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* [Bug gcov-profile/96970] New: -fprofile-arcs compiled binaries are not reproducible
@ 2020-09-08 9:15 rguenth at gcc dot gnu.org
2020-09-08 9:21 ` [Bug gcov-profile/96970] " pinskia at gcc dot gnu.org
2020-09-08 11:28 ` gccbmw at lsmod dot de
0 siblings, 2 replies; 3+ messages in thread
From: rguenth at gcc dot gnu.org @ 2020-09-08 9:15 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96970
Bug ID: 96970
Summary: -fprofile-arcs compiled binaries are not reproducible
Product: gcc
Version: 11.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: gcov-profile
Assignee: unassigned at gcc dot gnu.org
Reporter: rguenth at gcc dot gnu.org
CC: marxin at gcc dot gnu.org
Target Milestone: ---
> cat t.c
int main(){}
> gcc-10 t.c -fprofile-arcs -S
> mv t.s t.sx
> gcc-10 t.c -fprofile-arcs -S
> diff -u t.sx t.s
--- t.sx 2020-09-08 11:13:32.084430676 +0200
+++ t.s 2020-09-08 11:13:33.284444190 +0200
@@ -46,7 +46,7 @@
.long 1110454826
.zero 4
.quad 0
- .long 1828240311
+ .long 1828579168
.zero 4
.quad .LC0
.quad __gcov_merge_add
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug gcov-profile/96970] -fprofile-arcs compiled binaries are not reproducible
2020-09-08 9:15 [Bug gcov-profile/96970] New: -fprofile-arcs compiled binaries are not reproducible rguenth at gcc dot gnu.org
@ 2020-09-08 9:21 ` pinskia at gcc dot gnu.org
2020-09-08 11:28 ` gccbmw at lsmod dot de
1 sibling, 0 replies; 3+ messages in thread
From: pinskia at gcc dot gnu.org @ 2020-09-08 9:21 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96970
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
I thought you have to set the seed if you want a reproductable binary in this
case.
^ permalink raw reply [flat|nested] 3+ messages in thread
* [Bug gcov-profile/96970] -fprofile-arcs compiled binaries are not reproducible
2020-09-08 9:15 [Bug gcov-profile/96970] New: -fprofile-arcs compiled binaries are not reproducible rguenth at gcc dot gnu.org
2020-09-08 9:21 ` [Bug gcov-profile/96970] " pinskia at gcc dot gnu.org
@ 2020-09-08 11:28 ` gccbmw at lsmod dot de
1 sibling, 0 replies; 3+ messages in thread
From: gccbmw at lsmod dot de @ 2020-09-08 11:28 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96970
Bernhard M. Wiedemann <gccbmw at lsmod dot de> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |gccbmw at lsmod dot de
--- Comment #2 from Bernhard M. Wiedemann <gccbmw at lsmod dot de> ---
Indeed, -frandom-seed makes it deterministic:
rm -f test1.s*
for i in 1 2 ; do
gcc-10 -frandom-seed=42 -fprofile-arcs -S test1.c -o test1.s.$i
done
diff -u test1.s.*
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2020-09-08 11:28 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
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2020-09-08 9:15 [Bug gcov-profile/96970] New: -fprofile-arcs compiled binaries are not reproducible rguenth at gcc dot gnu.org
2020-09-08 9:21 ` [Bug gcov-profile/96970] " pinskia at gcc dot gnu.org
2020-09-08 11:28 ` gccbmw at lsmod dot de
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