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configure.ac
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dnl Process this file with autoconf to produce a configure script.
dnl Note we do not use AC_PREREQ here! See aclocal.m4 for what we use instead.
AC_INIT([GNU C Library], [(see version.h)], [https://sourceware.org/bugzilla/],
[glibc], [https://www.gnu.org/software/glibc/])
AC_CONFIG_SRCDIR([include/features.h])
AC_CONFIG_HEADERS([config.h])
AC_CONFIG_AUX_DIR([scripts])
ACX_PKGVERSION([GNU libc])
ACX_BUGURL([https://www.gnu.org/software/libc/bugs.html])
AC_DEFINE_UNQUOTED([PKGVERSION], ["$PKGVERSION"],
[Package description])
AC_DEFINE_UNQUOTED([REPORT_BUGS_TO], ["$REPORT_BUGS_TO"],
[Bug reporting address])
# Glibc should not depend on any header files
AC_DEFUN([_AC_INCLUDES_DEFAULT_REQUIREMENTS],
[m4_divert_text([DEFAULTS],
[ac_includes_default='/* none */'])])
# We require GCC, and by default use its preprocessor. Override AC_PROG_CPP
# here to work around the Autoconf issue discussed in
# <https://sourceware.org/ml/libc-alpha/2013-01/msg00721.html>.
AC_DEFUN([AC_PROG_CPP],
[AC_REQUIRE([AC_PROG_CC])dnl
AC_ARG_VAR([CPP], [C preprocessor])dnl
_AC_ARG_VAR_CPPFLAGS()dnl
# On Suns, sometimes $CPP names a directory.
if test -n "$CPP" && test -d "$CPP"; then
CPP=
fi
if test -z "$CPP"; then
CPP="$CC -E"
fi
AC_SUBST(CPP)dnl
])# AC_PROG_CPP
# We require GCC. Override _AC_PROG_CC_C89 here to work around the Autoconf
# issue discussed in
# <https://sourceware.org/ml/libc-alpha/2013-01/msg00757.html>.
AC_DEFUN([_AC_PROG_CC_C89], [[$1]])
dnl This is here so we can set $subdirs directly based on configure fragments.
AC_CONFIG_SUBDIRS()
AC_CANONICAL_HOST
AC_PROG_CC
if test $host != $build; then
AC_CHECK_PROGS(BUILD_CC, gcc cc)
fi
AC_SUBST(cross_compiling)
AC_PROG_CPP
# We need the C++ compiler only for testing.
AC_PROG_CXX
# It's useless to us if it can't link programs (e.g. missing -lstdc++).
AC_CACHE_CHECK([whether $CXX can link programs], libc_cv_cxx_link_ok, [dnl
AC_LANG_PUSH([C++])
# Default, dynamic case.
AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])],
[libc_cv_cxx_link_ok=yes],
[libc_cv_cxx_link_ok=no])
# Static case.
old_LDFLAGS="$LDFLAGS"
LDFLAGS="$LDFLAGS -static"
AC_LINK_IFELSE([AC_LANG_SOURCE([
#include <iostream>
int
main()
{
std::cout << "Hello, world!";
return 0;
}
])],
[],
[libc_cv_cxx_link_ok=no])
LDFLAGS="$old_LDFLAGS"
AC_LANG_POP([C++])])
AS_IF([test $libc_cv_cxx_link_ok != yes], [CXX=])
if test "`cd $srcdir; pwd -P`" = "`pwd -P`"; then
AC_MSG_ERROR([you must configure in a separate build directory])
fi
# This will get text that should go into config.make.
config_vars=
# Check for a --with-gd argument and set libgd-LDFLAGS in config.make.
AC_ARG_WITH([gd],
AS_HELP_STRING([--with-gd=DIR],
[find libgd include dir and library with prefix DIR]),
[dnl
case "$with_gd" in
yes|''|no) ;;
*) libgd_include="-I$withval/include"
libgd_ldflags="-L$withval/lib" ;;
esac
])
AC_ARG_WITH([gd-include],
AS_HELP_STRING([--with-gd-include=DIR],
[find libgd include files in DIR]),
[dnl
case "$with_gd_include" in
''|no) ;;
*) libgd_include="-I$withval" ;;
esac
])
AC_ARG_WITH([gd-lib],
AS_HELP_STRING([--with-gd-lib=DIR],
[find libgd library files in DIR]),
[dnl
case "$with_gd_lib" in
''|no) ;;
*) libgd_ldflags="-L$withval" ;;
esac
])
if test -n "$libgd_include"; then
config_vars="$config_vars
CFLAGS-memusagestat.c = $libgd_include"
fi
if test -n "$libgd_ldflags"; then
config_vars="$config_vars
libgd-LDFLAGS = $libgd_ldflags"
fi
dnl Arguments to specify presence of other packages/features.
