[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
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
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 "$base_machine" = "i386"; then
- AC_DEFINE(USE_REGPARMS)
-fi
-
# For the multi-arch option we need support in the assembler & linker.
AC_CACHE_CHECK([for assembler and linker STT_GNU_IFUNC support],
libc_cv_ld_gnu_indirect_function, [dnl
AC_SUBST(libc_cv_gcc_static_libgcc)
AC_PATH_PROG(BASH_SHELL, bash, no)
-if test "$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_PATH_PROG(PERL, perl, no)
if test "$PERL" != no &&
[libc_cv_z_initfirst=yes],
[AC_MSG_ERROR(linker with -z initfirst support required)])
-# Add-on fragments can set these for other machines.
-libc_commonpagesize=${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
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 $libc_cv_asm_cfi_directives = yes; then
- AC_DEFINE(HAVE_ASM_CFI_DIRECTIVES)
-fi
-
AC_CACHE_CHECK(for ld --no-whole-archive, libc_cv_ld_no_whole_archive, [dnl
cat > conftest.c <<\EOF
_start () {}
fi
AC_SUBST(exceptions)dnl
-if test "$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 "$libc_cv_c_asmcr0_bug" != 'no'; then
- AC_DEFINE(BROKEN_PPC_ASM_CR0)
-fi
-fi
-
AC_CACHE_CHECK(for __builtin_memset, libc_cv_gcc_builtin_memset, [dnl
cat > conftest.c <<\EOF
void zero (void *x)
# See if we have the SELinux library
AC_CHECK_LIB(selinux, is_selinux_enabled,
have_selinux=yes, have_selinux=no)
- # See if we have the SELinux header with the NSCD permissions in it.
- if test x$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
])
libc_extra_cflags=
if test $libc_cv_predef_stack_protector = yes; then
- libc_extra_cflags=-fno-stack-protector
+ libc_extra_cflags="$libc_extra_cflags -fno-stack-protector"
+fi
+libc_extra_cppflags=
+
+AC_CACHE_CHECK([whether the linker provides __ehdr_start],
+ libc_cv_ehdr_start, [
+old_CFLAGS="$CFLAGS"
+old_LDFLAGS="$LDFLAGS"
+old_LIBS="$LIBS"
+CFLAGS="$CFLAGS -fPIC"
+LDFLAGS="$LDFLAGS -nostdlib -nostartfiles -shared"
+LIBS=
+AC_LINK_IFELSE([AC_LANG_SOURCE([
+extern const char __ehdr_start __attribute__ ((visibility ("hidden")));
+const char *ehdr (void) { return &__ehdr_start; }
+])],
+ [libc_cv_ehdr_start=yes], [libc_cv_ehdr_start=no])
+CFLAGS="$old_CFLAGS"
+LDFLAGS="$old_LDFLAGS"
+LIBS="$old_LIBS"
+])
+if test $libc_cv_ehdr_start = yes; then
+ AC_DEFINE([HAVE_EHDR_START])
fi
-AC_SUBST(libc_extra_cflags)
### End of automated tests.
### Now run sysdeps configure fragments.
fi
done
+AC_SUBST(libc_extra_cflags)
+AC_SUBST(libc_extra_cppflags)
+
if test x$libc_cv_gcc_unwind_find_fde = xyes; then
AC_DEFINE(EXPORT_UNWIND_FIND_FDE)
fi
projects / platform / upstream / linaro-glibc.git / blobdiff