLE(fortify_source,
AS_HELP_STRING([--disable-fortify-source],
[disable -D_FORTIFY_SOURCE=2 option, which causes link error on mingw]),
[fortify_source=$enableval])
AS_IF([test "x$fortify_source" != xno], [
RUBY_TRY_CFLAGS([$optflags -D_FORTIFY_SOURCE=2],
[RUBY_APPEND_OPTION(XCFLAGS, -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2)], [],
[@%:@include <stdio.h>])
])
# -fstack-protector
AS_CASE(["$target_os"],
[emscripten*|wasi*], [
stack_protector=no
])
AS_IF([test -z "${stack_protector+set}"], [
AS_FOR(option, opt, [-fstack-protector-strong -fstack-protector], [
RUBY_TRY_CFLAGS(option, [stack_protector=yes])
AS_IF([test "x$stack_protector" = xyes], [
RUBY_TRY_LDFLAGS(option, [], [stack_protector=])
])
AS_IF([test "x$stack_protector" = xyes], [stack_protector=option; break])
])
])
AC_MSG_CHECKING([for -fstack-protector])
AC_MSG_RESULT(["$stack_protector"])
AS_CASE(["$stack_protector"], [-*], [
RUBY_APPEND_OPTION(XCFLAGS, $stack_protector)
RUBY_APPEND_OPTION(XLDFLAGS, $stack_protector)
RUBY_APPEND_OPTION(LDFLAGS, $stack_protector)
])
# aarch64 branch protection
AS_CASE(["$target_cpu"], [aarch64], [
AS_FOR(option, opt, [-mbranch-protection=pac-ret -msign-return-address=all], [
RUBY_TRY_CFLAGS(option, [branch_protection=yes], [branch_protection=no])
AS_IF([test "x$branch_protection" = xyes], [
# C compiler and assembler must be consistent for -mbranch-protection
# since they both check `__ARM_FEATURE_PAC_DEFAULT` definition.
RUBY_APPEND_OPTION(XCFLAGS, option)
RUBY_APPEND_OPTION(ASFLAGS, option)
break
])
])
])
AS_CASE("${compress_debug_sections:-zlib}",
[none|no], [], [
RUBY_TRY_LDFLAGS(${linker_flag}--compress-debug-sections=${compress_debug_sections:-zlib},
[compress_debug_sections=${compress_debug_sections:-zlib}],
[compress_debug_sections=no])
])
AS_IF([test "x$compress_debug_sections" != xno], [
RUBY_APPEND_OPTION(DLDFLAGS, ${linker_flag}--compress-debug-sections=$compress_debug_sections)
])
AS_CASE(["$target_os"],[mingw*], [
# On Windows platforms, system provided headers are VC++
# optimized. That is, C++ habits are often contaminated into
# various headers. Most frequent situation is the use of //
# comments. We bypass ANSI C mode for them. Otherwise
# extension libs cannot include those headers.
# Since math.h in some mingw64 wrongly declares frexp and modf
# to be pure, the variables pointed by the second arguments are
# considered uninitialized unexpectedly.
AC_CACHE_CHECK([whether frexp and modf are broken],
rb_cv_mingw64_broken_frexp_modf,
[
save_CFLAGS="$CFLAGS"
AS_IF([test "$particular_werror_flags" = "yes"], [
CFLAGS="$CFLAGS -Werror=uninitialized"
], [
CFLAGS="$CFLAGS -Werror -Wuninitialized"
])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[@%:@include <math.h>
int foo(double x)
{
int exp;
frexp(x, &exp);
return exp;
}]], [[if (foo(0.0)) return 1;]])],
[rb_cv_mingw64_broken_frexp_modf=no],
[rb_cv_mingw64_broken_frexp_modf=yes])
CFLAGS="$save_CFLAGS"
])
AS_IF([test "$rb_cv_mingw64_broken_frexp_modf" = yes], [
AC_DEFINE(RUBY_MINGW64_BROKEN_FREXP_MODF)
])
],
[cygwin*|msys*|darwin*|netbsd*], [
# need lgamma_r()
])
# suppress annoying -Wstrict-overflow warnings
RUBY_TRY_CFLAGS(-fno-strict-overflow, [RUBY_APPEND_OPTION(XCFLAGS, -fno-strict-overflow)])
test "${debugflags+set}" || {RUBY_TRY_LDFLAGS(-ggdb3, [debugflags=-ggdb3])}
test "${debugflags+set}" || {RUBY_TRY_LDFLAGS(-ggdb, [debugflags=-ggdb])}