AC_ARG_WITH([binutils],
AS_HELP_STRING([--with-binutils=PATH],
[specify location of binutils (as and ld)]),
[path_binutils=$withval],
[path_binutils=''])
AC_ARG_WITH([selinux],
AS_HELP_STRING([--with-selinux],
[if building with SELinux support]),
[with_selinux=$withval],
[with_selinux=auto])
AC_ARG_WITH([headers],
AS_HELP_STRING([--with-headers=PATH],
[location of system headers to use
(for example /usr/src/linux/include)
@<:@default=compiler default@:>@]),
[sysheaders=$withval],
[sysheaders=''])
AC_SUBST(sysheaders)
dnl Additional build flags injection.
AC_ARG_WITH([nonshared-cflags],
AS_HELP_STRING([--with-nonshared-cflags=CFLAGS],
[build nonshared libraries with additional CFLAGS]),
[extra_nonshared_cflags=$withval],
[extra_nonshared_cflags=])
AC_SUBST(extra_nonshared_cflags)
AC_ARG_WITH([rtld-early-cflags],
AS_HELP_STRING([--with-rtld-early-cflags=CFLAGS],
[build early initialization with additional CFLAGS]),
[rtld_early_cflags=$withval],
[rtld_early_cflags=])
AC_SUBST(rtld_early_cflags)
AC_ARG_WITH([timeoutfactor],
AS_HELP_STRING([--with-timeoutfactor=NUM],
[specify an integer to scale the timeout]),
[timeoutfactor=$withval],
[timeoutfactor=1])
AC_DEFINE_UNQUOTED(TIMEOUTFACTOR, $timeoutfactor)
AC_ARG_ENABLE([sanity-checks],
AS_HELP_STRING([--disable-sanity-checks],
[really do not use threads (should not be used except in special situations) @<:@default=yes@:>@]),
[enable_sanity=$enableval],
[enable_sanity=yes])
AC_ARG_ENABLE([shared],
AS_HELP_STRING([--enable-shared],
[build shared library @<:@default=yes if GNU ld@:>@]),
[shared=$enableval],
[shared=yes])
AC_ARG_ENABLE([profile],
AS_HELP_STRING([--enable-profile],
[build profiled library @<:@default=no@:>@]),
[profile=$enableval],
[profile=no])
AC_ARG_ENABLE([default-pie],
AS_HELP_STRING([--disable-default-pie],
[Do not build glibc programs and the testsuite as PIE @<:@default=no@:>@]),
[default_pie=$enableval],
[default_pie=yes])
AC_ARG_ENABLE([timezone-tools],
AS_HELP_STRING([--disable-timezone-tools],
[do not install timezone tools @<:@default=install@:>@]),
[enable_timezone_tools=$enableval],
[enable_timezone_tools=yes])
AC_SUBST(enable_timezone_tools)
AC_ARG_ENABLE([hardcoded-path-in-tests],
AS_HELP_STRING([--enable-hardcoded-path-in-tests],
[hardcode newly built glibc path in tests @<:@default=no@:>@]),
[hardcoded_path_in_tests=$enableval],
[hardcoded_path_in_tests=no])
AC_SUBST(hardcoded_path_in_tests)
AC_ARG_ENABLE([hidden-plt],
AS_HELP_STRING([--disable-hidden-plt],
[do not hide internal function calls to avoid PLT]),
[hidden=$enableval],
[hidden=yes])
if test "x$hidden" = xno; then
AC_DEFINE(NO_HIDDEN)
fi
AC_ARG_ENABLE([bind-now],
AS_HELP_STRING([--enable-bind-now],
[disable lazy relocations in DSOs]),
[bindnow=$enableval],
[bindnow=no])
AC_SUBST(bindnow)
if test "x$bindnow" = xyes; then
AC_DEFINE(BIND_NOW)
fi
dnl Build glibc with -fstack-protector, -fstack-protector-all, or
dnl -fstack-protector-strong.
AC_ARG_ENABLE([stack-protector],
AS_HELP_STRING([--enable-stack-protector=@<:@yes|no|all|strong@:>@],
[Use -fstack-protector[-all|-strong] to detect glibc buffer overflows]),
[enable_stack_protector=$enableval],
[enable_stack_protector=no])
case "$enable_stack_protector" in
all|yes|no|strong) ;;
*) AC_MSG_ERROR([Not a valid argument for --enable-stack-protector: "$enable_stack_protector"]);;
esac
dnl On some platforms we cannot use dynamic loading. We must provide
dnl static NSS modules.
