[CMake] How to choose different complier?

[董隆超]

Hi,everybody

I am new to CMake and I have a question.
I think CMake choose complier based on the file name.If it is ".cpp",CMake will use g++, if it is ".c",gcc will be used.Is it right?So to switch between g++ and gcc,I have to change the file name every time.I know this is very stupid,but I really do not know how to choose special complier by hand.If the file name is ended with ".c",I want to use g++ to compile it.So how to do?
Thank you in advance.

Longchao
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