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)], [http://sourceware.org/bugzilla/], [glibc])
+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([http://www.gnu.org/software/libc/bugs.html])
+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"],
# We require GCC, and by default use its preprocessor. Override AC_PROG_CPP
# here to work around the Autoconf issue discussed in
-# <http://sourceware.org/ml/libc-alpha/2013-01/msg00721.html>.
+# <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
# We require GCC. Override _AC_PROG_CC_C89 here to work around the Autoconf
# issue discussed in
-# <http://sourceware.org/ml/libc-alpha/2013-01/msg00757.html>.
+# <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 $subdirs directly based on configure fragments.
fi
dnl Arguments to specify presence of other packages/features.
-AC_ARG_WITH([fp],
- AC_HELP_STRING([--with-fp],
- [if using floating-point hardware @<:@default=yes@:>@]),
- [with_fp=$withval],
- [with_fp=yes])
-AC_SUBST(with_fp)
AC_ARG_WITH([binutils],
AC_HELP_STRING([--with-binutils=PATH],
[specify location of binutils (as and ld)]),
[use_default_link=$withval],
[use_default_link=default])
+dnl Additional build flags injection.
+AC_ARG_WITH([nonshared-cflags],
+ AC_HELP_STRING([--with-nonshared-cflags=CFLAGS],
+ [build nonshared libraries with additional CFLAGS]),
+ [extra_nonshared_cflags=$withval],
+ [extra_nonshared_cflags=])
+AC_SUBST(extra_nonshared_cflags)
+
AC_ARG_ENABLE([sanity-checks],
AC_HELP_STRING([--disable-sanity-checks],
[really do not use threads (should not be used except in special situations) @<:@default=yes@:>@]),
[build profiled library @<:@default=no@:>@]),
[profile=$enableval],
[profile=no])
+AC_ARG_ENABLE([static-pie],
+ AC_HELP_STRING([--enable-static-pie],
+ [enable static PIE support and use it in the testsuite @<:@default=no@:>@]),
+ [static_pie=$enableval],
+ [static_pie=no])
AC_ARG_ENABLE([timezone-tools],
AC_HELP_STRING([--disable-timezone-tools],
[do not install timezone tools @<:@default=install@:>@]),
AC_DEFINE(ENABLE_STACKGUARD_RANDOMIZE)
fi
-AC_ARG_ENABLE([lock-elision],
- AC_HELP_STRING([--enable-lock-elision[=yes/no]],
- [Enable lock elision for pthread mutexes by default]),
- [enable_lock_elision=$enableval],
- [enable_lock_elision=no])
-AC_SUBST(enable_lock_elision)
-if test "$enable_lock_elision" = yes ; then
- AC_DEFINE(ENABLE_LOCK_ELISION)
-fi
-
-dnl Generic infrastructure for drop-in additions to libc.
-AC_ARG_ENABLE([add-ons],
- AC_HELP_STRING([--enable-add-ons@<:@=DIRS...@:>@],
- [configure and build add-ons in DIR1,DIR2,...
- search for add-ons if no parameter given]),
- , [enable_add_ons=yes])
-
AC_ARG_ENABLE([hidden-plt],
AC_HELP_STRING([--disable-hidden-plt],
[do not hide internal function calls to avoid PLT]),
AC_DEFINE(BIND_NOW)
fi
+dnl Build glibc with -fstack-protector, -fstack-protector-all, or
+dnl -fstack-protector-strong.
+AC_ARG_ENABLE([stack-protector],
+ AC_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: \"$enable_stack_protector\"]);;
+esac
+
dnl On some platforms we cannot use dynamic loading. We must provide
dnl static NSS modules.
