http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55354
--- Comment #28 from Konstantin Serebryany <konstantin.s.serebryany at gmail dot com> 2012-11-23 11:14:58 UTC --- Note that today's upstream tsan sources don't link with -fPIC at all because our assembly blobs are not PIC-friendly. /usr/bin/ld: .libs/tsan_rtl_thread.o: relocation R_X86_64_PC32 against undefined symbol `__tsan_trace_switch_thunk' can not be used when making a shared objec Apparently, Wei hacked this around by enabling pure-C++ code, which is slower.
