stack-protector configure test and MIPS64

[Joseph S. Myers]

The check for implicit -fstack-protector breaks on MIPS64 with an error:

configure: error: unexpected symbols in test: __gnu_local_gp
foobar

(__gnu_local_gp is a symbol handled specially by the linker on MIPS.)

The patch below allows the build to continue.  But maybe we should just 
allow arbitrary extra undefined symbols rather than whitelisting 
architecture-specific symbols either here or in preconfigure fragments?

2012-05-19  Joseph Myers  <joseph@codesourcery.com>

	* configure.in (libc_cv_predef_stack_protector): Remove
	__gnu_local_gp from libc_undefs.
	* configure: Regenerated.

diff --git a/configure.in b/configure.in
index a9ee733..51fc9c0 100644
--- a/configure.in
+++ b/configure.in
@@ -2071,6 +2071,7 @@ libc_undefs=`$NM -u conftest.o |
     2>&AS_MESSAGE_LOG_FD` || {
   AC_MSG_ERROR([confusing output from $NM -u])
 }
+libc_undefs=`echo "$libc_undefs" | grep -v '^__gnu_local_gp$'`
 echo >&AS_MESSAGE_LOG_FD "libc_undefs='$libc_undefs'"
 case "$libc_undefs" in
 foobar) libc_cv_predef_stack_protector=no ;;

-- 
Joseph S. Myers
joseph@codesourcery.com