c99

Controls the use of a subset of ISO/IEC 9899-1999 ("C99") language features.

#pragma c99 on | off | reset
  

If you enable this pragma, the compiler accepts many of the language features described by the ISO/IEC 9899-1999 standard:

• More rigid type checking.
• Trailing commas in enumerations.
• GCC/C99-style compound literal values.
• Designated initializers.
• __func__ predefined symbol.
• Implicit return 0; in main() .
• Non- const static data initializations.
• Variable argument macros ( __VA_ARGS__ ).
• bool and _Bool support.
• long long support (separate switch).
• restrict support.
• // comments.
• inline support.
• Digraphs.
• _Complex and _Imaginary (treated as keywords but not supported).
• Empty arrays as last struct members.
• Designated initializers
• Hexadecimal floating-point constants.
• Variable length arrays are supported within local or function prototype scope (as required by the C99 standard).
• Unsuffixed decimal constant rules.
• ++bool-- expressions.
• (T) (int-list) are handled/parsed as cast-expressions and as literals.
• __STDC_HOSTED__ is 1 .

By default, this pragma is disabled.