[Bug target/66312] [SH] Regression: Bootstrap failure gcc/d/ctfeexpr.dmd.o differs with gcc-4.8/4.9
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66312 John Paul Adrian Glaubitz changed: What|Removed |Added Status|UNCONFIRMED |RESOLVED Resolution|--- |FIXED --- Comment #25 from John Paul Adrian Glaubitz --- (In reply to John Paul Adrian Glaubitz from comment #24) > Will report back by then. This issue no longer occurs with gcc-5_5.3.1-3 from Debian (SVN/gcc-5 branch r231361) and this bug can therefore be marked as RESOLVED/FIXED. Full build log: https://people.debian.org/~glaubitz/gcc-5_5.3.1-3+sh4_sh4-20151216-2227.build
[Bug target/66312] [SH] Regression: Bootstrap failure gcc/d/ctfeexpr.dmd.o differs with gcc-4.8/4.9
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66312 --- Comment #24 from John Paul Adrian Glaubitz --- (In reply to Oleg Endo from comment #23) > Ping? Doing a test build with gcc-5_-5.3.1-1 from unstable now with gdc enabled. Build should finish tomorrow (building on my fast qemu setup). Will report back by then. Adrian
[Bug target/66312] [SH] Regression: Bootstrap failure gcc/d/ctfeexpr.dmd.o differs with gcc-4.8/4.9
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66312 --- Comment #23 from Oleg Endo --- Ping?
[Bug target/66312] [SH] Regression: Bootstrap failure gcc/d/ctfeexpr.dmd.o differs with gcc-4.8/4.9
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66312 --- Comment #22 from Oleg Endo --- Adrian, any updates on this issue?
[Bug target/66312] [SH] Regression: Bootstrap failure gcc/d/ctfeexpr.dmd.o differs with gcc-4.8/4.9
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66312 --- Comment #21 from John Paul Adrian Glaubitz --- (In reply to Oleg Endo from comment #19) > Yes, that's what I meant. Could you try building gdc with gcc 5? Sure. But I will have to wait a little. We are currently missing some buildds that went offline which are all in Japan and I am waiting for Nobuhiro to restore their operation. I don't want to take away buildd resources at the moment for this reason. But I will follow up as soon as possible. Adrian
[Bug target/66312] [SH] Regression: Bootstrap failure gcc/d/ctfeexpr.dmd.o differs with gcc-4.8/4.9
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66312 --- Comment #17 from Oleg Endo --- Adrian, the recent GCC 5 build/bootstrap on SH included D, didn't it?
[Bug target/66312] [SH] Regression: Bootstrap failure gcc/d/ctfeexpr.dmd.o differs with gcc-4.8/4.9
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66312 --- Comment #18 from John Paul Adrian Glaubitz --- (In reply to Oleg Endo from comment #17) > Adrian, the recent GCC 5 build/bootstrap on SH included D, didn't it? If you mean that gdc is built with gcc-5 on sh4, then no. The gdc packages are missing for gcc-5 on sh4 [1]. Adrian > [1] ftp://ftp.debian-ports.org/debian/pool-sh4/main/g/gcc-5/
[Bug target/66312] [SH] Regression: Bootstrap failure gcc/d/ctfeexpr.dmd.o differs with gcc-4.8/4.9
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66312 --- Comment #19 from Oleg Endo --- (In reply to John Paul Adrian Glaubitz from comment #18) > (In reply to Oleg Endo from comment #17) > > Adrian, the recent GCC 5 build/bootstrap on SH included D, didn't it? > > If you mean that gdc is built with gcc-5 on sh4, then no. The gdc packages > are missing for gcc-5 on sh4 [1]. Yes, that's what I meant. Could you try building gdc with gcc 5?
[Bug target/66312] [SH] Regression: Bootstrap failure gcc/d/ctfeexpr.dmd.o differs with gcc-4.8/4.9
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66312 --- Comment #20 from Oleg Endo --- (In reply to John Paul Adrian Glaubitz from comment #12) > Created attachment 36224 [details] > Stage 3 compiled version of ctfeexpr.dmd.o (unstripped) (In reply to John Paul Adrian Glaubitz from comment #11) > Created attachment 36223 [details] > Stage 2 compiled version of ctfeexpr.dmd.o (unstripped) I could spot only one difference: stage2: cmp/pz r1 // T = r1 >= 0 stage3: not r1,r0 shll r0 // T = ~r0 >> 31 Both versions are functionally equivalent. The increase from 1 insn to 2 insns then seems to cause other differences, which are mainly only offsets. Sometimes register allocation could also be affected. The question is why this is happening...
