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A comment on Notes on Programming in C (1989). Parent comment

Re:Notes on Programming in C (1989) by pjmlp on Sunday May 11, 2014 @11:02AM (#7728834)
Not when you #undef it. That was just a possible example.
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Re:Notes on Programming in C (1989) by dllthomas on Sunday May 11, 2014 @12:04PM (#7728988)
If list.h has no include guard, it gets included with or without this optimization. If it has an include guard and you #undef it, then it gets included again with or without this optimization. If you it has an include guard and you do not #undef it, it does not get included again, with or without this optimization.

In no case does this optimization change the code emitted.

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