[dpdk-dev] [PATCH v2 1/2] bus: fix missing pci bus with shared library build

[Stephen Hemminger <stephen@networkplumber.org>]

If DPDK is built as a shared library, then any application linked
with rte.app.mk will not find any buses (including PCI devices).

This is because the linker will not call the initializers
of the bus libraries since they are not directly called by
application or EAL.

Bugzilla ID: 333
Fixes: c752998b5e2e ("pci: introduce library and driver")
Cc: stable@dpdk.org
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
---
 mk/rte.app.mk | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/mk/rte.app.mk b/mk/rte.app.mk
index a277c808ed8e..3b3156bfcf09 100644
--- a/mk/rte.app.mk
+++ b/mk/rte.app.mk
@@ -123,6 +123,10 @@ ifneq (,$(findstring y,$(MVEP-y)))
 _LDLIBS-y += -lrte_common_mvep -L$(LIBMUSDK_PATH)/lib -lmusdk
 endif
 
+# Bus devices use constructors to register and therefore
+# need to be always linked in (--whole-archive already enabled)
+_LDLIBS-y += --no-as-needed
+
 ifeq ($(CONFIG_RTE_LIBRTE_DPAA_BUS),y)
 _LDLIBS-$(CONFIG_RTE_LIBRTE_COMMON_DPAAX)   += -lrte_common_dpaax
 endif
@@ -137,6 +141,9 @@ ifeq ($(CONFIG_RTE_EAL_VFIO),y)
 _LDLIBS-$(CONFIG_RTE_LIBRTE_FSLMC_BUS)      += -lrte_bus_fslmc
 endif
 
+# drivers are as-needed
+_LDLIBS-y += --as-needed
+
 ifeq ($(CONFIG_RTE_BUILD_SHARED_LIB),n)
 # plugins (link only if static libraries)
 
-- 
2.20.1