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3ce1f29594
glibc/configure.in
Ulrich Drepper 3ce1f29594 Cleanup of configuration options 
Make several tool features mandatory and simplify the code.
2011-09-10 14:34:15 -04:00

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dnl Process this file with autoconf to produce a configure script.
AC_REVISION([$CVSid$])
AC_PREREQ(2.53)dnl dnl Minimum Autoconf version required.
AC_INIT([GNU C Library], [(see version.h)], [glibc])
AC_CONFIG_SRCDIR([include/features.h])
AC_CONFIG_HEADERS([config.h])
AC_CONFIG_AUX_DIR([scripts])
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
if test "`cd $srcdir; /bin/pwd`" = "`/bin/pwd`"; then
AC_MSG_ERROR([you must configure in a separate build directory])
fi
# This will get text that should go into config.make.
config_vars=
# Check for a --with-gd argument and set libgd-LDFLAGS in config.make.
AC_ARG_WITH([gd],
AC_HELP_STRING([--with-gd=DIR],
[find libgd include dir and library with prefix DIR]),
[dnl
case "$with_gd" in
yes|''|no) ;;
*) libgd_include="-I$withval/include"
libgd_ldflags="-L$withval/lib" ;;
esac
])
AC_ARG_WITH([gd-include],
AC_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],
AC_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 = $libgd_ldflags"
fi
dnl Arguments to specify presence of other packages/features.
AC_ARG_WITH([fp],
AC_HELP_STRING([--with-fp],
[if using floating-point hardware @<:@default=yes@:>@]),
[with_fp=$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)]),
[path_binutils=$withval],
[path_binutils=''])
AC_ARG_WITH([elf],
AC_HELP_STRING([--with-elf],
[if using the ELF object format]),
[elf=$withval],
[elf=no])
AC_ARG_WITH([selinux],
AC_HELP_STRING([--with-selinux],
[if building with SELinux support]),
[with_selinux=$withval],
[with_selinux=auto])
AC_ARG_WITH([xcoff],
AC_HELP_STRING([--with-xcoff],
[if using the XCOFF object format]),
[xcoff=$withval],
[xcoff=no])
AC_ARG_WITH([headers],
AC_HELP_STRING([--with-headers=PATH],
[location of system headers to use
(for example /usr/src/linux/include)
@<:@default=compiler default@:>@]),
[sysheaders=$withval],
[sysheaders=''])
AC_SUBST(use_default_link)
AC_ARG_WITH([default-link],
AC_HELP_STRING([--with-default-link],
[do not use explicit linker scripts]),
[use_default_link=$withval],
[use_default_link=default])
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@:>@]),
[enable_sanity=$enableval],
[enable_sanity=yes])
AC_SUBST(enable_check_abi)
AC_ARG_ENABLE([check-abi],
AC_HELP_STRING([--enable-check-abi],
[do "make check-abi" in "make check" (no/warn/yes)
@<:@default=no@:>@]),
[enable_check_abi=$enableval],
[enable_check_abi=no])
dnl Arguments to enable or disable building the static, shared, profiled,
dnl and -fomit-frame-pointer libraries.
dnl I've disabled this for now since we cannot build glibc without static
dnl libraries built in the moment.
dnl AC_ARG_ENABLE([static],
dnl AC_HELP_STRING([--enable-static],
dnl [build static library @<:@default=yes@:>@]),
dnl [static=$enableval],
dnl [static=yes])
static=yes
AC_ARG_ENABLE([shared],
AC_HELP_STRING([--enable-shared],
[build shared library @<:@default=yes if GNU ld & ELF@:>@]),
[shared=$enableval],
[shared=default])
AC_ARG_ENABLE([profile],
AC_HELP_STRING([--enable-profile],
[build profiled library @<:@default=no@:>@]),
[profile=$enableval],
[profile=no])
AC_ARG_ENABLE([omitfp],
AC_HELP_STRING([--enable-omitfp],
[build undebuggable optimized library @<:@default=no@:>@]),
[omitfp=$enableval],
[omitfp=no])
AC_ARG_ENABLE([bounded],
AC_HELP_STRING([--enable-bounded],
[build with runtime bounds checking @<:@default=no@:>@]),
[bounded=$enableval],
[bounded=no])
AC_ARG_ENABLE([versioning],
AC_HELP_STRING([--disable-versioning],
[do not include versioning information in the library objects @<:@default=yes if supported@:>@]),
[enable_versioning=$enableval],
[enable_versioning=yes])
AC_ARG_ENABLE([oldest-abi],
AC_HELP_STRING([--enable-oldest-abi=ABI],
[configure the oldest ABI supported @<:@e.g. 2.2@:>@ @<:@default=glibc default@:>@]),
[oldest_abi=$enableval],
[oldest_abi=no])
if test "$oldest_abi" = yes || test "$oldest_abi" = no; then
oldest_abi=default
else
AC_DEFINE_UNQUOTED(GLIBC_OLDEST_ABI, "$oldest_abi")
fi
AC_SUBST(oldest_abi)
AC_ARG_ENABLE([stackguard-randomization],
AC_HELP_STRING([--enable-stackguard-randomization],
[initialize __stack_chk_guard canary with a random number at program start]),
[enable_stackguard_randomize=$enableval],
[enable_stackguard_randomize=no])
if test "$enable_stackguard_randomize" = yes; then
AC_DEFINE(ENABLE_STACKGUARD_RANDOMIZE)
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])
dnl Let the user avoid using TLS. Don't know why but...
AC_ARG_WITH([tls],
AC_HELP_STRING([--with-tls],
[enable support for TLS]),
[usetls=$withval],
[usetls=yes])
AC_ARG_ENABLE([hidden-plt],
AC_HELP_STRING([--disable-hidden-plt],
[do not hide internal function calls to avoid PLT]),
[hidden=$enableval],
[hidden=yes])
if test "x$hidden" = xno; then
AC_DEFINE(NO_HIDDEN)
fi
AC_ARG_ENABLE([bind-now],
AC_HELP_STRING([--enable-bind-now],
[disable lazy relocations in DSOs]),
[bindnow=$enableval],
[bindnow=no])
AC_SUBST(bindnow)
dnl On some platforms we cannot use dynamic loading. We must provide
dnl static NSS modules.
AC_ARG_ENABLE([static-nss],
AC_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"$shared" = xno; then
static_nss=yes
AC_DEFINE(DO_STATIC_NSS)
fi
AC_ARG_ENABLE([force-install],
AC_HELP_STRING([--disable-force-install],
[don't force installation of files from this package, even if they are older than the installed files]),
[force_install=$enableval],
[force_install=yes])
AC_SUBST(force_install)
dnl On some platforms we allow dropping compatibility with all kernel
dnl versions.
