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glcpp -- GLSL "C" preprocessor

This is a simple preprocessor designed to provide the preprocessing
needs of the GLSL language. The requirements for this preprocessor are
specified in the GLSL 1.30 specification availble from:

http://www.opengl.org/registry/doc/GLSLangSpec.Full.1.30.10.pdf

This specification is not precise on some semantics, (for example,
#define and #if), defining these merely "as is standard for C++
preprocessors". To fill in these details, I've been using a draft of
the C99 standard as available from:

http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1256.pdf

Any downstream compiler accepting output from glcpp should be prepared
to encounter and deal with the following preprocessor macros:

	#line
	#pragma
	#extension

All other macros will be handled according to the GLSL specification
and will not appear in the output.

Known limitations
-----------------
A file that ends with a function-like macro name as the last
non-whitespace token will result in a parse error, (where it should be
passed through as is).

 Name                                                                             Last modified      Size  
 Parent Directory                                                                                      -   
 CVS/                                                                             19-Mar-2020 23:41    -   
 tests/                                                                           19-Mar-2020 23:39    -   
 README                                                                           08-Mar-2019 11:19  1.0K  
 glcpp-lex.c                                                                      08-Mar-2019 11:19   82K  
 glcpp-lex.l                                                                      08-Mar-2019 11:19   15K  
 glcpp-parse.c                                                                    08-Mar-2019 11:19  145K  
 glcpp-parse.h                                                                    08-Mar-2019 11:19  3.0K  
 glcpp-parse.y                                                                    08-Mar-2019 11:19   64K  
 glcpp.c                                                                          08-Mar-2019 11:19  4.3K  
 glcpp.h                                                                          08-Mar-2019 11:19  5.8K  
 pp.c                                                                             08-Mar-2019 11:19  6.7K  

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