Re: YYSTYPE_IS_TRIVIAL

[Paul Eggert]

> From: Akim Demaille <address@hidden>
> Date: 24 Apr 2002 13:44:17 +0200
> 
> Hm, there must be something I don't understand here.  Do we agree that
> the definition of being trivial, for yystype, is strictly when %union
> is used?

No, it also depends on whether C++ is being used.  The types are
always trivial for C.

> So my suggestion is that reader.c:prepare does something like
> 
> MUSCLE_INSERT_INT ("stype_is_trivial", typed);

OK.  But now I see that there already is a MUSCLE_INSERT_INT
("stype_line", lineno); in the case where `typed' is nonzero.  So
perhaps I could leave reader.c alone, and use `YYSTYPE_LINE' instead
of `YYSTYPE_IS_TRIVIAL'.

I'll stop here for now, as I'm still not sure I'm building CVS Bison
correctly.  I typically use the Bash grammar as a test case, and the
Bison that I build does not handle the Bash 2.05a grammar correctly:

  $ bison -y -d parse.y
  conflicts:  1 shift/reduce
  /tmp/bsng.aiDD:2537: /opt/sfw/bin/gm4: Warning: Excess arguments to built-in 
`m4_define' ignored

Is there some way to tell Bison to output the m4 input instead of the
m4 output, for debugging purposes?  If not, perhaps there should be.