AC_ARG_ENABLE([kernel],
AC_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],
AC_HELP_STRING([--enable-all-warnings],
[enable all useful warnings gcc can issue]),
[all_warnings=$enableval],
[])
AC_SUBST(all_warnings)
AC_ARG_ENABLE([multi-arch],
AC_HELP_STRING([--enable-multi-arch],
[enable single DSO with optimizations for multiple architectures]),
[multi_arch=$enableval],
[multi_arch=default])
AC_ARG_ENABLE([nss-crypt],
AC_HELP_STRING([--enable-nss-crypt],
[enable libcrypt to use nss]),
[nss_crypt=$enableval],
[nss_crypt=no])
if test x$nss_crypt = xyes; then
nss_includes=-I$(nss-config --includedir 2>/dev/null)
if test $? -ne 0; then
AC_MSG_ERROR([cannot find include directory with nss-config])
fi
old_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS $nss_includes"
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
#include <hasht.h>
#include <nsslowhash.h>
void f (void) { NSSLOW_Init (); }])],
libc_cv_nss_crypt=yes,
AC_MSG_ERROR([
cannot find NSS headers with lowlevel hash function interfaces]))
old_LIBS="$LIBS"
LIBS="$LIBS -lfreebl3"
AC_LINK_IFELSE([AC_LANG_PROGRAM([typedef int PRBool;
#include <hasht.h>
#include <nsslowhash.h>],
[NSSLOW_Init();])],
libc_cv_nss_crypt=yes,
AC_MSG_ERROR([
cannot link program using lowlevel NSS hash functions]))
CFLAGS="$old_CFLAGS"
LIBS="$old_LIBS"
else
libc_cv_nss_crypt=no
fi
AC_SUBST(libc_cv_nss_crypt)
# The way shlib-versions is used to generate soversions.mk 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 $host_os
# of `gnu*' here to be `gnu-gnu*' just so that shlib-versions can
# tell. This doesn't get used much beyond that, so it's fairly safe.
case "$host_os" in
linux*)
;;
gnu*)
host_os=`echo $host_os | sed -e 's/gnu/gnu-gnu/'`
;;
esac
# We keep the original values in `$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 $config_os | sed 's/^unknown-//'`"
# Some configurations imply other options.
case "$host_os" in
# i586-linuxaout is mangled into i586-pc-linux-gnuaout
linux*ecoff* | linux*aout* | gnu*aout* | gnu*ecoff*)
;;
gnu* | linux* | freebsd* | netbsd* | sysv4* | solaris2* | irix6*)
# These systems (almost) always use the ELF format.
elf=yes
;;
aix*)
# These systems are always xcoff
xcoff=yes
elf=no
;;
esac
# The configure fragment of an add-on 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=$config_os
base_os=''
# config.guess on some IBM machines says `rs6000' instead of `powerpc'.
# Unify this here.
if test "$machine" = rs6000; then
machine="powerpc"
fi
# Braindead PowerPC box with absolutely no FPU.
case "$machine-$host_os" in
powerpc*-*soft)
with_fp=no
;;
esac
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 add-on can set this when it wants to disable the sanity check below.
libc_config_ok=no
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
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
if frags=`ls -d $libc_add_on_srcdir/sysdeps/*/preconfigure 2> /dev/null`
then
AC_MSG_CHECKING(add-on $libc_add_on for preconfigure fragments)
for frag in $frags; do
name=`echo "$frag" | sed 's@/[[^/]]*$@@;s@^.*/@@'`
echo $ECHO_N "$name $ECHO_C" >&AS_MESSAGE_FD
. "$frag"
done
AC_MSG_RESULT()
fi
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 $use_add_ons`"
fi
AC_SUBST(add_ons)
AC_SUBST(add_on_subdirs)
###
### I put this here to prevent those annoying emails from people who cannot
### read and try to compile glibc on unsupported platforms. --drepper
###
### By using the undocumented --enable-hacker-mode option for configure
### one can skip this test to make the configuration not fail for unsupported
### platforms.
###
if test -z "$enable_hacker_mode" && test x"$libc_config_ok" != xyes; then
case "$machine-$host_os" in
*-linux* | *-gnu* | arm*-none* | powerpc-aix4.3.*)
;;
*)
echo "*** The GNU C library is currently not available for this platform."
echo "*** So far nobody cared to port it and if there is no volunteer it"
echo "*** might never happen. So, if you have interest to see glibc on"
echo "*** this platform visit"
echo "*** http://www.gnu.org/software/libc/porting.html"
echo "*** and join the group of porters"
exit 1
;;
esac
fi
dnl We need to use [ and ] for other purposes for a while now.
changequote(,)dnl
# Expand the configuration machine name into a subdirectory by architecture
# type and particular chip. If an add-on configure fragment already set
# base_machine, we don't change it.
test -n "$base_machine" || case "$machine" in
a29k | am29000) base_machine=a29k machine=a29k ;;
c3[012]) base_machine=cx0 machine=cx0/c30 ;;
c4[04]) base_machine=cx0 machine=cx0/c40 ;;
i[34567]86) base_machine=i386 machine=i386/$machine ;;
ia64) base_machine=ia64 machine=ia64 ;;
m88???) base_machine=m88k machine=m88k/$machine ;;
m88k) base_machine=m88k machine=m88k/m88100 ;;
powerpc) base_machine=powerpc machine=powerpc/powerpc32 ;;
powerpc64) base_machine=powerpc machine=powerpc/powerpc64 ;;
s390) base_machine=s390 machine=s390/s390-32 ;;
s390x) base_machine=s390 machine=s390/s390-64 ;;
sh3*) base_machine=sh machine=sh/sh3 ;;
sh4*) base_machine=sh machine=sh/sh4 ;;
sparc | sparcv[67])
base_machine=sparc machine=sparc/sparc32 ;;
sparcv8 | supersparc | hypersparc)
base_machine=sparc machine=sparc/sparc32/sparcv8 ;;
sparcv8plus | sparcv8plusa | sparcv9)
base_machine=sparc machine=sparc/sparc32/sparcv9 ;;
sparcv8plusb | sparcv9b)
base_machine=sparc machine=sparc/sparc32/sparcv9/sparcv9b ;;
sparcv9v)
base_machine=sparc machine=sparc/sparc32/sparcv9/sparcv9v ;;
sparcv9v2)
base_machine=sparc machine=sparc/sparc32/sparcv9/sparcv9v2 ;;
sparc64)
base_machine=sparc machine=sparc/sparc64 ;;
sparc64b)
base_machine=sparc machine=sparc/sparc64/sparcv9b ;;
sparc64v)
base_machine=sparc machine=sparc/sparc64/sparcv9v ;;
sparc64v2)
base_machine=sparc machine=sparc/sparc64/sparcv9v2 ;;
*) base_machine=$machine ;;
esac
changequote([,])dnl
AC_SUBST(base_machine)
if test "$base_machine" = "i386"; then
AC_DEFINE(USE_REGPARMS)
fi
# For the multi-arch option we need support in the assembler.
AC_CACHE_CHECK([for assembler gnu_indirect_function symbol type support],
libc_cv_asm_gnu_indirect_function, [dnl
cat > conftest.s <<EOF
.type foo,%gnu_indirect_function
EOF
if ${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD;
then
libc_cv_asm_gnu_indirect_function=yes
else
libc_cv_asm_gnu_indirect_function=no
fi
rm -f conftest*])
AC_MSG_CHECKING(whether .text pseudo-op must be used)
AC_CACHE_VAL(libc_cv_dot_text, [dnl
cat > conftest.s <<EOF
.text
EOF
libc_cv_dot_text=
if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
libc_cv_dot_text=.text
fi
rm -f conftest*])
if test -z "$libc_cv_dot_text"; then
AC_MSG_RESULT(no)
else
AC_MSG_RESULT(yes)
fi
AC_CACHE_CHECK(for assembler global-symbol directive,
libc_cv_asm_global_directive, [dnl
libc_cv_asm_global_directive=UNKNOWN
for ac_globl in .globl .global .EXPORT; do
cat > conftest.s <<EOF
${libc_cv_dot_text}
${ac_globl} foo
foo:
EOF
if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
libc_cv_asm_global_directive=${ac_globl}
fi
rm -f conftest*
test $libc_cv_asm_global_directive != UNKNOWN && break
done])
if test $libc_cv_asm_global_directive = UNKNOWN; then
AC_MSG_ERROR(cannot determine asm global directive)
else
AC_DEFINE_UNQUOTED(ASM_GLOBAL_DIRECTIVE, ${libc_cv_asm_global_directive})
fi
AC_CACHE_CHECK(for assembler .type directive prefix,
libc_cv_asm_type_prefix, [dnl
libc_cv_asm_type_prefix=no
for ac_try_prefix in '@' '%' '#'; do
cat > conftest.s <<EOF
${libc_cv_dot_text}
${libc_cv_asm_global_directive} foo
.type foo, ${ac_try_prefix}object
.size foo, 1
foo:
.byte 1
EOF
if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
libc_cv_asm_type_prefix=${ac_try_prefix}
fi
rm -f conftest*
test "x$libc_cv_asm_type_prefix" != xno && break
done])
if test "x$libc_cv_asm_type_prefix" != xno; then
AC_DEFINE_UNQUOTED(ASM_TYPE_DIRECTIVE_PREFIX, ${libc_cv_asm_type_prefix})
fi
if test x"$libc_cv_asm_gnu_indirect_function" != xyes -a x"$libc_cv_asm_type_prefix" = xno; then
if test x"$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"$multi_arch" != xno; then
