C++ version check can create broken configurations
The C++ version check in
CheckCXXFeatures.cmake supports a variable
DISABLE_CXX_VERSION_CHECK that turns off all attempts to switch the compiler into a specific C++ standard mode. That doesn't really work for the current master anymore because we now require at least C++11. Would it perhaps be more useful to instead have something like
LIMIT_CXX_VERSION_CHECK that can be set to something like
14 (or in the future
17)? Right now, in order to have my compiler use C++11 instead of C++14, I have to define
DISABLE_CXX_VERSION_CHECK and stick
-std=c++11 into my
CMAKE_CXX_FLAGS, which isn't very intuitive...
In any case, the test should always make sure that we are running at least in C++11 mode and bail out if we don't (maybe by checking the value of the
__cplusplus macro, which is set to a sane value by all current compilers - GCC does so since at least 4.8).