[dpdk-dev] [PATCH v2] mk: optimize directory dependencies
Olivier Matz
olivier.matz at 6wind.com
Thu Mar 30 14:11:20 CEST 2017
On Thu, 30 Mar 2017 10:27:49 +0100, Ferruh Yigit <ferruh.yigit at intel.com> wrote:
> On 3/30/2017 9:51 AM, Olivier Matz wrote:
> > Hi Ferruh,
> >
> > On Tue, 28 Mar 2017 11:34:35 +0100, Ferruh Yigit <ferruh.yigit at intel.com> wrote:
> >> On 3/24/2017 1:21 PM, Olivier Matz wrote:
> >>> 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>
> >>
> >> <...>
> >>
> >>> DIRS-$(CONFIG_RTE_LIBRTE_PORT) += librte_port
> >>> +DEPDIRS-librte_port := librte_eal librte_mbuf librte_mempool librte_ether
> >>> +DEPDIRS-librte_port += librte_ip_frag librte_sched librte_kni
> >> ^
> >> ---------------------------------------------------------+
> >>
> >> <...>
> >>
> >>> diff --git a/lib/librte_port/Makefile b/lib/librte_port/Makefile
> >>> index 44fa73520..76629a13a 100644
> >>> --- a/lib/librte_port/Makefile
> >>> +++ b/lib/librte_port/Makefile
> >> <...>
> >>> -ifeq ($(CONFIG_RTE_LIBRTE_KNI),y)
> >>> -DEPDIRS-$(CONFIG_RTE_LIBRTE_PORT) += lib/librte_kni
> >>> -endif
> >>
> >> This check needs to be reflected to new method, otherwise causing build
> >> errors for i686 target.
> >>
> >
> > Did you notice an error? I see no error it with:
> >
> > make config T=x86_64-native-linuxapp-gcc
> > sed -i 's,CONFIG_RTE_LIBRTE_KNI=y,# CONFIG_RTE_LIBRTE_KNI is not set,' build/.config
> > make -j8
> >
> >
> > I think it is not a problem, the DEPDIRS-* variable only gives an
> > ordering directive, which should be ok even if kni is not compiled.
>
> Can you please test shared library build, I am getting following error:
>
> == Build lib/librte_port
> LD librte_port.so.3.1
> /usr/bin/ld: cannot find -lrte_kni
> collect2: error: ld returned 1 exit status
> .../mk/rte.lib.mk:127: recipe for target 'librte_port.so.3.1' failed
> make[3]: *** [librte_port.so.3.1] Error 1
> .../mk/rte.subdir.mk:63: recipe for target 'librte_port' failed
>
You're right, it happens because the libray list is built from DEPDIRS.
Thanks for spotting it, I'll check if there are other occurences and send
a fix. The simple way is probably to restore the ifeq(), but I'm wondering
if having: DEPDIRS-$(cond)-$(path) wouldn't be shorter in Makefiles.
Olivier
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