Created attachment 671605 [details] build.log Building llvm-11.0.0 fails when lto is enabled. See build.log. Workaround: Disabling lto. Sidenote: I think llvm-10.x was built successfully with lto.
It's usually a good idea to search for a bug with the exact same package version and the exact same error message. *** This bug has been marked as a duplicate of bug 749162 ***