[libcamera-devel] [PATCH v2] libcamera: Add option to configure udev support

[Laurent Pinchart]

libcamera uses udev to support hotplug (and unplug) detection. This is
an optional feature, which gets selected automatically if udev is
available. Users may however want to build libcamera without hotplug
detection, even if udev is available on the system. Add a new feature
option to control udev support. The default value is auto, which retains
the existing behaviour.

Signed-off-by: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
---
Changes since v1:

- Add configuration summary for hotplug
---
 meson.build               | 1 +
 meson_options.txt         | 5 +++++
 src/libcamera/meson.build | 2 +-
 3 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/meson.build b/meson.build
index 29777529a0d9..363de459e537 100644
--- a/meson.build
+++ b/meson.build
@@ -261,6 +261,7 @@ py_mod.find_installation('python3', modules : py_modules)
 summary({
             'Enabled pipelines': pipelines,
             'Enabled IPA modules': enabled_ipa_names,
+            'Hotplug support': libudev.found(),
             'Tracing support': tracing_enabled,
             'Android support': android_enabled,
             'GStreamer support': gst_enabled,
diff --git a/meson_options.txt b/meson_options.txt
index 4405b401d7d3..fad928af4b62 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -66,6 +66,11 @@ option('tracing',
         value : 'auto',
         description : 'Enable tracing (based on lttng)')
 
+option('udev',
+       type : 'feature',
+       value : 'auto',
+       description : 'Enable udev support for hotplug')
+
 option('v4l2',
         type : 'boolean',
         value : false,
diff --git a/src/libcamera/meson.build b/src/libcamera/meson.build
index 38fbb41e7d6c..b24f82965764 100644
--- a/src/libcamera/meson.build
+++ b/src/libcamera/meson.build
@@ -76,7 +76,7 @@ libdl = null_dep
 if not cc.has_function('dlopen')
     libdl = cc.find_library('dl')
 endif
-libudev = dependency('libudev', required : false)
+libudev = dependency('libudev', required : get_option('udev'))
 libyaml = dependency('yaml-0.1', required : false)
 
 # Use one of gnutls or libcrypto (provided by OpenSSL), trying gnutls first.

base-commit: d06ed87d49ca3d734fd1c2f1409280abb499c625
prerequisite-patch-id: 03020483e75d365fa1661922fc66b2f16ea11a04
-- 
Regards,

Laurent Pinchart