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Compliant Solution (Testing for definition of macro)

In this compliant examplesolution, the definition of the predefined macro __STDC__ is tested before the value of the macro is tested:

#include <stdio.h>

int main(void) {
  #if defined(__STDC__)
    #if (__STDC__ == 1)
      printf("Implementation is ISO-conforming.\n");
    #else
      printf("Implementation is not ISO-conforming.\n");
    #endif
  #else   /* !defined(__STDC__) */
    printf("__STDC__ is not defined.\n");
  #endif
  /* ... */
  return 0;
}

Compliant Solution (Test for Optional feature)

The follow example This compliant solution tests to see if the C11 predefined macro __STDC_ANALYZABLE__ is defined and what value the implementation has given the macro:

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Compliant Solution (Optional Language Features)

The following example This compliant solution checks for the C11 optional language features in Annex K.  If Annex K is supported by the implementation, the functions defined in Annex K are used, if Annex K is not supported, then the Standard library functions are used.   (See DCL09-C. Declare functions that return errno with a return type of errno_t.)

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