The following issue has been SUBMITTED. ====================================================================== http://www.cmake.org/Bug/view.php?id=15741 ====================================================================== Reported By: Raphael Kubo da Costa Assigned To: ====================================================================== Project: CMake Issue ID: 15741 Category: CMake Reproducibility: N/A Severity: major Priority: normal Status: new ====================================================================== Date Submitted: 2015-09-13 14:14 EDT Last Modified: 2015-09-13 14:14 EDT ====================================================================== Summary: GCC < 4.9 does not have full C11 support Description: As of version 3.3.1, CMake sets CMAKE_C11_{STANDARD,EXTENSION}_COMPILE_OPTION for GCC >= 4.7, and checks for C11 features for GCC >= 4.6. Additionally, it means CMake itself will be built with -std=gnu11 if GCC >= 4.7 is used.
However, GCC only has full C11 support with the 4.9 release (https://gcc.gnu.org/wiki/C11Status). Specifically, support for C11's _Thread_local is only present on GCC >= 4.9. This combination makes CMake fail to build with GCC 4.7 and 4.8 on FreeBSD, as runetype.h uses _Thread_local and the fact that -std=gnu11 is passed makes it not be a typedef or define for something else that would work. In https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=203066, it was argued that this is GCC's fault for advertising C11 support in 4.7 and 4.8 before it was fully ready. Before sending a patch to GNU-C.cmake, I'd like to check if it makes sense or what the best approach would be. ====================================================================== Issue History Date Modified Username Field Change ====================================================================== 2015-09-13 14:14 Raphael Kubo da CostaNew Issue ====================================================================== -- Powered by www.kitware.com Please keep messages on-topic and check the CMake FAQ at: http://www.cmake.org/Wiki/CMake_FAQ Kitware offers various services to support the CMake community. For more information on each offering, please visit: CMake Support: http://cmake.org/cmake/help/support.html CMake Consulting: http://cmake.org/cmake/help/consulting.html CMake Training Courses: http://cmake.org/cmake/help/training.html Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html Follow this link to subscribe/unsubscribe: http://public.kitware.com/mailman/listinfo/cmake-developers
