meson: detect kernel version

Add kernel version detection to warn user
that only >= 5.0.0 V4L API are supported in
libcamera.

Signed-off-by: Stéphane Cerveau <scerveau@collabora.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

1 files changed, 11 insertions, 0 deletions

diff --git a/meson.build b/meson.build
index e898782a..ec54e68f 100644
--- a/meson.build
+++ b/meson.build
@@ -105,6 +105,17 @@ if get_option('test')
     subdir('test')
 endif
 
+if not meson.is_cross_build()
+    kernel_version_req = '>= 5.0.0'
+    kernel_version = run_command('uname', '-r').stdout().strip()
+    if not kernel_version.version_compare(kernel_version_req)
+        warning('The current running kernel version @0@ is too old to run libcamera.'
+                .format(kernel_version))
+        warning('If you intend to use libcamera on this machine, please upgrade to a kernel @0@.'
+                .format(kernel_version_req))
+    endif
+endif
+
 # Create a symlink from the build root to the source root. This is used when
 # running libcamera from the build directory to locate resources in the source
 # directory (such as IPA configuration files).