docs: manpage XML depends on asciidoc.conf

When building manual pages, the source text is transformed to XML with
AsciiDoc before the man pages are generated from the XML with xmlto.

Fix the dependencies in the Makefile so that the XML files are rebuilt
when asciidoc.conf changes and not just the manual pages from
unchanged XML, and move the dependencies from a recipeless rule to the
rules with commands that use asciidoc.conf to make the dependencies
easier to understand and maintain.

Reported-by: John Keeping <[email protected]>
Signed-off-by: Jonathan Nieder <[email protected]>
Tested-by: John Keeping <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: jrn

Documentation/Makefile

@@ -178,8 +178,6 @@ all: html man
 
 html: $(DOC_HTML)
 
-$(DOC_HTML) $(DOC_MAN1) $(DOC_MAN5) $(DOC_MAN7): asciidoc.conf
-
 man: man1 man5 man7
 man1: $(DOC_MAN1)
 man5: $(DOC_MAN5)
@@ -257,7 +255,7 @@ clean:
 	$(RM) $(cmds_txt) *.made
 	$(RM) manpage-base-url.xsl
 
-$(MAN_HTML): %.html : %.txt
+$(MAN_HTML): %.html : %.txt asciidoc.conf
 	$(QUIET_ASCIIDOC)$(RM) $@+ $@ && \
 	$(ASCIIDOC) -b xhtml11 -d manpage -f asciidoc.conf \
 		$(ASCIIDOC_EXTRA) -agit_version=$(GIT_VERSION) -o $@+ $< && \
@@ -270,7 +268,7 @@ manpage-base-url.xsl: manpage-base-url.xsl.in
 	$(QUIET_XMLTO)$(RM) $@ && \
 	$(XMLTO) -m $(MANPAGE_XSL) $(XMLTO_EXTRA) man $<
 
-%.xml : %.txt
+%.xml : %.txt asciidoc.conf
 	$(QUIET_ASCIIDOC)$(RM) $@+ $@ && \
 	$(ASCIIDOC) -b docbook -d manpage -f asciidoc.conf \
 		$(ASCIIDOC_EXTRA) -agit_version=$(GIT_VERSION) -o $@+ $< && \
@@ -286,7 +284,7 @@ technical/api-index.txt: technical/api-index-skel.txt \
 	$(QUIET_GEN)cd technical && '$(SHELL_PATH_SQ)' ./api-index.sh
 
 technical/%.html: ASCIIDOC_EXTRA += -a git-relative-html-prefix=../
-$(patsubst %,%.html,$(API_DOCS) technical/api-index $(TECH_DOCS)): %.html : %.txt
+$(patsubst %,%.html,$(API_DOCS) technical/api-index $(TECH_DOCS)): %.html : %.txt asciidoc.conf
 	$(QUIET_ASCIIDOC)$(ASCIIDOC) -b xhtml11 -f asciidoc.conf \
 		$(ASCIIDOC_EXTRA) -agit_version=$(GIT_VERSION) $*.txt