how to use #ifdef with an OR condition?

Question

I would like to set OR condition in #ifdef directive.?

I tried:

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

It did not work? What is the proper way?

If you're using | for "or" in your C conditionals too, you're doing it wrong. — Jonathon Reinhart
– Jonathon Reinhart, Commented Sep 25, 2015 at 1:00

zvrba · Accepted Answer · 2012-03-13 10:52:51Z

624

Like this

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

answered Mar 13, 2012 at 10:52

zvrba

24.7k3 gold badges57 silver badges66 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Minhas Kamal · Accepted Answer · 2021-01-13 05:09:43Z

80

#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-

answered Mar 6, 2019 at 6:09

Minhas Kamal

22.6k7 gold badges66 silver badges67 bronze badges