bison -d generates bad header?

[Matt Miller <mmiller@tigris.netnet.net>]

I'm learning bison and flex, and I'm trying to modify the calculator
example in the bison tutorial to use a flex-generated scanner.  Here's the
contents of my compilation buffer:

    cd ~/calc/
    make -k
    bison calc.y
    gcc -c calc.tab.c
    bison -d calc.y
    flex calc.lex.y
    gcc -c lex.yy.c
    In file included from calc.lex.y:2:
    calc.tab.h:4: parse error before `symrec'
    calc.tab.h:4: warning: no semicolon at end of struct or union
    calc.tab.h:5: warning: data definition has no type or storage class

There are more errors, but you get the point.

Heres the output of bison -d:

    $ cat calc.tab.h
    typedef union
    {
      double val;
      symrec *tptr;
    } YYSTYPE;
    #define NUM     258
    #define VAR     259
    #define FNCT    260
    #define NEG     261


    extern YYSTYPE yylval;

I searched the bug list and found only unrelated bison problems.  I
searched the debian-user archives and found an apparently unresolved
thread from July 20, 1997, entitled "Q: gcc and flex/bison ?".  I searched
the GNU help-bison archives and found it very annoying that the messages
can not be sorted by thread.

Thanks,

Matt Miller
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"You can't have everything.  Where would you put it?"