For a comparison, an optimized release build of Clang 5.0 trunk (from a few days ago, built with Clang 5.0 trunk from like a week ago) with assertions enabled i

For a comparison, an optimized release build of Clang 5.0 trunk (from a few days ago, built with Clang 5.0 trunk from like a week ago) with assertions enabled is 87mb -- with the LLVM libraries linked in, but dynamically linked to system libraries, on my Fedora 25 machine. A debug build of clang is normally hundreds of megabytes (~600mb IIRC, and normal linkers go bonkers dealing with it), so if LLD is actually only 2.5x slower than 'cp' at -O0, that's quite good I think. The next question is how much memory LLD uses vs the competition in this test...