AC_ARG_ENABLE([static-nss],
AS_HELP_STRING([--enable-static-nss],
[build static NSS modules @<:@default=no@:>@]),
[static_nss=$enableval],
[static_nss=no])
dnl Enable static NSS also if we build no shared objects.
if test x"$static_nss" = xyes || test x"$shared" = xno; then
static_nss=yes
AC_DEFINE(DO_STATIC_NSS)
fi
AC_ARG_ENABLE([force-install],
AS_HELP_STRING([--disable-force-install],
[don't force installation of files from this package, even if they are older than the installed files]),
[force_install=$enableval],
[force_install=yes])
AC_SUBST(force_install)
AC_ARG_ENABLE([maintainer-mode],
AS_HELP_STRING([--enable-maintainer-mode],
[enable make rules and dependencies not useful (and sometimes confusing) to the casual installer]),
[maintainer=$enableval],
[maintainer=no])
dnl On some platforms we allow dropping compatibility with all kernel
dnl versions.
AC_ARG_ENABLE([kernel],
AS_HELP_STRING([--enable-kernel=VERSION],
[compile for compatibility with kernel not older than VERSION]),
[minimum_kernel=$enableval],
[])
dnl Prevent unreasonable values.
if test "$minimum_kernel" = yes || test "$minimum_kernel" = no; then
# Better nothing than this.
minimum_kernel=""
else
if test "$minimum_kernel" = current; then
minimum_kernel=`uname -r 2>/dev/null` || minimum_kernel=
fi
fi
AC_ARG_ENABLE([werror],
AS_HELP_STRING([--disable-werror],
[do not build with -Werror]),
[enable_werror=$enableval],
[enable_werror=yes])
AC_SUBST(enable_werror)
AC_ARG_ENABLE([multi-arch],
AS_HELP_STRING([--enable-multi-arch],
[enable single DSO with optimizations for multiple architectures]),
[multi_arch=$enableval],
[multi_arch=default])
AC_ARG_ENABLE([memory-tagging],
AS_HELP_STRING([--enable-memory-tagging],
[enable memory tagging if supported by the architecture @<:@default=no@:>@]),
[memory_tagging=$enableval],
[memory_tagging=no])
if test "$memory_tagging" = yes; then
# Only enable this on architectures that support it.
case $host_cpu in
aarch64)
AC_DEFINE(USE_MTAG)
;;
esac
fi
AC_SUBST(memory_tagging)
AC_ARG_ENABLE([systemtap],
[AS_HELP_STRING([--enable-systemtap],
[enable systemtap static probe points @<:@default=no@:>@])],
[systemtap=$enableval],
[systemtap=no])
if test "x$systemtap" != xno; then
AC_CACHE_CHECK([for systemtap static probe support], libc_cv_sdt, [dnl
old_CFLAGS="$CFLAGS"
CFLAGS="-std=gnu11 $CFLAGS"
AC_COMPILE_IFELSE([AC_LANG_SOURCE([[#include <sys/sdt.h>
void foo (int i, void *p)
{
asm ("" STAP_PROBE_ASM (foo, bar, STAP_PROBE_ASM_TEMPLATE (2)) ""
:: STAP_PROBE_ASM_OPERANDS (2, i, p));
}]])], [libc_cv_sdt=yes], [libc_cv_sdt=no])
CFLAGS="$old_CFLAGS"])
if test $libc_cv_sdt = yes; then
AC_DEFINE([USE_STAP_PROBE])
elif test "x$systemtap" != xauto; then
AC_MSG_FAILURE([systemtap support needs sys/sdt.h with asm support])
fi
fi
AC_ARG_ENABLE([build-nscd],
[AS_HELP_STRING([--disable-build-nscd],
[disable building and installing the nscd daemon])],
[build_nscd=$enableval],
[build_nscd=default])
AC_SUBST(build_nscd)
# Note the use of $use_nscd is near the bottom of the file.
AC_ARG_ENABLE([nscd],
[AS_HELP_STRING([--disable-nscd],
[library functions will not contact the nscd daemon])],
[use_nscd=$enableval],
[use_nscd=yes])
AC_ARG_ENABLE([pt_chown],
[AS_HELP_STRING([--enable-pt_chown],
[Enable building and installing pt_chown])],
[build_pt_chown=$enableval],
[build_pt_chown=no])
AC_SUBST(build_pt_chown)
if test "$build_pt_chown" = yes; then
AC_DEFINE(HAVE_PT_CHOWN)
