From mboxrd@z Thu Jan  1 00:00:00 1970
Message-ID: <97cf6a6e603204e68ecb28ccf32cefa3@vitanuova.com>
To: 9fans@cse.psu.edu
Date: Fri, 15 Oct 2004 23:23:48 +0100
From: rog@vitanuova.com
In-Reply-To: <fc8f4c2c061263e93ed354e399b8db80@plan9.ucalgary.ca>
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Subject: [9fans] mk question
Topicbox-Message-UUID: ef1ddd1c-eacd-11e9-9e20-41e7f4b1d025

i'm sure i'm being stupid here, but i can't see how i should solve
this problem.

i've got build tree which holds (amongst other things) a program to be
compiled, which when run processes a data file to produce several
source code and some header files as output, which must in turn be
compiled.

i'd like to express these dependencies in a mkfile.

i've written a mkfile that looks like this:

	# mktypeset produces four output files from a .typeset file.
	%.b %.m %types.b %types.m: %.typeset
		mktypeset $stem.typeset

	# limbo compiles a .b into a .dis
	%.dis: %.b
		limbo -gw $stem.b

	# specify three current .typeset files.
	TYPESETS=abc grid fs

	DISFILES=${TYPESETS:%=%.dis} ${TYPESETS:%=%types.dis} 

	# all dis files (apart from mktypeset.dis) depend on the header files
	$DISFILES: ${TYPESETS:%=%.m} ${TYPESETS:%=%types.m}

	all:V: $DISFILES mktypeset.dis


however, this doesn't express the dependency that mktypeset.dis needs
to be built before running it.

if i change the first rule to:

	%.b %.m %types.b %types.m: %.typeset mktypeset.dis
		mktypeset $stem.typeset

then i get:

	mk: cycle in graph detected at target mktypeset.dis

any ideas?