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From: Olivier Matz <olivier.matz@6wind.com>
To: dev@dpdk.org
Cc: Bruce Richardson <bruce.richardson@intel.com>,
Harry van Haaren <harry.van.haaren@intel.com>,
Keith Wiles <keith.wiles@intel.com>,
Luca Boccassi <luca.boccassi@gmail.com>, stable@dpdk.org
Date: Thu, 26 Nov 2020 15:20:42 +0100
Message-Id: <20201126142042.24741-1-olivier.matz@6wind.com>
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Subject: [dpdk-dev] [PATCH] app: fix plugin load on static builds
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When dpdk is compiled as static libraries, it is not possible
to load a plugin from an application. We get the following error:
EAL: librte_pmd_xxxx.so: undefined symbol: per_lcore__rte_errno
This happens because the dpdk symbols are not exported. Add them to the
dynamic symbol table by using '-Wl,--export-dynamic'. This option was
previously present when compiled with Makefiles, it was introduced in
commit f9a08f650211 ("eal: add support for shared object drivers")
Fixes: 16ade738fd0d ("app/testpmd: build with meson")
Fixes: 89f0711f9ddf ("examples: build some samples with meson")
Cc: stable@dpdk.org
Signed-off-by: Olivier Matz <olivier.matz@6wind.com>
---
Hi,
Maybe the patch can be improved: I suppose that --export-dynamic
should only be added in case we are linking in static mode. Any
help about how to do that is welcome.
There is probably a better place to define the default ldflags for
all applications (to factorize between app and example).
Also, should this flag be advertised in pkg-config?
Thanks,
Olivier
app/meson.build | 3 +++
examples/meson.build | 4 +++-
2 files changed, 6 insertions(+), 1 deletion(-)
diff --git a/app/meson.build b/app/meson.build
index eb74f215a3..92479c7729 100644
--- a/app/meson.build
+++ b/app/meson.build
@@ -25,6 +25,7 @@ apps = [
lib_execinfo = cc.find_library('execinfo', required: false)
default_cflags = machine_args + ['-DALLOW_EXPERIMENTAL_API']
+default_ldflags = ['-Wl,--export-dynamic']
foreach app:apps
build = true
@@ -32,6 +33,7 @@ foreach app:apps
sources = []
includes = []
cflags = default_cflags
+ ldflags = default_ldflags
objs = [] # other object files to link against, used e.g. for
# instruction-set optimized versions of code
@@ -58,6 +60,7 @@ foreach app:apps
executable('dpdk-' + name,
sources,
c_args: cflags,
+ link_args: ldflags,
link_whole: link_libs,
dependencies: dep_objs,
install_rpath: join_paths(get_option('prefix'),
diff --git a/examples/meson.build b/examples/meson.build
index 46ec80919e..def4540e8f 100644
--- a/examples/meson.build
+++ b/examples/meson.build
@@ -63,6 +63,7 @@ default_cflags = machine_args
if cc.has_argument('-Wno-format-truncation')
default_cflags += '-Wno-format-truncation'
endif
+default_ldflags = ['-Wl,--export-dynamic'] + dpdk_extra_ldflags
foreach example: examples
name = example.split('/')[-1]
@@ -70,6 +71,7 @@ foreach example: examples
sources = []
allow_experimental_apis = false
cflags = default_cflags
+ ldflags = default_ldflags
ext_deps = [execinfo]
includes = [include_directories(example)]
@@ -91,7 +93,7 @@ foreach example: examples
executable('dpdk-' + name, sources,
include_directories: includes,
link_whole: link_whole_libs,
- link_args: dpdk_extra_ldflags,
+ link_args: ldflags,
c_args: cflags,
dependencies: dep_objs)
elif not allow_skips
--
2.25.1