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glibc/configure.ac
Frédéric Bérat 64d9580cdf Allow glibc to be built with _FORTIFY_SOURCE 
Add --enable-fortify-source option.

It is now possible to enable fortification through a configure option.
The level may be given as parameter, if none is provided, the configure
script will determine what is the highest level possible that can be set
considering GCC built-ins availability and set it.
If level is explicitly set to 3, configure checks if the compiler
supports the built-in function necessary for it or raise an error if it
isn't.

If the configure option isn't explicitly enabled, it _FORTIFY_SOURCE is
forcibly undefined (and therefore disabled).

The result of the configure checks are new variables, ${fortify_source}
and ${no_fortify_source} that can be used to appropriately populate
CFLAGS.

A dedicated patch will follow to make use of this variable in Makefiles
when necessary.

Updated NEWS and INSTALL.

Adding dedicated x86_64 variant that enables the configuration.

Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
2023-07-05 16:59:34 +02:00

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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],
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[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])
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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
dnl For the development we sometimes want gcc to issue even more warnings.
dnl This is not the default since many of the extra warnings are not
dnl appropriate.
AC_ARG_ENABLE([all-warnings],
AS_HELP_STRING([--enable-all-warnings],
[enable all useful warnings gcc can issue]),
[all_warnings=$enableval],
[])
AC_SUBST(all_warnings)
AC_ARG_ENABLE([werror],
AS_HELP_STRING([--disable-werror],
[do not build with -Werror]),
[enable_werror=$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 $host_cpu in
aarch64)
AC_DEFINE(USE_MTAG)
;;
esac
fi
AC_SUBST(memory_tagging)
AC_ARG_ENABLE([crypt],
AS_HELP_STRING([--disable-crypt],
[do not build nor install the passphrase hashing library, libcrypt]),
[build_crypt=$enableval],
[build_crypt=yes])
AC_SUBST(build_crypt)
AC_ARG_ENABLE([nss-crypt],
AS_HELP_STRING([--enable-nss-crypt],
[enable libcrypt to use nss]),
[nss_crypt=$enableval],
[nss_crypt=no])
if test x$build_libcrypt = xno && test x$nss_crypt = xyes; then
AC_MSG_WARN([--enable-nss-crypt has no effect when libcrypt is disabled])
nss_crypt=no
fi
if test x$nss_crypt = xyes; then
nss_includes=-I$(nss-config --includedir 2>/dev/null)
if test $? -ne 0; then
AC_MSG_ERROR([cannot find include directory with nss-config])
fi
nspr_includes=-I$(nspr-config --includedir 2>/dev/null)
if test $? -ne 0; then
AC_MSG_ERROR([cannot find include directory with nspr-config])
fi
old_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS $nss_includes $nspr_includes"
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
#include <hasht.h>
#include <nsslowhash.h>
void f (void) { NSSLOW_Init (); }])],
libc_cv_nss_crypt=yes,
AC_MSG_ERROR([
cannot find NSS headers with lowlevel hash function interfaces]))
old_LIBS="$LIBS"
old_LDFLAGS="$LDFLAGS"
LIBS="$LIBS -lfreebl3"
AC_LINK_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
#include <hasht.h>
#include <nsslowhash.h>],
[NSSLOW_Init();])],
libc_cv_nss_crypt=yes,
AC_MSG_ERROR([
cannot link program using lowlevel NSS hash functions]))
# Check to see if there is a static NSS cryptographic library.
# If there isn't then we can't link anything with libcrypt.a,
# and that might mean disabling some static tests.
LDFLAGS="$LDFLAGS -static"
AC_LINK_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
#include <hasht.h>
#include <nsslowhash.h>],
[NSSLOW_Init();])],
libc_cv_static_nss_crypt=yes,
libc_cv_static_nss_crypt=no)
LDFLAGS="$old_LDFLAGS"
CFLAGS="$old_CFLAGS"
LIBS="$old_LIBS"
else
libc_cv_nss_crypt=no
libc_cv_static_nss_crypt=no
fi
AC_SUBST(libc_cv_nss_crypt)
AC_SUBST(libc_cv_static_nss_crypt)
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],
AC_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
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
# Add the names implied by NAME, and NAME's parent (if it has one), to
# the list of names to be processed (the argument list). We prepend the
# implied names to the list and append the parent. We want implied
# directories to come before further directories inferred from the
# configuration components; this ensures that for sysv4, unix/common
# (implied by unix/sysv/sysv4) comes before unix/sysv (in ostry (here $*)
# after sysv4).
sysnames="`echo $Implies $* $Implies_before $parent $Implies_after`"
test -n "$sysnames" && set $sysnames
done
# Add the default directories.
default_sysnames="sysdeps/generic"
sysnames="$names $default_sysnames"
AC_SUBST(sysnames)
