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The C Preprocessor

3.9 Macro Pitfalls

In this section we describe some special rules that apply to macros and macro expansion, and point out certain cases in which the rules have counter-intuitive consequences that you must watch out for.

3.9.1 Misnesting
3.9.2 Operator Precedence Problems
3.9.3 Swallowing the Semicolon
3.9.4 Duplication of Side Effects
3.9.5 Self-Referential Macros
3.9.6 Argument Prescan
3.9.7 Newlines in Arguments