Re: [PATCH] app/testpmd: fix static build link ordering

[Jerin Jacob <jerin.jacob@caviumnetworks.com>]

On Fri, Jan 13, 2017 at 03:57:59PM +0000, Ferruh Yigit wrote:
> On 1/13/2017 3:53 PM, Thomas Monjalon wrote:
> > 2017-01-13 08:51, Jerin Jacob:
> >> On Thu, Jan 12, 2017 at 03:27:30PM +0000, Ferruh Yigit wrote:
> >>> On 1/12/2017 1:58 PM, Jerin Jacob wrote:
> >>>> On Thu, Jan 12, 2017 at 10:26:08AM +0100, Thomas Monjalon wrote:
> >>>>> 2017-01-12 13:16, Jerin Jacob:
> >>>>>> +ifeq ($(CONFIG_RTE_BUILD_SHARED_LIB),y)
> >>>>>>  _LDLIBS-$(CONFIG_RTE_LIBRTE_IXGBE_PMD) += -lrte_pmd_ixgbe
> >>>>>> +endif
> >>>>>
> >>>>> _LDLIBS is an internal variable of rte.app.mk.
> >>>>> Please could you check that there is no issue when using LDLIBS instead
> >>>>> of _LDLIBS?
> >>>>
> >> LDLIBS is not helping the situation as LDLIBS comes before the _LDLIBS-y
> >> mk/rte.app.mk:LDLIBS += $(_LDLIBS-y) $(CPU_LDLIBS) $(EXTRA_LDLIBS)
> >>
> >> But moving to EXTRA_LDLIBS looks OK.But it has to be under CONFIG_RTE_LIBRTE_IXGBE_PMD
> >>
> >> Thomas, Ferruh
> >> Let me know if you have any objection on below mentioned diff
> >>
> >> -ifeq ($(CONFIG_RTE_BUILD_SHARED_LIB),y)
> >> -_LDLIBS-$(CONFIG_RTE_LIBRTE_IXGBE_PMD) += -lrte_pmd_ixgbe
> >> +ifeq ($(CONFIG_RTE_LIBRTE_IXGBE_PMD),y)
> >> +EXTRA_LDLIBS += -lrte_pmd_ixgbe
> >>  endif
> > 
> > You need to keep the shared lib check.
> > Anyway, EXTRA_LDLIBS should be reserved to users and not used in a Makefile.
> > I prefer your initial patch using _LDLIBS.
> > 
> > Any objection to merge initial proposal?
> > 
> 
> LDLIBS should be OK, as long as wrapped with SHARED check. Is following
> not working:

No, due to the following line
mk/rte.app.mk:LDLIBS += $(_LDLIBS-y) $(CPU_LDLIBS) $(EXTRA_LDLIBS)

Again -lrte_pmd_ixgbe comes first.

> 
> -_LDLIBS-$(CONFIG_RTE_LIBRTE_IXGBE_PMD) += -lrte_pmd_ixgbe
> +ifeq ($(CONFIG_RTE_BUILD_SHARED_LIB),y)
> +ifeq ($(CONFIG_RTE_LIBRTE_IXGBE_PMD),y)
> +LDLIBS += -lrte_pmd_ixgbe
> +endif
> +endif