[dpdk-dev] [PATCH v2] build: avoid --as-needed as it causes overlinking

Christian Ehrhardt christian.ehrhardt at canonical.com
Thu Aug 29 17:30:03 CEST 2019

A while ago telemetry was added in 57ae0ec6 and it also added as-needed
to config/meson.build. This seems no more needed these days as due to other
build changes the ordering in buildlogs is:
  [...] -lrte_telemetry [...] -Wl,--no-as-needed [...]
Which means telemetry no more benefits from --no-as-needed anyway.

Overlinking problems get triggered by the meson generated pkgconfig which
will have:
   [...] -Wl,--no-as-needed <somelibsusedbydpdk>
This will overlink <somelibs> and in addition anything that follows
as it also doesn't wrap back to --as-needed. So if a projects includes
dpdk libs + <other> it will also consider <other> with --no-as-needed.

Fixes: https://bugs.launchpad.net/ubuntu/+source/dpdk/+bug/1841759

Signed-off-by: Christian Ehrhardt <christian.ehrhardt at canonical.com>
Acked-by: Luca Boccassi <bluca at debian.org>
 config/meson.build | 1 -
 1 file changed, 1 deletion(-)

diff --git a/config/meson.build b/config/meson.build
index 2bafea530..a27f731f8 100644
--- a/config/meson.build
+++ b/config/meson.build
@@ -94,7 +94,6 @@ dpdk_conf.set('RTE_TOOLCHAIN_' + toolchain.to_upper(), 1)
 dpdk_conf.set('RTE_ARCH_64', cc.sizeof('void *') == 8)
 add_project_link_arguments('-Wl,--no-as-needed', language: 'c')
-dpdk_extra_ldflags += '-Wl,--no-as-needed'
 # use pthreads
 add_project_link_arguments('-pthread', language: 'c')

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