[Bug target/66312] [SH] Regression: Bootstrap failure gcc/d/ctfeexpr.dmd.o differs with gcc-4.8/4.9
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66312 --- Comment #16 from John Paul Adrian Glaubitz glaubitz at physik dot fu-berlin.de --- (In reply to John Paul Adrian Glaubitz from comment #15) Oh, and according to the Debian changelog, it must be a regression that was introduced somewhere between r218987 and r222750 of the gcc-4.9 branch. Also present in r222011. We don't have any version in Debian between r218987 and r222011 which I could test though. Adrian
[Bug target/66312] [SH] Regression: Bootstrap failure gcc/d/ctfeexpr.dmd.o differs with gcc-4.8/4.9
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66312 --- Comment #13 from John Paul Adrian Glaubitz glaubitz at physik dot fu-berlin.de --- Created attachment 36225 -- https://gcc.gnu.org/bugzilla/attachment.cgi?id=36225action=edit Diff of the disassembly of the stripped versions of cfteexpr.dmd.o for stage 2 and 3
[Bug target/66312] [SH] Regression: Bootstrap failure gcc/d/ctfeexpr.dmd.o differs with gcc-4.8/4.9
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66312 --- Comment #11 from John Paul Adrian Glaubitz glaubitz at physik dot fu-berlin.de --- Created attachment 36223 -- https://gcc.gnu.org/bugzilla/attachment.cgi?id=36223action=edit Stage 2 compiled version of ctfeexpr.dmd.o (unstripped)
[Bug target/66312] [SH] Regression: Bootstrap failure gcc/d/ctfeexpr.dmd.o differs with gcc-4.8/4.9
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66312 --- Comment #12 from John Paul Adrian Glaubitz glaubitz at physik dot fu-berlin.de --- Created attachment 36224 -- https://gcc.gnu.org/bugzilla/attachment.cgi?id=36224action=edit Stage 3 compiled version of ctfeexpr.dmd.o (unstripped)
[Bug target/66312] [SH] Regression: Bootstrap failure gcc/d/ctfeexpr.dmd.o differs with gcc-4.8/4.9
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66312 --- Comment #15 from John Paul Adrian Glaubitz glaubitz at physik dot fu-berlin.de --- Oh, and according to the Debian changelog, it must be a regression that was introduced somewhere between r218987 and r222750 of the gcc-4.9 branch. Currently, the buildds did not build any snapshot version between those two revisions unfortunately, but I can just do more test builds to narrow down the revision range where we need to look for the change that introduced the regression. Adrian
[Bug target/66312] [SH] Regression: Bootstrap failure gcc/d/ctfeexpr.dmd.o differs with gcc-4.8/4.9
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66312 --- Comment #14 from John Paul Adrian Glaubitz glaubitz at physik dot fu-berlin.de --- The issue still reproduces with gcc_4.9_4.9.3-3 in Debian which corresponds to SVN revision r226107 of the gcc-4.9 branch: Comparing stages 2 and 3 warning: gcc/cc1plus-checksum.o differs warning: gcc/cc1obj-checksum.o differs warning: gcc/cc1objplus-checksum.o differs warning: gcc/cc1-checksum.o differs Bootstrap comparison failure! gcc/d/ctfeexpr.dmd.o differs Makefile:19827: recipe for target 'compare' failed I have attached the stage 2 and 3 versions of gcc/d/ctfeexpr.dmd.o respectively and also disassembled both after stripping them to be able to generate a diff for the disassembled code. Unlike PR/target 67002, the diff seems rather large this time. Let me know if you need anything else, I have kept the full build of the compiler after it failed the compare target. Adrian
[Bug target/66312] [SH] Regression: Bootstrap failure gcc/d/ctfeexpr.dmd.o differs with gcc-4.8/4.9
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66312 --- Comment #10 from John Paul Adrian Glaubitz glaubitz at physik dot fu-berlin.de --- (In reply to Oleg Endo from comment #9) Yes, maybe. Please attach. Ok, please give me a few days :).
[Bug target/66312] [SH] Regression: Bootstrap failure gcc/d/ctfeexpr.dmd.o differs with gcc-4.8/4.9
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66312 --- Comment #8 from John Paul Adrian Glaubitz glaubitz at physik dot fu-berlin.de --- Would it be helpful to have a diff of the disassembly attached to this bug report as in PR target/67002?
[Bug target/66312] [SH] Regression: Bootstrap failure gcc/d/ctfeexpr.dmd.o differs with gcc-4.8/4.9
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66312 --- Comment #9 from Oleg Endo olegendo at gcc dot gnu.org --- (In reply to John Paul Adrian Glaubitz from comment #8) Would it be helpful to have a diff of the disassembly attached to this bug report as in PR target/67002? Yes, maybe. Please attach.
