fi
AC_SUBST(cross_compiling)
AC_PROG_CPP
+AC_CHECK_TOOL(READELF, readelf, false)
+
# We need the C++ compiler only for testing.
AC_PROG_CXX
-AC_CHECK_TOOL(READELF, readelf, false)
+# It's useless to us if it can't link programs (e.g. missing -lstdc++).
+AC_CACHE_CHECK([whether $CXX can link programs], libc_cv_cxx_link_ok, [dnl
+AC_LANG_PUSH([C++])
+# Default, dynamic case.
+AC_LINK_IFELSE([AC_LANG_PROGRAM([], [])],
+ [libc_cv_cxx_link_ok=yes],
+ [libc_cv_cxx_link_ok=no])
+# Static case.
+old_LDFLAGS="$LDFLAGS"
+LDFLAGS="$LDFLAGS -static"
+AC_LINK_IFELSE([AC_LANG_SOURCE([
+#include <iostream>
+
+int
+main()
+{
+ std::cout << "Hello, world!";
+ return 0;
+}
+])],
+ [],
+ [libc_cv_cxx_link_ok=no])
+LDFLAGS="$old_LDFLAGS"
+AC_LANG_POP([C++])])
+AS_IF([test $libc_cv_cxx_link_ok != yes], [CXX=])
-if test "`cd $srcdir; /bin/pwd`" = "`/bin/pwd`"; then
+if test "`cd $srcdir; pwd -P`" = "`pwd -P`"; then
AC_MSG_ERROR([you must configure in a separate build directory])
fi
[build profiled library @<:@default=no@:>@]),
[profile=$enableval],
[profile=no])
-
-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([timezone-tools],
+ AC_HELP_STRING([--disable-timezone-tools],
+ [do not install timezone tools @<:@default=install@:>@]),
+ [enable_timezone_tools=$enableval],
+ [enable_timezone_tools=yes])
+AC_SUBST(enable_timezone_tools)
AC_ARG_ENABLE([hardcoded-path-in-tests],
AC_HELP_STRING([--enable-hardcoded-path-in-tests],
[Enable lock elision for pthread mutexes by default]),
[enable_lock_elision=$enableval],
[enable_lock_elision=no])
+AC_SUBST(enable_lock_elision)
if test "$enable_lock_elision" = yes ; then
AC_DEFINE(ENABLE_LOCK_ELISION)
fi
[bindnow=$enableval],
[bindnow=no])
AC_SUBST(bindnow)
+if test "x$bindnow" = xyes; then
+ AC_DEFINE(BIND_NOW)
+fi
+
+dnl Build glibc with -fstack-protector, -fstack-protector-all, or
+dnl -fstack-protector-strong.
+AC_ARG_ENABLE([stack-protector],
+ AC_HELP_STRING([--enable-stack-protector=@<:@yes|no|all|strong@:>@],
+ [Use -fstack-protector[-all|-strong] to detect glibc buffer overflows]),
+ [enable_stack_protector=$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_SUBST(all_warnings)
+AC_ARG_ENABLE([werror],
+ AC_HELP_STRING([--disable-werror],
+ [do not build with -Werror]),
+ [enable_werror=$enableval],
+ [enable_werror=yes])
+AC_SUBST(enable_werror)
+
AC_ARG_ENABLE([multi-arch],
AC_HELP_STRING([--enable-multi-arch],
[enable single DSO with optimizations for multiple architectures]),
[multi_arch=$enableval],
[multi_arch=default])
+AC_ARG_ENABLE([experimental-malloc],
+ AC_HELP_STRING([--disable-experimental-malloc],
+ [disable experimental malloc features]),
+ [experimental_malloc=$enableval],
+ [experimental_malloc=yes])
+AC_SUBST(experimental_malloc)
+
AC_ARG_ENABLE([nss-crypt],
AC_HELP_STRING([--enable-nss-crypt],
[enable libcrypt to use nss]),
AC_MSG_ERROR([
cannot find NSS headers with lowlevel hash function interfaces]))
old_LIBS="$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@:>@])],
if test "x$systemtap" != xno; then
AC_CACHE_CHECK([for systemtap static probe support], libc_cv_sdt, [dnl
old_CFLAGS="$CFLAGS"
- CFLAGS="-std=gnu99 $CFLAGS"
+ CFLAGS="-std=gnu11 $CFLAGS"
AC_COMPILE_IFELSE([AC_LANG_SOURCE([[#include <sys/sdt.h>
void foo (int i, void *p)
{
AC_DEFINE(HAVE_PT_CHOWN)
fi
-# 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 $host_os
-# of `gnu*' here to be `gnu-gnu*' just so that shlib-versions can
-# tell. This doesn't get used much beyond that, so it's fairly safe.