# The other names were emitted during the scan.
AC_MSG_RESULT($default_sysnames)
# if using special system headers, find out the compiler's sekrit
# header directory and add that to the list. NOTE: Only does the right
# thing on a system that doesn't need fixincludes. (Not presently a problem.)
if test -n "$sysheaders"; then
SYSINCLUDES=-nostdinc
for d in include include-fixed; do
i=`$CC -print-file-name="$d"` && test "x$i" != x && test "x$i" != "x$d" &&
SYSINCLUDES="$SYSINCLUDES -isystem $i"
done
SYSINCLUDES="$SYSINCLUDES \
-isystem `echo $sysheaders | sed 's/:/ -isystem /g'`"
if test -n "$CXX"; then
CXX_SYSINCLUDES=
for cxxheaders in `$CXX -v -S -x c++ /dev/null -o /dev/null 2>&1 \
| sed -n -e '1,/#include/d' -e 's/^ \(\/.*\/[cg]++\)/\1/p'`; do
test "x$cxxheaders" != x &&
CXX_SYSINCLUDES="$CXX_SYSINCLUDES -isystem $cxxheaders"
done
fi
fi
AC_SUBST(SYSINCLUDES)
AC_SUBST(CXX_SYSINCLUDES)
# Obtain some C++ header file paths. This is used to make a local
# copy of those headers in Makerules.
if test -n "$CXX"; then
find_cxx_header () {
echo "#include <$1>" | $CXX -H -fsyntax-only -x c++ - 2>&1 \
| $AWK '$1 == "."{print $2}'
}
CXX_CSTDLIB_HEADER="$(find_cxx_header cstdlib)"
CXX_CMATH_HEADER="$(find_cxx_header cmath)"
CXX_BITS_STD_ABS_H="$(find_cxx_header bits/std_abs.h)"
fi
AC_SUBST(CXX_CSTDLIB_HEADER)
AC_SUBST(CXX_CMATH_HEADER)
AC_SUBST(CXX_BITS_STD_ABS_H)
# Test if LD_LIBRARY_PATH contains the notation for the current directory
# since this would lead to problems installing/building glibc.
# LD_LIBRARY_PATH contains the current directory if one of the following
# is true:
# - one of the terminals (":" and ";") is the first or last sign
# - two terminals occur directly after each other
# - the path contains an element with a dot in it
AC_MSG_CHECKING(LD_LIBRARY_PATH variable)
changequote(,)dnl
case ${LD_LIBRARY_PATH} in
[:\;]* | *[:\;] | *[:\;][:\;]* | *[:\;]. | .[:\;]*| . | *[:\;].[:\;]* )
ld_library_path_setting="contains current directory"
;;
*)
ld_library_path_setting="ok"
;;
esac
changequote([,])dnl
AC_MSG_RESULT($ld_library_path_setting)
if test "$ld_library_path_setting" != "ok"; then
AC_MSG_ERROR([
*** LD_LIBRARY_PATH shouldn't contain the current directory when
*** building glibc. Please change the environment variable
*** and run configure again.])
fi
AC_PATH_PROG(BASH_SHELL, bash, no)
AC_PATH_PROG(PERL, perl, no)
if test "$PERL" != no &&
(eval `$PERL -V:apiversion`; test `expr "$apiversion" \< 5` -ne 0); then
PERL=no
fi
AC_PATH_PROG(INSTALL_INFO, install-info, no,
$PATH:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin)
AC_CACHE_CHECK(for .set assembler directive, libc_cv_asm_set_directive, [dnl
cat > conftest.s <<EOF
.text
foo:
