Created attachment 624016 [details] output of "emerge --info" TL;DR: LDFLAGS was not passed to QMAKE_LFLAGS during the installation phase. Long story: This clang+LTO package.env setup breaks the build: CC="clang" CXX="clang++" CFLAGS="${CFLAGS} -flto" CXXFLAGS="${CXXFLAGS} -flto" LDFLAGS="${LDFLAGS} -fuse-ld=gold -flto -Wl,-O2 -Wl,--as-needed" qmake is linked twice: one during the compile phase for bootstrapping, and the other during the installation phase for the final image. Both link commands are specified in qtbase-everywhere-src-5.14.1/qmake/Makefile: $(BUILD_PATH)/bin/qmake$(EXEEXT): $(OBJS) $(QOBJS) qlibraryinfo.o $(CXX) -o "$@" $(OBJS) $(QOBJS) qlibraryinfo.o $(LFLAGS) $(BUILD_PATH)/qmake/qmake$(EXEEXT): $(OBJS) $(QOBJS) qlibraryinfo_final.o $(CXX) -o "$@" $(OBJS) $(QOBJS) qlibraryinfo_final.o $(LFLAGS) The error happens during the latter link command. The linker consumes object files compiled with "-flto", without proper flags to recognize them. This is because LDFLAGS with lto options was not correctly passed to QMAKE_LFLAGS, which derives to $(LFLAGS). Link commands in the full build log is pasted here for comparison: clang++ -o "../bin/qmake" ...(a lot of object files)... qlibraryinfo.o -Wl,-O1 -Wl,--as-needed -fuse-ld=gold -flto -Wl,-O2 -Wl,--as-needed -Wl,--gc-sections ... >>> Source compiled. ... >>> Install dev-qt/qtcore-5.14.1-r1 into /var/tmp/portage/dev-qt/qtcore-5.14.1-r1/image ... clang++ -o "../qmake/qmake" ...(a lot of object files)... qlibraryinfo_final.o -ccc-gcc-name g++ -Wl,--gc-sections As can be seen, LDFLAGS are passed correctly in the compile phase but not in the installation phase. I guess this has something to do with eclasses but I'm not sure.
Created attachment 624018 [details] full build log
This bug has been breaking my builds too, (causing complications with my cross-distcc setup as well as lto issues)
(it also calls just g++/gcc or just clang/clang++ irrespective of CC/CXX during that install phase breaking cross distcc)
Created attachment 693228 [details] aarch64 full build log (doesn't respect CC/CXX either) "g++ -o "../qmake/qmake" main.o meta.o option.o project.o property.o ioutils.o proitems.o qmakebuiltins.o qmakeevaluator.o qmakeglobals.o qmakeparser.o qmakevfs.o pbuilder_pbx.o makefile.o makefiledeps.o metamakefile.o projectgenerator.o unixmake2.o unixmake.o mingw_make.o msbuild_objectmodel.o msvc_nmake.o msvc_objectmodel.o msvc_vcproj.o msvc_vcxproj.o winmakefile.o xmloutput.o qutfcodec.o qendian.o qglobal.o qlogging.o qmalloc.o qnumeric.o qoperatingsystemversion.o qrandom.o qabstractfileengine.o qbuffer.o qdatastream.o qdebug.o qdir.o qdiriterator.o qfile.o qfiledevice.o qfileinfo.o qfilesystemengine.o qfilesystementry.o qfsfileengine.o qfsfileengine_iterator.o qiodevice.o qsettings.o qtemporaryfile.o qtextstream.o qcborstreamwriter.o qcborvalue.o qjsoncbor.o qjsonarray.o qjsondocument.o qjsonobject.o qjsonparser.o qjsonvalue.o qmetatype.o qsystemerror.o qvariant.o quuid.o qarraydata.o qbitarray.o qbytearray.o qbytearraylist.o qbytearraymatcher.o qcalendar.o qgregoriancalendar.o qromancalendar.o qcryptographichash.o qdatetime.o qhash.o qlist.o qlocale.o qlocale_tools.o qmap.o qregexp.o qringbuffer.o qstringbuilder.o qstring.o qstringlist.o qversionnumber.o qvsnprintf.o qxmlstream.o qxmlutils.o qcore_unix.o qfilesystemengine_unix.o qfilesystemiterator_unix.o qfsfileengine_unix.o qlocale_unix.o qlibraryinfo_final.o -Wl,--gc-sections" when CXX was explicitly set to aarch64-unknown-linux-gnu-g++. The error in this build.log is the result of the plain g++/gcc getting handed over to distcc and my desktop happily sending over x86_64 objects.
Is this relevant in any shape or form? https://github.com/BilyakA/gentoo-clang/blob/master/eclass/qt5-build.eclass
The bug has been closed via the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=2d51131e1ec7aa03f22a2f2864237fdc3d4dc146 commit 2d51131e1ec7aa03f22a2f2864237fdc3d4dc146 Author: Andreas Sturmlechner <asturm@gentoo.org> AuthorDate: 2023-12-07 17:56:50 +0000 Commit: Andreas Sturmlechner <asturm@gentoo.org> CommitDate: 2023-12-12 12:56:01 +0000 qt5-build.eclass: filter-lto Closes: https://bugs.gentoo.org/650488 Closes: https://bugs.gentoo.org/692078 Closes: https://bugs.gentoo.org/713850 Closes: https://bugs.gentoo.org/908419 Closes: https://bugs.gentoo.org/652158 Closes: https://bugs.gentoo.org/919043 Signed-off-by: Andreas Sturmlechner <asturm@gentoo.org> eclass/qt5-build.eclass | 3 +++ 1 file changed, 3 insertions(+)
