target_compile_options() for only C++ files?

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Solution

You can do this with generator expressions:

target_compile_options(MyLib PUBLIC $<$<COMPILE_LANGUAGE:CXX>:-std=c++14>)

Alternative

But the more platform independent way of doing it in this particular case would be to use target_compile_features(). I’m not sure which compiler feature you’re using, so the following is only an example:

target_compile_features(MyLib PUBLIC cxx_explicit_conversions)

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