.set glibc_conftest_frobozz,foo
.globl glibc_conftest_frobozz
EOF
# The alpha-dec-osf1 assembler gives only a warning for `.set'
# (but it doesn't work), so we must do a linking check to be sure.
cat > conftest1.c <<\EOF
extern int glibc_conftest_frobozz;
void _start() { glibc_conftest_frobozz = 1; }
EOF
if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
-nostartfiles -nostdlib $no_ssp \
-o conftest conftest.s conftest1.c 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
libc_cv_asm_set_directive=yes
else
libc_cv_asm_set_directive=no
fi
rm -f conftest*])
if test $libc_cv_asm_set_directive = yes; then
AC_DEFINE(HAVE_ASM_SET_DIRECTIVE)
fi
AC_CACHE_CHECK(linker support for protected data symbol,
libc_cv_protected_data,
[cat > conftest.c <<EOF
int bar __attribute__ ((visibility ("protected"))) = 1;
EOF
libc_cv_protected_data=no
if AC_TRY_COMMAND(${CC-cc} -nostdlib -nostartfiles $no_ssp -fPIC -shared conftest.c -o conftest.so); then
cat > conftest.c <<EOF
extern int bar;
int main (void) { return bar; }
EOF
if AC_TRY_COMMAND(${CC-cc} -nostdlib -nostartfiles $no_ssp conftest.c -o conftest conftest.so); then
libc_cv_protected_data=yes
fi
fi
rm -f conftest.*
])
AC_SUBST(libc_cv_protected_data)
AC_CACHE_CHECK(linker support for INSERT in linker script,
libc_cv_insert,
[cat > conftest.c <<EOF
int __attribute__ ((section(".bar"))) bar = 0x12345678;
int test (void) { return bar; }
EOF
cat > conftest.t <<EOF
SECTIONS
{
.bar : { *(.bar) }
}
INSERT AFTER .rela.dyn;
EOF
libc_cv_insert=no
if AC_TRY_COMMAND([${CC-cc} -nostdlib -nostartfiles $no_ssp -fPIC -shared conftest.c -Wl,-T,conftest.t -o conftest.so]); then
libc_cv_insert=yes
fi
rm -f conftest.*
])
AC_SUBST(libc_cv_insert)
AC_CACHE_CHECK(for broken __attribute__((alias())),
libc_cv_broken_alias_attribute,
[cat > conftest.c <<EOF
extern int foo (int x) __asm ("xyzzy");
int bar (int x) { return x; }
extern __typeof (bar) foo __attribute ((weak, alias ("bar")));
extern int dfoo;
extern __typeof (dfoo) dfoo __asm ("abccb");
int dfoo = 1;
EOF
libc_cv_broken_alias_attribute=yes
if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
if grep 'xyzzy' conftest.s >/dev/null &&
grep 'abccb' conftest.s >/dev/null; then
libc_cv_broken_alias_attribute=no
fi
fi
rm -f conftest.c conftest.s
])
if test $libc_cv_broken_alias_attribute = yes; then
AC_MSG_ERROR(working alias attribute support required)
fi
AC_CACHE_CHECK(whether to put _rtld_local into .sdata section,
libc_cv_have_sdata_section,
[echo "int i;" > conftest.c
libc_cv_have_sdata_section=no
if ${CC-cc} $LDFLAGS -fPIC -shared -Wl,--verbose conftest.c -o conftest.so 2>&1 \
| grep '\.sdata' >/dev/null; then
libc_cv_have_sdata_section=yes
fi
rm -f conftest.c conftest.so
])
if test $libc_cv_have_sdata_section = yes; then
AC_DEFINE(HAVE_SDATA_SECTION)
fi
AC_CACHE_CHECK(for libunwind-support in compiler,
libc_cv_cc_with_libunwind, [
cat > conftest.c <<EOF
int main (void) { return 0; }
EOF
if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -static -o conftest \
conftest.c -v 2>&1 >/dev/null | grep ' -lunwind ' >/dev/null; then
libc_cv_cc_with_libunwind=yes
else
libc_cv_cc_with_libunwind=no
fi
rm -f conftest*])
AC_SUBST(libc_cv_cc_with_libunwind)