+AC_ARG_ENABLE([tunables],
+ [AS_HELP_STRING([--enable-tunables],
+ [Enable tunables support. Known values are 'yes', 'no' and 'valstring'])],
+ [have_tunables=$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
+# $host_os of `gnu*' here to be `gnu-gnu*' just so that it can tell.
+# This doesn't get used much beyond that, so it's fairly safe.
case "$host_os" in
linux*)
;;
;;
esac
+AC_ARG_ENABLE([mathvec],
+ [AS_HELP_STRING([--enable-mathvec],
+ [Enable building and installing mathvec @<:@default depends on architecture@:>@])],
+ [build_mathvec=$enableval],
+ [build_mathvec=notset])
+
# We keep the original values in `$config_*' and never modify them, so we
# can write them unchanged into config.make. Everything else uses
# $machine, $vendor, and $os, and changes them whenever convenient.
os=$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-$host_os" in
- powerpc*-*soft)
- with_fp=no
- ;;
-esac
-
submachine=
AC_ARG_WITH([cpu],
AS_HELP_STRING([--with-cpu=CPU], [select code for CPU variant]),
esac
])
+# An preconfigure script can set this when it wants to disable the sanity
+# check below.
+libc_config_ok=no
+
dnl Let sysdeps/*/preconfigure act here, like they can in add-ons.
LIBC_PRECONFIGURE([$srcdir], [for sysdeps])
-# 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 $subdirs, then
dnl our AC_OUTPUT will actually use it.
AC_SUBST(add_on_subdirs)
-###
-### I put this here to prevent those annoying emails from people who cannot
-### read and try to compile glibc on unsupported platforms. --drepper
###
### By using the undocumented --enable-hacker-mode option for configure
### one can skip this test to make the configuration not fail for unsupported
*-linux* | *-gnu*)
;;
*)
- echo "*** The GNU C library is currently not available for this platform."
- echo "*** So far nobody cared to port it and if there is no volunteer it"
- echo "*** might never happen. So, if you have interest to see glibc on"
- echo "*** this platform visit"
- echo "*** http://www.gnu.org/software/libc/porting.html"
- echo "*** and join the group of porters"
- exit 1
+ AC_MSG_ERROR([
+*** The GNU C library is currently unavailable for this platform.
+*** If you are interested in seeing glibc on this platform visit
+*** the "How to submit a new port" in the wiki:
+*** https://sourceware.org/glibc/wiki/#Development
+*** and join the community!])
;;
esac
fi
-dnl We need to use [ and ] for other purposes for a while now.
-changequote(,)dnl
-# Expand the configuration machine name into a subdirectory by architecture
-# type and particular chip. If an add-on configure fragment already set
-# base_machine, we don't change it.
-test -n "$base_machine" || case "$machine" in
-i[4567]86) base_machine=i386 machine=i386/$machine ;;
-powerpc64*) base_machine=powerpc machine=powerpc/powerpc64 ;;
-powerpc*) base_machine=powerpc machine=powerpc/powerpc32 ;;
-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=$machine ;;
-esac
-changequote([,])dnl
+# Set base_machine if not set by a preconfigure fragment.
+test -n "$base_machine" || base_machine=$machine
AC_SUBST(base_machine)
-if test "$base_machine" = "i386"; then
- AC_DEFINE(USE_REGPARMS)
+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.
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.
$READELF -r conftest 1>&AS_MESSAGE_LOG_FD
fi
rm -f conftest*])
-AC_MSG_CHECKING(whether .text pseudo-op must be used)
-AC_CACHE_VAL(libc_cv_dot_text, [dnl
-cat > conftest.s <<EOF
-.text
+# Check if gcc supports attribute ifunc as it is used in libc_ifunc macro.