[Bug target/66312] [SH] Regression: Bootstrap failure gcc/d/ctfeexpr.dmd.o differs with gcc-4.8/4.9
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66312 --- Comment #5 from John Paul Adrian Glaubitz glaubitz at physik dot fu-berlin.de --- Hello! Just as a heads up: This particular problem did not occur with the snapshot as of 2014-12-20 (r218987) and we actually always built gdc in Debian. So it's definitely a regression as a result of the various changes to the SH target since r218987 as we discussed earlier. This problem affects gcc-4.8 and 4.9 and can be avoided by disabling the gdc package. We have currently disabled gdc in gcc-4.9 and 5 which results in gcc-4.9 being built (gcc-5 is still not being built for known reasons). But it _seems_ that this particular bug shows itself now when trying to build gcc-4.9 as the compiler reproducibly segfaults now [1]. I still have to confirm this by trying another buildd, but I have the suspicion that this segfault is directly related to the aforementioned regression. If this is actually a bug, building gcc-4.9 on tirpitz should fail within approximately an hour. I will report back then! Adrian [1] http://buildd.debian-ports.org/status/fetch.php?pkg=gcc-4.9arch=sh4ver=4.9.2-21stamp=1434293660
[Bug target/66312] [SH] Regression: Bootstrap failure gcc/d/ctfeexpr.dmd.o differs with gcc-4.8/4.9
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66312 --- Comment #6 from Oleg Endo olegendo at gcc dot gnu.org --- (In reply to John Paul Adrian Glaubitz from comment #5) Just as a heads up: This particular problem did not occur with the snapshot as of 2014-12-20 (r218987) and we actually always built gdc in Debian. So it's definitely a regression as a result of the various changes to the SH target since r218987 as we discussed earlier. Please try to find out which revision/patch caused the regression as mentioned above. That would be really helpful.
[Bug target/66312] [SH] Regression: Bootstrap failure gcc/d/ctfeexpr.dmd.o differs with gcc-4.8/4.9
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66312 --- Comment #7 from John Paul Adrian Glaubitz glaubitz at physik dot fu-berlin.de --- (In reply to Oleg Endo from comment #6) Please try to find out which revision/patch caused the regression as mentioned above. That would be really helpful. I am currently waiting for the build queue to empty completely (about two more days), then I'll have a look. Oh, and the segfault seems to be hardware-related, it doesn't occur on my own sh4 board. Adrian
[Bug target/66312] [SH] Regression: Bootstrap failure gcc/d/ctfeexpr.dmd.o differs with gcc-4.8/4.9
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66312 --- Comment #3 from Oleg Endo olegendo at gcc dot gnu.org --- (In reply to Richard Biener from comment #2) D is not part of FSF GCC so I am inclined to close as invalid. If there's a bug that shows up with D but doesn't show up with non-D, and the bug can be identified as an SH backend bug and it's not too complex, then we can fix it. Otherwise I guess we'd have to pass the ball to the debian maintainers of their version of GCC (they also apply a bunch of patches, a vanilla GCC doesn't even build out of the box on SH4 debian). Anyway, please leave this PR open for now.
[Bug target/66312] [SH] Regression: Bootstrap failure gcc/d/ctfeexpr.dmd.o differs with gcc-4.8/4.9
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66312 --- Comment #2 from Richard Biener rguenth at gcc dot gnu.org --- D is not part of FSF GCC so I am inclined to close as invalid.
[Bug target/66312] [SH] Regression: Bootstrap failure gcc/d/ctfeexpr.dmd.o differs with gcc-4.8/4.9
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66312 --- Comment #4 from John Paul Adrian Glaubitz glaubitz at physik dot fu-berlin.de --- (In reply to Oleg Endo from comment #1) As Kaz mentioned in PR 65979 #c8, first revert all the SH specific patches. The SVN revisions are r221686, r221305, r221166, r220957, r220917, r219258. Thus you can pull the patches from the GCC SVN and reverse-apply them to your source tree. That'll be something for the weekend then. I'm still a noob when it comes to messing with the gcc source code, so the learning curve will be a bit steep. But I really want to solve this issue :). Adrian
[Bug target/66312] [SH] Regression: Bootstrap failure gcc/d/ctfeexpr.dmd.o differs with gcc-4.8/4.9
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66312 --- Comment #1 from Oleg Endo olegendo at gcc dot gnu.org --- As Kaz mentioned in PR 65979 #c8, first revert all the SH specific patches. The SVN revisions are r221686, r221305, r221166, r220957, r220917, r219258. Thus you can pull the patches from the GCC SVN and reverse-apply them to your source tree. If bootstrap is OK without all the patches, but otherwise the latest 4.8/4.9 source, then obviously the problem must be one of those patches and it can be narrowed down. If it doesn't bootstrap even without all those patches, it means the bugs have been around for a while.
