[yocto] [meta-raspberrypi][PATCH 1/2] userland: Add '--no-as-needed' linker flag to ensure all specified shared libraries are linked against applications (e.g. raspivid)

Alex J Lennon ajlennon at dynamicdevices.co.uk
Mon Jun 2 03:58:34 PDT 2014


libmmal_vc_client.so makes use of __attribute__(constructor) to ensure that supplier components (e.g. camera) are loaded when the static library is loaded.

raspivid, and possibly other applications, link against libmmal_vc_client.so, causing the ctor to execute, but there is no needed dependency.

Some build environments (e.g. Yocto/OpenEmbedded) pass the '--no-as-needed' linker flag which removes the dependency on libmmal_vc_client and thus components are not registered.

In this situation raspivid then gives an error of the form

  root at raspberrypi:~# raspivid -o test
  mmal: mmal_component_create_core: could not find component 'vc.ril.camera'
  mmal: Failed to create camera component
  mmal: main: Failed to create camera component
  mmal: Failed to run camera app. Please check for firmware updates

For further details see: https://lists.yoctoproject.org/pipermail/yocto/2014-June/019933.html

Change-Id: I9d787fd83379e8b6428dde3827395c8b96be1f7f
Signed-off-by: Alex J Lennon <ajlennon at dynamicdevices.co.uk>
---
 recipes-graphics/userland/userland_git.bb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/recipes-graphics/userland/userland_git.bb b/recipes-graphics/userland/userland_git.bb
index a348090..4b405ee 100644
--- a/recipes-graphics/userland/userland_git.bb
+++ b/recipes-graphics/userland/userland_git.bb
@@ -18,7 +18,7 @@ S = "${WORKDIR}/git"
 
 inherit cmake
 
-EXTRA_OECMAKE = "-DCMAKE_BUILD_TYPE=Release"
+EXTRA_OECMAKE = "-DCMAKE_BUILD_TYPE=Release -DCMAKE_EXE_LINKER_FLAGS='-Wl,--no-as-needed'"
 
 # The compiled binaries don't provide sonames.
 SOLIBS = "${SOLIBSDEV}"
-- 
2.0.0




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