+AC_CACHE_CHECK([for gcc attribute ifunc support],
+ libc_cv_gcc_indirect_function, [dnl
+cat > conftest.c <<EOF
+extern int func (int);
+int used_func (int a)
+{
+ return a;
+}
+static void *resolver ()
+{
+ return &used_func;
+}
+extern __typeof (func) func __attribute__ ((ifunc ("resolver")));
EOF
-libc_cv_dot_text=
-if AC_TRY_COMMAND(${CC-cc} $ASFLAGS -c conftest.s 1>&AS_MESSAGE_LOG_FD); then
- libc_cv_dot_text=.text
+libc_cv_gcc_indirect_function=no
+if ${CC-cc} -c conftest.c -o conftest.o 1>&AS_MESSAGE_LOG_FD \
+ 2>&AS_MESSAGE_LOG_FD ; then
+ if $READELF -s conftest.o | grep IFUNC >/dev/null 2>&AS_MESSAGE_LOG_FD; then
+ libc_cv_gcc_indirect_function=yes
+ fi
fi
rm -f conftest*])
-if test -z "$libc_cv_dot_text"; then
- AC_MSG_RESULT(no)
-else
- AC_MSG_RESULT(yes)
-fi
if test x"$libc_cv_ld_gnu_indirect_function" != xyes; then
if test x"$multi_arch" = xyes; then
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.
+Please use a gcc which supports it by default or configure gcc with --enable-gnu-indirect-function])
+fi
multi_arch_d=
if test x"$multi_arch" != xno; then
multi_arch_d=/multiarch
LIBC_PROG_BINUTILS
-# Accept binutils 2.20 or newer.
+# Accept binutils 2.22 or newer.
AC_CHECK_PROG_VER(AS, $AS, --version,
[GNU assembler.* \([0-9]*\.[0-9.]*\)],
- [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[0-9][0-9]*|2.[2-9][0-9]*|[3-9].*|[1-9][0-9]*], LD=: critic_missing="$critic_missing ld")
+ [2.1[0-9][0-9]*|2.2[2-9]*|2.[3-9][0-9]*|[3-9].*|[1-9][0-9]*],
+ AS=: critic_missing="$critic_missing as")
+
+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(CC, ${ac_tool_prefix}gcc ${ac_tool_prefix}cc, -v,
- [version \([egcygnustpi-]*[0-9.]*\)], [4.[4-9].* | 4.[1-9][0-9].* | [5-9].* ],
- 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]* | [4-9].* | [1-9][0-9]*], critic_missing="$critic_missing make")
MSGFMT=: aux_missing="$aux_missing msgfmt")
AC_CHECK_PROG_VER(MAKEINFO, makeinfo, --version,
[GNU texinfo.* \([0-9][0-9.]*\)],
- [4.[5-9]*|4.[1-9][0-9]*|[5-9].*],
+ [4.[7-9]*|4.[1-9][0-9]*|[5-9].*],
MAKEINFO=: aux_missing="$aux_missing makeinfo")
AC_CHECK_PROG_VER(SED, sed, --version,
[GNU sed[^0-9]* \([0-9]*\.[0-9.]*\)],
[GNU Awk[^0-9]*\([0-9][0-9.]*\)],
[3.1.[2-9]*|3.[2-9]*|[4-9]*], critic_missing="$critic_missing gawk")
+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__ < 9)
+#error insufficient compiler
+#endif],
+ [libc_cv_compiler_ok=yes],
+ [libc_cv_compiler_ok=no])])
+AS_IF([test $libc_cv_compiler_ok != yes],
+ [critic_missing="$critic_missing compiler"])
+
AC_CHECK_TOOL(NM, nm, false)
if test "x$maintainer" = "xyes"; then
AUTOCONF=no
fi
+# Check for python3 if available, or else python.
+AC_CHECK_PROGS(PYTHON_PROG, python3 python,no)
+case "x$PYTHON_PROG" in
+xno|x|x:) PYTHON_PROG=no ;;
+*) ;;
+esac
+
+if test "x$PYTHON_PROG" = xno; then
+ aux_missing="$aux_missing python"
+else
+ PYTHON="$PYTHON_PROG -B"
+ AC_SUBST(PYTHON)
+fi
+
test -n "$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:$aux_missing
-*** some features will be disabled.
+*** some features or tests will be disabled.
*** Check the INSTALL file for required versions.])
# if using special system headers, find out the compiler's sekrit
AC_SUBST(SYSINCLUDES)
AC_SUBST(CXX_SYSINCLUDES)
+# Obtain some C++ header file paths. This is used to make a local
+# copy of those headers in Makerules.
+if test -n "$CXX"; then
+ find_cxx_header () {
+ echo "#include <$1>" | $CXX -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.