if test $libc_cv_cc_with_libunwind = yes; then
AC_DEFINE(HAVE_CC_WITH_LIBUNWIND)
fi
ASFLAGS_config=
AC_CACHE_CHECK(whether --noexecstack is desirable for .S files,
libc_cv_as_noexecstack, [dnl
cat > conftest.c <<EOF
void foo (void) { }
EOF
if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS
-S -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD]) \
&& grep .note.GNU-stack conftest.s >/dev/null \
&& AC_TRY_COMMAND([${CC-cc} $ASFLAGS -Wa,--noexecstack
-c -o conftest.o conftest.s 1>&AS_MESSAGE_LOG_FD])
then
libc_cv_as_noexecstack=yes
else
libc_cv_as_noexecstack=no
fi
rm -f conftest*])
if test $libc_cv_as_noexecstack = yes; then
ASFLAGS_config="$ASFLAGS_config -Wa,--noexecstack"
fi
AC_SUBST(ASFLAGS_config)
LIBC_LINKER_FEATURE([-z execstack], [-Wl,-z,execstack],
[libc_cv_z_execstack=yes], [libc_cv_z_execstack=no])
AC_SUBST(libc_cv_z_execstack)
LIBC_LINKER_FEATURE([-z start-stop-gc], [-Wl,-z,start-stop-gc],
[libc_cv_z_start_stop_gc=yes], [libc_cv_z_start_stop_gc=no])
LIBC_CONFIG_VAR([have-z-start-stop-gc], [$libc_cv_z_start_stop_gc])
LIBC_LINKER_FEATURE([--depaudit], [-Wl,--depaudit,x],
[libc_cv_depaudit=yes], [libc_cv_depaudit=no])
LIBC_CONFIG_VAR([have-depaudit], [$libc_cv_depaudit])
LIBC_LINKER_FEATURE([-z pack-relative-relocs],
[-Wl,-z,pack-relative-relocs],
[libc_cv_dt_relr=yes], [libc_cv_dt_relr=no])
LIBC_CONFIG_VAR([have-dt-relr], [$libc_cv_dt_relr])
LIBC_LINKER_FEATURE([--no-dynamic-linker],
[-Wl,--no-dynamic-linker],
[libc_cv_no_dynamic_linker=yes],
[libc_cv_no_dynamic_linker=no])
LIBC_CONFIG_VAR([have-no-dynamic-linker], [$libc_cv_no_dynamic_linker])
AC_CACHE_CHECK(for -static-pie, libc_cv_static_pie, [dnl
LIBC_TRY_CC_OPTION([-static-pie],
[libc_cv_static_pie=yes],
[libc_cv_static_pie=no])
])
LIBC_CONFIG_VAR([have-static-pie], [$libc_cv_static_pie])
AC_CACHE_CHECK(for -fpie, libc_cv_fpie, [dnl
LIBC_TRY_CC_OPTION([-fpie], [libc_cv_fpie=yes], [libc_cv_fpie=no])
])
AC_SUBST(libc_cv_fpie)
AC_CACHE_CHECK(for GLOB_DAT reloc,
libc_cv_has_glob_dat, [dnl
cat > conftest.c <<EOF
extern int mumble;
int foo (void) { return mumble; }
EOF
if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
-fPIC -shared -o conftest.so conftest.c
-nostdlib -nostartfiles $no_ssp
1>&AS_MESSAGE_LOG_FD])
then
dnl look for GLOB_DAT relocation.
if $READELF -rW conftest.so | grep '_GLOB_DAT' > /dev/null; then
libc_cv_has_glob_dat=yes
else
libc_cv_has_glob_dat=no
fi
else
libc_cv_has_glob_dat=no
fi
rm -f conftest*])
AC_SUBST(libc_cv_has_glob_dat)
AC_CACHE_CHECK([for -mtls-dialect=gnu2], libc_cv_mtls_dialect_gnu2,
[dnl
cat > conftest.c <<EOF
__thread int i;
void foo (void)
{
i = 10;
}
EOF
if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -fPIC -mtls-dialect=gnu2 -nostdlib -nostartfiles
conftest.c -o conftest 1>&AS_MESSAGE_LOG_FD])
then
libc_cv_mtls_dialect_gnu2=yes
else
libc_cv_mtls_dialect_gnu2=no
fi
rm -f conftest*])
AC_SUBST(libc_cv_mtls_dialect_gnu2)
LIBC_CONFIG_VAR([have-mtls-dialect-gnu2], [$libc_cv_mtls_dialect_gnu2])
dnl clang emits an warning for a double alias redirection, to warn the
dnl original symbol is sed even when weak definition overrides it.
dnl It is a usual pattern for weak_alias, where multiple alias point to
dnl same symbol.
