Summary: | media-sound/mixxx-2.3.3-r1 fails to compile (lto): kaitaistream.cpp:258:37: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing] | ||
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Product: | Gentoo Linux | Reporter: | Agostino Sarubbo <ago> |
Component: | Current packages | Assignee: | Professional Audio Applications Maintainers <proaudio> |
Status: | RESOLVED FIXED | ||
Severity: | normal | CC: | eschwartz93, fordfrog |
Priority: | Normal | ||
Version: | unspecified | ||
Hardware: | All | ||
OS: | Linux | ||
See Also: | https://bugs.gentoo.org/show_bug.cgi?id=877761 | ||
Whiteboard: | |||
Package list: | Runtime testing required: | --- | |
Bug Depends on: | |||
Bug Blocks: | 618550 | ||
Attachments: | build.log |
Description
Agostino Sarubbo
2022-07-25 06:53:36 UTC
Created attachment 794165 [details]
build.log
build log and emerge --info
Error(s) that match a know pattern in addition to what has been reported in the summary: -- Could NOT find FFMPEG (missing: FFMPEG_LIBRARIES FFMPEG_INCLUDE_DIRS FFMPEG_libavcodec_LIBRARIES FFMPEG_libavcodec_INCLUDE_DIRS FFMPEG_libavformat_LIBRARIES FFMPEG_libavformat_INCLUDE_DIRS FFMPEG_libavutil_LIBRARIES FFMPEG_libavutil_INCLUDE_DIRS FFMPEG_libswresample_LIBRARIES FFMPEG_libswresample_INCLUDE_DIRS) -- Could NOT find KeyFinder (missing: KeyFinder_LIBRARY KeyFinder_INCLUDE_DIR) (Required is at least version "2.2.6") -- Could NOT find MAD (missing: MAD_LIBRARY MAD_INCLUDE_DIR) -- Could NOT find MP4 (missing: MP4_LIBRARY MP4_INCLUDE_DIR) -- Could NOT find MP4v2 (missing: MP4v2_LIBRARY MP4v2_INCLUDE_DIR) -- Could NOT find Modplug (missing: Modplug_LIBRARY Modplug_INCLUDE_DIR) -- Could NOT find Opus (missing: OpusFile_LIBRARY OpusFile_INCLUDE_DIR) -- Could NOT find ccache (missing executable) -- Could NOT find lilv (missing: lilv_LIBRARY lilv_INCLUDE_DIR) -- Could NOT find wavpack (missing: wavpack_LIBRARY wavpack_INCLUDE_DIR) FAILED: CMakeFiles/Kaitai.dir/lib/kaitai/kaitaistream.cpp.o /var/tmp/portage/media-sound/mixxx-2.3.3/work/mixxx-2.3.3/lib/kaitai/kaitaistream.cpp:258:37: error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing] Here is a bit of explanation: -Werror=lto-type-mismatch: User to find possible runtime issues in packages. It likely means the package is unsafe to build & use with LTO. For projects using the same identifier but with different types across different files, they must be fixed to be consistent across the codebase. -Werror=odr: Used to find possible runtime issues in packages. These bugs are a problem anyway but may be even worse when combined with LTO. C++ code must comply with the One Definition Rule (ODR) - see https://en.cppreference.com/w/cpp/language/definition#One_Definition_Rule. -Werror=strict-aliasing: Used to find possible runtime issues in packages. These bugs are a problem anyway but may be even worse when combined with LTO. Workarounds: - If upstream is friendly and still active, file a bug upstream. For emulators, codecs, games, or multimedia packages, it may be worth just applying a workaround instead, as upstreams sometimes aren't receptive to these bugs (VALID FOR ALL). - Use the new 'filter-lto' from flag-o-matic.eclass as it's likely to be unsafe with LTO (VALID FOR lto-type-mismatch - odr). - Fix it yourself if interested, of course (VALID FOR ALL). - Append-flags -fno-strict-aliasing (VALID FOR strict-aliasing). - Use memcpy() but a union is sometimes suitable too (VALID FOR strict-aliasing). - -fstrict-aliasing is implied by -O2, so this must be addressed in some form (VALID FOR strict-aliasing). See also: https://marc.info/?l=gentoo-dev&m=165639574126280&w=2 lto_tinderbox has reproduced this issue with version 2.3.3-r1 - Updating summary. can't reproduce with 2.3.6, closing. |