multi_arch_d=/multiarch
fi
# Compute the list of sysdep directories for this configuration.
# This can take a while to compute.
sysdep_dir=$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 ;;
netbsd* | 386bsd* | freebsd* | bsdi*)
base_os=unix/bsd/bsd4.4 ;;
osf* | sunos* | ultrix* | newsos* | dynix* | *bsd*)
base_os=unix/bsd ;;
sysv* | isc* | esix* | sco* | minix* | irix4* | linux*)
base_os=unix/sysv ;;
irix6*)
base_os=unix/sysv/irix6/$os ;;
solaris[2-9]*)
base_os=unix/sysv/sysv4 ;;
hpux*)
base_os=unix/sysv/hpux/$os ;;
aix4.3*)
base_os=unix/sysv/aix/aix4.3 ;;
none)
base_os=standalone ;;
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 $m
# Prepend the machine's FPU directory unless --without-fp.
if test "$with_fp" = yes; then
mach="$mach /$1/fpu"
else
mach="$mach /$1/nofpu"
fi
mach="$mach /$1"
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_add_ons=
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 $multi_arch_d $mach ''; do
for d in $add_ons_pfx ''; do
for a in $add_ons_sfx ''; do
if test -n "$m0$m0sub$b$v$o$m$msub"; then
try_srcdir="${srcdir}/"
case "$d" in
/*) try_srcdir= ;;
esac
try="${d}sysdeps$m0$m0sub$b$v$o$m$msub$a"
test -n "$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
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 $sysnames_add_ons$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 $host_cpu is not supported.)
fi
AC_SUBST(submachine)
# We have now validated the configuration.
# If using ELF, look for an `elf' subdirectory of each machine directory.
# We prepend these rather than inserting them whereever the machine appears
# because things specified by the machine's ELF ABI should override
# OS-specific things, and should always be the same for any OS on the
# machine (otherwise what's the point of an ABI?).
if test "$elf" = yes; then
elf_dirs=
for d in $add_ons_pfx ''; do
for m in $mach; do
if test -d $srcdir/${d}sysdeps$m/elf; then
elf_dirs="$elf_dirs ${d}sysdeps$m/elf"
fi
done
done
sysnames="`echo $elf_dirs | sed -e 's,//,/,g'` $sysnames"
fi
# 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
if test -f $xsrcdir$name/Implies; then
# Collect more names from the `Implies' file (removing comments).
implied_candidate="`sed 's/#.*$//' < $xsrcdir$name/Implies`"
implied=
for x in $implied_candidate; do
found=no
if test -d $xsrcdir$name_base/$x; then
implied="$implied $name_base/$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 implied $x try($d) {$try_srcdir}$try" >&2
if test $try != $xsrcdir$name_base/$x && test -d $try_srcdir$try;
then
implied="$implied $try"
found=yes
case "$sysnames_add_ons" in
*" $d "*) ;;
*|'') sysnames_add_ons="$sysnames_add_ons $d" ;;
esac
fi
done
if test $found = no; then
AC_MSG_WARN($name/Implies specifies nonexistent $x)
fi
done
else
implied=
fi
# Add NAME to the list of names.
names="$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
# 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 $implied $* $parent`"
test -n "$sysnames" && set $sysnames
done
# Add the default directories.
default_sysnames=sysdeps/generic
if test "$elf" = yes; then
default_sysnames="sysdeps/generic/elf $default_sysnames"
fi
sysnames="$names $default_sysnames"
AC_SUBST(sysnames)
# The other names were emitted during the scan.
AC_MSG_RESULT($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 $add_on contributed no useful sysdeps directories)
fi
done
AC_SUBST(sysdeps_add_ons)
### Locate tools.
AC_PROG_INSTALL
if test "$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
AC_SUBST(MIG)dnl Needed by sysdeps/mach/configure.in
# Accept binutils 2.13 or newer.
AC_CHECK_PROG_VER(AS, $AS, --version,
[GNU assembler.* \([0-9]*\.[0-9.]*\)],
[2.1[3-9]*|2.1[0-9][0-9]*|2.[2-9][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[3-9]*|2.1[0-9][0-9]*|2.[2-9][0-9]*|[3-9].*|[1-9][0-9]*], LD=: critic_missing="$critic_missing ld")
# We need the physical current working directory. We cannot use the
# "pwd -P" shell builtin since that's not portable. Instead we try to
# find a pwd binary. Note that assigning to the PWD environment
# variable might have some interesting side effects, so we don't do
# that.
AC_PATH_PROG(PWD_P, pwd, no)
if test "$PWD_P" = no; then
AC_MSG_ERROR(*** A pwd binary could not be found.)
fi
# These programs are version sensitive.
AC_CHECK_TOOL_PREFIX
AC_CHECK_PROG_VER(CC, ${ac_tool_prefix}gcc ${ac_tool_prefix}cc, -v,
[version \([egcygnustpi-]*[0-9.]*\)], [3.4* | 4.[0-9]* ],
critic_missing="$critic_missing gcc")
AC_CHECK_PROG_VER(MAKE, gnumake gmake make, --version,
[GNU Make[^0-9]*\([0-9][0-9.]*\)],
[3.79* | 3.[89]*], 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.*],
MAKEINFO=: aux_missing="$aux_missing makeinfo")
AC_CHECK_PROG_VER(SED, sed, --version,
[GNU sed version \([0-9]*\.[0-9.]*\)],
[3.0[2-9]*|3.[1-9]*|[4-9]*],
SED=: aux_missing="$aux_missing sed")
AC_CHECK_TOOL(READELF, readelf, false)
AC_CHECK_PROGS(AUTOCONF, autoconf, no)
case "x$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.in > /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="$aux_missing autoconf"
fi
test -n "$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:$aux_missing
*** some features will be disabled.
*** Check the INSTALL file for required versions.])
# if using special system headers, find out the compiler's sekrit
# header directory and add that to the list. NOTE: Only does the right
# thing on a system that doesn't need fixincludes. (Not presently a problem.)
if test -n "$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
cxxversion=`$CXX -dumpversion 2>&AS_MESSAGE_LOG_FD` &&
cxxmachine=`$CXX -dumpmachine 2>&AS_MESSAGE_LOG_FD` &&
cxxheaders=`$CXX -print-file-name=../../../../include/c++/`"$cxxversion" &&
CXX_SYSINCLUDES="-isystem $cxxheaders \
-isystem $cxxheaders/$cxxmachine -isystem $cxxheaders/backward"
fi
fi
AC_SUBST(SYSINCLUDES)
AC_SUBST(CXX_SYSINCLUDES)
# ranlib is never necessary on Linux and Hurd systems
RANLIB=:
# 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_CACHE_CHECK(whether GCC supports -static-libgcc, libc_cv_gcc_static_libgcc, [dnl
if $CC -v -static-libgcc 2>&1 | grep -q 'unrecognized option.*static-libgcc'; then
libc_cv_gcc_static_libgcc=
else
libc_cv_gcc_static_libgcc=-static-libgcc
fi])
AC_SUBST(libc_cv_gcc_static_libgcc)
AC_PATH_PROG(BASH_SHELL, bash, no)
if test "$BASH_SHELL" != no &&
$BASH_SHELL -c 'test "$BASH_VERSINFO" \
&& test "$BASH_VERSINFO" -ge 2 >&/dev/null'; then
libc_cv_have_bash2=yes
else
libc_cv_have_bash2=no
fi
AC_SUBST(libc_cv_have_bash2)
dnl We need a ksh compatible shell for tzselect.
