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ref-manual: Edits to PARALLEL_MAKE variable. 

Added a note indicating that the variable might be cleared out
if there are problems running Make.

(From yocto-docs rev: 861921b86c48de2267ccd32ab3f3424a98eb8ed1)

Signed-off-by: Scott Rifenbark <scott.m.rifenbark@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Scott Rifenbark 2013-09-23 10:21:59 -07:00 committed by Richard Purdie
parent 45ace75bbf
commit 0f902628fa
1 changed files with 15 additions and 5 deletions
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20
documentation/ref-manual/ref-variables.xml
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@ -3751,14 +3751,24 @@ recipes-graphics/xorg-font/font-alias_1.0.3.bb:PR = "${INC_PR}.3"
<glossentry id='var-PARALLEL_MAKE'><glossterm>PARALLEL_MAKE</glossterm>
<glossdef>
<para>Extra options that are passed to the
<para>
Extra options that are passed to the
<filename>make</filename> command during the
<filename>do_compile</filename> task in order to specify
parallel compilation.
This variable is usually in the form <filename>-j 4</filename>, where the number
represents the maximum number of parallel threads make can run.
If you development host supports multiple cores a good rule of thumb is to set
this variable to twice the number of cores on the host.</para>
This variable is usually in the form
<filename>-j 4</filename>, where the number
represents the maximum number of parallel threads make can
run.
If you development host supports multiple cores a good
rule of thumb is to set this variable to twice the number
of cores on the host.
<note>
Individual recipes might clear out this variable if
the software being built has problems running its
<filename>make</filename> process in parallel.
</note>
</para>
</glossdef>
</glossentry>