Calling target_compile_features with a cxx feature on a C project cause segfault
Not a big deal, but not how I'd expect Cmake to handle this scenario. cmake version 3.8.1, OSX 10.12.5 CMakeLists.txt: ``` cmake_minimum_required(VERSION 3.8.1) project(Example LANGUAGES C) add_library(Example dummy.c) target_compile_features(Example PRIVATE cxx_enum_forward_declarations) ``` Result: Segmentation fault: 11
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