# LD_LIBRARY_PATH contains the current directory if one of the following
*** 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 'unrecognized option.*static-libgcc' >/dev/null; 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)
AC_PATH_PROG(PERL, 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 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_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
-${libc_cv_dot_text}
+.text
foo:
.set glibc_conftest_frobozz,foo
.globl glibc_conftest_frobozz
void _start() { glibc_conftest_frobozz = 1; }
EOF
if ${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS \
- -nostartfiles -nostdlib \
+ -nostartfiles -nostdlib $no_ssp \
-o conftest conftest.s conftest1.c 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD; then
libc_cv_asm_set_directive=yes
else
AC_DEFINE(HAVE_ASM_SET_DIRECTIVE)
fi
-AC_CACHE_CHECK(for assembler gnu_unique_object symbol type,
- libc_cv_asm_unique_object, [dnl
-cat > conftest.s <<EOF
-${libc_cv_dot_text}
-_sym:
-.type _sym, %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 $libc_cv_asm_unique_object = yes; then
- AC_DEFINE(HAVE_ASM_UNIQUE_OBJECT)
-fi
-
-AC_CACHE_CHECK(for .previous assembler directive,
- libc_cv_asm_previous_directive, [dnl
-cat > conftest.s <<EOF
-.section foo_section
-.previous
-EOF
-if AC_TRY_COMMAND(${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 $libc_cv_asm_popsection_directive = yes; then
- AC_DEFINE(HAVE_ASM_POPSECTION_DIRECTIVE)
- fi
-fi
-AC_CACHE_CHECK(for .protected and .hidden assembler directive,
- libc_cv_asm_protected_directive, [dnl
-cat > conftest.s <<EOF
-.protected foo
-foo:
-.hidden bar
-bar:
+AC_CACHE_CHECK(linker support for protected data symbol,
+ libc_cv_protected_data,
+ [cat > conftest.c <<EOF
+ int bar __attribute__ ((visibility ("protected"))) = 1;
EOF
-if AC_TRY_COMMAND(${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 $libc_cv_asm_protected_directive = yes; then
- AC_CACHE_CHECK(whether __attribute__((visibility())) is supported,
- libc_cv_visibility_attribute,
- [cat > conftest.c <<EOF
- int foo __attribute__ ((visibility ("hidden"))) = 1;
- int bar __attribute__ ((visibility ("protected"))) = 1;
+ libc_cv_protected_data=no
+ if AC_TRY_COMMAND(${CC-cc} -nostdlib -nostartfiles $no_ssp -fPIC -shared conftest.c -o conftest.so); then
+ cat > conftest.c <<EOF
+ extern int bar;
+ int main (void) { return bar; }
EOF
- libc_cv_visibility_attribute=no
- if AC_TRY_COMMAND(${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
+ if AC_TRY_COMMAND(${CC-cc} -nostdlib -nostartfiles $no_ssp conftest.c -o conftest conftest.so); then
+ libc_cv_protected_data=yes
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
+ fi
+ rm -f conftest.*
+ ])
+AC_SUBST(libc_cv_protected_data)
-if test $libc_cv_visibility_attribute = yes; then
- AC_CACHE_CHECK(for broken __attribute__((visibility())),
- libc_cv_broken_visibility_attribute,
- [cat > conftest.c <<EOF
- int foo (int x);
- int bar (int x) __asm__ ("foo") __attribute__ ((visibility ("hidden")));
- int bar (int x) { return x; }
+AC_CACHE_CHECK(linker support for INSERT in linker script,
+ libc_cv_insert,
+ [cat > conftest.c <<EOF
+ const int __attribute__ ((section(".bar"))) bar = 0x12345678;
+ int test (void) { return bar; }
EOF
- libc_cv_broken_visibility_attribute=yes
- if AC_TRY_COMMAND(${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 $libc_cv_broken_visibility_attribute = yes; then
- AC_MSG_ERROR(working compiler support for visibility attribute is required)
- fi
-fi
+ cat > conftest.t <<EOF
+ SECTIONS
+ {
+ .bar : { *(.bar) }
+ }
+ INSERT AFTER .rela.dyn;
+EOF
+ libc_cv_insert=no
+ if AC_TRY_COMMAND([${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,
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
-LIBC_TRY_LINK_STATIC([
-int foo (void) { return 1; }
-int (*fp) (void) __attribute__ ((section (".init_array"))) = foo;
-],
- [if $READELF -S conftest | fgrep INIT_ARRAY > /dev/null; then
- libc_cv_initfini_array=yes
- else
- libc_cv_initfini_array=no
- fi],
- [libc_cv_initfini_array=no])
-])
-if test $libc_cv_initfini_array != yes; then
- AC_MSG_ERROR([Need linker with .init_array/.fini_array support.])
