Nearly all the Teeks clang tests are in C++98 mode in-spite of their names, for example http://www.boost.org/development/tests/develop/developer/ is listed as "C++14" but is actually C++98 (check the __cpluplus version). Which means the tests all sort of duplicate each other :(output/teeks99-02-dc3-5-14- Docker-64on64-boost-bin-v2- libs-config-test-config_test- test-clang-linux-3-5~c++14- debug.html