Trying to find where in the C standard it forbids sizeof() in preprocessor #if expressions
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@fanf Why would it? (I've not heard of this prohibition before)
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Replying to @rjek
@rjek @fanf Presumably, simply, sizeof() cannot know during preprocessing.

Nov 17, 2015 ยท 5:04 PM UTC

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Replying to @dsilverstone
@dsilverstone @rjek The way the standard specifies this is that sizeof gets replaced by 0 in a #if expression before it is evaluated.
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@fanf @rjek Heh