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C++ has a __cplusplus preprocessor define that lets you detect the version. Is there anything similar for C?
Preferably I'd like it to be portable across XCode, GCC, and Visual Studio versions.
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The C preprocessor is a macro preprocessor (allows you to define macros) that transforms your program before it is compiled. These transformations can be the inclusion of header files, macro expansions, etc.
Preporcessor: the program that does the preprocessing (file inclusion, macro expansion, conditional compilation). Macro: a word defined by the #define preprocessor directive that evaluates to some other expression. Preprocessor directive: a special #-keyword, recognized by the preprocessor.
Macro expansion overviewThe preprocessor maintains a context stack, implemented as a linked list of cpp_context structures, which together represent the macro expansion state at any one time. The struct cpp_reader member variable context points to the current top of this stack.
The #ifndef directive checks for the opposite of the condition checked by #ifdef . If the identifier hasn't been defined, or if its definition has been removed with #undef , the condition is true (nonzero). Otherwise, the condition is false (0). The identifier can be passed from the command line using the /D option.
As per article on Wikipedia on C99
A standard macro __STDC_VERSION__ is defined with value 199901L to indicate that C99 support is available
#if __STDC_VERSION__ >= 199901L
/*C99*/
#else
/*Not C99*/
#endif
You can test the value of the macro __STDC_VERSION__ (note there are two underscores in the beginning and in the end), it should be larger than or equal to 199901L for C99 compatible platforms.
C11(ISO/IEC 9899:201x) §6.10.8.1 Mandatory macros
__STDC_VERSION__The integer constant201ymmL.
In the footnote:
This macro was not specified in ISO/IEC 9899:1990 and was specified as
199409Lin ISO/IEC 9899/AMD1:1995 and as199901Lin ISO/IEC 9899:1999. The intention is that this will remain an integer constant of typelong intthat is increased with each revision of this International Standard.
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