AC_CACHE_CHECK([if -Wno-ignored-attributes is required for aliases],
libc_cv_wno_ignored_attributes, [dnl
cat > conftest.c <<EOF
void __foo (void)
{
}
extern __typeof (__foo) foo __attribute__ ((weak, alias ("__foo")));
extern __typeof (__foo) bar __attribute__ ((weak, alias ("foo")));
EOF
libc_cv_wno_ignored_attributes=""
if ! AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -Werror -c conftest.c])
then
libc_cv_wno_ignored_attributes="-Wno-ignored-attributes"
fi
rm -f conftest*])
LIBC_CONFIG_VAR([config-cflags-wno-ignored-attributes],
[$libc_cv_wno_ignored_attributes])
AC_CACHE_CHECK(whether cc puts quotes around section names,
libc_cv_have_section_quotes,
[cat > conftest.c <<EOF
static const int foo
__attribute__ ((section ("bar"))) = 1;
EOF
if ${CC-cc} -S conftest.c -o conftest.s; then
if grep '\.section.*"bar"' conftest.s >/dev/null; then
libc_cv_have_section_quotes=yes
else
libc_cv_have_section_quotes=no
fi
else
libc_cv_have_section_quotes=unknown
fi
rm -f conftest.{c,s}
])
if test $libc_cv_have_section_quotes = yes; then
AC_DEFINE(HAVE_SECTION_QUOTES)
fi
AC_CACHE_CHECK(for __builtin_memset, libc_cv_gcc_builtin_memset, [dnl
cat > conftest.c <<\EOF
void zero (void *x)
{
__builtin_memset (x, 0, 1000);
}
EOF
dnl
if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | grep -F "memset" > /dev/null]);
then
libc_cv_gcc_builtin_memset=no
else
libc_cv_gcc_builtin_memset=yes
fi
rm -f conftest* ])
if test "$libc_cv_gcc_builtin_memset" = yes ; then
AC_DEFINE(HAVE_BUILTIN_MEMSET)
fi
AC_CACHE_CHECK(for redirection of built-in functions, libc_cv_gcc_builtin_redirection, [dnl
cat > conftest.c <<\EOF
extern char *strstr (const char *, const char *) __asm ("my_strstr");
char *foo (const char *a, const char *b)
{
return __builtin_strstr (a, b);
}
EOF
dnl
if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | grep -F "my_strstr" > /dev/null]);
then
libc_cv_gcc_builtin_redirection=yes
else
libc_cv_gcc_builtin_redirection=no
fi
rm -f conftest* ])
if test "$libc_cv_gcc_builtin_redirection" = no; then
AC_MSG_ERROR([support for the symbol redirection needed])
fi
dnl Determine how to disable generation of FMA instructions.
AC_CACHE_CHECK([for compiler option to disable generation of FMA instructions],
libc_cv_cc_nofma, [dnl
libc_cv_cc_nofma=
for opt in -ffp-contract=off -mno-fused-madd; do
LIBC_TRY_CC_OPTION([$opt], [libc_cv_cc_nofma=$opt; break])
done])
AC_SUBST(libc_cv_cc_nofma)
if test -n "$submachine"; then
AC_CACHE_CHECK([for compiler option for CPU variant],
libc_cv_cc_submachine, [dnl
libc_cv_cc_submachine=no
for opt in "-march=$submachine" "-mcpu=$submachine"; do
LIBC_TRY_CC_OPTION([$opt], [
libc_cv_cc_submachine="$opt"
break], [])
done])
if test "x$libc_cv_cc_submachine" = xno; then
AC_MSG_ERROR([${CC-cc} does not support $submachine])
fi
fi
AC_SUBST(libc_cv_cc_submachine)
dnl Determine if compiler supports -fsignaling-nans
AC_CACHE_CHECK([for compiler option that -fsignaling-nans],
libc_cv_cc_signaling_nans, [dnl
LIBC_TRY_CC_OPTION([-Werror -fsignaling-nans],
[libc_cv_cc_signaling_nans=-fsignaling-nans],
[libc_cv_cc_signaling_nans=])
])
LIBC_CONFIG_VAR([config-cflags-signaling-nans],
[$libc_cv_cc_signaling_nans])
AC_CACHE_CHECK(if $CC accepts -fno-tree-loop-distribute-patterns with \
__attribute__ ((__optimize__)), libc_cv_cc_loop_to_function, [dnl
cat > conftest.c <<EOF
void
__attribute__ ((__optimize__ ("-fno-tree-loop-distribute-patterns")))
foo (void) {}
EOF
libc_cv_cc_loop_to_function=no
if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c])
then
libc_cv_cc_loop_to_function=yes
fi
rm -f conftest*])
if test $libc_cv_cc_loop_to_function = yes; then
AC_DEFINE(HAVE_CC_INHIBIT_LOOP_TO_LIBCALL)
fi
AC_SUBST(libc_cv_cc_loop_to_function)
dnl Check whether we have the gd library available.