AC_ARG_ENABLE([static-nss],
[multi_arch=$enableval],
[multi_arch=default])
+AC_ARG_ENABLE([experimental-malloc],
+ AC_HELP_STRING([--disable-experimental-malloc],
+ [disable experimental malloc features]),
+ [experimental_malloc=$enableval],
+ [experimental_malloc=yes])
+AC_SUBST(experimental_malloc)
+
+AC_ARG_ENABLE([crypt],
+ AC_HELP_STRING([--disable-crypt],
+ [do not build nor install the passphrase hashing library, libcrypt]),
+ [build_crypt=$enableval],
+ [build_crypt=yes])
+AC_SUBST(build_crypt)
+
AC_ARG_ENABLE([nss-crypt],
AC_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 $nss_includes"
+ CFLAGS="$CFLAGS $nss_includes $nspr_includes"
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
#include <hasht.h>
#include <nsslowhash.h>
AC_MSG_ERROR([
cannot find NSS headers with lowlevel hash function interfaces]))
old_LIBS="$LIBS"
+ old_LDFLAGS="$LDFLAGS"
LIBS="$LIBS -lfreebl3"
AC_LINK_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
#include <hasht.h>
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([obsolete-rpc],
AC_DEFINE(LINK_OBSOLETE_RPC)
fi
+AC_ARG_ENABLE([obsolete-nsl],
+ AC_HELP_STRING([--enable-obsolete-nsl],
+ [build and install the obsolete libnsl library and depending NSS modules]),
+ [build_obsolete_nsl=$enableval],
+ [build_obsolete_nsl=no])
+AC_SUBST(build_obsolete_nsl)
+
+if test "$build_obsolete_nsl" = yes; then
+ AC_DEFINE(LINK_OBSOLETE_NSL)
+fi
+
AC_ARG_ENABLE([systemtap],
[AS_HELP_STRING([--enable-systemtap],
[enable systemtap static probe points @<:@default=no@:>@])],
AC_DEFINE(HAVE_PT_CHOWN)
fi
+AC_ARG_ENABLE([tunables],
+ [AS_HELP_STRING([--enable-tunables],
+ [Enable tunables support. Known values are 'yes', 'no' and 'valstring'])],
+ [have_tunables=$enableval],
+ [have_tunables=yes])
+AC_SUBST(have_tunables)
+if test "$have_tunables" = yes; then
+ AC_DEFINE(HAVE_TUNABLES)
+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
# $host_os of `gnu*' here to be `gnu-gnu*' just so that it can tell.
[build_mathvec=$enableval],
[build_mathvec=notset])
+AC_ARG_ENABLE([cet],
+ AC_HELP_STRING([--enable-cet],
+ [enable Intel Control-flow Enforcement Technology (CET), x86 only]),
+ [enable_cet=$enableval],
+ [enable_cet=no])
+
# We keep the original values in `$config_*' and never modify them, so we
# can write them unchanged into config.make. Everything else uses
# $machine, $vendor, and $os, and changes them whenever convenient.
# Some configurations imply other options.
elf=yes
-# The configure fragment of an add-on port can modify these to supplement
+# The configure fragment of a port can modify these to supplement
# or override the table in the case statement below. No fragment should
# ever change the config_* variables, however.
machine=$config_machine
# check below.
libc_config_ok=no
-dnl Let sysdeps/*/preconfigure act here, like they can in add-ons.
-LIBC_PRECONFIGURE([$srcdir], [for sysdeps])
-
-dnl Having this here, though empty, makes sure that if add-ons' fragments
-dnl do AC_CONFIG_SUBDIRS([some-dir]), which just sets $subdirs, then
-dnl our AC_OUTPUT will actually use it.
-AC_CONFIG_SUBDIRS()
-
-case "$enable_add_ons" in
-''|no) add_ons= ;;
-yes|'*')
- add_ons=`cd $srcdir && ls -d 2> /dev/null */configure */sysdeps |
- sed 's@/[[^/]]*$@@' | sort | uniq`
- add_ons_automatic=yes
- ;;
-*) add_ons=`echo "$enable_add_ons" | sed 's/,/ /g'`
- add_ons_automatic=no ;;
-esac
-
-configured_add_ons=
-add_ons_sfx=
-add_ons_pfx=
-if test x"$add_ons" != x; then
- for f in $add_ons; do
- # Some sanity checks
- case "$f" in
- crypt)
- AC_MSG_ERROR([
-*** It seems that you're using an old \`crypt' add-on. crypt is now
-*** part of glibc and using the old add-on will not work with this
-*** release. Start again with fresh sources and without the old
-*** \`crypt' add-on.])
- ;;
- localedata)
- AC_MSG_ERROR([
-*** It seems that you're using an old \`localedata' add-on. localedata
-*** is now part of glibc and using the old add-on will not work with
-*** this release. Start again with fresh sources and without the old
-*** \`localedata' add-on.])
