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authorH.J. Lu <hongjiu.lu@intel.com>2009-12-23 20:22:46 -0800
committerUlrich Drepper <drepper@redhat.com>2009-12-23 20:22:46 -0800
commit6f89d2f30f97211431d965993f570ed680747584 (patch)
treee39266c46f767a466ed6099f13e9fa79456f2563 /configure.in
parent63de5ef70af0eef3bc6af21463eac8e8efa74afb (diff)
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Enable multiarch whenever possible.
Diffstat (limited to 'configure.in')
-rw-r--r--configure.in35
1 files changed, 31 insertions, 4 deletions
diff --git a/configure.in b/configure.in
index 182c683..8e50602 100644
--- a/configure.in
+++ b/configure.in
@@ -272,12 +272,10 @@ AC_ARG_ENABLE([multi-arch],
AC_HELP_STRING([--enable-multi-arch],
[enable single DSO with optimizations for multiple architectures]),
[multi_arch=$enableval],
- [multi_arch=no])
-if test x"$multi_arch" = xyes; then
- AC_DEFINE(USE_MULTIARCH)
+ [multi_arch=default])
+if test x"$multi_arch" != xno; then
multi_arch_d=/multiarch
fi
-AC_SUBST(multi_arch)
AC_ARG_ENABLE([experimental-malloc],
AC_HELP_STRING([--enable-experimental-malloc],
@@ -722,6 +720,35 @@ for b in $base ''; do
done
done
+# If the assembler supports gnu_indirect_function symbol type and the
+# architecture supports multi-arch, we enable multi-arch by default.
+if test "$multi_arch" = default; then
+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 $ASFLAGS conftest.s 1>&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD;
+then
+ libc_cv_asm_gnu_indirect_function=yes
+else
+ libc_cv_asm_gnu_indirect_function=no
+fi
+rm -f conftest*])
+ multi_arch=no
+ if test "$libc_cv_asm_gnu_indirect_function" = yes; then
+ case $sysnames_add_ons$sysnames in
+ *"$multi_arch_d"*)
+ multi_arch=yes
+ ;;
+ esac
+ fi
+fi
+if test x"$multi_arch" = xyes; 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