Re: [PATCH] build system: gcc_cv_libc_provides_ssp

[Thomas Schwinge]

Hello!

On Fri, Oct 10, 2008 at 10:56:34AM +0200, I wrote:
> On Wed, Oct 08, 2008 at 11:53:57AM +0200, I wrote:
> > First, the check for gcc_cv_libc_provides_ssp is not complete, as has
> > already pointed out (with patches!) before, but is still not fixed on
> > trunk.  Let me revisit that: in configure.ac it is being checked for
> > ``case "$target" in *-*-linux*)'' which should rather match ``*-*-linux*
> > | *-*-*-gnu* | *-*-gnu*'' to catch all GNU/Linux, GNU/Hurd, GNU/k*BSD
> > systems.  (This is being patched in the Debian GCC package for some time
> > already.)
> 
> Even though the NATIVE_SYSTEM_HEADER_DIR issue is still being discussed,
> in either way we'll need this patch installed.  Any objections?
> 
> 2008-10-10  Thomas Schwinge  <tschwinge@gnu.org>
> 
>       * configure.ac (gcc_cv_libc_provides_ssp): Also consider GNU/kFreeBSD,
>       GNU/kNetBSD and GNU/Hurd systems.

Here is a better variant.  Paolo (you had already acked the previous
version), but is this OK to install into trunk (see the additional
Hurd-only change)?

Index: configure.ac
===================================================================
--- configure.ac        (Revision 141837)
+++ configure.ac        (Arbeitskopie)
@@ -3474,7 +3474,7 @@
       gcc_cv_libc_provides_ssp,
       [gcc_cv_libc_provides_ssp=no
     case "$target" in
-       *-*-linux*)
+       *-*-linux* | *-*-kfreebsd*-gnu | *-*-knetbsd*-gnu)
       if test x$host != x$target || test "x$TARGET_SYSTEM_ROOT" != x; then
        if test "x$with_sysroot" = x; then
          glibc_header_dir="${exec_prefix}/${target_noncanonical}/sys-include"
@@ -3510,6 +3510,12 @@
        fi
       fi
        ;;
+       *-*-gnu*)
+        # Avoid complicated tests (see
+        # <http://gcc.gnu.org/ml/gcc/2008-10/msg00130.html>) and for now
+        # simply assert that glibc does provide this, which is true for all
+        # realistically usable configurations.
+        gcc_cv_libc_provides_ssp=yes;;
        *-*-darwin*)
         AC_CHECK_FUNC(__stack_chk_fail,[gcc_cv_libc_provides_ssp=yes],
            [echo "no __stack_chk_fail on this target"])


Regards,
 Thomas

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