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authorfxcoudert <fxcoudert@138bc75d-0d04-0410-961f-82ee72b054a4>2013-12-13 21:42:02 +0000
committerTom Tromey <tromey@redhat.com>2013-12-16 13:42:54 -0700
commitafc0578da2868f99075be48f4291bf13cf3c9b10 (patch)
treeefd821b42f96dba764b32a9fcc43402bc6753e57 /configure.ac
parentdc76d75756a47325f5233ff684b05d6c0846e86a (diff)
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* configure.ac: Add user-friendly check for native x86_64-linux multilibs. * configure: Regenerate.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@205975 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'configure.ac')
-rw-r--r--configure.ac20
1 files changed, 20 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac
index 30190d6..b24b33d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2879,6 +2879,26 @@ if test x${is_cross_compiler} = xyes ; then
target_configargs="--with-cross-host=${host_noncanonical} ${target_configargs}"
fi
+# Special user-friendly check for native x86_64-linux build, if
+# multilib is not explicitly enabled.
+case "$target:$have_compiler:$host:$target:$enable_multilib" in
+ x86_64-*linux*:yes:$build:$build:)
+ # Make sure we have a developement environment that handles 32-bit
+ dev64=no
+ echo "int main () { return 0; }" > conftest.c
+ ${CC} -m32 -o conftest ${CFLAGS} ${CPPFLAGS} ${LDFLAGS} conftest.c
+ if test $? = 0 ; then
+ if test -s conftest || test -s conftest.exe ; then
+ dev64=yes
+ fi
+ fi
+ rm -f conftest*
+ if test x${dev64} != xyes ; then
+ AC_MSG_ERROR([I suspect your system does not have 32-bit developement libraries (libc and headers). If you have them, rerun configure with --enable-multilib. If you do not have them, and want to build a 64-bit-only compiler, rerun configure with --disable-multilib.])
+ fi
+ ;;
+esac
+
# Default to --enable-multilib.
if test x${enable_multilib} = x ; then
target_configargs="--enable-multilib ${target_configargs}"