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I have an externally provided .cpp file. It is a mixture of C compatible code and a bit of C++ as well. The C++ code is just a wrapper around the C to take advantage of C++ features.
It uses #ifdef __cplusplus macros to protect the C++ code, which is great. Unfortunately, if I try to compile using GCC, it treats it as C++ because of the file ending. I'm aware of the differences between gcc and g++ - I don't want to compile as C++.
Is there any way I can force GCC to treat this file as a C file? I've tried using e.g. --std=c99, but this correctly produces the error that C99 isn't valid for C++.
Renaming the file to .c works, but I'd like to avoid this if possible because it's externally provided and it'd be nice for it to remain as a pristine copy.
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The compiler does not ensure that your program is logically correct. The compiler we use is the GNU (Gnu is not Unix) Open Source compiler. G++ is the name of the compiler. (Note: G++ also compiles C++ code, but since C is directly compatible with C++, so we can use it.).
cpp files but they will be treated as C++ files only. gcc can compile any . c or . cpp files but they will be treated as C and C++ respectively.
No. C++ -> C was used only in the earliest phases of C++'s development and evolution. Most C++ compilers today compile directly to assembler or machine code. Borland C++ compiles directly to machine code, for example.
C++ is well-known and popular. It's nearly a superset of C90, which GCC was then written in. The C subset of C++ is as efficient as C. C++ "supports cleaner code in several significant cases." It never requires "uglier" code.
The -x option for gcc lets you specify the language of all input files following it:
$ gcc -x c your-file-name.cpp If you only want to special-case that one file, you can use -x none to shut off the special treatment:
$ gcc -x c your-filename.cpp -x none other-file-name.cpp (your-filename.cpp will be compiled as C, while other-file-name.cpp will use the extension and compile as C++)
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