[yocto] why do numerous .bb files set "PARALLEL_MAKE"?

[Gary Thomas]

On 2011-11-04 09:57, Robert P. J. Day wrote:
>
>    stumbled over this so i did a more thorough search:
>
> $ grep -w PARALLEL_MAKE $(find . -name *.bb)
> ./meta/recipes-qt/qt-apps/qmmp_0.5.1.bb:PARALLEL_MAKE = ""
> ./meta/recipes-core/eggdbus/eggdbus_0.6.bb:PARALLEL_MAKE = ""
> ./meta/recipes-core/gettext/gettext_0.16.1.bb:PARALLEL_MAKE = ""
> ./meta/recipes-core/gettext/gettext_0.18.1.1.bb:#PARALLEL_MAKE = ""
> ./meta/recipes-bsp/pciutils/pciutils_3.1.7.bb:PARALLEL_MAKE = ""
> ./meta/recipes-extended/sat-solver/sat-solver_git.bb:PARALLEL_MAKE=""
> ./meta/recipes-extended/bash/bash_3.2.48.bb:PARALLEL_MAKE = ""
> ./meta/recipes-extended/tcp-wrappers/tcp-wrappers_7.6.bb:PARALLEL_MAKE = ""
> ./meta/recipes-extended/groff/groff_1.20.1.bb:PARALLEL_MAKE = ""
> ... more snipped ...
>
>    why are individual recipes setting PARALLEL_MAKE to the empty
> string?  it's a *build* option, why would it have any relevance to
> individual .bb files?

These recipes don't support random ordering of some operations, thus
they are forcing make to run single-threaded.

>
>    conversely, i don't see a single .bb file that sets
> BB_NUMBER_THREADS.  the above just looks ... odd.

I think that setting this variable in a recipe would not have any effect.

-- 
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Gary Thomas                 |  Consulting for the
MLB Associates              |    Embedded world
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