C99 - Version Detection

Version Detection

A standard macro __STDC_VERSION__ is defined with value 199901L to indicate that C99 support is available. As with the __STDC__ macro for C90, __STDC_VERSION__ can be used to write code that will compile differently for C90 and C99 compilers, as in this example that ensures that inline is available in either case (by replacing it with static in C90 to avoid linker errors.)

#if __STDC_VERSION__ >= 199901L /* "inline" is a keyword */ #else # define inline static #endif