if test "$BASH_SHELL" = no; then
AC_PATH_PROG(KSH, ksh, no)
if test "$KSH" = no; then
libc_cv_have_ksh=no
else
libc_cv_have_ksh=yes
fi
else
KSH="$BASH_SHELL"
AC_SUBST(KSH)
libc_cv_have_ksh=yes
fi
AC_SUBST(libc_cv_have_ksh)
AC_PROG_AWK
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_PATH_PROG(BISON, bison, no, $PATH:/usr/local/bin:/usr/bin:/bin)
AC_CACHE_CHECK(for signed size_t type, libc_cv_signed_size_t, [dnl
echo '#include <stddef.h>
FOOBAR __SIZE_TYPE__ FOOBAR' > conftest.c
if eval "$ac_cpp conftest.c 2>/dev/null" \
| grep '^FOOBAR.*unsigned.*FOOBAR$' >/dev/null; then
libc_cv_signed_size_t=no
else
libc_cv_signed_size_t=yes
fi
rm -f conftest*])
if test $libc_cv_signed_size_t = yes; then
dnl Do this by hand instead of AC_DEFINE so can add #undef to avoid warnings.
cat >> confdefs.h <<\EOF
#undef __SIZE_TYPE__
#define __SIZE_TYPE__ unsigned
EOF
fi
AC_CACHE_CHECK(for libc-friendly stddef.h, libc_cv_friendly_stddef, [dnl
AC_TRY_COMPILE(dnl
[#define __need_size_t
#define __need_wchar_t
#include <stddef.h>
#define __need_NULL
#include <stddef.h>], [size_t size; wchar_t wchar;
#ifdef offsetof
#error stddef.h ignored __need_*
#endif
if (&size == NULL || &wchar == NULL) abort ();],
libc_cv_friendly_stddef=yes,
libc_cv_friendly_stddef=no)])
if test $libc_cv_friendly_stddef = yes; then
config_vars="$config_vars
override stddef.h = # The installed <stddef.h> seems to be libc-friendly."
fi
AC_CACHE_CHECK(whether we need to use -P to assemble .S files,
libc_cv_need_minus_P, [dnl
cat > conftest.S <<EOF
#include "confdefs.h"
/* Nothing whatsoever. */
EOF
if AC_TRY_COMMAND(${CC-cc} $CPPFLAGS $ASFLAGS -c conftest.S 1>&AS_MESSAGE_LOG_FD); then
libc_cv_need_minus_P=no
else
libc_cv_need_minus_P=yes
fi
rm -f conftest*])
if test $libc_cv_need_minus_P = yes; then
config_vars="$config_vars
asm-CPPFLAGS = -P # The assembler can't grok cpp's # line directives."
fi
AC_CACHE_CHECK(for .set assembler directive, libc_cv_asm_set_directive, [dnl
cat > conftest.s <<EOF
${libc_cv_dot_text}
foo:
.set glibc_conftest_frobozz,foo
$libc_cv_asm_global_directive 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 \
-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(for assembler gnu_unique_object symbol type,
libc_cv_asm_unique_object, [dnl
cat > conftest.s <<EOF
${libc_cv_dot_text}
_sym:
.type _sym, ${libc_cv_asm_type_prefix}gnu_unique_object
EOF
if ${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
libc_cv_asm_unique_object=yes
else
libc_cv_asm_unique_object=no
fi
rm -f conftest*])
if test $libc_cv_asm_unique_object = yes; then
AC_DEFINE(HAVE_ASM_UNIQUE_OBJECT)
fi
AC_CACHE_CHECK(for .symver assembler directive, libc_cv_asm_symver_directive,
[cat > conftest.s <<EOF
${libc_cv_dot_text}
_sym:
.symver _sym,sym@VERS
EOF
if ${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
libc_cv_asm_symver_directive=yes
else
libc_cv_asm_symver_directive=no
fi
rm -f conftest*])
AC_CACHE_CHECK(for ld --version-script, libc_cv_ld_version_script_option, [dnl
if test $libc_cv_asm_symver_directive = yes; then
cat > conftest.s <<EOF
${libc_cv_dot_text}
_sym:
.symver _sym,sym@VERS
EOF
cat > conftest.map <<EOF
VERS_1 {
global: sym;
};
VERS_2 {
global: sym;
} VERS_1;
EOF
if ${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
if AC_TRY_COMMAND([${CC-cc} $CFLAGS $LDFLAGS -shared
-o conftest.so conftest.o
-nostartfiles -nostdlib
-Wl,--version-script,conftest.map
1>&AS_MESSAGE_LOG_FD]);
then
libc_cv_ld_version_script_option=yes
else
libc_cv_ld_version_script_option=no
fi
else
libc_cv_ld_version_script_option=no
fi
else
libc_cv_ld_version_script_option=no
fi
rm -f conftest*])
if test $shared != no &&
test $libc_cv_asm_symver_directive = yes &&
test $libc_cv_ld_version_script_option = yes &&
test $enable_versioning = yes; then
VERSIONING=yes
AC_DEFINE(DO_VERSIONING)
else
VERSIONING=no
fi
AC_SUBST(VERSIONING)