- ;;
- esac
- done
-
- # Now source each add-on's configure fragment.
- # The fragments can use $srcdir/$libc_add_on to find themselves,
- # and test $add_ons_automatic to see if they were explicitly requested.
- # A fragment can clear (or even change) $libc_add_on to affect
- # whether it goes into the list to be actually used in the build.
- use_add_ons=
- for libc_add_on in $add_ons; do
- # Test whether such a directory really exists.
- # It can be absolute, or relative to $srcdir, or relative to the build dir.
- case "$libc_add_on" in
- /*)
- libc_add_on_srcdir=$libc_add_on
- ;;
- *)
- test -d "$srcdir/$libc_add_on" || {
- if test -d "$libc_add_on"; then
- libc_add_on="`pwd`/$libc_add_on"
- else
- AC_MSG_ERROR(add-on directory \"$libc_add_on\" does not exist)
- fi
- }
- libc_add_on_srcdir=$srcdir/$libc_add_on
- ;;
- esac
+# 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
- libc_add_on_frag=$libc_add_on_srcdir/configure
- libc_add_on_canonical=
- libc_add_on_config_subdirs=
- if test -r "$libc_add_on_frag"; then
- AC_MSG_NOTICE(running configure fragment for add-on $libc_add_on)
- libc_add_on_canonical=unknown
- libc_add_on_subdirs=
- . "$libc_add_on_frag"
- test -z "$libc_add_on" || {
- configured_add_ons="$configured_add_ons $libc_add_on"
- if test "x$libc_add_on_canonical" = xunknown; then
- AC_MSG_ERROR(fragment must set \$libc_add_on_canonical)
- fi
- for d in $libc_add_on_subdirs; do
- case "$libc_add_on" in
- /*) subdir_srcdir="$libc_add_on" ;;
- *) subdir_srcdir="\$(..)$libc_add_on" ;;
- esac
- case "$d" in
- .)
- d="${libc_add_on_canonical:-$libc_add_on}"
- ;;
- /*)
- subdir_srcdir="$d"
- ;;
- *)
- subdir_srcdir="$subdir_srcdir/$d"
- ;;
- esac
- d=`echo "$d" | sed 's@/*$@@;s@^.*/@@'`
- add_on_subdirs="$add_on_subdirs $d"
- test "$subdir_srcdir" = "\$(..)$d" || config_vars="$config_vars
-$d-srcdir = $subdir_srcdir"
- done
- for d in $libc_add_on_config_subdirs; do
- case "$d" in
- /*) AC_MSG_ERROR(dnl
-fragment uses absolute path in \$libc_add_on_config_subdirs) ;;
- esac
- if test ! -d "$libc_add_on_srcdir/$d"; then
- AC_MSG_ERROR(fragment wants to configure missing directory $d)
- fi
- case "$libc_add_on" in
- /*) AC_MSG_ERROR(dnl
-relative path required for add-on using \$libc_add_on_config_subdirs) ;;
- esac
- subdirs="$subdirs $libc_add_on/$d"
- done
- }
- fi
- if test -n "$libc_add_on"; then
- LIBC_PRECONFIGURE([$libc_add_on_srcdir], [add-on $libc_add_on for])
- use_add_ons="$use_add_ons $libc_add_on"
- add_ons_pfx="$add_ons_pfx $libc_add_on/"
- test -z "$libc_add_on_canonical" ||
- add_ons_sfx="$add_ons_sfx /$libc_add_on_canonical"
- fi
- done
- # Use echo to strip excess whitespace.
- add_ons="`echo $use_add_ons`"
-fi
-AC_SUBST(add_ons)
-AC_SUBST(add_on_subdirs)
+dnl Let sysdeps/*/preconfigure act here.
+LIBC_PRECONFIGURE([$srcdir], [for sysdeps])
###
test -n "$base_machine" || base_machine=$machine
AC_SUBST(base_machine)
+# 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
EOF
libc_cv_ld_gnu_indirect_function=no
if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
- -nostartfiles -nostdlib \
+ -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
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 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"$multi_arch" = xyes; then
AC_MSG_ERROR([--enable-multi-arch support requires assembler and linker support])
multi_arch=no
fi
fi
-if test x"$libc_cv_gcc_indirect_function" != xyes &&
- test x"$multi_arch" = xyes; then
- AC_MSG_WARN([--enable-multi-arch support recommends a gcc with gnu-indirect-function support.
