https://blogs.gentoo.org/ago/2020/07/04/gentoo-tinderbox/ Issue: sci-visualization/gr-0.53.0 fails to compile (lto). Discovered on: amd64 (internal ref: lto_tinderbox) NOTE: This machine uses lto with CFLAGS=-flto -Werror=odr -Werror=lto-type-mismatch -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
Created attachment 797161 [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 Cairo (missing: CAIRO_LIBRARY) (found version "1.16.0") -- Could NOT find Ffmpeg (missing: FFMPEG_TEST_COMPILED FFMPEG_LIBRARY_AVFORMAT FFMPEG_LIBRARY_AVCODEC FFMPEG_LIBRARY_SWSCALE FFMPEG_LIBRARY_AVUTIL) (Required is at least version "57.48.100") -- Could NOT find Freetype (missing: FREETYPE_LIBRARY) (found version "2.12.1") -- Could NOT find Gs (missing: GS_LIBRARY GS_INCLUDE_DIR GS_VERSION_STRING) -- Could NOT find Qt5Network (missing: Qt5Network_DIR) -- Could NOT find Qt5Widgets (missing: Qt5Widgets_DIR) -- Could NOT find Tiff (missing: TIFF_LIBRARY TIFF_INCLUDE_DIR TIFF_VERSION_STRING) -- Could NOT find Zeromq (missing: ZEROMQ_LIBRARY ZEROMQ_INCLUDE_DIR ZEROMQ_VERSION_STRING) (Required is exact version "4.0") FAILED: libGR3.so <built-in>: error: type of ‘__builtin_sqrtf’ does not match original declaration [-Werror=lto-type-mismatch]
This no longer occurs in sci-visualization/gr-0.72.4