if test $elf = yes && test $shared != no && test $VERSIONING = no; then
echo "\
*** WARNING: You should not compile GNU libc without versioning. Not using
*** versioning will introduce incompatibilities so that old binaries
*** will not run anymore.
*** For versioning you need recent binutils (binutils-2.8.1.0.23 or newer)."
fi
if test $elf = yes; then
AC_CACHE_CHECK(for .previous assembler directive,
libc_cv_asm_previous_directive, [dnl
cat > conftest.s <<EOF
.section foo_section
.previous
EOF
if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
libc_cv_asm_previous_directive=yes
else
libc_cv_asm_previous_directive=no
fi
rm -f conftest*])
if test $libc_cv_asm_previous_directive = yes; then
AC_DEFINE(HAVE_ASM_PREVIOUS_DIRECTIVE)
else
AC_CACHE_CHECK(for .popsection assembler directive,
libc_cv_asm_popsection_directive, [dnl
cat > conftest.s <<EOF
.pushsection foo_section
.popsection
EOF
if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
libc_cv_asm_popsection_directive=yes
else
libc_cv_asm_popsection_directive=no
fi
rm -f conftest*])
if test $libc_cv_asm_popsection_directive = yes; then
AC_DEFINE(HAVE_ASM_POPSECTION_DIRECTIVE)
fi
fi
AC_CACHE_CHECK(for .protected and .hidden assembler directive,
libc_cv_asm_protected_directive, [dnl
cat > conftest.s <<EOF
.protected foo
foo:
.hidden bar
bar:
EOF
if AC_TRY_COMMAND(${CC-cc} -c $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD); then
libc_cv_asm_protected_directive=yes
else
AC_MSG_ERROR(assembler support for symbol visibility is required)
fi
rm -f conftest*])
if test $libc_cv_asm_protected_directive = yes; then
AC_CACHE_CHECK(whether __attribute__((visibility())) is supported,
libc_cv_visibility_attribute,
[cat > conftest.c <<EOF
int foo __attribute__ ((visibility ("hidden"))) = 1;
int bar __attribute__ ((visibility ("protected"))) = 1;
EOF
libc_cv_visibility_attribute=no
if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
if grep '\.hidden.*foo' conftest.s >/dev/null; then
if grep '\.protected.*bar' conftest.s >/dev/null; then
libc_cv_visibility_attribute=yes
fi
fi
fi
rm -f conftest.{c,s}
])
if test $libc_cv_visibility_attribute != yes; then
AC_MSG_ERROR(compiler support for visibility attribute is required)
fi
fi
if test $libc_cv_visibility_attribute = yes; then
AC_CACHE_CHECK(for broken __attribute__((visibility())),
libc_cv_broken_visibility_attribute,
[cat > conftest.c <<EOF
int foo (int x);
int bar (int x) __asm__ ("foo") __attribute__ ((visibility ("hidden")));
int bar (int x) { return x; }
EOF
libc_cv_broken_visibility_attribute=yes
if AC_TRY_COMMAND(${CC-cc} -Werror -S conftest.c -o conftest.s 1>&AS_MESSAGE_LOG_FD); then
changequote(,)dnl
if grep '\.hidden[ _]foo' conftest.s >/dev/null; then
changequote([,])dnl
libc_cv_broken_visibility_attribute=no
fi
fi
rm -f conftest.c conftest.s
])
if test $libc_cv_broken_visibility_attribute = yes; then
AC_MSG_ERROR(working compiler support for visibility attribute is required)
fi
fi
AC_CACHE_CHECK(for broken __attribute__((alias())),
libc_cv_broken_alias_attribute,
[cat > conftest.c <<EOF
extern int foo (int x) __asm ("xyzzy");
int bar (int x) { return x; }
extern __typeof (bar) foo __attribute ((weak, alias ("bar")));
extern int dfoo;
extern __typeof (dfoo) dfoo __asm ("abccb");
int dfoo = 1;
EOF
libc_cv_broken_alias_attribute=yes
if AC_TRY_COMMAND(${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
if test $libc_cv_visibility_attribute = yes; then
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 $libc_cv_have_sdata_section = yes; then
AC_DEFINE(HAVE_SDATA_SECTION)
fi
fi
AC_CACHE_CHECK(for .preinit_array/.init_array/.fini_array support,
libc_cv_initfini_array, [dnl
cat > conftest.c <<EOF
int _start (void) { return 0; }
int __start (void) { return 0; }
int foo (void) { return 1; }
int (*fp) (void) __attribute__ ((section (".init_array"))) = foo;
EOF
if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -o conftest conftest.c
-static -nostartfiles -nostdlib 1>&AS_MESSAGE_LOG_FD])
then
if $READELF -S conftest | fgrep INIT_ARRAY > /dev/null; then
libc_cv_initfini_array=yes
else
libc_cv_initfini_array=no
fi
else
libc_cv_initfini_array=no
fi
rm -f conftest*])
if test $libc_cv_initfini_array != yes; then
AC_MSG_ERROR([Need linker with .init_array/.fini_array support.])
fi
AC_CACHE_CHECK(whether to use .ctors/.dtors header and trailer,
libc_cv_ctors_header, [dnl
libc_cv_ctors_header=yes
AC_TRY_LINK([], [
__attribute__ ((constructor)) void ctor (void) { puts("ctor"); }
__attribute__ ((destructor)) void dtor (void) { puts("dtor"); }
],
[dnl
AS_IF([$READELF -WS conftest$ac_exeext | $AWK '
{ gsub(/\@<:@ */, "@<:@") }
$2 == ".ctors" || $2 == ".dtors" {
size = strtonum("0x" $6)
align = strtonum("0x" $NF)
seen@<:@$2@:>@ = 1
stub@<:@$2@:>@ = size == align * 2
}
END {
ctors_ok = !seen@<:@".ctors"@:>@ || stub@<:@".ctors"@:>@
dtors_ok = !seen@<:@".dtors"@:>@ || stub@<:@".dtors"@:>@
exit ((ctors_ok && dtors_ok) ? 0 : 1)
}
'], [libc_cv_ctors_header=no])
], [dnl
AC_MSG_ERROR([missing __attribute__ ((constructor)) support??])
])
])
if test $libc_cv_ctors_header = no; then
AC_DEFINE(NO_CTORS_DTORS_SECTIONS)
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 -q " -lunwind "; 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 $libc_cv_cc_with_libunwind = yes; then
AC_DEFINE(HAVE_CC_WITH_LIBUNWIND)
fi
AC_CACHE_CHECK(for -z nodelete option,
libc_cv_z_nodelete, [dnl
cat > conftest.c <<EOF
int _start (void) { return 42; }
EOF
if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
-fPIC -shared -o conftest.so conftest.c
-nostartfiles -nostdlib
-Wl,--enable-new-dtags,-z,nodelete 1>&AS_MESSAGE_LOG_FD])
then
libc_cv_z_nodelete=yes
else
AC_MSG_ERROR(linker with -z nodelete support required)
fi
rm -f conftest*])
AC_CACHE_CHECK(for -z nodlopen option,
libc_cv_z_nodlopen, [dnl
cat > conftest.c <<EOF
int _start (void) { return 42; }
EOF
if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
-fPIC -shared -o conftest.so conftest.c
-nostartfiles -nostdlib
-Wl,--enable-new-dtags,-z,nodlopen 1>&AS_MESSAGE_LOG_FD])
then
libc_cv_z_nodlopen=yes
else
AC_MSG_ERROR(linker with -z nodlopen support required)
fi
rm -f conftest*])
AC_CACHE_CHECK(for -z initfirst option,
libc_cv_z_initfirst, [dnl
cat > conftest.c <<EOF
int _start (void) { return 42; }
EOF
if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
-fPIC -shared -o conftest.so conftest.c
-nostartfiles -nostdlib
-Wl,--enable-new-dtags,-z,initfirst 1>&AS_MESSAGE_LOG_FD])
then
libc_cv_z_initfirst=yes
else
AC_MSG_ERROR(linker with -z initfirst support required)
fi
rm -f conftest*])
# Add-on fragments can set these for other machines.
libc_commonpagesize=${libc_commonpagesize:-no}
libc_relro_required=${libc_relro_required:-no}
case "$base_machine" in
i[[34567]]86 | x86_64 | powerpc* | s390*)
libc_commonpagesize=0x1000
libc_relro_required=yes
;;
sparc*)
libc_commonpagesize=0x2000
libc_relro_required=yes
;;
ia64*)
libc_commonpagesize=0x4000
;;
alpha*)
libc_commonpagesize=0x10000
libc_relro_required=yes
;;
esac
if test $libc_commonpagesize != no; then
AC_CACHE_CHECK(for -z relro option,
libc_cv_z_relro, [dnl
libc_cv_z_relro=no
AC_LANG_CONFTEST([AC_LANG_SOURCE([[
int _start (void) { return 42; }
extern void _exit (int);
/* Since these pointers are const, they should go in rodata.
