On 2 February 2017 at 13:48, Vincent Lefevre wrote: > However, it yields false positives on code that doesn't contain any > ambiguity (and is easier to read than lengthier code), such as: > > #if __STDC_VERSION__ < 199901L > > Since __STDC_VERSION__ is a standard macro, it is quite obvious that > even if __STDC_VERSION__ is not defined, this is not a typo. So, IMHO, > -Wundef should whitelist some common macros (and/or perhaps let the > user provide his own whitelist). Yes, it seems reasonable to not warn for __STDC_VERSION__ in C89 mode. If you spell it wrong it won't match the whitelist and so you'll still get a warning.