fi
# The abi-tags file uses a fairly simplistic model for name recognition that
# can't distinguish i486-pc-linux-gnu fully from i486-pc-gnu. So we mutate a
# $host_os of `gnu*' here to be `gnu-gnu*' just so that it can tell.
# This doesn't get used much beyond that, so it's fairly safe.
case "$host_os" in
linux*)
;;
gnu*)
host_os=`echo $host_os | sed -e 's/gnu/gnu-gnu/'`
;;
esac
AC_ARG_ENABLE([mathvec],
[AS_HELP_STRING([--enable-mathvec],
[Enable building and installing mathvec @<:@default depends on architecture@:>@])],
[build_mathvec=$enableval],
[build_mathvec=notset])
AC_PREPROC_IFELSE([AC_LANG_PROGRAM([[]], [[
#ifndef __CET__
# error no CET compiler support
#endif]])],
[libc_cv_compiler_default_cet=yes],
[libc_cv_compiler_default_cet=no])
AC_ARG_ENABLE([cet],
AS_HELP_STRING([--enable-cet],
[enable Intel Control-flow Enforcement Technology (CET), x86 only]),
[enable_cet=$enableval],
[enable_cet=$libc_cv_compiler_default_cet])
AC_ARG_ENABLE([scv],
AS_HELP_STRING([--disable-scv],
[syscalls will not use scv instruction, even if the kernel supports it, powerpc only]),
[use_scv=$enableval],
[use_scv=yes])
AS_IF([[test "$use_scv" != "no"]],[AC_DEFINE(USE_PPC_SCV)])
dnl Build glibc with _FORTIFY_SOURCE
AC_ARG_ENABLE(fortify-source,
AS_HELP_STRING([--enable-fortify-source@<:@=1|2|3@:>@],
[Use -D_FORTIFY_SOURCE=[1|2|3] to control code hardening, defaults to highest possible value supported by the build compiler.]),
[enable_fortify_source=$enableval],
[enable_fortify_source=no])
case "$enable_fortify_source" in
1|2|3|no|yes) ;;
*) AC_MSG_ERROR([Not a valid argument for --enable-fortify-source: "$enable_fortify_source"]);;
esac
# We keep the original values in `$config_*' and never modify them, so we
# can write them unchanged into config.make. Everything else uses
# $machine, $vendor, and $os, and changes them whenever convenient.
config_machine=$host_cpu config_vendor=$host_vendor config_os=$host_os
# Don't allow vendor == "unknown"
test "$config_vendor" = unknown && config_vendor=
config_os="`echo $config_os | sed 's/^unknown-//'`"
# Some configurations imply other options.
elf=yes
# The configure fragment of a port can modify these to supplement
# or override the table in the case statement below. No fragment should
# ever change the config_* variables, however.
machine=$config_machine
vendor=$config_vendor
os=$config_os
base_os=''
submachine=
AC_ARG_WITH([cpu],
AS_HELP_STRING([--with-cpu=CPU], [select code for CPU variant]),
[dnl
case "$withval" in
yes|'') AC_MSG_ERROR([--with-cpu requires an argument]) ;;
no) ;;
*) submachine="$withval" ;;
esac
])
# An preconfigure script can set this when it wants to disable the sanity
# check below.
libc_config_ok=no
# A preconfigure script for a system that may or may not use fpu
# sysdeps directories sets this to a preprocessor conditional for
# whether to use such directories.
with_fp_cond=1
# A preconfigure script may define another name to TLS descriptor variant
mtls_descriptor=gnu2
dnl Let sysdeps/*/preconfigure act here.
LIBC_PRECONFIGURE([$srcdir], [for sysdeps])
###
### By using the undocumented --enable-hacker-mode option for configure
### one can skip this test to make the configuration not fail for unsupported
### platforms.
###
if test -z "$enable_hacker_mode" && test x"$libc_config_ok" != xyes; then
case "$machine-$host_os" in
*-linux* | *-gnu*)
;;
*)
AC_MSG_ERROR([
*** The GNU C library is currently unavailable for this platform.
*** If you are interested in seeing glibc on this platform visit
*** the "How to submit a new port" in the wiki:
*** https://sourceware.org/glibc/wiki/#Development
*** and join the community!])
;;
esac
fi
# Set base_machine if not set by a preconfigure fragment.
test -n "$base_machine" || base_machine=$machine
AC_SUBST(base_machine)
### Locate tools.
AC_PROG_INSTALL
if test "$INSTALL" = "${srcdir}/scripts/install-sh -c"; then
# The makefiles need to use a different form to find it in $srcdir.
INSTALL='\$(..)./scripts/install-sh -c'
fi
AC_PROG_LN_S
LIBC_PROG_BINUTILS
# Accept binutils 2.25 or newer.
libc_cv_with_lld=no
case $($LD --version) in
"GNU gold"*)
# Accept gold 1.14 or higher
AC_CHECK_PROG_VER(LD, $LD, --version,
[GNU gold.* \([0-9][0-9]*\.[0-9.]*\)],
[1.1[4-9]*|1.[2-9][0-9]*|1.1[0-9][0-9]*|[2-9].*|[1-9][0-9]*],
LD=: critic_missing="$critic_missing GNU gold")
;;
"LLD"*)
# Accept LLD 13.0.0 or higher
AC_CHECK_PROG_VER(LD, $LD, --version,
[LLD.* \([0-9][0-9]*\.[0-9.]*\)],
[1[3-9].*|[2-9][0-9].*],
LD=: critic_missing="$critic_missing LLD")
libc_cv_with_lld=yes
;;
*)
AC_CHECK_PROG_VER(LD, $LD, --version,
[GNU ld.* \([0-9][0-9]*\.[0-9.]*\)],
[2.1[0-9][0-9]*|2.2[5-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*],
LD=: critic_missing="$critic_missing GNU ld")
;;
esac
LIBC_CONFIG_VAR([with-lld], [$libc_cv_with_lld])
