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Where does the value of CXX in a makefile come from?

I'm currently working on a makefile of a legacy project. The project build successfully with the Makefile.

While inspecting the Makefile, I noticed that it uses ${CXX} macro to call the compiler. However, the CXX is not defined in the makefile, and there's no includes of other makefiles.

I tried to see if CXX is an environmental variable, it is not.

Is there a default value for CXX ?

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stdcall
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1 Answers1

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It's in the manual:

CXX
    Program for compiling C++ programs; default ‘g++’.
Paul R
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