C++ code file extension? .cc vs .cpp
I have seen C++ code saved as both .cc and .cpp files. Is there a difference between the two?
The Google style guide seems to suggest .cc , but provides no explanation.
I am mainly concerned with programs on Linux systems.
At the end of the day it doesn't matter because C++ compilers can deal with the files in either format. If it's a real issue within your team, flip a coin and move on to the actual work.
GNU GCC recognises all of the following as C++ files, and will use C++ compilation regardless of whether you invoke it through gcc or g++: .C , .cc , .cpp , .CPP , .c++ , .cp , or .cxx .
Note the .C - case matters in GCC, .c is a C file whereas .C is a C++ file (if you let the compiler decide what it is compiling that is).
GCC also supports other suffixes to indicate special handling, for example a .ii file will be compiled as C++, but not pre-processed (intended for separately pre-processed code). All the recognised suffixes are detailed at gcc.gnu.org
Great advise on which to use for the makefile and other tools, considering non-compiler tools while deciding on which extension to use is a great approach to help find an answer that works for you.
I just wanted to add the following to help with some .cc vs .cpp info that I found. The following are extensions broken down by different environments (from "C++ Primer Plus" book):
Unix uses: .C , .cc , .cxx , .c
GNU C++ uses: .C , .cc , .cxx , .cpp , .c++
Digital Mars uses: .cpp , .cxx
Borland C++ uses: .cpp
Watcom uses: .cpp
Microsoft Visual C++ uses: .cpp , .cxx , .cc
Metrowerks CodeWarrior uses: .cpp , .cp , .cc , .cxx , .c++
The different environments support different extensions. I too was looking to answer this question and found this post. Based on this post I think I might go with .hpp and .cpp for ease of cross-platform/cross-tool recognition.
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