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Re: Interesting preprocessor code behavior

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Re: Interesting preprocessor code behavior

Subject: Re: Interesting preprocessor code behavior
From: Greg Guerin <email@hidden>
Date: Thu, 3 Jul 2008 10:54:25 -0700

Clark Cox wrote:

#if MY_UNDEFINED_SYMBOL == ONE
...etc...


The OP mentioned the problem was with #elif, which could be significant.

The OP did not mention which version of gcc was used, which could also be significant.

It was also not mentioned what the order of operands for the fail- case was. DEF==UNDEF could differ from UNDEF==DEF (and would be a bug).

FWIW, the classical way to avoid the problem is:
  #if (defined(X) && ...expression involving X...)

  -- GG

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