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GNU Info (cppinternals-300.info)TopCpplib--the core of the GNU C Preprocessor ****************************************** The GNU C preprocessor in GCC 3.0 has been completely rewritten. It is now implemented as a library, cpplib, so it can be easily shared between a stand-alone preprocessor, and a preprocessor integrated with the C, C++ and Objective-C front ends. It is also available for use by other programs, though this is not recommended as its exposed interface has not yet reached a point of reasonable stability. This library has been written to be re-entrant, so that it can be used to preprocess many files simultaneously if necessary. It has also been written with the preprocessing token as the fundamental unit; the preprocessor in previous versions of GCC would operate on text strings as the fundamental unit. This brief manual documents some of the internals of cpplib, and a few tricky issues encountered. It also describes certain behaviour we would like to preserve, such as the format and spacing of its output. Identifiers, macro expansion, hash nodes, lexing.
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