179554 2007-05-23 17:53 0000 [bad-code/4.2] sigc++-2.0 based code with -fstrict-aliasing crashes with compiled gcc 4.2 2007-07-18 09:42:32 0000 1 1 1 Unclassified Gentoo Linux Core system unspecified All Linux RESOLVED FIXED http://gcc.gnu.org/PR30252 P2 normal --- 162167 1 loki_val@gentoo.org toolchain@gentoo.org dirtyepic@gentoo.org esigra@gmail.com zomps@mail.astar.ee loki_val@gentoo.org 2007-05-23 17:53:39 0000 This has been reported upstream, see URL in bug description. This may be the same bug that's mentioned here: [4.2 regression] miscompilation of sigc++-2.0 based code with -fstrict-aliasing http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30252 Having recompiled my system with the new gcc-4.2.0 and glibc-2.6, I tried to run rtorrent. It segfaults: pa@loki ~/session $ rtorrent Caught Segmentation fault, dumping stack: 0 rtorrent [0x8058ff1] 1 rtorrent [0x806d6d9] 2 [0xffffe420] 3 [0x82e938e] 4 rtorrent [0x805877d] 5 /lib/libc.so.6(__libc_start_main+0xe0) [0xb7a159d0] 6 rtorrent(_ZN7torrent18set_max_open_filesEj+0x89) [0x8051b01] Aborted I have, for now, recompiled just rtorrent and libtorrent with gcc-4.1.2, which works fine. Reproducible: Always Steps to Reproduce: drizzt@gentoo.org 2007-05-23 18:48:52 0000 Can you try to use -fno-strict-aliasing in CFLAGS and see if it works? loki_val@gentoo.org 2007-05-23 20:45:37 0000 I just recompiled libtorrent and rtorrent with these parameters: CFLAGS="-Os -march=athlon-xp -pipe -ggdb3 -fno-strict-aliasing" CXXFLAGS="-Os -march=athlon-xp -pipe -ggdb3 -fno-strict-aliasing" emerge -1 libtorrent rtorrent So far, it seems to work fine. vapier@gentoo.org 2007-06-18 04:26:28 0000 *** Bug 181124 has been marked as a duplicate of this bug. *** vapier@gentoo.org 2007-06-18 04:29:12 0000 rtorrent report: http://libtorrent.rakshasa.no/ticket/926 but in reality, a gcc-4.2 bug dirtyepic@gentoo.org 2007-06-20 00:10:37 0000 Created an attachment (id=122558) 41_all_gcc42-PR30252.patch here's the patch. this should apply after 40_all_gcc42-PR30052.patch. loki_val@gentoo.org 2007-06-21 16:44:37 0000 (In reply to comment #5) > Created an attachment (id=122558) [edit] > 41_all_gcc42-PR30252.patch > > here's the patch. this should apply after 40_all_gcc42-PR30052.patch. > I've just applied this to my local gcc-4.2.0 and gcc builds and rtorrent runs. (I changed the libtorrent and rtorrent ebuilds to not append-flags fno-strict-aliasing). zomps@mail.astar.ee 2007-06-21 18:40:09 0000 Built just new gcc with 1.2 patchet and this patch but still inkscape crashes vapier@gentoo.org 2007-06-22 01:59:23 0000 the fix from upstream has been put into the 1.3 patchset zomps@mail.astar.ee 2007-06-23 11:33:10 0000 Inkscape is still no good with 1.3 patchet vapier@gentoo.org 2007-06-23 14:33:08 0000 what exactly did you re-compile ? rebuilding just inkscape i dont think would be enough zomps@mail.astar.ee 2007-06-23 16:55:10 0000 Rebuild gcc-4.2.0 and after that inkscape vapier@gentoo.org 2007-06-23 17:03:41 0000 which isnt sufficient i dont think ... rebuild all the packages related to inkscape, first starting with dev-libs/libsigc++ 122558 2007-06-20 00:10 0000 41_all_gcc42-PR30252.patch 41_all_gcc42-PR30252.patch text/plain aHR0cHM6Ly9idWdzLmdlbnRvby5vcmcvc2hvd19idWcuY2dpP2lkPTE3OTU1NApodHRwOi8vZ2Nj 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