[Buildroot] [PATCH v2 1/1] package/eudev: fix compile-time issue with very old kernel headers

[Stefan Ott via buildroot <buildroot@buildroot.org>]

Kernel versions prior to 3.4 did not have V4L2_CAP_DEVICE_CAPS and
compiling against such a kernel will fail.

This patch introduces a version check and makes eudev fall back to
v2cap.capabilities on these kernels.

Upstream: https://github.com/eudev-project/eudev/pull/247
Signed-off-by: Stefan Ott <stefan@ott.net>
---
Changes v1 -> v2 (suggested by Arnout Vandecappelle):
- Clarified description to talk about kernel *headers*
- Use a git-formatted patch instead
- Added a Signed-off-by line
- Added upstream reference

 ...mpile-time-issue-on-very-old-kernels.patch | 43 +++++++++++++++++++
 1 file changed, 43 insertions(+)
 create mode 100644 package/eudev/0002-Fix-compile-time-issue-on-very-old-kernels.patch

diff --git a/package/eudev/0002-Fix-compile-time-issue-on-very-old-kernels.patch b/package/eudev/0002-Fix-compile-time-issue-on-very-old-kernels.patch
new file mode 100644
index 0000000000..c18ce2ad5a
--- /dev/null
+++ b/package/eudev/0002-Fix-compile-time-issue-on-very-old-kernels.patch
@@ -0,0 +1,43 @@
+From 09b536e0b9d0964674936901ab9d2954f935c8b4 Mon Sep 17 00:00:00 2001
+From: Stefan Ott <stefan@ott.net>
+Date: Wed, 5 Apr 2023 18:20:37 +0200
+Subject: [PATCH] Fix compile-time issue on very old kernels
+
+Kernel versions prior to 3.4 did not have V4L2_CAP_DEVICE_CAPS and
+compiling against such a kernel will fail.
+
+This patch introduces a version check and makes eudev fall back to
+v2cap.capabilities on these kernels.
+
+Signed-off-by: Stefan Ott <stefan@ott.net>
+---
+ src/v4l_id/v4l_id.c | 3 +++
+ 1 file changed, 3 insertions(+)
+
+diff --git a/src/v4l_id/v4l_id.c b/src/v4l_id/v4l_id.c
+index 6bf45effe..702d5b687 100644
+--- a/src/v4l_id/v4l_id.c
++++ b/src/v4l_id/v4l_id.c
+@@ -28,6 +28,7 @@
+ #include <sys/types.h>
+ #include <sys/time.h>
+ #include <sys/ioctl.h>
++#include <linux/version.h>
+ #include <linux/videodev2.h>
+ 
+ #include "util.h"
+@@ -71,9 +72,11 @@ int main(int argc, char *argv[]) {
+                 printf("ID_V4L_VERSION=2\n");
+                 printf("ID_V4L_PRODUCT=%s\n", v2cap.card);
+                 printf("ID_V4L_CAPABILITIES=:");
++#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)
+                 if (v2cap.capabilities & V4L2_CAP_DEVICE_CAPS)
+                         capabilities = v2cap.device_caps;
+                 else
++#endif
+                         capabilities = v2cap.capabilities;
+                 if ((capabilities & V4L2_CAP_VIDEO_CAPTURE) > 0 ||
+                     (capabilities & V4L2_CAP_VIDEO_CAPTURE_MPLANE) > 0)
+-- 
+2.40.0
+
-- 
2.40.0

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