Follow-up Comment #1, bug #63362 (project make):
I am not sure why things behave differently between -j1 and -j2 I will have to
investigate it. You can more easily determine what is going on if you invoke
make with the `--trace` option.
However, this rule seems wrong and always has been:
%.1 %.5 %.7 : %.xml manpage-base-url.xsl $(wildcard manpage*.xsl)
$(QUIET_XMLTO)$(XMLTO) -m $(MANPAGE_XSL) $(XMLTO_EXTRA) man $<
To make this means that one invocation of that recipe for a file xyz.xml will
build ALL the targets xyz.1, xyz.5, and xyz.7. Which, it does not do as best
as I can tell.
Possibly the author of the makefile thought that the above command is
equivalent to writing this:
%.1 : %.xml manpage-base-url.xsl $(wildcard manpage*.xsl)
$(QUIET_XMLTO)$(XMLTO) -m $(MANPAGE_XSL) $(XMLTO_EXTRA) man $<
%.5 : %.xml manpage-base-url.xsl $(wildcard manpage*.xsl)
$(QUIET_XMLTO)$(XMLTO) -m $(MANPAGE_XSL) $(XMLTO_EXTRA) man $<
%.7 : %.xml manpage-base-url.xsl $(wildcard manpage*.xsl)
$(QUIET_XMLTO)$(XMLTO) -m $(MANPAGE_XSL) $(XMLTO_EXTRA) man $<
but it is not the same thing; if you want three different rules you have to,
unfortunately, write them all out like that. This is why you're seeing that
warning. But I don't know that this has anything to do with why things are
being rebuilt.
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