Since they refer to functions that have to be resolved by
dynamic linking, they should instead go in RELRO data. */
const void *const relro[] = { &_start, &_exit, 0 };
/* GNU ld fails to produce RELRO data when it's very small and there is no
normal writable data following it, or if only uninitialized (.bss) data
follows it, or only very small writable data. */
int data[0x10000] = { 1, };
]])])
cat > conftest.awk <<\EOF
BEGIN {
result = "no"
commonpagesize = strtonum(commonpagesize)
}
{ print "LINE:", $0 > "/dev/stderr" }
$1 == "GNU_RELRO" {
vaddr = strtonum($3)
memsz = strtonum($6)
end = vaddr + memsz
printf "vaddr %#x memsz %#x end %#x commonpagesize %#x\n", \
vaddr, memsz, end, commonpagesize > "/dev/stderr"
result = (end % commonpagesize == 0) ? "yes" : "broken"
}
END { print result }
EOF
AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
-fPIC -shared -o conftest.so conftest.c
-nostartfiles -nostdlib
-Wl,-z,relro 1>&AS_MESSAGE_LOG_FD]) &&
AC_TRY_COMMAND([$READELF -Wl conftest.so > conftest.ph]) &&
AC_TRY_COMMAND([
$AWK -v commonpagesize=$libc_commonpagesize -f conftest.awk
conftest.ph > conftest.cps
]) &&
libc_cv_z_relro=`cat conftest.cps 2>&AS_MESSAGE_LOG_FD`
rm -f conftest*])
if { test "x$libc_relro_required" = xyes &&
test "x$libc_cv_z_relro" != xyes
}
then
AC_MSG_ERROR(linker with -z relro support required)
fi
else
AC_MSG_WARN([missing architecture parameter to check for working -z relro])
fi
AC_CACHE_CHECK(for -Bgroup option,
libc_cv_Bgroup, [dnl
cat > conftest.c <<EOF
int _start (void) { return 42; }
EOF
if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
-fPIC -shared -o conftest.so conftest.c
-Wl,-Bgroup -nostdlib 1>&AS_MESSAGE_LOG_FD])
then
libc_cv_Bgroup=yes
else
libc_cv_Bgroup=no
fi
rm -f conftest*])
AC_SUBST(libc_cv_Bgroup)
AC_CACHE_CHECK(for libgcc_s suffix,
libc_cv_libgcc_s_suffix, [dnl
cat > conftest.c <<EOF
int main (void) { return 0; }
EOF
changequote(,)dnl
libc_cv_libgcc_s_suffix=`${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
-fPIC -shared -shared-libgcc -o conftest.so \
conftest.c -v 2>&1 >/dev/null \
| sed -n 's/^.* -lgcc_s\([^ ]*\) .*$/\1/p'`
changequote([,])dnl
rm -f conftest*])
AC_SUBST(libc_cv_libgcc_s_suffix)
AC_CACHE_CHECK(for --as-needed option,
libc_cv_as_needed, [dnl
cat > conftest.c <<EOF
int main (void) { return 0; }
EOF
if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
-fPIC -shared -o conftest.so conftest.c
-lgcc_s$libc_cv_libgcc_s_suffix -Wl,--as-needed
-nostdlib 1>&AS_MESSAGE_LOG_FD])
then
libc_cv_as_needed=yes
else
libc_cv_as_needed=no
fi
rm -f conftest*])
AC_SUBST(libc_cv_as_needed)
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 $CPPFLAGS
-S -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD]) \
&& grep -q .note.GNU-stack conftest.s \
&& AC_TRY_COMMAND([${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)
AC_CACHE_CHECK(for -z combreloc,
libc_cv_z_combreloc, [dnl
cat > conftest.c <<EOF
extern int bar (int);
extern int mumble;
int foo (void) { return bar (mumble); }
EOF
if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
-fPIC -shared -o conftest.so conftest.c
-nostdlib -nostartfiles
-Wl,-z,combreloc 1>&AS_MESSAGE_LOG_FD])
then
dnl The following test is a bit weak. We must use a tool which can test
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
libc_cv_z_combreloc=yes
else
libc_cv_z_combreloc=no
fi
else
libc_cv_z_combreloc=no
fi
rm -f conftest*])
if test "$libc_cv_z_combreloc" = yes; then
AC_DEFINE(HAVE_Z_COMBRELOC)
fi
AC_SUBST(libc_cv_z_combreloc)
AC_CACHE_CHECK(for -z execstack,
libc_cv_z_execstack, [dnl
cat > conftest.c <<EOF
int _start (void) { return 42; }
EOF
if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
-fPIC -shared -o conftest.so conftest.c
-Wl,-z,execstack -nostdlib
1>&AS_MESSAGE_LOG_FD])
then
libc_cv_z_execstack=yes
else
libc_cv_z_execstack=no
fi
rm -f conftest*])
AC_SUBST(libc_cv_z_execstack)
AC_CACHE_CHECK(for -fpie, libc_cv_fpie, [dnl
cat > conftest.c <<EOF
int foo;
main () { return 0;}
EOF
if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -pie -fpie
-o conftest conftest.c 1>&AS_MESSAGE_LOG_FD])
then
libc_cv_fpie=yes
else
libc_cv_fpie=no
fi
rm -f conftest*])
AC_SUBST(libc_cv_fpie)
AC_CACHE_CHECK(for --hash-style option,
libc_cv_hashstyle, [dnl
cat > conftest.c <<EOF
int _start (void) { return 42; }
EOF
if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
-fPIC -shared -o conftest.so conftest.c
-Wl,--hash-style=both -nostdlib 1>&AS_MESSAGE_LOG_FD])
then
libc_cv_hashstyle=yes
else
libc_cv_hashstyle=no
fi
rm -f conftest*])
AC_SUBST(libc_cv_hashstyle)
