Hello, On Ubuntu 14.04 LTS with GCC 4.6.4 and 4.8.2, the tests "test-lock" and "test-thread_create" fail. They do not fail on same system with GCC 4.4.7 or Clang-3.3 .
Confirmed also by Daiki Uenu: http://lists.gnu.org/archive/html/bug-libunistring/2014-09/msg00005.html From a brief look it seems the "pthread_cancel" is using weak linking, and is somehow not properly found by the binary: http://lists.gnu.org/archive/html/bug-libunistring/2014-09/msg00002.html It was found through libunistring but I've also reproduced it with the latest gnulib directly (v0.1-210-g4738e5a), with: ./gnulib/gnulib-tool --create-testdir --dir=test-thread --with-tests thread cd test-thread ./configure && make && make check After running "./configure CC=xxx" with different compilers, the only difference I could spot (besides the obvious string change of "gcc-4.4" vs "gcc-4.8") is the following two additional lines appearing in "config.log" with gcc 4.6/4.8: COLLECT_GCC=gcc-4.8 COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/4.8/lto-wrapper Using gcc-4.4 and clang-3.3 do not produce these lines in "config.log". "config.h" is identical in all versions. I can investigate further if you point me where to look. - Assaf
