http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53708
Peter Bergner <bergner at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|RESOLVED |REOPENED
CC| |bergner at gcc dot gnu.org
Resolution|FIXED |
--- Comment #9 from Peter Bergner <bergner at gcc dot gnu.org> 2012-10-30
15:47:57 UTC ---
Richard, I'm seeing this same bug in GCC 4.7 on powerpc64-linux when compiling
GLIBC. Is there a chance we can get your patch backported to 4.7? I
bootstrapped and regtested the backport with no regressions and can confirm it
fixes the bug I'm running into, which can be seen with the reduced test case
from glibc:
bergner@bns:~/gcc/BUGS> cat foo.i
static void (*const init_array []) (void)
__attribute__ ((section (".init_array"), aligned (sizeof (void *)), used))
= { 0 };
bergner@bns:~/gcc/BUGS> /home/bergner/gcc/build/gcc-fsf-4_7-base/gcc/xgcc
-B/home/bergner/gcc/build/gcc-fsf-4_7-base/gcc -S -m64 -O3 -maltivec foo.i -o
bad.s
bergner@bns:~/gcc/BUGS> /home/bergner/gcc/build/gcc-fsf-4_7-pr53708/gcc/xgcc
-B/home/bergner/gcc/build/gcc-fsf-4_7-pr53708/gcc -S -m64 -O3 -maltivec foo.i
-o good.s
bergner@bns:~/gcc/BUGS> diff -u bad.s good.s
--- bad.s 2012-10-30 10:41:15.000000000 -0500
+++ good.s 2012-10-30 10:41:23.000000000 -0500
@@ -2,7 +2,7 @@
.section ".toc","aw"
.section ".text"
.section .init_array,"a"
- .align 4
+ .align 3
.type init_array, @object
.size init_array, 8
init_array:
The above is bad, because the extra alignment causes the linker to add some
null padding to the init_array and the loader isn't expecting that and ends up
segv'ing.
