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Date: Sun, 7 Oct 2012 16:31:33 +1100 (EST)
From: Bruce Evans <brde@optusnet.com.au>
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To: Marcel Moolenaar <marcel@freebsd.org>
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Cc: svn-src-head@freebsd.org, svn-src-all@freebsd.org,
	src-committers@freebsd.org
Subject: Re: svn commit: r241298 - in head: . gnu/usr.bin/cc/cc_int
 gnu/usr.bin/cc/include kerberos5 kerberos5/tools/asn1_compile
 kerberos5/tools/slc
 lib/clang/include share/mk tools/build/make_check usr.sbin/c...
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On Sat, 6 Oct 2012, Marcel Moolenaar wrote:

> Log:
>  Add support for bmake. This includes:
> ....
> Modified: head/share/mk/bsd.dep.mk
> ==============================================================================
> --- head/share/mk/bsd.dep.mk	Sat Oct  6 19:57:27 2012	(r241297)
> +++ head/share/mk/bsd.dep.mk	Sat Oct  6 20:01:05 2012	(r241298)
> @@ -102,8 +102,8 @@ ${_YC} y.tab.h: ${_YSRC}
> CLEANFILES+= y.tab.c y.tab.h
> .elif !empty(YFLAGS:M-d)
> .for _YH in ${_YC:R}.h
> -.ORDER: ${_YC} ${_YH}
> -${_YC} ${_YH}: ${_YSRC}
> +${_YH}: ${_YC}
> +${_YC}: ${_YSRC}
> 	${YACC} ${YFLAGS} -o ${_YC} ${.ALLSRC}
> SRCS+=	${_YH}
> CLEANFILES+= ${_YH}

This is broken.  Yacc headers don't depend on generated yacc .c files.
Now there is only a null rule to create the headers.  One broken case
is when the header somehow gets deleted.  It bcomes out of date, but
running make to update it only runs the null rule, so it remains
nonexistent.

Bruce