Wen Yi <chux...@outlook.com> writes: > When I use the yacc & lex to compile,
> yacc -d 1-3.y
> lex 1-3.l
> gcc 1-3.tab.c lex.yy.c
> /usr/bin/ld: /tmp/ccYqqE5N.o:(.bss+0x28): multiple definition of `yylval';
> /tmp/ccdJ12gy.o:(.bss+0x4): first defined here
Bison provides the declaration of yylval; don't add one yourself.
BTW, this isn't right:
#define YYSTPYE string
first because you misspelled YYSTYPE, and second because you
evidently want yylval to be double not a string.
regards, tom lane