AC_MSG_CHECKING(for libgd)
if test "$with_gd" != "no"; then
old_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS $libgd_include"
old_LDFLAGS="$LDFLAGS"
LDFLAGS="$LDFLAGS $libgd_ldflags"
old_LIBS="$LIBS"
LIBS="$LIBS -lgd -lpng -lz -lm"
AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <gd.h>]], [[gdImagePng (0, 0)]])],
[LIBGD=yes], [LIBGD=no])
CFLAGS="$old_CFLAGS"
LDFLAGS="$old_LDFLAGS"
LIBS="$old_LIBS"
else
LIBGD=no
fi
AC_MSG_RESULT($LIBGD)
AC_SUBST(LIBGD)
# SELinux detection
if test x$with_selinux = xno ; then
have_selinux=no;
else
# See if we have the SELinux library
AC_CHECK_LIB(selinux, is_selinux_enabled,
have_selinux=yes, have_selinux=no)
if test x$with_selinux = xyes ; then
if test x$have_selinux = xno ; then
AC_MSG_ERROR([SELinux explicitly required, but SELinux library not found])
fi
fi
fi
# Check if we're building with SELinux support.
if test "x$have_selinux" = xyes; then
AC_DEFINE(HAVE_SELINUX, 1, [SELinux support])
# See if we have the libaudit library
AC_CHECK_LIB(audit, audit_log_user_avc_message,
have_libaudit=yes, have_libaudit=no)
if test "x$have_libaudit" = xyes; then
AC_DEFINE(HAVE_LIBAUDIT, 1, [SELinux libaudit support])
fi
AC_SUBST(have_libaudit)
# See if we have the libcap library
AC_CHECK_LIB(cap, cap_init, have_libcap=yes, have_libcap=no)
if test "x$have_libcap" = xyes; then
AC_DEFINE(HAVE_LIBCAP, 1, [SELinux libcap support])
fi
AC_SUBST(have_libcap)
fi
AC_SUBST(have_selinux)
dnl Check if we support the requested _FORTIFY_SOURCE level
dnl If not, then don't use it.
dnl Note that _FORTIFY_SOURCE may have been set through FLAGS too.
dnl _FORTIFY_SOURCE value will be selectively disabled for function that can't
dnl support it
no_fortify_source="-Wp,-U_FORTIFY_SOURCE"
fortify_source="${no_fortify_source}"
AC_CACHE_CHECK([for __builtin_dynamic_object_size], [libc_cv___builtin_dynamic_object_size], [
AC_LINK_IFELSE([AC_LANG_PROGRAM([], [__builtin_dynamic_object_size("", 0)])],
[libc_cv___builtin_dynamic_object_size=yes
AS_IF([test "$enable_fortify_source" = yes], [enable_fortify_source=3])],
[libc_cv___builtin_dynamic_object_size=no
AS_IF([test "$enable_fortify_source" = yes], [enable_fortify_source=2])])
])
AS_CASE([$enable_fortify_source],
[1|2], [libc_cv_fortify_source=yes],
[3], [AS_IF([test "$libc_cv___builtin_dynamic_object_size" = yes],
[libc_cv_fortify_source=yes],
[AC_MSG_ERROR([Compiler doesn't provide necessary support for _FORTIFY_SOURCE=3])])],
[libc_cv_fortify_source=no])
AS_IF([test "$libc_cv_fortify_source" = yes],
[fortify_source="${fortify_source},-D_FORTIFY_SOURCE=${enable_fortify_source}"]
)
AC_SUBST(enable_fortify_source)
AC_SUBST(libc_cv_fortify_source)
AC_SUBST(no_fortify_source)
AC_SUBST(fortify_source)
dnl Starting with binutils 2.35, GAS can attach multiple symbol versions
dnl to one symbol (PR 23840).
