Improve SGML build rules for non-HTML output, per Peter.

doc/src/sgml/Makefile

@@ -2,7 +2,7 @@
 #
 # PostgreSQL documentation makefile
 #
-# $PostgreSQL: pgsql/doc/src/sgml/Makefile,v 1.89 2007/01/10 01:57:15 momjian Exp $
+# $PostgreSQL: pgsql/doc/src/sgml/Makefile,v 1.90 2007/01/10 19:06:04 momjian Exp $
 #
 #----------------------------------------------------------------------------
 
@@ -89,6 +89,7 @@ all: html
 
 .PHONY: html
 
+# This is run for all output formats because we need bookindex.sgml
 html: postgres.sgml $(ALLSGML) stylesheet.dsl
 	@rm -f *.html
 	$(JADE) $(JADEFLAGS) $(SPFLAGS) $(SGMLINCLUDE) $(CATALOG) -d stylesheet.dsl -i output-html -t sgml $<
@@ -96,35 +97,36 @@ ifeq ($(vpath_build), yes)
 	@cp $(srcdir)/stylesheet.css .
 endif
 ifndef DRAFT
-	@cmp -s HTML.index.start HTML.index || $(MAKE) $(MAKECMDGOALS)
+	@cmp -s HTML.index.start HTML.index || $(MAKE) $@
 endif
 
 
 COLLATEINDEX := LC_ALL=C $(PERL) $(COLLATEINDEX) -f -g
 
+# The draft rule calls $(MAKE) again and sets the DRAFT variable.
+# This seems to be the only way to set gmake variables in a rule.
 draft:
 ifndef DRAFT
 ifneq ($(MAKECMDGOALS), draft)
-# Call ourselves with the DRAFT value set.  This seems to be the only
-# way to set gmake variables in a rule.
 	@$(MAKE) DRAFT="Y" $(MAKECMDGOALS)
 else
-# run default 'all' rule
+# simulate $(MAKE) with no arguments
 	@$(MAKE) DRAFT="Y" all
 endif
 endif
 
+# bookindex.sgml is required so there is a proper index for all output formats
 bookindex.sgml: HTML.index
 # create a dummy bookindex.html
 	test -s HTML.index || $(COLLATEINDEX) -o $@ -N
-# If HTML.index is valid, create a valid bookindex.sgml.  This 
-# is required so the output has a proper index.
+# If HTML.index is valid, create a valid bookindex.sgml.
 	test ! -s HTML.index || $(COLLATEINDEX) -i 'bookindex' -o $@ $<
 # save copy of HTML.index for later comparison
 	@cp HTML.index HTML.index.start
 
+# HTML.index is used to create bookindex.sgml
 HTML.index:
-# create HTML.index if it does not exist
+# create an empty HTML.index if it does not exist
 	@$(if $(wildcard HTML.index), , touch HTML.index)
 
 version.sgml: $(top_builddir)/src/Makefile.global
@@ -156,29 +158,17 @@ features-unsupported.sgml: $(top_srcdir)/src/backend/catalog/sql_feature_package
 
 JADE.tex.call = $(JADE) $(JADEFLAGS) $(SGMLINCLUDE) $(CATALOG) -d $(srcdir)/stylesheet.dsl -t tex -V tex-backend -i output-print
 
-%-A4.tex-ps: %.sgml $(ALLSGML) stylesheet.dsl bookindex.sgml
+%-A4.tex-ps: %.sgml $(ALLSGML) html
 	$(JADE.tex.call) -V texdvi-output -V '%paper-type%'=A4 -o $@ $<
-ifndef DRAFT
-	@cmp -s HTML.index.start HTML.index || $(MAKE) $@
-endif
 
-%-US.tex-ps: %.sgml $(ALLSGML) stylesheet.dsl bookindex.sgml
+%-US.tex-ps: %.sgml $(ALLSGML) html
 	$(JADE.tex.call) -V texdvi-output -V '%paper-type%'=USletter -o $@ $<
-ifndef DRAFT
-	@cmp -s HTML.index.start HTML.index || $(MAKE) $@
-endif
 
-%-A4.tex-pdf: %.sgml $(ALLSGML) stylesheet.dsl bookindex.sgml
+%-A4.tex-pdf: %.sgml $(ALLSGML) html
 	$(JADE.tex.call) -V texpdf-output -V '%paper-type%'=A4 -o $@ $<
-ifndef DRAFT
-	@cmp -s HTML.index.start HTML.index || $(MAKE) $@
-endif
 
-%-US.tex-pdf: %.sgml $(ALLSGML) stylesheet.dsl bookindex.sgml
+%-US.tex-pdf: %.sgml $(ALLSGML) html
 	$(JADE.tex.call) -V texpdf-output -V '%paper-type%'=USletter -o $@ $<
-ifndef DRAFT
-	@cmp -s HTML.index.start HTML.index || $(MAKE) $@
-endif
 
 %.dvi: %.tex-ps
 	@rm -f $*.aux $*.log