v4l2: Move the v4l2 compat layer to libexec/libcamera

Move the v4l2-compat.so shared library installation to the libcamera
directory under libexec. This is the same location that the proxy
workers live and will facilitate easier packaging of the V4L2
compatibility layer with distributions.

Create a new libcamera_libexecdir variable within meson to simplify
representation of this path and update the proxy worker meson.build
infrastructure to make use of it as well.

Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

src/libcamera/proxy/worker/meson.build

@@ -1,6 +1,6 @@
 # SPDX-License-Identifier: CC0-1.0
 
-proxy_install_dir = get_option('libexecdir') / 'libcamera'
+proxy_install_dir = libcamera_libexecdir
 
 # generate {pipeline}_ipa_proxy_worker.cpp
 foreach mojom : ipa_mojoms

src/meson.build

@@ -3,6 +3,7 @@
 # Cache system paths
 libcamera_datadir = get_option('datadir') / 'libcamera'
 libcamera_libdir = get_option('libdir') / 'libcamera'
+libcamera_libexecdir = get_option('libexecdir') / 'libcamera'
 libcamera_sysconfdir = get_option('sysconfdir') / 'libcamera'
 
 config_h.set('LIBCAMERA_DATA_DIR', '"' + get_option('prefix') / libcamera_datadir + '"')

src/v4l2/meson.build

@@ -31,6 +31,7 @@ v4l2_compat = shared_library('v4l2-compat',
                              v4l2_compat_sources,
                              name_prefix : '',
                              install : true,
+                             install_dir : libcamera_libexecdir,
                              dependencies : [libcamera_private, libdl],
                              cpp_args : v4l2_compat_cpp_args)
 
@@ -38,7 +39,7 @@ v4l2_compat = shared_library('v4l2-compat',
 # adaptation layer.
 
 cdata = configuration_data()
-cdata.set('LIBCAMERA_V4L2_SO', get_option('prefix') / get_option('libdir') / 'v4l2-compat.so')
+cdata.set('LIBCAMERA_V4L2_SO', get_option('prefix') / libcamera_libexecdir / 'v4l2-compat.so')
 
 configure_file(input : 'libcamerify.in',
                output : 'libcamerify',