[Ada] doc/Makefile: automatically create doc/share/_static

2019-08-21  Joel Brobecker  <brobecker@adacore.com>

gcc/ada/

	* doc/Makefile (mk_empty_dirs): New (PHONY) rule.
	(%.html, %.pdf, %.txt, %.info, %.texinfo): Add dependencies on
	mk_empty_dirs.

From-SVN: r274775

gcc/ada/ChangeLog

+2019-08-21  Joel Brobecker  <brobecker@adacore.com>
+
+	* doc/Makefile (mk_empty_dirs): New (PHONY) rule.
+	(%.html, %.pdf, %.txt, %.info, %.texinfo): Add dependencies on
+	mk_empty_dirs.
+
 2019-08-21  Justin Squirek  <squirek@adacore.com>
 
 	* doc/gnat_rm/implementation_defined_pragmas.rst: Modify

gcc/ada/doc/Makefile

@@ -42,22 +42,26 @@ help:
 clean:
 	-rm -rf $(BUILDDIR)
 
-%.html:
+.PHONY: mk_empty_dirs
+mk_empty_dirs:
+	mkdir -p share/_static
+
+%.html: mk_empty_dirs
 	$(SPHINXBUILD) -b html $(ALLSPHINXOPTS) $(BUILDDIR)/$*/html
 
-%.pdf:
+%.pdf: mk_empty_dirs
 	$(SPHINXBUILD) -b latex $(ALLSPHINXOPTS) $(BUILDDIR)/$*/pdf
 	$(MAKE) -C $(BUILDDIR)/$*/pdf all-pdf LATEXOPTS="-interaction=nonstopmode"
 
-%.txt:
+%.txt: mk_empty_dirs
 	$(SPHINXBUILD) -b texinfo $(ALLSPHINXOPTS) $(BUILDDIR)/$*/txt
 	$(MAKE) -C $(BUILDDIR)/$*/txt plaintext
 
-%.info:
+%.info: mk_empty_dirs
 	$(SPHINXBUILD) -b texinfo $(ALLSPHINXOPTS) $(BUILDDIR)/$*/info
 	$(MAKE) -C $(BUILDDIR)/$*/info info
 
-%.texinfo:
+%.texinfo: mk_empty_dirs
 	$(SPHINXBUILD) -b texinfo $(ALLSPHINXOPTS) $(BUILDDIR)/$*/texinfo
 	sed -e 's/^@dircategory/@dircategory GNU Ada Tools/g' < $(BUILDDIR)/$*/texinfo/$*.texi > $(BUILDDIR)/../../$*.texi