linux-kernel - [RFC patch] Documenation: don't build media .rst files when not building Documentation/media/

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Date:   Sat, 28 Apr 2018 18:56:51 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     linux-kbuild <linux-kbuild@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>
Subject: [RFC patch] Documenation: don't build media .rst files when not
 building Documentation/media/


Don't build media .rst files from header files when Documentation/media/
is not in the target SPHINXDIRS.

It looks like the dependencies in Documentation/media/Makefile should
take care of running parse-headers.pl to generated .rst files from the
header files, but it's not happening and I don't see why not.

---
 Documentation/Makefile |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- linux-next-20180426.orig/Documentation/Makefile
+++ linux-next-20180426/Documentation/Makefile
@@ -52,8 +52,7 @@ loop_cmd = $(echo-cmd) $(cmd_$(1)) || ex
 #    e.g. "media" for the linux-tv book-set at ./Documentation/media
 
 quiet_cmd_sphinx = SPHINX  $@ --> file://$(abspath $(BUILDDIR)/$3/$4)
-      cmd_sphinx = $(MAKE) BUILDDIR=$(abspath $(BUILDDIR)) $(build)=Documentation/media $2 && \
-	PYTHONDONTWRITEBYTECODE=1 \
+      cmd_sphinx = PYTHONDONTWRITEBYTECODE=1 \
 	BUILDDIR=$(abspath $(BUILDDIR)) SPHINX_CONF=$(abspath $(srctree)/$(src)/$5/$(SPHINX_CONF)) \
 	$(SPHINXBUILD) \
 	-b $2 \