+if test x"$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
while m=`echo $tail | sed 's@^\(.*\)/\([^/]*\)$@& \1@'`; test -n "$m"; do
set $m
# Prepend the machine's FPU directory unless --without-fp.
- if test "$with_fp" = yes; then
+ if test "$libc_cv_with_fp" = yes; then
maybe_fpu=/fpu
else
maybe_fpu=/nofpu
changequote([,])dnl
# Find what sysdep directories exist.
-sysnames_add_ons=
sysnames=
for b in $base ''; do
for m0 in $mach ''; do
for o in /$ostry ''; do
test "$o" = / && continue
for m in $mach ''; do
- for d in $add_ons_pfx ''; do
- for a in $add_ons_sfx ''; do
- try_suffix="$m0$b$v$o$m"
- if test -n "$try_suffix"; then
- try_srcdir="${srcdir}/"
- case "$d" in
- /*) try_srcdir= ;;
- esac
- try="${d}sysdeps$try_suffix$a"
- 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
- if test -n "$d"; then
- case "$sysnames_add_ons" in
- *" $d "*) ;;
- *|'') sysnames_add_ons="$sysnames_add_ons $d" ;;
- esac
- fi
- fi
- fi
- done
- done
+ try_suffix="$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
# If the assembler supports gnu_indirect_function symbol type and the
# architecture supports multi-arch, we enable multi-arch by default.
-case $sysnames_add_ons$sysnames in
+case $sysnames in
*"$multi_arch_d"*)
;;
*)
eval "${implies_type}=\"\$${implies_type} \$name_base/\$x\""
found=yes
fi
- for d in $add_ons_pfx ''; do
- try="${d}sysdeps/$x"
- case $d in
- /*) try_srcdir= ;;
- *) try_srcdir=$srcdir/ ;;
- esac
- test -n "$enable_debug_configure" &&
- echo "[DEBUG]: $name $implies_file $x try($d) {$try_srcdir}$try" >&2
- if test $try != $xsrcdir$name_base/$x && test -d $try_srcdir$try;
- then
- eval "${implies_type}=\"\$${implies_type} \$try\""
- found=yes
- case "$sysnames_add_ons" in
- *" $d "*) ;;
- *|'') sysnames_add_ons="$sysnames_add_ons $d" ;;
- esac
- fi
- done
+ try="sysdeps/$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 $x)
fi
# The other names were emitted during the scan.
AC_MSG_RESULT($default_sysnames)
-# Collect the list of add-ons that supply partial sysdeps trees.
-sysdeps_add_ons=
-for add_on in $add_ons; do
- case "$add_on" in
- /*) xsrcdir= ;;
- *) xsrcdir="$srcdir/" ;;
- esac
-
- test -d "$xsrcdir$add_on/sysdeps" || {
- case "$configured_add_ons " in
- *" $add_on "*) ;;
- *|'')
- AC_MSG_ERROR(add-on $add_on has no configure fragment or sysdeps tree)
- ;;
- esac
- continue
- }
-
- sysdeps_add_ons="$sysdeps_add_ons $add_on"
- case "$sysnames_add_ons" in
- *" $add_on/ "*) ;;
- *|'')
- AC_MSG_WARN(add-on $add_on contributed no sysdeps directories)
- continue ;;
- esac
-
- found=no
- for d in $sysnames; do
- case "$d" in
- $add_on/sysdeps/*) ;;
- *) continue ;;
- esac
- (cd "$xsrcdir$d" && for f in *[[!~]]; do
- case "$f" in
- sys|bits)
- for ff in $f/*.h; do
- test -d "$ff" || { test -e "$ff" && exit 88; }
- done
- ;;
- *)
- test -d "$f" || { test -e "$f" && exit 88; }
- ;;
- esac
- done)
- if test $? -eq 88; then
- found=yes
- break
- fi
- done
- if test $found = no; then
- AC_MSG_WARN(add-on $add_on contributed no useful sysdeps directories)
- fi
-done
-AC_SUBST(sysdeps_add_ons)
-
### Locate tools.
LIBC_PROG_BINUTILS
-# Accept binutils 2.22 or newer.