# These programs are version sensitive.
AC_CHECK_PROG_VER(MAKE, gnumake gmake make, --version,
[GNU Make[^0-9]*\([0-9][0-9.]*\)],
[[4-9].* | [1-9][0-9]*], critic_missing="$critic_missing make")
AC_CHECK_PROG_VER(MSGFMT, gnumsgfmt gmsgfmt msgfmt, --version,
[GNU gettext.* \([0-9]*\.[0-9.]*\)],
[0.10.3[6-9]* | 0.10.[4-9][0-9]* | 0.1[1-9]* | 0.[2-9][0-9]* | [1-9].*],
MSGFMT=: aux_missing="$aux_missing msgfmt")
AC_CHECK_PROG_VER(MAKEINFO, makeinfo, --version,
[GNU texinfo.* \([0-9][0-9.]*\)],
[4.[7-9]*|4.[1-9][0-9]*|[5-9].*],
MAKEINFO=: aux_missing="$aux_missing makeinfo")
AC_CHECK_PROG_VER(SED, sed, --version,
[GNU sed[^0-9]* \([0-9]*\.[0-9.]*\)],
[3.0[2-9]*|3.[1-9]*|[4-9]*],
SED=: aux_missing="$aux_missing sed")
AC_CHECK_PROG_VER(AWK, gawk, --version,
[GNU Awk[^0-9]*\([0-9][0-9.]*\)],
[3.1.[2-9]*|3.[2-9]*|[4-9]*], critic_missing="$critic_missing gawk")
AC_CHECK_PROG_VER(BISON, bison, --version,
[bison (GNU Bison) \([0-9]*\.[0-9.]*\)],
[2.7*|[3-9].*|[1-9][0-9]*], critic_missing="$critic_missing bison")
AC_CACHE_CHECK([if $CC is sufficient to build libc], libc_cv_compiler_ok, [
AC_PREPROC_IFELSE([AC_LANG_PROGRAM([[]], [[
#if !defined __GNUC__ || __GNUC__ < 6 || (__GNUC__ == 6 && __GNUC_MINOR__ < 2)
#error insufficient compiler
#endif]])],
[libc_cv_compiler_ok=yes],
[libc_cv_compiler_ok=no])])
AS_IF([test $libc_cv_compiler_ok != yes],
[critic_missing="$critic_missing compiler"])
if test "x$maintainer" = "xyes"; then
AC_CHECK_PROGS(AUTOCONF, autoconf, no)
case "x$AUTOCONF" in
xno|x|x:) AUTOCONF=no ;;
*)
AC_CACHE_CHECK(dnl
whether $AUTOCONF${ACFLAGS:+ }$ACFLAGS works, libc_cv_autoconf_works, [dnl
if (cd $srcdir; $AUTOCONF $ACFLAGS configure.ac > /dev/null 2>&1); then
libc_cv_autoconf_works=yes
else
libc_cv_autoconf_works=no
fi])
test $libc_cv_autoconf_works = yes || AUTOCONF=no
;;
esac
if test "x$AUTOCONF" = xno; then
aux_missing="$aux_missing autoconf"
fi
else
AUTOCONF=no
fi
# Check for python3 if available, or else python.
AC_CHECK_PROG_VER(PYTHON_PROG, python3 python, --version,
[Python \([0-9][0-9.]*\)],
[3.[4-9]*|3.[1-9][0-9]*|[4-9].*|[1-9][0-9]*],
critic_missing="$critic_missing python")
PYTHON="$PYTHON_PROG -B"
AC_SUBST(PYTHON)