# The linker's default -shared behavior is good enough if it
# does these things that our custom linker scripts ensure that
# all allocated NOTE sections come first.
if test "$use_default_link" = default; then
AC_CACHE_CHECK([for sufficient default -shared layout],
libc_cv_use_default_link, [dnl
libc_cv_use_default_link=no
cat > conftest.s <<\EOF
.section .note.a,"a",%note
.balign 4
.long 4,4,9
.string "GNU"
.string "foo"
.section .note.b,"a",%note
.balign 4
.long 4,4,9
.string "GNU"
.string "bar"
EOF
if AC_TRY_COMMAND([dnl
${CC-cc} $ASFLAGS -shared -o conftest.so conftest.s 1>&AS_MESSAGE_LOG_FD]) &&
ac_try=`$READELF -S conftest.so | sed -n \
['${x;p;}
s/^ *\[ *[1-9][0-9]*\] *\([^ ][^ ]*\) *\([^ ][^ ]*\) .*$/\2 \1/
t a
b
: a
H']`
then
libc_seen_a=no libc_seen_b=no
set -- $ac_try
while test $# -ge 2 -a "$1" = NOTE; do
case "$2" in
.note.a) libc_seen_a=yes ;;
.note.b) libc_seen_b=yes ;;
esac
shift 2
done
case "$libc_seen_a$libc_seen_b" in
yesyes)
libc_cv_use_default_link=yes
;;
*)
echo >&AS_MESSAGE_LOG_FD "\
$libc_seen_a$libc_seen_b from:
$ac_try"
;;
esac
fi
rm -f conftest*])
use_default_link=$libc_cv_use_default_link
fi
fi
AC_CACHE_CHECK(linker output format, libc_cv_output_format, [dnl
if libc_cv_output_format=`
${CC-cc} -nostartfiles -nostdlib -Wl,--print-output-format 2>&AS_MESSAGE_LOG_FD`
then
:
else
libc_cv_output_format=
fi
test -n "$libc_cv_output_format" || libc_cv_output_format=unknown])
AC_SUBST(libc_cv_output_format)
AC_CACHE_CHECK(for -fno-toplevel-reorder -fno-section-anchors, libc_cv_fno_toplevel_reorder, [dnl
cat > conftest.c <<EOF
int foo;
EOF
if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -fno-toplevel-reorder -fno-section-anchors
conftest.c 1>&AS_MESSAGE_LOG_FD])
then
libc_cv_fno_toplevel_reorder=yes
else
libc_cv_fno_toplevel_reorder=no
fi
rm -f conftest*])
if test $libc_cv_fno_toplevel_reorder = yes; then
fno_unit_at_a_time="-fno-toplevel-reorder -fno-section-anchors"
else
fno_unit_at_a_time=-fno-unit-at-a-time
fi
AC_SUBST(fno_unit_at_a_time)
AC_CACHE_CHECK(for -fstack-protector, libc_cv_ssp, [dnl
cat > conftest.c <<EOF
int foo;
main () { return 0;}
EOF
if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -Werror -fstack-protector
-o conftest conftest.c 1>&AS_MESSAGE_LOG_FD])
then
libc_cv_ssp=yes
else
libc_cv_ssp=no
fi
rm -f conftest*])
AC_SUBST(libc_cv_ssp)
AC_CACHE_CHECK(for -fgnu89-inline, libc_cv_gnu89_inline, [dnl
cat > conftest.c <<EOF
int foo;
#ifdef __GNUC_GNU_INLINE__
main () { return 0;}
#else
#error
#endif
EOF
if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -std=gnu99 -fgnu89-inline
-o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD])
then
libc_cv_gnu89_inline=yes
else
libc_cv_gnu89_inline=no
fi
rm -f conftest*])
if test $libc_cv_gnu89_inline = yes; then
gnu89_inline=-fgnu89-inline
else
gnu89_inline=
fi
AC_SUBST(gnu89_inline)
if test $elf != yes; then
AC_CACHE_CHECK(for .init and .fini sections, libc_cv_have_initfini,
[AC_TRY_COMPILE(, [asm (".section .init");
asm (".section .fini");
asm ("${libc_cv_dot_text}");],
libc_cv_have_initfini=yes,
libc_cv_have_initfini=no)])
AC_SUBST(libc_cv_have_initfini)dnl
if test $libc_cv_have_initfini = yes; then
AC_DEFINE(HAVE_INITFINI)
fi
fi
if test $elf = yes; then
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 $libc_cv_have_section_quotes = yes; then
AC_DEFINE(HAVE_SECTION_QUOTES)
fi
fi
dnl AC_CHECK_ASM_UNDERSCORE([ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND]])
AC_DEFUN(AC_CHECK_ASM_UNDERSCORE,
[cat > conftest.$ac_ext <<EOF
dnl This sometimes fails to find confdefs.h, for some reason.
dnl [#]line $LINENO "[$]0"
[#]line $LINENO "configure"
#include "confdefs.h"
void underscore_test(void) {
return; }
EOF
if AC_TRY_EVAL(ac_compile); then
if grep _underscore_test conftest* >/dev/null; then
ifelse([$1], , :, [rm -f conftest*
$1])
else
ifelse([$2], , , [rm -f conftest*
$2])
fi
else
echo "configure: failed program was:" >&AS_MESSAGE_LOG_FD
cat conftest.$ac_ext >&AS_MESSAGE_LOG_FD
ifelse([$2], , , [rm -f conftest*
$2])
fi
rm -f conftest*])
if test $elf = yes; then
libc_cv_asm_underscores=no
else
if test $ac_cv_prog_cc_works = yes; then
AC_CACHE_CHECK(for _ prefix on C symbol names, libc_cv_asm_underscores,
[AC_TRY_LINK([asm ("_glibc_foobar:");], [glibc_foobar ();],
libc_cv_asm_underscores=yes,
libc_cv_asm_underscores=no)])
else
AC_CACHE_CHECK(for _ prefix on C symbol names, libc_cv_asm_underscores,
[AC_CHECK_ASM_UNDERSCORE(libc_cv_asm_underscores=yes,
libc_cv_asm_underscores=no)])
fi
fi
if test $libc_cv_asm_underscores = no; then
AC_DEFINE(NO_UNDERSCORES)
fi
if test $elf = yes; then
libc_cv_weak_symbols=yes
fi
AC_CACHE_CHECK(for assembler .weak directive, libc_cv_asm_weak_directive,
[dnl
cat > conftest.s <<EOF
${libc_cv_dot_text}
${libc_cv_asm_global_directive} foo
foo:
.weak foo
.weak bar; bar = foo
EOF
if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
libc_cv_asm_weak_directive=yes
else
libc_cv_asm_weak_directive=no
fi
rm -f conftest*])
if test $libc_cv_asm_weak_directive = no; then
AC_CACHE_CHECK(for assembler .weakext directive,
libc_cv_asm_weakext_directive,
[dnl
cat > conftest.s <<EOF
${libc_cv_dot_text}
${libc_cv_asm_global_directive} foo
foo:
.weakext bar foo
.weakext baz
${libc_cv_asm_global_directive} baz
baz:
EOF
if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
libc_cv_asm_weakext_directive=yes
else
libc_cv_asm_weakext_directive=no
fi
rm -f conftest*])
fi # no .weak
if test $libc_cv_asm_weak_directive = yes; then
AC_DEFINE(HAVE_ASM_WEAK_DIRECTIVE)
elif test $libc_cv_asm_weakext_directive = yes; then
AC_DEFINE(HAVE_ASM_WEAKEXT_DIRECTIVE)
fi
AC_CACHE_CHECK(whether CFI directives are supported, libc_cv_asm_cfi_directives, [dnl
case $machine in
sparc/sparc64*) cfi_offset=2047;;
*) cfi_offset=0;;
esac
cat > conftest.s <<EOF
.text
.type func,%function
func:
.cfi_startproc
.cfi_remember_state
.cfi_rel_offset 1, $cfi_offset
.cfi_endproc
EOF
if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
libc_cv_asm_cfi_directives=yes
else
libc_cv_asm_cfi_directives=no
fi
rm -f conftest*])
if test $libc_cv_asm_cfi_directives = yes; then
AC_DEFINE(HAVE_ASM_CFI_DIRECTIVES)
fi
AC_CACHE_CHECK(for ld --no-whole-archive, libc_cv_ld_no_whole_archive, [dnl
cat > conftest.c <<\EOF
_start () {}
int __eh_pc;
__throw () {}
EOF
dnl No \ in command here because it ends up inside ''.
if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
-nostdlib -nostartfiles -Wl,--no-whole-archive
-o conftest conftest.c 1>&AS_MESSAGE_LOG_FD]); then
libc_cv_ld_no_whole_archive=yes
else
libc_cv_ld_no_whole_archive=no
fi
rm -f conftest*])
if test $libc_cv_ld_no_whole_archive = no; then
AC_MSG_ERROR([support for --no-whole-archive is needed])
fi
AC_CACHE_CHECK(for gcc -fexceptions, libc_cv_gcc_exceptions, [dnl
cat > conftest.c <<\EOF
_start () {}
int __eh_pc;
__throw () {}
EOF
dnl No \ in command here because it ends up inside ''.
if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
-nostdlib -nostartfiles -fexceptions
-o conftest conftest.c 1>&AS_MESSAGE_LOG_FD]); then
libc_cv_gcc_exceptions=yes
else
libc_cv_gcc_exceptions=no
fi
rm -f conftest*])
if test $libc_cv_gcc_exceptions = yes; then
exceptions=-fexceptions
fi
AC_SUBST(exceptions)dnl
if test "$host_cpu" = powerpc ; then
# Check for a bug present in at least versions 2.8.x of GCC
# and versions 1.0.x of EGCS.
AC_CACHE_CHECK(whether clobbering cr0 causes problems,libc_cv_c_asmcr0_bug,[dnl
AC_TRY_COMPILE([int tester(int x) { asm ("" : : : "cc"); return x & 123; }],,
libc_cv_c_asmcr0_bug='no',
libc_cv_c_asmcr0_bug='yes')])
if test "$libc_cv_c_asmcr0_bug" != 'no'; then
AC_DEFINE(BROKEN_PPC_ASM_CR0)
fi
fi
dnl Check whether compiler understands __builtin_expect.
