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(cpp-300.info)Implementation Details

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Implementation Details
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   Here we document details of how the preprocessor's implementation
affects its user-visible behavior.  You should try to avoid undue
reliance on behaviour 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.

Implementation-defined behavior

Implementation limits

Obsolete Features

Differences from previous versions