+AC_CACHE_CHECK(whether to put _rtld_local into .sdata section,
+ libc_cv_have_sdata_section,
+ [echo "int i;" > conftest.c
+ libc_cv_have_sdata_section=no
+ if ${CC-cc} $LDFLAGS -fPIC -shared -Wl,--verbose conftest.c -o conftest.so 2>&1 \
+ | grep '\.sdata' >/dev/null; then
+ libc_cv_have_sdata_section=yes
+ fi
+ rm -f conftest.c conftest.so
+ ])
+if test $libc_cv_have_sdata_section = yes; then
+ AC_DEFINE(HAVE_SDATA_SECTION)
fi
AC_CACHE_CHECK(whether to use .ctors/.dtors header and trailer,
AC_DEFINE(HAVE_CC_WITH_LIBUNWIND)
fi
-LIBC_LINKER_FEATURE([-z nodelete], [-Wl,--enable-new-dtags,-z,nodelete],
- [libc_cv_z_nodelete=yes],
- [AC_MSG_ERROR(linker with -z nodelete support required)])
-
-LIBC_LINKER_FEATURE([-z nodlopen], [-Wl,--enable-new-dtags,-z,nodlopen],
- [libc_cv_z_nodlopen=yes],
- [AC_MSG_ERROR(linker with -z nodlopen support required)])
-
-LIBC_LINKER_FEATURE([-z initfirst], [-Wl,--enable-new-dtags,-z,initfirst],
- [libc_cv_z_initfirst=yes],
- [AC_MSG_ERROR(linker with -z initfirst support required)])
-
-# Add-on fragments can set these for other machines.
-libc_commonpagesize=${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
- ;;
-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 $LDFLAGS
- -fPIC -shared -o conftest.so conftest.c
- -Wl,-Bgroup -nostdlib 1>&AS_MESSAGE_LOG_FD])
-then
- libc_cv_Bgroup=yes
-else
- libc_cv_Bgroup=no
-fi
-rm -f conftest*])
-AC_SUBST(libc_cv_Bgroup)
-
ASFLAGS_config=
AC_CACHE_CHECK(whether --noexecstack is desirable for .S files,
libc_cv_as_noexecstack, [dnl
int foo (void) { return bar (mumble); }
EOF
if AC_TRY_COMMAND([${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 $READELF -S conftest.so | grep -E '.rela?.dyn' > /dev/null; then
libc_cv_z_combreloc=yes
else
libc_cv_z_combreloc=no
cat > conftest.c <<EOF
int _start (void) { return 42; }
EOF
-if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
+if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS $no_ssp
-fPIC -shared -o conftest.so conftest.c
-Wl,--hash-style=both -nostdlib 1>&AS_MESSAGE_LOG_FD])
then
use_default_link=$libc_cv_use_default_link
fi
+AC_CACHE_CHECK(for GLOB_DAT reloc,
+ libc_cv_has_glob_dat, [dnl
+cat > conftest.c <<EOF
+extern int mumble;
+int foo (void) { return mumble; }
+EOF
+if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
+ -fPIC -shared -o conftest.so conftest.c
+ -nostdlib -nostartfiles $no_ssp
+ 1>&AS_MESSAGE_LOG_FD])
+then
+dnl look for GLOB_DAT relocation.
