Re: [dpdk-dev] [PATCH] pci: fix missing pci bus with shared library build

[Stephen Hemminger <stephen@networkplumber.org>]

On Mon, 15 Jul 2019 16:41:36 -0700
Stephen Hemminger <stephen@networkplumber.org> wrote:

> If DPDK is built as a shared library, then any application linked
> with rte.app.mk will not find any PCI devices. When the application
> is started no ethernet devices are found.
> 
> This is because the link order of libraries on the command line matters.
> And PCI is before EAL. That causes there to be no dependency on PCI
> so linker ignores linking the library. 
> Swapping the order fixes this.
> 
> Fixes: c752998b5e2e ("pci: introduce library and driver")
> Cc: stable@dpdk.org
> Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
> ---
>  mk/rte.app.mk | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/mk/rte.app.mk b/mk/rte.app.mk
> index a277c808ed8e..470b92e4d73e 100644
> --- a/mk/rte.app.mk
> +++ b/mk/rte.app.mk
> @@ -90,8 +90,8 @@ _LDLIBS-$(CONFIG_RTE_LIBRTE_STACK)          += -lrte_stack
>  _LDLIBS-$(CONFIG_RTE_DRIVER_MEMPOOL_RING)   += -lrte_mempool_ring
>  _LDLIBS-$(CONFIG_RTE_LIBRTE_OCTEONTX2_MEMPOOL) += -lrte_mempool_octeontx2
>  _LDLIBS-$(CONFIG_RTE_LIBRTE_RING)           += -lrte_ring
> -_LDLIBS-$(CONFIG_RTE_LIBRTE_PCI)            += -lrte_pci
>  _LDLIBS-$(CONFIG_RTE_LIBRTE_EAL)            += -lrte_eal
> +_LDLIBS-$(CONFIG_RTE_LIBRTE_PCI)            += -lrte_pci
>  _LDLIBS-$(CONFIG_RTE_LIBRTE_CMDLINE)        += -lrte_cmdline
>  _LDLIBS-$(CONFIG_RTE_LIBRTE_REORDER)        += -lrte_reorder
>  _LDLIBS-$(CONFIG_RTE_LIBRTE_SCHED)          += -lrte_sched

This only seems to happen on 18.11 and if configuration is reduced.