semantic allows specification of C-preprocessor keywords using the variable semantic-lex-c-preprocessor-symbol-file, which is a list of C/C++ files that contain preprocessor macros. How do I get semantic to reload these files after changing one of them?
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semantic uses the variable semantic-lex-c-preprocessor-symbol-map to store the C preprocessor keywords used by its C lexer. The function semantic-c-reset-preprocessor-symbol-map reconstructs this table using all the various input methods. So, on changing a file listed in semantic-lex-c-preprocessor-symbol-file, run (semantic-c-reset-preprocessor-symbol-map) to load these changes into semantics environment.