glibc-2.7 test for ssp support and use ssp if no error is reported
configure:6449: gcc -B/tools_alpha/bin/ -g -O2 -fstack-protector
-o conftest conftest.c 1>&5
conftest.c:1: warning: -fstack-protector not supported for this target
configure:6452: $? = 0
configure:6461: result: yes
If warning is changed to error, glibc configure now work
I look in gcc-4.2.3 and gcc-4.3 code at gcc/toplev.c
/* Targets must be able to place spill slots at lower addresses. If the
target already uses a soft frame pointer, the transition is trivial. */
if (!FRAME_GROWS_DOWNWARD && flag_stack_protect)
{
warning (0, "-fstack-protector not supported for this target");
flag_stack_protect = 0;
}
if (!flag_stack_protect)
warn_stack_protect = 0;
So with only a warning emittted by gcc, configure receive 0 and report that ssp
work.
I try changing the warning to an error on gcc-4.2.3 and now glib-2.7 configure
on alpha rightfully find
checking for -fstack-protector... no
--- gcc-4.2.3/gcc/toplev.c.old 2007-09-01 17:28:30.000000000 +0200
+++ gcc-4.2.3/gcc/toplev.c 2008-04-06 17:08:14.000000000 +0200
@@ -1834,7 +1834,7 @@
target already uses a soft frame pointer, the transition is trivial. */
if (!FRAME_GROWS_DOWNWARD && flag_stack_protect)
{
- warning (0, "-fstack-protector not supported for this target");
+ error ("-fstack-protector not supported for this target");
flag_stack_protect = 0;
}
if (!flag_stack_protect)
--
Summary: gcc should report an error and not a warning if fstack-
protector is not supported
Product: gcc
Version: 4.2.3
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: g dot esp at free dot fr
GCC host triplet: alpha-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35851