test -n "$critic_missing" && AC_MSG_ERROR([
*** These critical programs are missing or too old:$critic_missing
*** Check the INSTALL file for required versions.])
test -n "$aux_missing" && AC_MSG_WARN([
*** These auxiliary programs are missing or incompatible versions:$aux_missing
*** some features or tests will be disabled.
*** Check the INSTALL file for required versions.])
# Determine whether to use fpu or nofpu sysdeps directories.
AC_CACHE_CHECK([for use of fpu sysdeps directories],
libc_cv_with_fp, [dnl
cat > conftest.c <<EOF
#if $with_fp_cond
int dummy;
#else
# error "no hardware floating point"
#endif
EOF
libc_cv_with_fp=no
if ${CC-cc} $CFLAGS $CPPFLAGS -S conftest.c -o conftest.s \
1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD ; then
libc_cv_with_fp=yes
fi
rm -f conftest*])
AC_SUBST(libc_cv_with_fp)
AC_CACHE_CHECK(for -fstack-protector, libc_cv_ssp, [dnl
LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector],
[libc_cv_ssp=yes],
[libc_cv_ssp=no])
])
AC_CACHE_CHECK(for -fstack-protector-strong, libc_cv_ssp_strong, [dnl
LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector-strong],
[libc_cv_ssp_strong=yes],
[libc_cv_ssp_strong=no])
])
AC_CACHE_CHECK(for -fstack-protector-all, libc_cv_ssp_all, [dnl
LIBC_TRY_CC_OPTION([$CFLAGS $CPPFLAGS -Werror -fstack-protector-all],
[libc_cv_ssp_all=yes],
[libc_cv_ssp_all=no])
])
stack_protector=
no_stack_protector=
if test "$libc_cv_ssp" = yes; then
no_stack_protector="-fno-stack-protector -DSTACK_PROTECTOR_LEVEL=0"
AC_DEFINE(HAVE_CC_NO_STACK_PROTECTOR)
fi
if test "$enable_stack_protector" = yes && test "$libc_cv_ssp" = yes; then
stack_protector="-fstack-protector"
AC_DEFINE(STACK_PROTECTOR_LEVEL, 1)
elif test "$enable_stack_protector" = all && test "$libc_cv_ssp_all" = yes; then
stack_protector="-fstack-protector-all"
AC_DEFINE(STACK_PROTECTOR_LEVEL, 2)
elif test "$enable_stack_protector" = strong && test "$libc_cv_ssp_strong" = yes; then
stack_protector="-fstack-protector-strong"
AC_DEFINE(STACK_PROTECTOR_LEVEL, 3)
else
stack_protector="-fno-stack-protector"
AC_DEFINE(STACK_PROTECTOR_LEVEL, 0)
fi
AC_SUBST(libc_cv_ssp)
AC_SUBST(stack_protector)
AC_SUBST(no_stack_protector)
if test -n "$stack_protector"; then
dnl Don't run configure tests with stack-protection on, to avoid problems with
dnl bootstrapping.
no_ssp=-fno-stack-protector
else
no_ssp=
if test "$enable_stack_protector" != no; then
AC_MSG_ERROR([--enable-stack-protector=$enable_stack_protector specified, but specified level of stack protection is not supported by the compiler.])
fi
fi
# For the multi-arch option we need support in the assembler & linker.
AC_CACHE_CHECK([for assembler and linker STT_GNU_IFUNC support],
libc_cv_ld_gnu_indirect_function, [dnl
cat > conftest.S <<EOF
.type foo,%gnu_indirect_function
foo:
.globl _start
_start:
.globl __start
__start:
.data
#ifdef _LP64
.quad foo
#else
.long foo
#endif
EOF
libc_cv_ld_gnu_indirect_function=no
if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
-nostartfiles -nostdlib $no_ssp \
-o conftest conftest.S 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
# Do a link to see if the backend supports IFUNC relocs.
$READELF -r conftest 1>&AS_MESSAGE_LOG_FD
LC_ALL=C $READELF -Wr conftest | grep -q 'IRELATIVE\|R_SPARC_JMP_IREL' && {
libc_cv_ld_gnu_indirect_function=yes
}
fi
rm -f conftest*])
# Check if gcc supports attribute ifunc as it is used in libc_ifunc macro.
AC_CACHE_CHECK([for gcc attribute ifunc support],
libc_cv_gcc_indirect_function, [dnl
cat > conftest.c <<EOF
extern int func (int);
int used_func (int a)
{
return a;
}
static void *resolver ()
{
return &used_func;
}
extern __typeof (func) func __attribute__ ((ifunc ("resolver")));
EOF
libc_cv_gcc_indirect_function=no
if ${CC-cc} -c conftest.c -o conftest.o 1>&AS_MESSAGE_LOG_FD \
2>&AS_MESSAGE_LOG_FD ; then
if $READELF -s conftest.o | grep IFUNC >/dev/null 2>&AS_MESSAGE_LOG_FD; then
libc_cv_gcc_indirect_function=yes
fi
fi
rm -f conftest*])