+# Accept binutils 2.25 or newer.
AC_CHECK_PROG_VER(AS, $AS, --version,
[GNU assembler.* \([0-9]*\.[0-9.]*\)],
- [2.1[0-9][0-9]*|2.2[2-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*],
+ [2.1[0-9][0-9]*|2.2[5-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*],
AS=: critic_missing="$critic_missing as")
-AC_CHECK_PROG_VER(LD, $LD, --version,
- [GNU ld.* \([0-9][0-9]*\.[0-9.]*\)],
- [2.1[0-9][0-9]*|2.2[2-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*],
- LD=: critic_missing="$critic_missing ld")
+
+if test -n "`$LD --version | sed -n 's/^GNU \(gold\).*$/\1/p'`"; then
+ # 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")
+else
+ 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")
+fi
# These programs are version sensitive.
AC_CHECK_TOOL_PREFIX
AC_CHECK_PROG_VER(MAKE, gnumake gmake make, --version,
[GNU Make[^0-9]*\([0-9][0-9.]*\)],
- [3.79* | 3.[89]* | [4-9].* | [1-9][0-9]*], critic_missing="$critic_missing make")
+ [[4-9].* | [1-9][0-9]*], critic_missing="$critic_missing make")
AC_CHECK_PROG_VER(MSGFMT, gnumsgfmt gmsgfmt msgfmt, --version,
[GNU gettext.* \([0-9]*\.[0-9.]*\)],
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_TRY_COMPILE([], [
-#if !defined __GNUC__ || __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 7)
+#if !defined __GNUC__ || __GNUC__ < 6 || (__GNUC__ == 6 && __GNUC_MINOR__ < 2)
#error insufficient compiler
#endif],
[libc_cv_compiler_ok=yes],
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 will be disabled.
+*** some features or tests will be disabled.
*** Check the INSTALL file for required versions.])
# if using special system headers, find out the compiler's sekrit
# copy of those headers in Makerules.
if test -n "$CXX"; then
find_cxx_header () {
- echo "#include <$1>" | $CXX -M -MP -x c++ - | sed -n "/$1:/{s/:\$//;p}"
+ echo "#include <$1>" | $CXX -M -MP -x c++ - 2>/dev/null \
+ | sed -n "\,$1:,{s/:\$//;p}"
}
CXX_CSTDLIB_HEADER="$(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.
fi
AC_PATH_PROG(INSTALL_INFO, install-info, no,
$PATH:/usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin)
-AC_CHECK_PROG_VER(BISON, bison, --version,
- [bison (GNU Bison) \([0-9]*\.[0-9.]*\)],
- [2.7*|[3-9].*|[1-9][0-9]*],
- BISON=no)
AC_CACHE_CHECK(for .set assembler directive, libc_cv_asm_set_directive, [dnl
cat > conftest.s <<EOF
void _start() { glibc_conftest_frobozz = 1; }
EOF
if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
- -nostartfiles -nostdlib \
+ -nostartfiles -nostdlib $no_ssp \
-o conftest conftest.s conftest1.c 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
libc_cv_asm_set_directive=yes
else
int bar __attribute__ ((visibility ("protected"))) = 1;
EOF
libc_cv_protected_data=no
- if AC_TRY_COMMAND(${CC-cc} -nostdlib -nostartfiles -fPIC -shared conftest.c -o conftest.so); then
+ 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 conftest.c -o conftest conftest.so); then
+ if AC_TRY_COMMAND(${CC-cc} -nostdlib -nostartfiles $no_ssp conftest.c -o conftest conftest.so); then
libc_cv_protected_data=yes
fi
fi
])
AC_SUBST(libc_cv_protected_data)
+AC_CACHE_CHECK(linker support for INSERT in linker script,
+ libc_cv_insert,
+ [cat > conftest.c <<EOF
+ const int __attribute__ ((section(".bar"))) bar = 0x12345678;
+ int test (void) { return bar; }
+EOF
+ cat > conftest.t <<EOF
+ SECTIONS
+ {
+ .bar : { *(.bar) }
+ }
+ INSERT AFTER .rela.dyn;
+EOF
+ libc_cv_insert=no
+ if AC_TRY_COMMAND([${CC-cc} -nostdlib -nostartfiles $no_ssp -fPIC -shared conftest.c -Wl,-T,conftest.t -o conftest.so]); then
+ libc_cv_insert=yes
+ fi
+ rm -f conftest.*
+ ])
+AC_SUBST(libc_cv_insert)
+
AC_CACHE_CHECK(for broken __attribute__((alias())),
libc_cv_broken_alias_attribute,
[cat > conftest.c <<EOF
int foo (void) { return bar (mumble); }
EOF
if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
- -fPIC -shared -o conftest.so conftest.c
+ -fPIC -shared $no_ssp -o conftest.so conftest.c
-nostdlib -nostartfiles
-Wl,-z,combreloc 1>&AS_MESSAGE_LOG_FD])
then
dnl cross-platform since the gcc used can be a cross compiler. Without
dnl introducing new options this is not easily doable. Instead use a tool
dnl which always is cross-platform: readelf. To detect whether -z combreloc
-dnl look for a section named .rel.dyn.
