[v4l-utils PATCH 1/1] Fix static linking of v4l2-compliance and v4l2-ctl

[Sakari Ailus <sakari.ailus@linux.intel.com>]

v4l2-compliance and v4l2-ctl depend on librt and libpthread. The symbols
are found by the linker only if these libraries are specified after the
objects that depend on them.

As LDFLAGS variable end up expanded on libtool command line before LDADD,
move the libraries to LDADD after local objects. -lpthread is added as on
some systems librt depends on libpthread. This is the case on Ubuntu 16.04
for instance.

After this patch, creating a static build using the command

LDFLAGS="--static -static" ./configure --disable-shared --enable-static

works again.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
---
Hi,

This patch fixes the static build; the error is:

  CXXLD    v4l2-compliance
../../lib/libv4l2/.libs/libv4l2.a(libv4l2_la-v4l2-plugin.o): In function `v4l2_plugin_init':
/home/sailus/a/v4l-utils/lib/libv4l2/v4l2-plugin.c:75: warning: Using 'dlopen' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
/home/sailus/a/v4l-utils/lib/libv4lconvert/.libs/libv4lconvert.a(libv4lconvert_la-libv4lcontrol.o): In function `v4lcontrol_create':
/home/sailus/a/v4l-utils/lib/libv4lconvert/control/libv4lcontrol.c:693: warning: Using 'getpwuid_r' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
/usr/lib/gcc/x86_64-linux-gnu/5/../../../x86_64-linux-gnu/librt.a(shm_open.o): In function `shm_open':
(.text+0x1f): undefined reference to `__shm_directory'
collect2: error: ld returned 1 exit status
distcc[21660] ERROR: compile (null) on localhost failed
Makefile:559: recipe for target 'v4l2-compliance' failed

Kind regards,
Sakari

 utils/v4l2-compliance/Makefile.am | 4 ++--
 utils/v4l2-ctl/Makefile.am        | 3 +--
 2 files changed, 3 insertions(+), 4 deletions(-)

diff --git a/utils/v4l2-compliance/Makefile.am b/utils/v4l2-compliance/Makefile.am
index a895e8e..c2b5919 100644
--- a/utils/v4l2-compliance/Makefile.am
+++ b/utils/v4l2-compliance/Makefile.am
@@ -5,12 +5,12 @@ DEFS :=
 v4l2_compliance_SOURCES = v4l2-compliance.cpp v4l2-test-debug.cpp v4l2-test-input-output.cpp \
 	v4l2-test-controls.cpp v4l2-test-io-config.cpp v4l2-test-formats.cpp v4l2-test-buffers.cpp \
 	v4l2-test-codecs.cpp v4l2-test-colors.cpp v4l2-compliance.h
-v4l2_compliance_LDFLAGS = -lrt
 v4l2_compliance_CPPFLAGS = -I../common
 
 if WITH_V4L2_COMPLIANCE_LIBV4L
-v4l2_compliance_LDADD = ../../lib/libv4l2/libv4l2.la ../../lib/libv4lconvert/libv4lconvert.la
+v4l2_compliance_LDADD = ../../lib/libv4l2/libv4l2.la ../../lib/libv4lconvert/libv4lconvert.la -lrt -lpthread
 else
+v4l2_compliance_LDADD = -lrt -lpthread
 DEFS += -DNO_LIBV4L2
 endif
 
diff --git a/utils/v4l2-ctl/Makefile.am b/utils/v4l2-ctl/Makefile.am
index 56943cd..2a05644 100644
--- a/utils/v4l2-ctl/Makefile.am
+++ b/utils/v4l2-ctl/Makefile.am
@@ -7,11 +7,10 @@ v4l2_ctl_SOURCES = v4l2-ctl.cpp v4l2-ctl.h v4l2-ctl-common.cpp v4l2-ctl-tuner.cp
 	v4l2-ctl-overlay.cpp v4l2-ctl-vbi.cpp v4l2-ctl-selection.cpp v4l2-ctl-misc.cpp \
 	v4l2-ctl-streaming.cpp v4l2-ctl-sdr.cpp v4l2-ctl-edid.cpp v4l2-ctl-modes.cpp \
 	v4l2-tpg-colors.c v4l2-tpg-core.c v4l-stream.c
-v4l2_ctl_LDFLAGS = -lrt
 v4l2_ctl_CPPFLAGS = -I../common
 
 if WITH_V4L2_CTL_LIBV4L
-v4l2_ctl_LDADD = ../../lib/libv4l2/libv4l2.la ../../lib/libv4lconvert/libv4lconvert.la
+v4l2_ctl_LDADD = ../../lib/libv4l2/libv4l2.la ../../lib/libv4lconvert/libv4lconvert.la -lrt -lpthread
 else
 DEFS += -DNO_LIBV4L2
 endif
-- 
2.7.4