Re: detecting an iso C99 environment

[Aaron Isotton <aaron@isotton.com>]

Warren Turkal <wturkal@cbu.edu> writes:

> How do I detect an ISO C99 environment via C preproccessor directives?
> Warren

In C99 __STDC_VERSION__ is defined as 199901L.  Thus, something like
this should work:

#ifdef __STDC_VERSION__
    #if (__STDC_VERSION__ == 199901L)
        /* okay */
    #else
        /* __STDC_VERSION__ is defined but not 199901L */
        #error This compiler is not C99-compliant!
    #endif
#else
    /* __STDC_VERSION__ is not defined */
    #error This compiler is not C99-compliant!
#endif

You can read more about that in the C99 standard, ANSI/ISO/IEC
9899-1999 in paragraph 6.10.8.
-- 
Aaron Isotton

http://www.isotton.com/
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