- if $READELF -S conftest.so | grep '\.rel\(a\|\)\.dyn' > /dev/null; then
+dnl look for a section named .rel.dyn or .rela.dyn.
+ if $READELF -S conftest.so | grep -E '.rela?.dyn' > /dev/null; then
libc_cv_z_combreloc=yes
else
libc_cv_z_combreloc=no
[libc_cv_z_execstack=yes], [libc_cv_z_execstack=no])
AC_SUBST(libc_cv_z_execstack)
+LIBC_LINKER_FEATURE([--no-dynamic-linker],
+ [-Wl,--no-dynamic-linker],
+ [libc_cv_no_dynamic_linker=yes],
+ [libc_cv_no_dynamic_linker=no])
+LIBC_CONFIG_VAR([have-no-dynamic-linker], [$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], [$libc_cv_static_pie])
+
AC_CACHE_CHECK(for -fpie, libc_cv_fpie, [dnl
LIBC_TRY_CC_OPTION([-fpie], [libc_cv_fpie=yes], [libc_cv_fpie=no])
])
cat > conftest.c <<EOF
int _start (void) { return 42; }
EOF
-if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
+if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS $no_ssp
-fPIC -shared -o conftest.so conftest.c
-Wl,--hash-style=both -nostdlib 1>&AS_MESSAGE_LOG_FD])
then
EOF
if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
-fPIC -shared -o conftest.so conftest.c
- -nostdlib -nostartfiles
+ -nostdlib -nostartfiles $no_ssp
1>&AS_MESSAGE_LOG_FD])
then
dnl look for GLOB_DAT relocation.
AC_CACHE_CHECK(linker output format, libc_cv_output_format, [dnl
if libc_cv_output_format=`
-${CC-cc} -nostartfiles -nostdlib -Wl,--print-output-format 2>&AS_MESSAGE_LOG_FD`
+${CC-cc} -nostartfiles -nostdlib $no_ssp -Wl,--print-output-format 2>&AS_MESSAGE_LOG_FD`
then
:
else
fi
AC_SUBST(fno_unit_at_a_time)
-AC_CACHE_CHECK(for -fstack-protector, libc_cv_ssp, [dnl
-LIBC_TRY_CC_OPTION([$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 $CPPFLAGS -Werror -fstack-protector-strong],
- [libc_cv_ssp_strong=yes],
- [libc_cv_ssp_strong=no])
-])
-
-stack_protector=
-if test "$libc_cv_ssp_strong" = "yes"; then
- stack_protector="-fstack-protector-strong"
-elif test "$libc_cv_ssp" = "yes"; then
- stack_protector="-fstack-protector"
-fi
-AC_SUBST(stack_protector)
-
AC_CACHE_CHECK([for -mtls-dialect=gnu2], libc_cv_mtls_dialect_gnu2,
[dnl
cat > conftest.c <<EOF
}
EOF
dnl
-if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | fgrep "memset" > /dev/null]);
+if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | grep -F "memset" > /dev/null]);
then
libc_cv_gcc_builtin_memset=no
else
}
EOF
dnl
-if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | fgrep "my_strstr" > /dev/null]);
+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
fi
AC_SUBST(CPPUNDEFS)
-dnl Check for silly hacked compilers inserting -fstack-protector.