test "${debugflags+set}" || {RUBY_TRY_LDFLAGS(-g3, [debugflags=-g3])}
])
test $ac_cv_prog_cc_g = yes && : ${debugflags=-g}
AS_IF([test "$GCC" = ""], [
AS_CASE(["$target_os"],[aix*],[warnflags="$warnflags -qinfo=por" rb_cv_warnflags="$rb_cv_warnflags -qinfo=por"])
])
AS_IF([test "$GCC" = yes], [
RUBY_TRY_CFLAGS(-fvisibility=hidden, [visibility_option=yes], [visibility_option=no])
AC_SUBST(WERRORFLAG, "-Werror")
AS_IF([test "$visibility_option" = yes], [
RUBY_APPEND_OPTION(XCFLAGS, -fvisibility=hidden)
AC_DEFINE(RUBY_SYMBOL_EXPORT_BEGIN, [_Pragma("GCC visibility push(default)")])
AC_DEFINE(RUBY_SYMBOL_EXPORT_END, [_Pragma("GCC visibility pop")])
], [
RUBY_TRY_LDFLAGS([-Wl,-unexported_symbol,_Init_*], [visibility_option=ld], [visibility_option=no])
])
])
AS_IF([test "$GCC" = yes], [
# optflags
AS_CASE(["$target_os"], [mingw*], [
RUBY_TRY_CFLAGS(-fno-omit-frame-pointer, [optflags="${optflags+$optflags }-fno-omit-frame-pointer"])
RUBY_TRY_CFLAGS(-static-libgcc, [static_libgcc=yes], [static_libgcc=no])
AS_IF([test "$static_libgcc" = yes], [
RUBY_APPEND_OPTION(EXTLDFLAGS, -static-libgcc)
])
])
# disable fast-math
for oflag in -fno-fast-math; do
RUBY_TRY_CFLAGS($oflag, [RUBY_APPEND_OPTION(optflags, $oflag)])
done
for oflag in -fexcess-precision=standard -fp-model\ precise; do
RUBY_TRY_CFLAGS($oflag, [RUBY_APPEND_OPTION(XCFLAGS, $oflag)])
done
])
AS_CASE(["$target_cpu"], [[i[3-6]86*]], [
AC_CACHE_CHECK([for __sync_val_compare_and_swap], [rb_cv_gcc_compiler_cas], [
AC_LINK_IFELSE([AC_LANG_PROGRAM([[unsigned long atomic_var;]],
[[__sync_val_compare_and_swap(&atomic_var, 0, 1);]])],
[rb_cv_gcc_compiler_cas=yes],
[
save_CFLAGS="$CFLAGS" CFLAGS="$CFLAGS -march=i486"
AC_LINK_IFELSE([AC_LANG_PROGRAM([[unsigned long atomic_var;]],
[[__sync_val_compare_and_swap(&atomic_var, 0, 1);]])],
[rb_cv_gcc_compiler_cas=i486],
[rb_cv_gcc_compiler_cas=no])
CFLAGS="$save_CFLAGS"
])
])
AS_IF([test "$rb_cv_gcc_compiler_cas" = i486], [ARCH_FLAG="-march=i486"])
])
OPT_DIR=
AC_ARG_WITH([gmp-dir],
AS_HELP_STRING([--with-gmp-dir=DIR],
[specify the prefix directory where gmp is installed]),
[OPT_DIR="${OPT_DIR:+$OPT_DIR$PATH_SEPARATOR}$withval"], [])
AC_ARG_WITH([gmp],
[AS_HELP_STRING([--without-gmp],
[disable GNU GMP to accelerate Bignum operations])],
[], [with_gmp=yes])
AC_ARG_WITH(opt-dir,
AS_HELP_STRING([--with-opt-dir=DIR-LIST],
[add optional headers and libraries directories separated by $PATH_SEPARATOR]),
[OPT_DIR="${OPT_DIR:+$OPT_DIR$PATH_SEPARATOR}$withval"], [])
AS_IF([test "x$OPT_DIR" != x], [
val=`IFS="$PATH_SEPARATOR"
for dir in $OPT_DIR; do
test -z "$dir" && continue
echo x ${LIBPATHFLAG} ${RPATHFLAG} |
sed "s/^x *//;s${IFS}"'%1\\$-s'"${IFS}${dir}/lib${IFS}g;s${IFS}%s${IFS}${dir}/lib${IFS}g"
done | tr '\012' ' ' | sed 's/ *$//'`
LDFLAGS="${LDFLAGS:+$LDFLAGS }$val"
DLDFLAGS="${DLDFLAGS:+$DLDFLAGS }$val"
LDFLAGS_OPTDIR="$val"
INCFLAGS="${INCFLAGS:+$INCFLAGS }"`echo "$OPT_DIR" | tr "${PATH_SEPARATOR}" '\012' |
sed '/^$/d;s|^|-I|;s|$|/include|' | tr '\012' ' ' | sed 's/ *$//'`
])
AC_SUBST(incflags, "$INCFLAGS")
test -z "${ac_env_CFLAGS_set}" -a -n "${cflags+set}" && eval CFLAGS="\"$cflags $ARCH_FLAG\""
test -z "${ac_env_CXXFLAGS_set}" -a -n "${cxxflags+set}" && eval CXXFLAGS="\"$cxxflags $ARCH_FLAG\""
AC_CACHE_CHECK([whether compiler has statement and declarations in expressions],
rb_cv_have_stmt_and_decl_in_expr,
[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]],[[ __extension__ ({ int a = 0; a; }); ]])],