From c94d6e0944ed7dda861829349b72d2a60fdcd098 Mon Sep 17 00:00:00 2001
From: Tomi Ollila <tomi.ollila@iki.fi>
Date: Fri, 18 Apr 2014 10:13:23 +0300
Subject: [PATCH] Re: [PATCH] doc: Fix parallel build of roff files

---
 50/cf328889383d322d8dedd7e5e3269405520033 | 107 ++++++++++++++++++++++
 1 file changed, 107 insertions(+)
 create mode 100644 50/cf328889383d322d8dedd7e5e3269405520033

diff --git a/50/cf328889383d322d8dedd7e5e3269405520033 b/50/cf328889383d322d8dedd7e5e3269405520033
new file mode 100644
index 000000000..b1bca340c
--- /dev/null
+++ b/50/cf328889383d322d8dedd7e5e3269405520033
@@ -0,0 +1,107 @@
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+From: Tomi Ollila <tomi.ollila@iki.fi>
+To: Austin Clements <amdragon@MIT.EDU>, notmuch@notmuchmail.org
+Subject: Re: [PATCH] doc: Fix parallel build of roff files
+In-Reply-To: <1397766897-14475-1-git-send-email-amdragon@mit.edu>
+References: <1397766897-14475-1-git-send-email-amdragon@mit.edu>
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+Date: Fri, 18 Apr 2014 10:13:23 +0300
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+
+On Thu, Apr 17 2014, Austin Clements <amdragon@MIT.EDU> wrote:
+
+> The roff build rule builds all of the roff files in a single command.
+> Previously, this was expressed as a multi-target rule, but since this
+> is equivalent to specifying a copy of the rule for each target, make
+> -jN could start up to N parallel instances of this command.  Fix this
+> by bottlenecking this rule through a single stamp file.
+>
+> This also removes the unused man.stamp from CLEAN.
+> ---
+>  doc/Makefile.local | 11 +++++++++--
+>  1 file changed, 9 insertions(+), 2 deletions(-)
+>
+> diff --git a/doc/Makefile.local b/doc/Makefile.local
+> index 0980c71..5cf140d 100644
+> --- a/doc/Makefile.local
+> +++ b/doc/Makefile.local
+> @@ -35,7 +35,13 @@ MAN_GZIP_FILES := $(addsuffix .gz,${MAN_ROFF_FILES})
+>  
+>  # Use the man page converter that is available. We should never depend
+>  # on MAN_ROFF_FILES if a converter is not available.
+> -${MAN_ROFF_FILES}: ${MAN_RST_FILES}
+> +${MAN_ROFF_FILES}: $(DOCBUILDDIR)/.roff.stamp
+> +
+> +# By using $(DOCBUILDDIR)/roff.stamp instead of ${MAN_ROFF_FILES}, we
+> +# convey to make that a single invocation of this receipe builds all
+
+LGTM. This 'receipe' could be amended to recipe(?:)
+
+> +# of the roff files.  This prevents parallel make from starting an
+> +# instance of this recipe for each roff file.
+> +$(DOCBUILDDIR)/.roff.stamp: ${MAN_RST_FILES}
+>  ifeq ($(HAVE_SPHINX),1)
+>  	$(SPHINXBUILD) -b man $(ALLSPHINXOPTS) $(DOCBUILDDIR)/man
+>  	for section in 1 5 7; do \
+> @@ -48,6 +54,7 @@ else
+>  	@echo "Fatal: build dependency fail."
+>  	@false
+>  endif
+> +	touch ${MAN_ROFF_FILES} $@
+>  
+>  # Do not try to build or install man pages if a man page converter is
+>  # not available.
+> @@ -70,5 +77,5 @@ endif
+>  $(dir)/docdeps.mk: $(dir)/conf.py $(dir)/mkdocdeps.py
+>  	$(mkdocdeps) $(srcdir)/doc $(DOCBUILDDIR) $@
+>  
+> -CLEAN := $(CLEAN) $(DOCBUILDDIR) $(dir)/docdeps.mk $(dir)/man.stamp
+> +CLEAN := $(CLEAN) $(DOCBUILDDIR) $(dir)/docdeps.mk $(DOCBUILDDIR)/.roff.stamp
+>  CLEAN := $(CLEAN) $(MAN_GZIP_FILES) $(MAN_ROFF_FILES)
+> -- 
+> 1.9.1
+>
+> _______________________________________________
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-- 
2.26.2