# Check if linker supports textrel relocation with ifunc (used on elf/tests).
# Note that it relies on libc_cv_ld_gnu_indirect_function test above.
AC_CACHE_CHECK([whether the linker supports textrels along with ifunc],
libc_cv_textrel_ifunc, [dnl
cat > conftest.S <<EOF
.type foo,%gnu_indirect_function
foo:
.globl _start
_start:
.globl __start
__start:
.data
#ifdef _LP64
.quad foo
#else
.long foo
#endif
.text
.globl address
address:
#ifdef _LP64
.quad address
#else
.long address
#endif
EOF
libc_cv_textrel_ifunc=no
if test $libc_cv_ld_gnu_indirect_function = yes; then
if AC_TRY_COMMAND(${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -nostartfiles -nostdlib $no_ssp -pie -o conftest conftest.S); then
libc_cv_textrel_ifunc=yes
fi
fi
rm -f conftest*])
AC_SUBST(libc_cv_textrel_ifunc)
# Check if CC supports attribute retain as it is used in attribute_used_retain macro.
AC_CACHE_CHECK([for GNU attribute retain support],
libc_cv_gnu_retain, [dnl
cat > conftest.c <<EOF
static int var __attribute__ ((used, retain, section ("__libc_atexit")));
EOF
libc_cv_gnu_retain=no
if ${CC-cc} -Werror -c conftest.c -o /dev/null 1>&AS_MESSAGE_LOG_FD \
2>&AS_MESSAGE_LOG_FD ; then
libc_cv_gnu_retain=yes
fi
rm -f conftest*])
if test $libc_cv_gnu_retain = yes; then
AC_DEFINE(HAVE_GNU_RETAIN)
fi
LIBC_CONFIG_VAR([have-gnu-retain], [$libc_cv_gnu_retain])
# Check if gcc warns about alias for function with incompatible types.
AC_CACHE_CHECK([if compiler warns about alias for function with incompatible types],
libc_cv_gcc_incompatible_alias, [dnl
cat > conftest.c <<EOF
int __redirect_foo (const void *s, int c);
__typeof (__redirect_foo) *foo_impl (void) __asm__ ("foo");
__typeof (__redirect_foo) *foo_impl (void)
{
return 0;
}
extern __typeof (__redirect_foo) foo_alias __attribute__ ((alias ("foo")));
EOF
libc_cv_gcc_incompatible_alias=yes
if ${CC-cc} -Werror -c conftest.c -o conftest.o 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD ; then
libc_cv_gcc_incompatible_alias=no
fi
rm -f conftest*])
if test x"$libc_cv_ld_gnu_indirect_function" != xyes; then
if test x"$multi_arch" = xyes; then
AC_MSG_ERROR([--enable-multi-arch support requires assembler and linker support])
else
multi_arch=no
fi
fi
if test x"$libc_cv_gcc_indirect_function" != xyes; then
# GCC 8+ emits a warning for alias with incompatible types and it might
# fail to build ifunc resolvers aliases to either weak or internal
# symbols. Disables multiarch build in this case.
if test x"$libc_cv_gcc_incompatible_alias" = xyes; then
AC_MSG_WARN([gcc emits a warning for alias between functions of incompatible types])
if test x"$multi_arch" = xyes; then
AC_MSG_ERROR([--enable-multi-arch support requires a gcc with gnu-indirect-function support])
fi
AC_MSG_WARN([Multi-arch is disabled.])
multi_arch=no
elif test x"$multi_arch" = xyes; then
AC_MSG_WARN([--enable-multi-arch support recommends a gcc with gnu-indirect-function support.
Please use a gcc which supports it by default or configure gcc with --enable-gnu-indirect-function])
fi
fi
multi_arch_d=
if test x"$multi_arch" != xno; then
multi_arch_d=/multiarch
fi
# Compute the list of sysdep directories for this configuration.
# This can take a while to compute.
sysdep_dir=$srcdir/sysdeps
AC_MSG_CHECKING(sysdep dirs)
dnl We need to use [ and ] for other purposes for a while now.
changequote(,)dnl
# Make sco3.2v4 become sco3.2.4 and sunos4.1.1_U1 become sunos4.1.1.U1.
os="`echo $os | sed 's/\([0-9A-Z]\)[v_]\([0-9A-Z]\)/\1.\2/g'`"
test "x$base_os" != x || case "$os" in
gnu*)
base_os=mach/hurd ;;
linux*)
base_os=unix/sysv ;;
esac
# For sunos4.1.1, try sunos4.1.1, then sunos4.1, then sunos4, then sunos.
tail=$os
ostry=$os
while o=`echo $tail | sed 's/\.[^.]*$//'`; test $o != $tail; do
ostry="$ostry /$o"
tail=$o
done
o=`echo $tail | sed 's/[0-9]*$//'`
if test $o != $tail; then
ostry="$ostry /$o"
fi
# For linux-gnu, try linux-gnu, then linux.
o=`echo $tail | sed 's/-.*$//'`
if test $o != $tail; then
ostry="$ostry /$o"
