-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