[dpdk-dev] [PATCH v2] mk: optimize directory dependencies

Thomas Monjalon thomas.monjalon at 6wind.com
Mon Mar 27 23:33:37 CEST 2017

2017-03-24 14:21, Olivier Matz:
> Before this patch, the management of dependencies between directories
> had several issues:
> - the generation of .depdirs, done at configuration is slow: it can take
>   more than one minute on some slow targets (usually ~10s on a standard
>   PC without -j).
> - for instance, it is possible to express a dependency like:
>   - app/foo depends on lib/librte_foo
>   - and lib/librte_foo depends on app/bar
>   But this won't work because the directories are traversed with a
>   depth-first algorithm, so we have to choose between doing 'app' before
>   or after 'lib'.
> - the script depdirs-rule.sh is too complex.
> - we cannot use "make -d" for debug, because the output of make is used for
>   the generation of .depdirs.
> This patch moves the DEPDIRS-* variables in the upper Makefile, making
> the dependencies much easier to calculate. A DEPDIRS variable is still
> used to process library dependencies in LDLIBS.
> After this commit, "make config" is almost immediate.
> Signed-off-by: Olivier Matz <olivier.matz at 6wind.com>
> Tested-by: Robin Jarry <robin.jarry at 6wind.com>
> Tested-by: Jerin Jacob <jerin.jacob at caviumnetworks.com>

It is almost impossible to really review such a big change in Makefiles ;)

Fixed a typo in pipeline lib dependency, and
Applied, thanks

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