+ if $READELF -rW conftest.so | grep '_GLOB_DAT' > /dev/null; then
+ libc_cv_has_glob_dat=yes
+ else
+ libc_cv_has_glob_dat=no
+ fi
+else
+ libc_cv_has_glob_dat=no
+fi
+rm -f conftest*])
+AC_SUBST(libc_cv_has_glob_dat)
+
AC_CACHE_CHECK(linker output format, libc_cv_output_format, [dnl
if libc_cv_output_format=`
-${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 $CPPFLAGS -Werror -fstack-protector],
- [libc_cv_ssp=yes],
- [libc_cv_ssp=no])
-])
-AC_SUBST(libc_cv_ssp)
-
-AC_CACHE_CHECK(for -fgnu89-inline, libc_cv_gnu89_inline, [dnl
+AC_CACHE_CHECK([for -mtls-dialect=gnu2], libc_cv_mtls_dialect_gnu2,
+[dnl
cat > conftest.c <<EOF
-int foo;
-#ifdef __GNUC_GNU_INLINE__
-main () { return 0;}
-#else
-#error
-#endif
+__thread int i;
+void foo (void)
+{
+ i = 10;
+}
EOF
-if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -std=gnu99 -fgnu89-inline
- -o conftest.s conftest.c 1>&AS_MESSAGE_LOG_FD])
+if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS -S -fPIC -mtls-dialect=gnu2
+ conftest.c 1>&AS_MESSAGE_LOG_FD])
then
- libc_cv_gnu89_inline=yes
+ libc_cv_mtls_dialect_gnu2=yes
else
- libc_cv_gnu89_inline=no
+ libc_cv_mtls_dialect_gnu2=no
fi
rm -f conftest*])
-if test $libc_cv_gnu89_inline = yes; then
- gnu89_inline=-fgnu89-inline
-else
- gnu89_inline=
-fi
-AC_SUBST(gnu89_inline)
+AC_SUBST(libc_cv_mtls_dialect_gnu2)
+LIBC_CONFIG_VAR([have-mtls-dialect-gnu2], [$libc_cv_mtls_dialect_gnu2])
AC_CACHE_CHECK(whether cc puts quotes around section names,
libc_cv_have_section_quotes,
AC_DEFINE(HAVE_SECTION_QUOTES)
fi
-AC_CACHE_CHECK(for assembler .weak directive, libc_cv_asm_weak_directive,
- [dnl
-cat > conftest.s <<EOF
-${libc_cv_dot_text}
-.globl foo
-foo:
-.weak foo
-.weak bar; bar = foo
-EOF
-if AC_TRY_COMMAND(${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}
-.globl foo
-foo:
-.weakext bar foo
-.weakext baz
-.globl 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 "$libc_cv_c_asmcr0_bug" != 'no'; then
- AC_DEFINE(BROKEN_PPC_ASM_CR0)
-fi
-fi
-
AC_CACHE_CHECK(for __builtin_memset, libc_cv_gcc_builtin_memset, [dnl
cat > conftest.c <<\EOF
void zero (void *x)
}
EOF
dnl
-if AC_TRY_COMMAND([${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([${CC-cc} -O3 -S conftest.c -o - | grep -F "my_strstr" > /dev/null]);
then
libc_cv_gcc_builtin_redirection=yes
else
AC_MSG_ERROR([support for the symbol redirection needed])
fi
-dnl Check whether the compiler supports the __thread keyword.
-AC_CACHE_CHECK([for __thread], libc_cv_gcc___thread,
-[cat > conftest.c <<\EOF
-__thread int a = 42;
-EOF
-if AC_TRY_COMMAND([${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
-
dnl Determine how to disable generation of FMA instructions.
AC_CACHE_CHECK([for compiler option to disable generation of FMA instructions],
libc_cv_cc_nofma, [dnl
# 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])
+ AC_MSG_ERROR([SELinux explicitly required, but SELinux library not found])
fi
fi
fi
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)
-
CPPUNDEFS=
dnl Check for silly hacked compilers predefining _FORTIFY_SOURCE.
dnl Since we are building the implementations of the fortified functions here,
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. However, compilers like that have not
-# been encountered in practice.
-libc_undefs=`echo "$libc_undefs" | egrep '^(foobar|__stack_chk_fail)$'`
-case "$libc_undefs" in
-foobar) libc_cv_predef_stack_protector=no ;;
-'__stack_chk_fail
-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=
-
-AC_CACHE_CHECK([whether the linker provides __ehdr_start],
+# 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).
