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

http://stackoverflow.com/questions/11394659/where-does-the-value-of-cxx-in-a-makefile-come-from

https://www.gnu.org/software/make/manual/make.html#Implicit-Variables


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

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利用ffmpeg取出ts流中特定的program

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