C99 standard predefined marco

the C99 standard has the following:

6.10.8 Predefined macro names

The following macro names shall be defined by the implementation:

__DATE__ 
__FILE__ 
__LINE__ 
__STDC__ 
__STDC_HOSTED__ 
__STDC_MB_MIGHT_NEQ_WC__ 
__STDC_VERSION__ 
__TIME__

The following macro names are conditionally defined by the implementation:

__STDC_IEC_559__ 
__STDC_IEC_559_COMPLEX__ 
__STDC_ISO_10646__

6.4.2.2 Predefined identifiers

The identifier __func__ shall be implicitly declared by the translator as if, immediately following the opening brace of each function definition, the declaration

     static const char __func__[] = "function-name";