[dpdk-dev] [PATCH 03/11] mk: fix build dependency of drivers on pmdinfogen
Neil Horman
nhorman at tuxdriver.com
Thu Jul 7 19:44:58 CEST 2016
On Thu, Jul 07, 2016 at 06:21:49PM +0200, Thomas Monjalon wrote:
> 2016-07-07 11:56, Neil Horman:
> > On Thu, Jul 07, 2016 at 05:36:22PM +0200, Thomas Monjalon wrote:
> > > When compiling the drivers, some code is generated with pmdinfogen.
> > > A fresh parallel build can fail if a driver is compiled before pmdinfogen:
> > > build/buildtools/dpdk-pmdinfogen: Permission denied
> > >
> > > There was a dependency declared in drivers/Makefile but it cannot work
> > > because this file is based on mk/rte.subdir.mk which do not handle
> > > dependencies.
> > >
> > > It is fixed by declaring the whole buildtools as (order only) prerequisite
> > > of drivers.
> [...]
> > > --- a/drivers/Makefile
> > > +++ b/drivers/Makefile
> > > @@ -34,6 +34,4 @@ include $(RTE_SDK)/mk/rte.vars.mk
> > > DIRS-y += net
> > > DIRS-$(CONFIG_RTE_LIBRTE_CRYPTODEV) += crypto
> > >
> > > -DEPDIRS-y += buildtools/pmdinfo
> > > -
> > > include $(RTE_SDK)/mk/rte.subdir.mk
> > > diff --git a/mk/rte.sdkbuild.mk b/mk/rte.sdkbuild.mk
> > > index fb68af2..354f006 100644
> > > --- a/mk/rte.sdkbuild.mk
> > > +++ b/mk/rte.sdkbuild.mk
> > > @@ -49,6 +49,7 @@ $(1): $(sort $(LOCAL_DEPDIRS-$(1)))
> > > endef
> > >
> > > $(foreach d,$(ROOTDIRS-y),$(eval $(call depdirs_rule,$(d))))
> > > +drivers: | buildtools
> > >
> > I'm not sure i understand the reasoning here, DEPDIRS is meant to declare
> > prerequisites to a directory (and its children) getting built, right? A
> > parallel make should block any drivers getting built prior to pmdinfogen getting
> > built. What am I missing?
>
> DEPDIRS-y is not parsed at all in the context of rte.subdir.mk.
> That's why this line was ignored by the build system.
>
Ah, ok then (though it seems like that might be a useful variable to query,
rather than dead reconing it inside the sdk build file
Acked-by: Neil Horman <nhorman at tuxdriver.com>
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