From 5472c07a336c429dd5c1a0a86dfc464fbac895d0 Mon Sep 17 00:00:00 2001
From: Wolfram Schneider <wosch@FreeBSD.org>
Date: Tue, 19 Sep 2017 10:03:26 +0000
Subject: [PATCH] Implement workaround for a parallel doc build

$ make p-all

It works for the sub-directories in a given directory.

On a standard quad core machine the build time goes down
from ca. 20min to 5 minutes.

PR: 222322
---
 share/mk/doc.project.mk | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/share/mk/doc.project.mk b/share/mk/doc.project.mk
index 244195bcbc..3d293f5a06 100644
--- a/share/mk/doc.project.mk
+++ b/share/mk/doc.project.mk
@@ -104,3 +104,9 @@ DOC_LOCAL_MK=	${DOC_PREFIX}/${LANGCODE}/share/mk/doc.local.mk
 
 # Subdirectory glue.
 .include "doc.subdir.mk"
+
+# parallel build for target "all"
+NCPU?= 8
+p-all:
+	make -V SUBDIR | sed -E 's/[ ]+$$//' | tr " " "\n" | sed -E 's/^/make -C /' | tr '\n' '\0' | xargs -0 -n1 -P${NCPU} /bin/sh -c
+