[Qemu-devel] [PATCH 09/11] Makefile, configure: Support building rST documentation

[Peter Maydell]

Add support to our configure and makefile machinery for building
our rST docs into HTML files.

Building the documentation now requires that sphinx-build is
available; this seems better than allowing half the docs to
be built if it is not present but having half of them missing.
(In particular it means that assuming that distros configured with
--enable-docs they'll get a helpful error from configure telling
them the new build dependency.)

Signed-off-by: Peter Maydell <address@hidden>
---
 configure |  4 ++--
 Makefile  | 45 ++++++++++++++++++++++++++++++++++++++++++---
 2 files changed, 44 insertions(+), 5 deletions(-)

diff --git a/configure b/configure
index b18281c61f3..9cd5c0cd0bd 100755
--- a/configure
+++ b/configure
@@ -4561,11 +4561,11 @@ fi
 
 # Check if tools are available to build documentation.
 if test "$docs" != "no" ; then
-  if has makeinfo && has pod2man; then
+  if has makeinfo && has pod2man && has sphinx-build; then
     docs=yes
   else
     if test "$docs" = "yes" ; then
-      feature_not_found "docs" "Install texinfo and Perl/perl-podlators"
+      feature_not_found "docs" "Install texinfo, Perl/perl-podlators and 
python-sphinx"
     fi
     docs=no
   fi
diff --git a/Makefile b/Makefile
index 1278a3eb529..d519fadee39 100644
--- a/Makefile
+++ b/Makefile
@@ -387,7 +387,7 @@ dummy := $(call unnest-vars,, \
 
 include $(SRC_PATH)/tests/Makefile.include
 
-all: $(DOCS) $(TOOLS) $(HELPERS-y) recurse-all modules
+all: $(DOCS) sphinxdocs $(TOOLS) $(HELPERS-y) recurse-all modules
 
 qemu-version.h: FORCE
        $(call quiet-command, \
@@ -631,6 +631,14 @@ dist: qemu-$(VERSION).tar.bz2
 qemu-%.tar.bz2:
        $(SRC_PATH)/scripts/make-release "$(SRC_PATH)" "$(patsubst 
qemu-%.tar.bz2,%,$@)"
 
+# Note that these commands assume that there are no HTML files in
+# the docs subdir in the source tree! If there are then this will
+# blow them away for an in-source-tree 'make clean'.
+define clean-manual =
+rm -rf docs/$1/_static
+rm docs/$1/objects.inv docs/$1/searchindex.js docs/$1/*.html
+endef
+
 distclean: clean
        rm -f config-host.mak config-host.h* config-host.ld $(DOCS) 
qemu-options.texi qemu-img-cmds.texi qemu-monitor.texi qemu-monitor-info.texi
        rm -f config-all-devices.mak config-all-disas.mak config.status
@@ -651,6 +659,9 @@ distclean: clean
        rm -f docs/interop/qemu-qmp-ref.html docs/interop/qemu-ga-ref.html
        rm -f docs/qemu-block-drivers.7
        rm -f docs/qemu-cpu-models.7
+       rm -f .doctrees
+       $(call clean-manual,devel)
+       $(call clean-manual,interop)
        for d in $(TARGET_DIRS); do \
        rm -rf $$d || exit 1 ; \
         done
@@ -684,7 +695,18 @@ else
 BLOBS=
 endif
 
-install-doc: $(DOCS)
+define install-manual =
+for d in $$(cd docs && find $1 -type d); do $(INSTALL_DIR) 
"$(DESTDIR)$(qemu_docdir)/$$d"; done
+for f in $$(cd docs && find $1 -type f); do $(INSTALL_DATA) "docs/$$f" 
"$(DESTDIR)$(qemu_docdir)/$$f"; done
+endef
+
+# Note that we deliberately do not install the "devel" manual: it is
+# for QEMU developers, and not interesting to our users.
+.PHONY: install-sphinxdocs
+install-sphinxdocs: sphinxdocs
+       $(call install-manual,interop)
+
+install-doc: $(DOCS) install-sphinxdocs
        $(INSTALL_DIR) "$(DESTDIR)$(qemu_docdir)"
        $(INSTALL_DATA) qemu-doc.html "$(DESTDIR)$(qemu_docdir)"
        $(INSTALL_DATA) qemu-doc.txt "$(DESTDIR)$(qemu_docdir)"
@@ -835,6 +857,23 @@ docs/version.texi: $(SRC_PATH)/VERSION
 %.pdf: %.texi docs/version.texi
        $(call quiet-command,texi2pdf $(TEXI2PDFFLAGS) $< -o $@,"GEN","$@")
 
+# Sphinx builds all its documentation at once in one invocation
+# and handles "don't rebuild things unless necessary" itself.
+# The '.doctrees' files are cached information to speed this up.
+.PHONY: sphinxdocs
+sphinxdocs: docs/devel/index.html docs/interop/index.html
+
+# Canned command to build a single manual
+build-manual = $(call quiet-command,sphinx-build $(if $(V),,-q) -b html -d 
.doctrees/$1 $(SRC_PATH)/docs/$1 docs/$1 ,"SPHINX","docs/$1")
+# We assume all RST files in the manual's directory are used in it
+manual-deps = $(wildcard $(SRC_PATH)/docs/$1/*.rst) 
$(SRC_PATH)/docs/$1/conf.py $(SRC_PATH)/docs/conf.py
+
+docs/devel/index.html: $(call manual-deps,devel)
+       $(call build-manual,devel)
+
+docs/interop/index.html: $(call manual-deps,interop)
+       $(call build-manual,interop)
+
 qemu-options.texi: $(SRC_PATH)/qemu-options.hx $(SRC_PATH)/scripts/hxtool
        $(call quiet-command,sh $(SRC_PATH)/scripts/hxtool -t < $< > 
$@,"GEN","$@")
 
@@ -863,7 +902,7 @@ docs/qemu-block-drivers.7: docs/qemu-block-drivers.texi
 docs/qemu-cpu-models.7: docs/qemu-cpu-models.texi
 scripts/qemu-trace-stap.1: scripts/qemu-trace-stap.texi
 
-html: qemu-doc.html docs/interop/qemu-qmp-ref.html 
docs/interop/qemu-ga-ref.html
+html: qemu-doc.html docs/interop/qemu-qmp-ref.html 
docs/interop/qemu-ga-ref.html sphinxdocs
 info: qemu-doc.info docs/interop/qemu-qmp-ref.info 
docs/interop/qemu-ga-ref.info
 pdf: qemu-doc.pdf docs/interop/qemu-qmp-ref.pdf docs/interop/qemu-ga-ref.pdf
 txt: qemu-doc.txt docs/interop/qemu-qmp-ref.txt docs/interop/qemu-ga-ref.txt
-- 
2.20.1