gnupic: Thread: A question about parse.y

When I using bison compile the parse.y(gputils-0.14.2/gpasm/parse.y) to get
the parse.c.
Using this directive bison -d -vt parse.y in terminal, And I get this
output --- conflicts : 26 shift/reduce.

Is it normal..??
I'm not familiar with bison..

Thanks..

Thanks..
It's can work,I have compile the parse.y(modified to satisfy my
requirement).everything is OK, except that the .lst file have
some duplicate information root in the included header file..
:-)


2012/8/24 Joe Pfeiffer ####@####.####

> feqin fan writes:
> >When I using bison compile the parse.y(gputils-0.14.2/gpasm/parse.y) to
> get
> >the parse.c.
> >Using this directive bison -d -vt parse.y in terminal, And I get this
> >output --- conflicts : 26 shift/reduce.
> >
> >Is it normal..??
> >I'm not familiar with bison..
>
> Yes, it's normal; it happens when a grammar is ambiguous.  I haven't
> looked at it in detail to know whether there is actually a problem or
> if the author just wasn't careful, but if it works you can assume it's
> correct "enough".
> --
> Joe Pfeiffer                                   http://pfeifferfamily.net/
> 1440 Tierra del Sol Dr                         575.525.2764 (H)
> Las Cruces, NM 88007                           575.496.3501 (C)
>
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>

Hi,

> > Using this directive bison -d -vt parse.y in terminal, And I get
> > this output --- conflicts : 26 shift/reduce.
> 
> Yes, it's normal; it happens when a grammar is ambiguous.

I too don't know the specifics of this case but assuming each of the 26
is happy with bison's default action and that the grammar can't be
easily re-worked to lessen them then bison has a %expect directive so 26
can be stated removing the warning unless it deviates in the future.

    http://www.gnu.org/software/bison/manual/html_node/Expect-Decl.html

Cheers, Ralph.