opts: Fix up regenerate-opt-urls dependencies

It seems that we currently require
1) enabling at least c,c++,fortran,d in --enable-languages
2) first doing make html
before one can successfully regenerate-opt-urls, otherwise without 2)
one gets
make regenerate-opt-urls
make: *** No rule to make target '/home/jakub/src/gcc/obj12x/gcc/HTML/gcc-15.0.0/gcc/Option-Index.html', needed by 'regenerate-opt-urls'.  Stop.
or say if not configuring d after make html one still gets
make regenerate-opt-urls
make: *** No rule to make target '/home/jakub/src/gcc/obj12x/gcc/HTML/gcc-15.0.0/gdc/Option-Index.html', needed by 'regenerate-opt-urls'.  Stop.

Now, I believe neither 1) nor 2) is really necessary.
The regenerate-opt-urls goal has dependency on 3 Option-Index.html files,
but those files don't have dependencies how to generate them.
make html has dependency on $(HTMLS_BUILD) which adds
$(build_htmldir)/gcc/index.html and lang.html among other things, where
the former actually builds not just index.html but also Option-Index.html
and tons of other files, and lang.html is filled in by configure depending
on configured languages, so sometimes will include gfortran.html and
sometimes d.html.

The following patch adds dependencies of the Option-Index.html on their
corresponding index.html files and that is all that seems to be needed,
make regenerate-opt-urls then works even without prior make html and
even if just a subset of c/c++, fortran and d is enabled.

2024-10-02  Jakub Jelinek  <jakub@redhat.com>

	* Makefile.in ($(OPT_URLS_HTML_DEPS)): Add dependencies of the
	Option-Index.html files on the corresponding index.html files.
	Don't mention the requirement that all languages that have their own
	HTML manuals to be enabled.

diff --git a/gcc/Makefile.in b/gcc/Makefile.in
index 68fda1a75918d90424b05d429e2e0a2e7a3385af..059cf2e8f79f440a8396f7a1acbb1597824876d9 100644 (file)
--- a/gcc/Makefile.in
+++ b/gcc/Makefile.in
@@ -3640,12 +3640,12 @@ $(build_htmldir)/gccinstall/index.html: $(TEXI_GCCINSTALL_FILES)
        $(SHELL) $(srcdir)/doc/install.texi2html
 
 # Regenerate the .opt.urls files from the generated html, and from the .opt
-# files.  Doing so requires all languages that have their own HTML manuals
-# to be enabled.
+# files.
 .PHONY: regenerate-opt-urls
 OPT_URLS_HTML_DEPS = $(build_htmldir)/gcc/Option-Index.html \
        $(build_htmldir)/gdc/Option-Index.html \
        $(build_htmldir)/gfortran/Option-Index.html
+$(OPT_URLS_HTML_DEPS): %/Option-Index.html: %/index.html
 
 regenerate-opt-urls: $(srcdir)/regenerate-opt-urls.py $(OPT_URLS_HTML_DEPS)
        $(srcdir)/regenerate-opt-urls.py $(build_htmldir) $(shell dirname $(srcdir))