http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55374
--- Comment #13 from Jakub Jelinek <jakub at gcc dot gnu.org> 2013-01-22 10:33:53 UTC --- The patch isn't sufficient. For both -static-libasan -fsanitize=address and just -fsanitize=address, we want -Bstatic -lasan -Bdynamic resp. -lasan to go before all occurrences of the -lstdc++ or -lpthread or -lc, whether those come from user command line options or language specific driver hacks or specs expansion. For dynamic -lasan it is obviously enough if it goes before the first occurrence of -lstdc++, -lpthread or -lc, whatever is first, so in theory we could just add it as the very first (or one of the first) ld/collect2 command line options. libasan unfortunately crashes badly (without giving useful messages) if e.g. -lpthread comes before -lasan. And -lpthread can either come from -pthread on the command line, or -lpthread, similarly -lstdc++ from just linking with g++, or from -lstdc++ on the command line. Unfortunately, -Wl,-Bstatic resp. -Wl,-Bdynamic might be passed directly on the command line too, at random positions, so adding blindly -Bstatic -lasan -Bdynamic isn't very good idea either, especially because those options aren't counted, -Bstatic -Bstatic -lasan -Bdynamic will result in -Bdynamic after it.