AC_CACHE_CHECK(whether the assembler requires one version per symbol,
libc_cv_symver_needs_alias, [dnl
cat > conftest.s <<EOF
.text
testfunc:
.globl testfunc
.symver testfunc, testfunc1@VERSION1
.symver testfunc, testfunc1@VERSION2
EOF
libc_cv_symver_needs_alias=no
if ${CC-cc} $ASFLAGS -c conftest.s 2>&AS_MESSAGE_LOG_FD; then
libc_cv_symver_needs_alias=no
else
libc_cv_symver_needs_alias=yes
fi
rm conftest.*
])
if test "$libc_cv_symver_needs_alias" = yes; then
AC_DEFINE(SYMVER_NEEDS_ALIAS)
fi
AC_CACHE_CHECK(for __builtin_trap with no external dependencies,
libc_cv_builtin_trap, [dnl
libc_cv_builtin_trap=no
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[__builtin_trap ()]])],[
libc_undefs=`$NM -u conftest.o |
LC_ALL=C $AWK '$1 == "U" { print $2 | "sort -u"; next } { exit(1) }' \
2>&AS_MESSAGE_LOG_FD` || {
AC_MSG_ERROR([confusing output from $NM -u])
}
echo >&AS_MESSAGE_LOG_FD "libc_undefs='$libc_undefs'"
if test -z "$libc_undefs"; then
libc_cv_builtin_trap=yes
fi],[])])
if test $libc_cv_builtin_trap = yes; then
AC_DEFINE([HAVE_BUILTIN_TRAP])
fi
dnl C++ feature tests.
AC_LANG_PUSH([C++])
AC_CACHE_CHECK([whether the C++ compiler supports thread_local],
libc_cv_cxx_thread_local, [
old_CXXFLAGS="$CXXFLAGS"
CXXFLAGS="$CXXFLAGS -std=gnu++11"
AC_COMPILE_IFELSE([AC_LANG_SOURCE([
#include <thread>
// Compiler support.
struct S
{
S ();
~S ();
};
thread_local S s;
S * get () { return &s; }
// libstdc++ support.
#ifndef _GLIBCXX_HAVE___CXA_THREAD_ATEXIT_IMPL
#error __cxa_thread_atexit_impl not supported
#endif
])],
[libc_cv_cxx_thread_local=yes],
[libc_cv_cxx_thread_local=no])
CXXFLAGS="$old_CXXFLAGS"
])
AC_SUBST(libc_cv_cxx_thread_local)
AC_LANG_POP([C++])
dnl End of C++ feature tests.
### End of automated tests.
### Now run sysdeps configure fragments.
# They also can set these variables.
use_ldconfig=no
ldd_rewrite_script=no
libc_cv_sysconfdir=$sysconfdir
libc_cv_localstatedir=$localstatedir
libc_cv_gcc_unwind_find_fde=no
libc_cv_idn=no
pthread_in_libc=yes
# Iterate over all the sysdep directories we will use, running their
# configure fragments.
for dir in $sysnames; do
case $dir in
/*) dest=$dir ;;
*) dest=$srcdir/$dir ;;
esac
if test -r $dest/configure; then
AC_MSG_RESULT(running configure fragment for $dir)
. $dest/configure
fi
done
if test x"$build_mathvec" = xnotset; then
build_mathvec=no
fi
LIBC_CONFIG_VAR([build-mathvec], [$build_mathvec])
AC_SUBST(libc_extra_cflags)
AC_SUBST(libc_extra_cppflags)
if test x$libc_cv_gcc_unwind_find_fde = xyes; then
AC_DEFINE(EXPORT_UNWIND_FIND_FDE)
fi
AC_SUBST(libc_cv_gcc_unwind_find_fde)
# A sysdeps configure fragment can reset this if IFUNC is not actually
# usable even though the assembler knows how to generate the symbol type.
if test x"$libc_cv_ld_gnu_indirect_function" = xyes; then
AC_DEFINE(HAVE_IFUNC)
fi
LIBC_CONFIG_VAR([have-ifunc], [$libc_cv_ld_gnu_indirect_function])
if test x"$libc_cv_gcc_indirect_function" = xyes; then
AC_DEFINE(HAVE_GCC_IFUNC)
fi
LIBC_CONFIG_VAR([have-gcc-ifunc], [$libc_cv_gcc_indirect_function])
