-ansi

Controls the ISO/IEC 9899-1990 ("C90") conformance options, overriding the given settings.

  -ansi keyword  

The arguments for keyword are:

off

Turns ISO conformance off. Same as

  -stdkeywords off -enum min -strict off   

on | relaxed

Turns ISO conformance on in relaxed mode. Same as

  -stdkeywords on -enum min -strict on   

strict

Turns ISO conformance on in strict mode. Same as

  -stdkeywords on -enum int -strict on