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cf8bb19a11
This error message was missing so that the program would simply segfault if the provided filename could not be opened for some reason. While we're at it, we add explicit support for a filename of "-" to indicate input from stdin. |
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| .. | ||
| tests | ||
| .gitignore | ||
| glcpp-lex.c | ||
| glcpp-lex.l | ||
| glcpp-parse.c | ||
| glcpp-parse.h | ||
| glcpp-parse.y | ||
| glcpp.c | ||
| glcpp.h | ||
| Makefile.am | ||
| pp.c | ||
| README | ||
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 handles according to the GLSL specification and will not appear in the output. Known limitations ----------------- The __LINE__ and __FILE__ macros are not yet supported. 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).