[ACCEPTED]-Generating a compiler from lex and yacc grammar-lex
Accepted answer
The version of yacc you are using is producing 11 C code which is invalid for C99.
The code 10 it produces does not include declarations 9 for the functions yylex or yyerror prior 8 to calling them. This is producing the warnings. In 7 the case of yyerror, it is also resulting 6 in an implicit declaration which does not 5 match the later actual definition.
You can 4 get around it by including the following 3 at the top of the .y file:
%{
int yylex();
void yyerror(const char *s);
%}
Or, you can switch 2 to a more modern yacc compiler.
See also 1 this: Simple yacc grammars give an error
Source:
stackoverflow.com
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