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The C Preprocessor

11. Implementation Details

Here we document details of how the preprocessor's implementation affects its user-visible behavior. You should try to avoid undue reliance on behavior described here, as it is possible that it will change subtly in future implementations.

Also documented here are obsolete features and changes from previous versions of GNU CPP.

11.1 Implementation-defined behavior
11.2 Implementation limits
11.3 Obsolete Features
11.4 Differences from previous versions