fi
# For unix/sysv/sysv4, try unix/sysv/sysv4, then unix/sysv, then unix.
base=
tail=$base_os
while b=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$b"; do
set $b
base="$base /$1"
tail="$2"
done
# For sparc/sparc32, try sparc/sparc32 and then sparc.
mach=
tail=$machine${submachine:+/$submachine}
while m=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$m"; do
set $m
# Prepend the machine's FPU directory unless the architecture specific
# preconfigure disables it.
if test "$libc_cv_with_fp" = yes; then
maybe_fpu=/fpu
else
maybe_fpu=/nofpu
fi
# For each machine term, try it with and then without /multiarch.
for try_fpu in $maybe_fpu ''; do
for try_multi in $multi_arch_d ''; do
mach="$mach /$1$try_fpu$try_multi"
done
done
tail="$2"
done
dnl We are done with glob and regexp uses of [ and ]; return to autoconf.
changequote([,])dnl
# Find what sysdep directories exist.
sysnames=
for b in $base ''; do
for m0 in $mach ''; do
for v in /$vendor ''; do
test "$v" = / && continue
for o in /$ostry ''; do
test "$o" = / && continue
for m in $mach ''; do
try_suffix="$m0$b$v$o$m"
if test -n "$try_suffix"; then
try_srcdir="${srcdir}/"
try="sysdeps$try_suffix"
test -n "$enable_debug_configure" &&
echo "$0 [DEBUG]: try $try" >&2
if test -d "$try_srcdir$try"; then
sysnames="$sysnames $try"
{ test -n "$o" || test -n "$b"; } && os_used=t
{ test -n "$m" || test -n "$m0"; } && machine_used=t
case x${m0:-$m} in
x*/$submachine) submachine_used=t ;;
esac
fi
fi
done
done
done
done
done
# If the assembler supports gnu_indirect_function symbol type and the
# architecture supports multi-arch, we enable multi-arch by default.
case $sysnames in
*"$multi_arch_d"*)
;;
*)
test x"$multi_arch" = xdefault && multi_arch=no
;;
esac
if test x"$multi_arch" != xno; then
AC_DEFINE(USE_MULTIARCH)
fi
AC_SUBST(multi_arch)
if test -z "$os_used" && test "$os" != none; then
AC_MSG_ERROR(Operating system $os is not supported.)
fi
if test -z "$machine_used" && test "$machine" != none; then
AC_MSG_ERROR(The $machine is not supported.)
fi
if test -z "$submachine_used" && test -n "$submachine"; then
AC_MSG_ERROR(The $submachine subspecies of $host_cpu is not supported.)
fi
AC_SUBST(submachine)
# We have now validated the configuration.
# Expand the list of system names into a full list of directories
# from each element's parent name and Implies file (if present).
set $sysnames
names=
while test $# -gt 0; do
name=$1
shift
case " $names " in *" $name "*)
# Already in the list.
continue
esac
# Report each name as we discover it, so there is no long pause in output.
echo $ECHO_N "$name $ECHO_C" >&AS_MESSAGE_FD
name_base=`echo $name | sed -e 's@\(.*sysdeps\)/.*@\1@'`
case $name in
/*) xsrcdir= ;;
*) xsrcdir=$srcdir/ ;;
esac
test -n "$enable_debug_configure" &&
echo "[DEBUG]: name/Implies $xsrcdir$name/Implies" >&2
for implies_file in Implies Implies-before Implies-after; do
implies_type=`echo $implies_file | sed s/-/_/`
eval ${implies_type}=
if test -f $xsrcdir$name/$implies_file; then
# Collect more names from the `Implies' file (removing comments).
implied_candidate="`sed 's/#.*$//' < $xsrcdir$name/$implies_file`"
for x in $implied_candidate; do
found=no
if test -d $xsrcdir$name_base/$x; then
eval "${implies_type}=\"\$${implies_type} \$name_base/\$x\""
found=yes
fi
try="sysdeps/$x"
try_srcdir=$srcdir/
test -n "$enable_debug_configure" &&
echo "[DEBUG]: $name $implies_file $x try() {$try_srcdir}$try" >&2
if test $try != $xsrcdir$name_base/$x && test -d $try_srcdir$try;
then
eval "${implies_type}=\"\$${implies_type} \$try\""
found=yes
fi
if test $found = no; then
AC_MSG_WARN($name/$implies_file specifies nonexistent $x)
fi
done
fi
done
# Add NAME to the list of names.
names="$names $name"
# Find the parent of NAME, using the empty string if it has none.
changequote(,)dnl
parent="`echo $name | sed -n -e 's=/[^/]*$==' -e '/sysdeps$/q' -e p`"
changequote([,])dnl
test -n "$enable_debug_configure" &&
echo "[DEBUG]: $name Implies='$Implies' rest='$*' parent='$parent' \
Implies_before='$Implies_before' Implies_after='$Implies_after'" >&2