On Fri, 12 Jun 1998 22:30:26 -0400 (EDT)  Todd Vierling wrote:

> On Fri, 12 Jun 1998, Craig M. Chase wrote:
> 
> : b) neither YHEADERS nor PARALLEL are set (and files include y.tab.h)
> 
> I wrote the new YHEADER setup, so let me comment a moment.  When doing a
> parallel make, special rules are called that attempt to make up for the
> deficiency in the .y.c rule wrt yacc.  The problem with updating everything
> to use YHEADER is that some source already has the given named .h file as
> something completely different.  Therefore it's necessary to output
> something else, "just in case" there is already a .y.c rule in progress in a
> parallelized make. 
> 
> I've been contemplating a proper fix for this for a while, and my best
> option so far is:
> 
> - if YHEADER is not set, do not build a .h file.
> - if YHEADER is set and YFLAGS contains "-d", use the non-parallel rules.
>   This would create a y.tab.c (changed to basename.c) and a y.tab.h,
>   untouched.
> - if YHEADER is set, build a .h file with the same basename.
> 
> The only change here is to avoid use of the parallelized rules in the one
> case where YFLAGS contains "-d".  Where a y.tab.h is needed, there should
> only be one .y file, so the parallelized rules are unneeded and we can hack
> around them.

Would a solution to this be to have a separate flag to yacc that simply
builds basename.c and (if -d is given) basename.y, without worring about
the y.tab.? guff?

Simon.