Hi, On Thu, Aug 20, 2015 at 11:40 AM, Dirk Neukirchen <dirkneukirc...@web.de> wrote: > GCC 4.9 was marked BROKEN with r46089. Recently GCC 5.2 was added (marked as > broken too) > > commit msg: " toolchain: mark gcc 4.9 as broken, it miscompiles some code > especially on ARM" > > Looking through some GCC 5 serious regressions I found: > > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65932 > > I cannot replicate the ARM issue because of missing details and I dont have > ARM hw where it occurs (arch: malta seems fine) > - but there was an open ticket from a dev on github regarding the boot > problem, which might be a symptom of code miscompile > > https://github.com/wongsyrone/openwrt-1/issues/44 > > According to his tests GCC4.9 and GCC5.2 now work with this 2 changes: > > adding -fno-ipa-sra to Kernel/CPU CFLAGS > > https://github.com/wongsyrone/openwrt-1/commit/35308f2435ec75192324d68817e7702e3b257e71 > https://github.com/wongsyrone/openwrt-1/commit/93c0a5173414cfa7684547de3c3a1f3dc4240383
Readin the bug ticket, it seems that https://gcc.gnu.org/bugzilla/attachment.cgi?id=35775&action=diff should fix the issue at the root cause, but with the "disadvantage" of breaking some testcases relying on the (mis-?)behaviour, which sounds like the "blocker" for this change. So I wonder if adding that wouldn't be a better solution. Jonas _______________________________________________ openwrt-devel mailing list openwrt-devel@lists.openwrt.org https://lists.openwrt.org/cgi-bin/mailman/listinfo/openwrt-devel