+AC_CACHE_CHECK([whether the linker provides working __ehdr_start],
libc_cv_ehdr_start, [
old_CFLAGS="$CFLAGS"
old_LDFLAGS="$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([
-extern const char __ehdr_start __attribute__ ((visibility ("hidden")));
-const char *ehdr (void) { return &__ehdr_start; }
+typedef struct {
+ char foo;
+ long val;
+} Ehdr;
+extern const Ehdr __ehdr_start __attribute__ ((visibility ("hidden")));
+long ehdr (void) { return __ehdr_start.val; }
])],
- [libc_cv_ehdr_start=yes], [libc_cv_ehdr_start=no])
+ [if $READELF -r conftest | grep -F __ehdr_start >/dev/null; then
+ libc_cv_ehdr_start=broken
+ else
+ libc_cv_ehdr_start=yes
+ fi], [libc_cv_ehdr_start=no])
CFLAGS="$old_CFLAGS"
LDFLAGS="$old_LDFLAGS"
LIBS="$old_LIBS"
])
-if test $libc_cv_ehdr_start = yes; then
+if test "$libc_cv_ehdr_start" = yes; then
AC_DEFINE([HAVE_EHDR_START])
+elif test "$libc_cv_ehdr_start" = broken; then
+ AC_MSG_WARN([linker is broken -- you should upgrade])
fi
+AC_CACHE_CHECK(for __builtin_trap with no external dependencies,
+ libc_cv_builtin_trap, [dnl
+libc_cv_builtin_trap=no
+AC_TRY_COMPILE([], [__builtin_trap ()], [
+libc_undefs=`$NM -u conftest.o |
+ LC_ALL=C $AWK '$1 == "U" { print $2 | "sort -u"; next } { exit(1) }' \
+ 2>&AS_MESSAGE_LOG_FD` || {
+ AC_MSG_ERROR([confusing output from $NM -u])
+}
+echo >&AS_MESSAGE_LOG_FD "libc_undefs='$libc_undefs'"
+if test -z "$libc_undefs"; then
+ libc_cv_builtin_trap=yes
+fi])])
+if test $libc_cv_builtin_trap = yes; then
+ AC_DEFINE([HAVE_BUILTIN_TRAP])
+fi
+
+dnl C++ feature tests.
+AC_LANG_PUSH([C++])
+
+AC_CACHE_CHECK([whether the C++ compiler supports thread_local],
+ libc_cv_cxx_thread_local, [
+old_CXXFLAGS="$CXXFLAGS"
+CXXFLAGS="$CXXFLAGS -std=gnu++11"
+AC_COMPILE_IFELSE([AC_LANG_SOURCE([
+#include <thread>
+
+// Compiler support.
+struct S
+{
+ S ();
+ ~S ();
+};
+thread_local S s;
+S * get () { return &s; }
+
+// libstdc++ support.
+#ifndef _GLIBCXX_HAVE___CXA_THREAD_ATEXIT_IMPL
+#error __cxa_thread_atexit_impl not supported
+#endif
+])],
+ [libc_cv_cxx_thread_local=yes],
+ [libc_cv_cxx_thread_local=no])
+CXXFLAGS="$old_CXXFLAGS"
+])
+AC_SUBST(libc_cv_cxx_thread_local)
+
+AC_LANG_POP([C++])
+dnl End of C++ feature tests.
+
### End of automated tests.
### Now run sysdeps configure fragments.
fi
done
+if test x"$build_mathvec" = xnotset; then
+ build_mathvec=no
+fi
+LIBC_CONFIG_VAR([build-mathvec], [$build_mathvec])
+
AC_SUBST(libc_extra_cflags)
AC_SUBST(libc_extra_cppflags)
AC_DEFINE(HAVE_IFUNC)
fi
+if test x"$libc_cv_gcc_indirect_function" = xyes; then
+ AC_DEFINE(HAVE_GCC_IFUNC)
+fi
+
# This is far from the AC_ARG_ENABLE that sets it so that a sysdeps
# configure fragment can override the value to prevent this AC_DEFINE.
AC_SUBST(use_nscd)
build_nscd=$use_nscd
fi
-# 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 ${old_glibc_headers} = yes; then
- AC_MSG_WARN(*** During \"make install\" old headers from glibc 2.0.x will)
- AC_MSG_WARN(*** be removed.)
-fi
-AC_SUBST(old_glibc_headers)
-
AC_SUBST(libc_cv_slibdir)
AC_SUBST(libc_cv_rtlddir)
-AC_SUBST(libc_cv_localedir)
+AC_SUBST(libc_cv_complocaledir)
AC_SUBST(libc_cv_sysconfdir)
AC_SUBST(libc_cv_localstatedir)
AC_SUBST(libc_cv_rootsbindir)
-AC_SUBST(libc_cv_forced_unwind)
if test x$use_ldconfig = xyes; then
AC_DEFINE(USE_LDCONFIG)
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
+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
+fi
+rm -f conftest.*])
+AC_SUBST(libc_cv_pie_default)
+
AC_SUBST(profile)
AC_SUBST(static_nss)
projects / thirdparty / glibc.git / blobdiff