# This is far from the AC_ARG_ENABLE that sets it so that a sysdeps
# configure fragment can override the value to prevent this AC_DEFINE.
AC_SUBST(use_nscd)
if test "x$use_nscd" != xno; then
AC_DEFINE([USE_NSCD])
fi
if test "x$build_nscd" = xdefault; then
build_nscd=$use_nscd
fi
AC_SUBST(libc_cv_slibdir)
AC_SUBST(libc_cv_rtlddir)
AC_SUBST(libc_cv_complocaledir)
AC_SUBST(libc_cv_sysconfdir)
AC_SUBST(libc_cv_localstatedir)
AC_SUBST(libc_cv_rootsbindir)
if test x$use_ldconfig = xyes; then
AC_DEFINE(USE_LDCONFIG)
fi
AC_SUBST(use_ldconfig)
AC_SUBST(ldd_rewrite_script)
AC_SUBST(static)
AC_SUBST(shared)
AC_CACHE_CHECK([whether -fPIC is default], libc_cv_pic_default,
[libc_cv_pic_default=yes
cat > conftest.c <<EOF
#if defined __PIC__ || defined __pic__ || defined PIC || defined pic
# error PIC is default.
#endif
EOF
if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
libc_cv_pic_default=no
fi
rm -f conftest.*])
LIBC_CONFIG_VAR([build-pic-default], [$libc_cv_pic_default])
AC_CACHE_CHECK([whether -fPIE is default], libc_cv_cc_pie_default,
[libc_cv_cc_pie_default=yes
cat > conftest.c <<EOF
#if defined __PIE__ || defined __pie__ || defined PIE || defined pie
# error PIE is default.
#endif
EOF
if eval "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
libc_cv_cc_pie_default=no
fi
rm -f conftest.*])
LIBC_CONFIG_VAR([cc-pie-default], [$libc_cv_cc_pie_default])
AC_MSG_CHECKING(if we can build programs as PIE)
AC_COMPILE_IFELSE([AC_LANG_SOURCE([[#ifdef PIE_UNSUPPORTED
# error PIE is not supported
#endif]])], [libc_cv_pie_supported=yes], [libc_cv_pie_supported=no])
AC_MSG_RESULT($libc_cv_pie_supported)
# Disable build-pie-default if target does not support it or glibc is
# configured with --disable-default-pie.
if test "x$default_pie" = xno; then
build_pie_default=no
else
build_pie_default=$libc_cv_pie_supported
fi
LIBC_CONFIG_VAR([build-pie-default], [$build_pie_default])
AC_MSG_CHECKING(if we can build static PIE programs)
libc_cv_static_pie_supported=$libc_cv_pie_supported
if test "x$libc_cv_pie_supported" != xno \
-a "$libc_cv_no_dynamic_linker" = yes; then
AC_COMPILE_IFELSE([AC_LANG_SOURCE([[#ifndef SUPPORT_STATIC_PIE
# error static PIE is not supported
#endif]])], [libc_cv_static_pie_supported=yes],
[libc_cv_static_pie_supported=no])
fi
AC_MSG_RESULT($libc_cv_static_pie_supported)
# Enable static-pie only if it is available and glibc isn't configured
# with --disable-default-pie.
if test "x$default_pie" = xno; then
libc_cv_static_pie=no
else
libc_cv_static_pie=$libc_cv_static_pie_supported
fi
if test "$libc_cv_static_pie" = "yes"; then
AC_DEFINE(ENABLE_STATIC_PIE)
fi
LIBC_CONFIG_VAR([enable-static-pie], [$libc_cv_static_pie])
# Set the `multidir' variable by grabbing the variable from the compiler.
# We do it once and save the result in a generated makefile.
libc_cv_multidir=`${CC-cc} $CFLAGS $CPPFLAGS -print-multi-directory`
AC_SUBST(libc_cv_multidir)
AC_SUBST(profile)
AC_SUBST(static_nss)
AC_SUBST(DEFINES)
dnl See sysdeps/mach/configure.ac for this variable.
AC_SUBST(mach_interface_list)
VERSION=`sed -n -e 's/^#define VERSION "\([^"]*\)"/\1/p' < $srcdir/version.h`
RELEASE=`sed -n -e 's/^#define RELEASE "\([^"]*\)"/\1/p' < $srcdir/version.h`
AC_SUBST(VERSION)
AC_SUBST(RELEASE)
if test "$pthread_in_libc" = yes; then
AC_DEFINE(PTHREAD_IN_LIBC)
fi
AC_SUBST(pthread_in_libc)
AC_CONFIG_FILES([config.make Makefile])
AC_CONFIG_COMMANDS([default],[[
case $CONFIG_FILES in *config.make*)
echo "$config_vars" >> config.make;;
esac
test -d bits || mkdir bits]],[[config_vars='$config_vars']])
AC_OUTPUT
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