[PATCH] doc: use separate doctrees for distinct builders

[Tomi Ollila]

On Fri, May 31 2019, David Bremner wrote:

> It seems our previous attempt with order-only targets was not
> sufficient to avoid problems with sphinx-builds doctree cache [0].
> Looking around at other people's approaches [1], using seperate

probably good, but you may want to s/seperate/separate/

Tomi

> doctrees was suggested. I guess there might be a slight loss of
> efficiency, but it seems more robust.
>
> [0]: build failures were first noticed in debian experimental, but I was able to duplicate it in
>      my usual build environment about 1 in 8 builds.
>
> [1]: in particular
>      https://salsa.debian.org/mpd-team/mpc/commit/9e3fc1657d043d75755993846c93f7700b97f907
> ---
>  doc/Makefile.local | 16 ++++------------
>  1 file changed, 4 insertions(+), 12 deletions(-)
>
> diff --git a/doc/Makefile.local b/doc/Makefile.local
> index 651168f4..719172fe 100644
> --- a/doc/Makefile.local
> +++ b/doc/Makefile.local
> @@ -8,7 +8,7 @@ SPHINXBUILD   = HAVE_EMACS=${HAVE_EMACS} sphinx-build
>  DOCBUILDDIR      := $(dir)/_build
>  
>  # Internal variables.
> -ALLSPHINXOPTS   := -d $(DOCBUILDDIR)/doctrees $(SPHINXOPTS) $(srcdir)/$(dir)
> +ALLSPHINXOPTS   := $(SPHINXOPTS) $(srcdir)/$(dir)
>  APIMAN		:= $(DOCBUILDDIR)/man/man3/notmuch.3
>  DOXYFILE	:= $(srcdir)/$(dir)/doxygen.cfg
>  
> @@ -42,24 +42,16 @@ ifeq ($(WITH_EMACS),1)
>  $(DOCBUILDDIR)/.roff.stamp sphinx-html sphinx-texinfo: docstring.stamp
>  endif
>  
> -# Sequentialize the calls to sphinx-build to avoid races with
> -# reading/writing cached state. This uses GNU make specific
> -# "order-only" prerequisites.
> -
> -sphinx-html: | $(DOCBUILDDIR)/.roff.stamp
> -sphinx-texinfo: | sphinx-html
> -sphinx-info: | sphinx-texinfo
> -
>  sphinx-html: $(DOCBUILDDIR)/.html.stamp
>  
>  $(DOCBUILDDIR)/.html.stamp: $(ALL_RST_FILES)
> -	$(SPHINXBUILD) -b html $(ALLSPHINXOPTS) $(DOCBUILDDIR)/html
> +	$(SPHINXBUILD) -b html -d $(DOCBUILDDIR)/html_doctrees $(ALLSPHINXOPTS) $(DOCBUILDDIR)/html
>  	touch $@
>  
>  sphinx-texinfo: $(DOCBUILDDIR)/.texi.stamp
>  
>  $(DOCBUILDDIR)/.texi.stamp: $(ALL_RST_FILES)
> -	$(SPHINXBUILD) -b texinfo $(ALLSPHINXOPTS) $(DOCBUILDDIR)/texinfo
> +	$(SPHINXBUILD) -b texinfo -d $(DOCBUILDDIR)/texinfo_doctrees $(ALLSPHINXOPTS) $(DOCBUILDDIR)/texinfo
>  	touch $@
>  
>  sphinx-info: sphinx-texinfo
> @@ -75,7 +67,7 @@ ${MAN_ROFF_FILES}: $(DOCBUILDDIR)/.roff.stamp
>  # instance of this recipe for each roff file.
>  $(DOCBUILDDIR)/.roff.stamp: ${MAN_RST_FILES}
>  ifeq ($(HAVE_SPHINX),1)
> -	$(SPHINXBUILD) -b man $(ALLSPHINXOPTS) $(DOCBUILDDIR)/man
> +	$(SPHINXBUILD) -b man -d $(DOCBUILDDIR)/man_doctrees $(ALLSPHINXOPTS) $(DOCBUILDDIR)/man
>  	for section in 1 5 7; do \
>  	    mkdir -p $(DOCBUILDDIR)/man/man$${section}; \
>  	    mv $(DOCBUILDDIR)/man/*.$${section} $(DOCBUILDDIR)/man/man$${section}; \
> -- 
> 2.20.1
>
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