AC_CACHE_CHECK(for __builtin_expect, libc_cv_gcc_builtin_expect,
[cat > conftest.c <<EOF
#line $LINENO "configure"
int foo (int a)
{
a = __builtin_expect (a, 10);
return a == 10 ? 0 : 1;
}
EOF
dnl No \ in command here because it ends up inside ''.
if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS -nostdlib -nostartfiles
-o conftest conftest.c -lgcc >&AS_MESSAGE_LOG_FD]); then
libc_cv_gcc_builtin_expect=yes
else
libc_cv_gcc_builtin_expect=no
fi
rm -f conftest*])
if test "$libc_cv_gcc_builtin_expect" = no; then
AC_MSG_ERROR([support for __builtin_expect needed])
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([${CC-cc} -O3 -S conftest.c -o - | fgrep "memset" > /dev/null]);
then
libc_cv_gcc_builtin_memset=no
else
libc_cv_gcc_builtin_memset=yes
fi
rm -f conftest* ])
if test "$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([${CC-cc} -O3 -S conftest.c -o - | fgrep "my_strstr" > /dev/null]);
then
libc_cv_gcc_builtin_redirection=yes
else
libc_cv_gcc_builtin_redirection=no
fi
rm -f conftest* ])
if test "$libc_cv_gcc_builtin_redirection" = no; then
AC_MSG_ERROR([support for the symbol redirection needed])
fi
dnl Check whether the compiler supports the __thread keyword.
AC_CACHE_CHECK([for __thread], libc_cv_gcc___thread,
[cat > conftest.c <<\EOF
__thread int a = 42;
EOF
if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -c conftest.c >&AS_MESSAGE_LOG_FD]); then
libc_cv_gcc___thread=yes
else
libc_cv_gcc___thread=no
fi
rm -f conftest*])
if test "$libc_cv_gcc___thread" = no; then
AC_MSG_ERROR([support for the __thread keyword is required])
fi
dnl Check whether the compiler supports the tls_model attribute.
AC_CACHE_CHECK([for tls_model attribute], libc_cv_gcc_tls_model_attr, [dnl
cat > conftest.c <<\EOF
extern __thread int a __attribute__((tls_model ("initial-exec")));
EOF
if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -Werror conftest.c >&AS_MESSAGE_LOG_FD]); then
libc_cv_gcc_tls_model_attr=yes
else
libc_cv_gcc_tls_model_attr=no
fi
rm -f conftest*])
if test "$libc_cv_gcc_tls_model_attr" = no; then
AC_MSG_ERROR([support for the tls_model attribute is required])
fi
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=$submachine"; do
if AC_TRY_COMMAND([${CC-cc} $opt -xc /dev/null -S -o /dev/null]); then
libc_cv_cc_submachine="$opt"
break
fi
done])
if test "x$libc_cv_cc_submachine" = xno; then
AC_MSG_ERROR([${CC-cc} does not support $submachine])
fi
fi
AC_SUBST(libc_cv_cc_submachine)
dnl Check whether we have the gd library available.
AC_MSG_CHECKING(for libgd)
if test "$with_gd" != "no"; then
old_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS $libgd_include"
old_LDFLAGS="$LDFLAGS"
LDFLAGS="$LDFLAGS $libgd_ldflags"
old_LIBS="$LIBS"
LIBS="$LIBS -lgd -lpng -lz -lm"
AC_TRY_LINK([#include <gd.h>], [gdImagePng (0, 0)], LIBGD=yes, LIBGD=no)
CFLAGS="$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)
# See if we have the SELinux header with the NSCD permissions in it.
if test x$have_selinux = xyes ; then
AC_MSG_CHECKING([for NSCD Flask permissions in selinux/av_permissions.h])
AC_TRY_COMPILE([#include <selinux/av_permissions.h>],
[#ifdef NSCD__SHMEMHOST
return 0;
#else
#error NSCD__SHMEMHOST not defined
#endif],
have_selinux=yes, have_selinux=no)
AC_MSG_RESULT($have_selinux)
fi
if test x$with_selinux = xyes ; then
if test x$have_selinux = xno ; then
AC_MSG_ERROR([SELinux explicitly required, but sufficiently recent 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$have_libcap" = xyes; then
AC_DEFINE(HAVE_LIBCAP, 1, [SELinux libcap support])
fi
AC_SUBST(have_libcap)
fi
AC_SUBST(have_selinux)
dnl check for the size of 'long double'.
AC_CHECK_SIZEOF(long double, 0)
sizeof_long_double=$ac_cv_sizeof_long_double
AC_SUBST(sizeof_long_double)
### 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_gcc_unwind_find_fde=no
libc_cv_idn=no
# 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)
. $dest/configure
fi
done
if test x$libc_cv_gcc_unwind_find_fde = xyes; then
AC_DEFINE(EXPORT_UNWIND_FIND_FDE)
fi
AC_SUBST(libc_cv_gcc_unwind_find_fde)
# Test for old glibc 2.0.x headers so that they can be removed properly
# Search only in includedir.
AC_MSG_CHECKING(for old glibc 2.0.x headers)
if eval test -f "${includedir}/elfclass.h" -a -f "${includedir}/fcntlbits.h"
then
old_glibc_headers=yes
else
old_glibc_headers=no
fi
AC_MSG_RESULT($old_glibc_headers)
if test ${old_glibc_headers} = yes; then
AC_MSG_WARN(*** During \"make install\" old headers from glibc 2.0.x will)
AC_MSG_WARN(*** be removed.)
fi
AC_SUBST(old_glibc_headers)
AC_SUBST(libc_cv_slibdir)
AC_SUBST(libc_cv_localedir)
AC_SUBST(libc_cv_sysconfdir)
AC_SUBST(libc_cv_rootsbindir)
AC_SUBST(libc_cv_forced_unwind)
dnl sysdeps/CPU/configure.in checks set this via arch-specific asm tests
AC_SUBST(libc_cv_cpp_asm_debuginfo)
AC_SUBST(libc_cv_cc_sse4)
AC_SUBST(libc_cv_cc_avx)
AC_SUBST(libc_cv_cc_novzeroupper)
AC_SUBST(libc_cv_as_i686)
AC_SUBST(use_ldconfig)
AC_SUBST(ldd_rewrite_script)
AC_SUBST(elf) AC_SUBST(xcoff)
if test $elf = yes; then
AC_DEFINE(HAVE_ELF)
fi
if test $xcoff = yes; then
AC_DEFINE(HAVE_XCOFF)
fi
AC_SUBST(static)
AC_SUBST(shared)
if test $shared = default; then
shared=$elf
fi
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.*])
AC_SUBST(libc_cv_pic_default)
AC_SUBST(profile)
AC_SUBST(omitfp)
AC_SUBST(bounded)
AC_SUBST(static_nss)
AC_SUBST(nopic_initfini)
AC_SUBST(DEFINES)
dnl See sysdeps/mach/configure.in for this variable.
AC_SUBST(mach_interface_list)
if test "`(cd $srcdir; pwd)`" = "`pwd`"; then
config_makefile=
else
config_makefile=Makefile
fi
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)
AC_CONFIG_FILES([config.make ${config_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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