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cxref-cpp - A modified C preprocessor to use with cxref.
To improve the output that is available for the source code for cross-referencing a
modified version of the GNU CPP v2.7.2 is supplied (named cxref-cpp).
This modified C preprocessor allows for a finer control over some features of the
preprocessing that are not important for a compiler. In a standard preprocessor, the
preprocessor directives are intended for use only by the preprocessor, so passing the
information through is not important.
With cxref-cpp, there are some features that are different to the standard GNU CPP:
Compared to gcc versions earlier than version 2.8.0 there is an extra option that
will output the #include lines from the source file. In version 2.8.0 and later
this option is present.
Comments trailing a #include or a #define are not preserved by all versions of gcc
even if the -C option is used. This is not important while compiling, but is
useful for documenting.
The cxref-cpp program will take on the personality of the installed version of gcc
so that the gcc header files can be parsed. This means that it includes the same
default include directory paths and macro definitions. The file that contains
these definitions is called cxref-cpp.defines and is installed by the cxref-cpp-
configure program or specified by the -cxref-cpp-defines command line option.
The same as for gcc, apart from '-cxref-cpp-defines' described above.
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