-dnl This breaks badly for the early startup code we compile, since
-dnl the compiled code can refer to a magic machine-dependent location
-dnl for the canary value before we have sufficient setup for that to
-dnl work. It's also questionable to build all of libc with this flag
-dnl even when you're doing that for most applications you build, since
-dnl libc's code is so heavily-used and performance-sensitive. If we
-dnl ever really want to make that work, it should be enabled explicitly
-dnl in the libc build, not inherited from implicit compiler settings.
-AC_CACHE_CHECK([whether $CC implicitly enables -fstack-protector],
- libc_cv_predef_stack_protector, [
-AC_TRY_COMPILE([extern void foobar (char *);],
- [char large_array[2048]; foobar (large_array);], [
-libc_undefs=`$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'"
-# On some architectures, there are architecture-specific undefined
-# symbols (resolved by the linker), so filter out unknown symbols.
-# This will fail to produce the correct result if the compiler
-# defaults to -fstack-protector but this produces an undefined symbol
-# other than __stack_chk_fail or __stack_chk_fail_local. However,
-# compilers like that have not been encountered in practice.
-libc_undefs=`echo "$libc_undefs" | \
- egrep '^(foobar|__stack_chk_fail|__stack_chk_fail_local)$'`
-case "$libc_undefs" in
-foobar) libc_cv_predef_stack_protector=no ;;
-'__stack_chk_fail
-foobar'|'__stack_chk_fail_local
-foobar') libc_cv_predef_stack_protector=yes ;;
-*) AC_MSG_ERROR([unexpected symbols in test: $libc_undefs]) ;;
-esac],
- [AC_MSG_ERROR([test compilation failed])])
-])
-libc_extra_cflags=
-if test $libc_cv_predef_stack_protector = yes; then
- libc_extra_cflags="$libc_extra_cflags -fno-stack-protector"
-fi
-libc_extra_cppflags=
-
# Some linkers on some architectures support __ehdr_start but with
# bugs. Make sure usage of it does not create relocations in the
# output (as the linker should resolve them all for us).
old_LDFLAGS="$LDFLAGS"
old_LIBS="$LIBS"
CFLAGS="$CFLAGS -fPIC"
-LDFLAGS="$LDFLAGS -nostdlib -nostartfiles -shared"
+LDFLAGS="$LDFLAGS -nostdlib -nostartfiles -shared $no_ssp"
LIBS=
AC_LINK_IFELSE([AC_LANG_SOURCE([
typedef struct {
extern const Ehdr __ehdr_start __attribute__ ((visibility ("hidden")));
long ehdr (void) { return __ehdr_start.val; }
])],
- [if $READELF -r conftest | fgrep __ehdr_start >/dev/null; then
+ [if $READELF -r conftest | grep -F __ehdr_start >/dev/null; then
libc_cv_ehdr_start=broken
else
libc_cv_ehdr_start=yes
if test x"$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)
rm -f conftest.*])
AC_SUBST(libc_cv_pic_default)
-AC_CACHE_CHECK([whether -fPIE is default], libc_cv_pie_default,
-[libc_cv_pie_default=yes
+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 "${CC-cc} -S conftest.c 2>&AS_MESSAGE_LOG_FD 1>&AS_MESSAGE_LOG_FD"; then
- libc_cv_pie_default=no
+ libc_cv_cc_pie_default=no
fi
rm -f conftest.*])
+libc_cv_pie_default=$libc_cv_cc_pie_default
+AC_SUBST(libc_cv_cc_pie_default)
AC_SUBST(libc_cv_pie_default)
+# 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 $CPPFLAGS -print-multi-directory`
+AC_SUBST(libc_cv_multidir)
+
+if test "$static_pie" = yes; then
+ # The linker must support --no-dynamic-linker.
+ if test "$libc_cv_no_dynamic_linker" != yes; then
+ AC_MSG_ERROR([linker support for --no-dynamic-linker needed])
+ fi
+ # Default to PIE.
+ libc_cv_pie_default=yes
+ AC_DEFINE(ENABLE_STATIC_PIE)
+fi
+LIBC_CONFIG_VAR([enable-static-pie], [$static_pie])
+
AC_SUBST(profile)
AC_SUBST(static_nss)
projects / thirdparty / glibc.git / blobdiff