Created attachment 647496 [details] Output of emerge --info Build fails, log shows these failures when linking: x86_64-pc-linux-gnu-g++ -Wl,-O1 -Wl,--as-needed -Wl,-z,origin '-Wl,-rpath,$ORIGIN:$ORIGIN/..:$ORIGIN/../lib64/qtcreator' -Wl,--no-undefined -Wl,-z,origin -Wl,-rpath,/usr/lib/llvm/10/lib64 -Wl,--exclude-libs,ALL -shared -Wl,-soname,libClangFormat.so -o libClangFormat.so .obj/release-shared/clangformatconfigwidget.o .obj/release-shared/clangformatindenter.o .obj/release-shared/clangformatplugin.o .obj/release-shared/clangformatutils.o .obj/release-shared/moc_clangformatconfigwidget.o .obj/release-shared/moc_clangformatplugin.o -L/mnt/spinner/tmp/portage/dev-qt/qt-creator-4.8.2/work/qt-creator-opensource-src-4.8.2/lib64/qtcreator -L/mnt/spinner/tmp/portage/dev-qt/qt-creator-4.8.2/work/qt-creator-opensource-src-4.8.2/lib64/qtcreator/plugins -lCppTools -lProjectExplorer -lTextEditor -lCore -lCPlusPlus -lQtcSsh -lAggregation -lExtensionSystem -lUtils -L/usr/lib/llvm/10/lib64 -lclangFormat -lclangToolingInclusions -lclangToolingCore -lclangRewrite -lclangLex -lclangBasic -lLLVM-10 /usr/lib64/libQt5Widgets.so /usr/lib64/libQt5Gui.so /usr/lib64/libQt5Concurrent.so /usr/lib64/libQt5Network.so /usr/lib64/libQt5Core.so -lGL -lpthread /usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/../../../../x86_64-pc-linux-gnu/bin/ld: cannot find -lclangFormat /usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/../../../../x86_64-pc-linux-gnu/bin/ld: cannot find -lclangToolingInclusions /usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/../../../../x86_64-pc-linux-gnu/bin/ld: cannot find -lclangToolingCore /usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/../../../../x86_64-pc-linux-gnu/bin/ld: cannot find -lclangRewrite /usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/../../../../x86_64-pc-linux-gnu/bin/ld: cannot find -lclangLex /usr/lib/gcc/x86_64-pc-linux-gnu/9.2.0/../../../../x86_64-pc-linux-gnu/bin/ld: cannot find -lclangBasic collect2: error: ld returned 1 exit status
qt-creator build cannot find /usr/lib/llvm/10/lib64/libclangFormat.so The just-installed version of sys-devel/clang-10.0.0 installed these files: /usr/lib/llvm/9/lib64/libclangFormat.so /usr/lib/llvm/9/lib64/libclangFormat.so.9 So maybe this is a problem with sys-devel/clang, not qt-creator.
I added symlinks to the missing files in /usr/lib/llvm/10/lib64 to the versions present in /usr/lib/llvm/9/lib64. Then qt-creator will emerge successfully. It seems to run OK. After finishing the emerge of qt-creator, emerge --depclean removed sys-devel/llvm-9.0.1, so now the missing library files are once again gone. In any case, I got it to emerge, so problem solved for now. I found this mention of the problem at https://bugs.archlinux.org/task/66283 upgpkg: clang 10.0.0-1: new upstream release; switch to libclang-cpp We no longer build with BUILD_SHARED_LIBS=ON; programs linking to clang are required to link to libclang-cpp.so instead of individual libraries. Gentoo and Fedora have moved in this direction as well, with the latter being documented at https://bugzilla.redhat.com/show_bug.cgi?id=1787375.
Joining the "me too" bandwagon
I borrowed the patch from bug#711788 and adapted it to the 4.8.2 codebase. It builds fine and it seems to work.
Created attachment 647606 [details, diff] The patch from bug#711788, adapted it to the 4.8.2 codebase
*** This bug has been marked as a duplicate of bug 711788 ***
