[Bug target/45623] GCC 4.5.[01] breaks our ffi on Linux64. ABI break?
--- Comment #9 from mh+gcc at glandium dot org 2010-09-15 11:45 --- Created an attachment (id=21798) -- (http://gcc.gnu.org/bugzilla/attachment.cgi?id=21798action=view) Reduced testcase Both issues Taras mentioned are actually separated. One is an actual bug in ffi (to be filed), the other one is an optimization issue with gcc. I reduced the problematic code to the attached code, which prints foo with -O1 (and more), and bar with -O0, with gcc 4.5.1. gcc 4.4 compiled code correctly prints bar with any optimization level. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45623
[Bug target/45623] GCC 4.5.[01] breaks our ffi on Linux64. ABI break?
--- Comment #10 from mh+gcc at glandium dot org 2010-09-15 11:53 --- Please note this actually only happens on x86. (I would change the summary and target if I could) -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45623
[Bug target/45623] GCC 4.5.[01] breaks our ffi on Linux64. ABI break?
--- Comment #11 from mh+gcc at glandium dot org 2010-09-15 12:05 --- Created an attachment (id=21799) -- (http://gcc.gnu.org/bugzilla/attachment.cgi?id=21799action=view) Reduced testcase Inlining JSVAL_TO_PRIVATE by hand still makes it break, and reduces the testcase further. -- mh+gcc at glandium dot org changed: What|Removed |Added Attachment #21798|0 |1 is obsolete|| http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45623
[Bug target/45623] GCC 4.5.[01] breaks our ffi on Linux64. ABI break?
--- Comment #12 from mh+gcc at glandium dot org 2010-09-15 12:11 --- FWIW, it's still broken on a gcc trunk snapshot from the 28th of august. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45623
[Bug target/45623] GCC 4.5.[01] breaks our ffi on Linux64. ABI break?
--- Comment #13 from rguenth at gcc dot gnu dot org 2010-09-15 12:16 --- Confirmed and investigating. -- rguenth at gcc dot gnu dot org changed: What|Removed |Added Status|WAITING |NEW Ever Confirmed|0 |1 Last reconfirmed|-00-00 00:00:00 |2010-09-15 12:16:05 date|| http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45623
[Bug target/45623] GCC 4.5.[01] breaks our ffi on Linux64. ABI break?
--- Comment #1 from dwitte at mozilla dot com 2010-09-09 22:03 --- FWIW our libffi is basically libffi git head: http://github.com/atgreen/libffi Which is regularly synced to gcc libffi. -- dwitte at mozilla dot com changed: What|Removed |Added CC||dwitte at mozilla dot com http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45623
[Bug target/45623] GCC 4.5.[01] breaks our ffi on Linux64. ABI break?
--- Comment #2 from pinskia at gcc dot gnu dot org 2010-09-09 22:17 --- There have been no ABI changes in 4.5 that I know of for PowerPC64 or even differences between the trunk and 4.5. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45623
[Bug target/45623] GCC 4.5.[01] breaks our ffi on Linux64. ABI break?
--- Comment #3 from hjl dot tools at gmail dot com 2010-09-10 00:38 --- Mozilla bugs say Platform: x86 Linux. But gcc bug says powerpc64-*-linux. What is going on? -- hjl dot tools at gmail dot com changed: What|Removed |Added CC||hjl dot tools at gmail dot ||com Status|UNCONFIRMED |WAITING http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45623
[Bug target/45623] GCC 4.5.[01] breaks our ffi on Linux64. ABI break?
--- Comment #4 from dwitte at mozilla dot com 2010-09-10 00:46 --- This is on x86_64. (I can't change the field, though. Can someone else?) -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45623
[Bug target/45623] GCC 4.5.[01] breaks our ffi on Linux64. ABI break?
--- Comment #5 from hjl dot tools at gmail dot com 2010-09-10 00:51 --- I am not ware any x86-64 psABI changes in gcc 4.5. Please provide a testcase. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45623
[Bug target/45623] GCC 4.5.[01] breaks our ffi on Linux64. ABI break?
--- Comment #6 from pinskia at gcc dot gnu dot org 2010-09-10 01:40 --- (In reply to comment #3) Mozilla bugs say Platform: x86 Linux. But gcc bug says powerpc64-*-linux. What is going on? I must have missed since I saw Linux64 I was thinking powerpc64 :). Really there have been none x86_64 ones either. Though the normal thing here that might happen is strict aliasing issues. Can you try -fno-strict-aliasing. Also maybe look for buffer overflows which might cause issues you think are compiler related. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45623
[Bug target/45623] GCC 4.5.[01] breaks our ffi on Linux64. ABI break?
--- Comment #7 from tglek at mozilla dot com 2010-09-10 02:37 --- -fno-strict-aliasing makes no difference. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45623
[Bug target/45623] GCC 4.5.[01] breaks our ffi on Linux64. ABI break?
--- Comment #8 from hjl dot tools at gmail dot com 2010-09-10 02:56 --- (In reply to comment #0) See https://bugzilla.mozilla.org/show_bug.cgi?id=594611 and https://bugzilla.mozilla.org/show_bug.cgi?id=590683 for more details. This breaks users of Firefox Sync on GCC 4.5. The bug isn't present in gcc 4.4 or trunk. What would it take to cherry-pick a fix for 4.5.x? You either identify which checkin fixes it or find a testcase so that I can use it to find the fix. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45623
