Asked 13/3, 2012 at 10:51 Answered 6/3, 2019 at 6:9

302

Sorry for asking very basic question. I would like to set OR condition in #ifdef directive.? How to do that ? I tried

#ifdef LINUX | ANDROID
...
..
#endif

It did not work? What is the proper way?

Colton answered 13/3, 2012 at 10:51 Comment(2)

If you're using | for "or" in your C conditionals too, you're doing it wrong. – Garpike 25/9, 2015 at 1:0

Hence the visit to SO to find out how to do it not-wrong. – Sauer 12/11, 2021 at 20:59

613

Like this

#if defined(LINUX) || defined(ANDROID)

Carmella answered 13/3, 2012 at 10:52 Comment(0)

OR condition in #ifdef

#if defined LINUX || defined ANDROID
// your code here
#endif /* LINUX || ANDROID */

or-

#if defined(LINUX) || defined(ANDROID)
// your code here
#endif /* LINUX || ANDROID */

Both above are the same, which one you use simply depends on your taste.

P.S.: #ifdef is simply the short form of #if defined, however, does not support complex condition.

Further-

Nude answered 6/3, 2019 at 6:9 Comment(0)