ref-manual, dev-manual: Added info about make race work-around

I updated both the PARALLEL_MAKE and PARALLEL_MAKEINST variables
by expanding the note to indicate how to prohibit parallel make
threads.  Also, added a cross-referencing link to the
"Debugging Parallel Make Races" section.

I added a short note to the start of the "Debugging Parallel Make
Races" section noting that if they can't properly fix the condition,
they can always do a work-around to set the PARALLEL_MAKE or
PARALLEL_MAKEINST variables to null.

Reported-by: Robert P. J. Day <rpjday@crashcourse.ca>
(From yocto-docs rev: f8dccf3f115647cb039d91415819186cf38fa8bb)

Signed-off-by: Scott Rifenbark <scott.m.rifenbark@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 8 insertions, 0 deletions

diff --git a/documentation/dev-manual/dev-manual-common-tasks.xml b/documentation/dev-manual/dev-manual-common-tasks.xml
index 1d4e34f91e..bab68a1bb9 100644
--- a/documentation/dev-manual/dev-manual-common-tasks.xml
+++ b/documentation/dev-manual/dev-manual-common-tasks.xml
@@ -9089,6 +9089,14 @@
             you debug and fix them.
             This section presents a real-world example of an error encountered
             on the Yocto Project autobuilder and the process used to fix it.
+            <note>
+                If you cannot properly fix a <filename>make</filename> race
+                condition, you can work around it by clearing either the
+                <ulink url='&YOCTO_DOCS_REF_URL;#var-PARALLEL_MAKE'><filename>PARALLEL_MAKE</filename></ulink>
+                or
+                <ulink url='&YOCTO_DOCS_REF_URL;#var-PARALLEL_MAKEINST'><filename>PARALLEL_MAKEINST</filename></ulink>
+                variables.
+            </note>
         </para>
 
         <section id='the-failure'>