[c] Fix for #3601 -- fix parsing of all preprocessor directives #3608
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Jul 27, 2023
…ntlr#3608) * Fix for antlr#3601 * Add test of preprocessor directives.
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This is a fix for #3601.
This PR changes the lexer rules for preprocessing directives to ignore all '#' directives. The rules that were in the grammar were incomplete. The idea of parsing these lines is to get past most errors where people had not performed preprocessing--which is a lot of people. It also is required since the preprocessor added
#linedirectives for the compiler to print out line/column error information. Again, this grammar is designed to be used on code after preprocessing.I also added a test from the GCC testsuit, which contains preprocessor directives, and a couple of macros expanded as to parse.