From: Alex J Lennon <ajlennon@...>

This is done to ensure all specified shared libraries are linked against
applications (e.g. raspivid)i.

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@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@...>
Acked-by: Andrei Gherzan <andrei@...>
---
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}"
--
1.9.0