http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48832
Summary: -O2 does not imply -fomit-frame-pointer, contrary to
--help=optimizers -v -Q
Product: gcc
Version: 4.6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: driver
AssignedTo: [email protected]
ReportedBy: [email protected]
Host: x86_64-suse-linux
Target: i586-suse-linux
Build: i586-suse-linux
$ gcc -v -O2 -m32 -Q --help=optimizers 2>&1|grep omit-frame
-fomit-frame-pointer [enabled]
$ cat >xx.c
int f() { return 1; }
$ gcc -O2 -m32 -c xx.c ; objdump -d xx.o
...
00000000 <f>:
0: 55 push %ebp
1: b8 01 00 00 00 mov $0x1,%eax
6: 89 e5 mov %esp,%ebp
8: 5d pop %ebp
9: c3 ret
$
seems gcc is lying in --help=optimizers
I cannot see why in the sources though.
