Alternative summary: Installing unstable firefox (which requires llvm:8) breaks kdevelop. Emerging kdevelop links with llvm:8, if present. Emerging mesa links with <llvm-8. Running kdevelop first loads mesa which loads llvm-7, then loads llvm-8 directly. This causes problems. Not sure whether this is a Gentoo bug, LLVM bug, KDevelop bug, or if having llvm:8 installed while stable mesa is present is just unsupported. ---- $ kdevelop Connecting to deprecated signal QDBusConnectionInterface::serviceOwnerChanged(QString,QString,QString) : CommandLine Error: Option 'help-list' registered more than once! LLVM ERROR: inconsistency in registered CommandLine options ---- $ strace kdevelop 2>&1| grep lib64/libLLVMCore openat(AT_FDCWD, "/usr/lib/llvm/7/lib64/libLLVMCore.so.7.1", O_RDONLY|O_CLOEXEC) = 13 openat(AT_FDCWD, "/usr/lib64/llvm/8/lib64/../lib64/../lib64/libLLVMCore.so.8", O_RDONLY|O_CLOEXEC) = 60 ---- $ strace kdevelop 2>&1| grep lib64/../lib64/../lib64/../lib64/../lib64 openat(AT_FDCWD, "/usr/lib64/llvm/8/lib64/../lib64/../lib64/../lib64/../lib64/tls/x86_64/x86_64/libLLVMAsmParser.so.8", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory) [more log truncated]
*** This bug has been marked as a duplicate of bug 651658 ***
