Well, I am specifying: set(CMAKE_CXX_STANDARD_REQUIRED ON) set(CMAKE_CXX_STANDARD 17) set(CMAKE_CXX_EXTENSIONS ON)
and the compiler line contains “-std=gnu++1y”. I’m using a very recent source build of CLang and libc++. Any idea why cmake would fall back to 1y in this case? > On May 6, 2018, at 9:05 AM, Jean-Michaël Celerier > <jeanmichael.celer...@gmail.com> wrote: > > Note that c++17 is c++1z. c++1y was C++14. > > > > ------- > Jean-Michaël Celerier > http://www.jcelerier.name <http://www.jcelerier.name/> > On Sun, May 6, 2018 at 5:00 PM, Andrew Brownsword > <andrew.e.brownsw...@gmail.com <mailto:andrew.e.brownsw...@gmail.com>> wrote: > Hi, > > Is there a way to get cmake 3.11 to emit 17 vs 1y when setting > CMAKE_CXX_STANDARD? I’m finding that it seems to be a common practice to use > the value of the preprocessor define __cplusplus (which is a date), and the > value differs depending on whether 17 or 1y is used (at least with CLang). I > haven’t figured out how to get cmake to emit -std=c++17, it always seems to > use 1y, which is causing problems with code that assumes the __cplusplus date > reflects the c++17 standardization date. > > Thanks, > Andrew > > -- > > Powered by www.kitware.com <http://www.kitware.com/> > > Please keep messages on-topic and check the CMake FAQ at: > http://www.cmake.org/Wiki/CMake_FAQ <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 > <http://cmake.org/cmake/help/support.html> > CMake Consulting: http://cmake.org/cmake/help/consulting.html > <http://cmake.org/cmake/help/consulting.html> > CMake Training Courses: http://cmake.org/cmake/help/training.html > <http://cmake.org/cmake/help/training.html> > > Visit other Kitware open-source projects at > http://www.kitware.com/opensource/opensource.html > <http://www.kitware.com/opensource/opensource.html> > > Follow this link to subscribe/unsubscribe: > https://cmake.org/mailman/listinfo/cmake > <https://cmake.org/mailman/listinfo/cmake> >
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