Typedef issue with bison and flex - c

Question

In my parser, I have
%union {
SYMTABLE *p_entry ;
QUAD *p_quad ;
} ;
Now, SYMTABLE is the typedef for a struct. The struct and typedef are in an included file. There are no issues with this.
QUAD is the typedef for a struct (typedef struct quad QUAD). The struct and typedef are in an included file.
There is no problem doing:
bison -d parser.y
gcc parser.tab.c -c
My lexer needs yylval, so in the declarations part I have
#include "parser.tab.h" /* bison generated header file */
extern YYSTYPE yylval ;
When I do
flex scanner.lex
gcc lex.yy.c -c
GCC complains
In file included from scanner.lex:16:
parser.y:30: error: syntax error before "QUAD"
parser.y:30: warning: no semicolon at end of struct or union
parser.y:32: error: syntax error before '}' token
parser.y:32: warning: data definition has no type or storage class
parser.tab.h:121: error: syntax error before "yylval"
parser.tab.h:121: warning: data definition has no type or storage class
If I go back to my parser.y file and replace QUAD with struct quad in ONLY the yylval %union, the problem goes away. I want to say this is a silly typedef mistake, but the bison generated file compiles just fine. I have included the header file for my QUAD typedef and struct quad in my scanner.
It seems this is the only place where the issues occurs, so I could just replace QUAD with struct quad, but this is inconsistent with the SYMTABLE.

Answer 1

my test.l:
%{
#include "bla.h"
#include "test.tab.h" /* bison generated header file */
extern YYSTYPE yylval ;
%}
%%
\n printf("nl");
. printf("c");
%%
my test.y:
%{
#include "bla.h"
%}
%union {
SYMTABLE *p_entry ;
QUAD *p_quad ;
};
%%
input:
| input;
%%
my bla.h:
typedef void *SYMTABLE;
typedef void *QUAD;
my build:
freundt#segen:pts/21:~/temp> bison -d test.y
test.y: conflicts: 1 shift/reduce
test.y:13.3-7: warning: rule useless in parser due to conflicts: input: input
freundt#segen:pts/21:~/temp> flex test.l
freundt#segen:pts/21:~/temp> icc lex.yy.c -c
freundt#segen:pts/21:~/temp>