GCC says “syntax error before numeric constant” in generated header file from bison

Question

When I compile my .y file with bison parser.y -d -t and then include the parser.tab.h file in my flex file, gcc says \"error: syntax error before numeric constant.\" It\'s r

Answer 1

Presumably BREAK is already defined somewhere in the flex output file, so after the preprocessor runs you are getting a statement like 99 = 258 or something. Try looking at the output of cpp yy.lex.c or gcc -E yy.lex.c. I looked at a flex output file but did not find BREAK anywhere in it, only YY_BREAK.