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v4l2: Define ioctl_req_t for posix/linux case

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this is an issue seen with musl based linux distros e.g. alpine [1]
musl is not going to change this since it breaks ABI/API interfaces
Newer compilers are stringent ( e.g. clang16 ) which can now detect
signature mismatches in function pointers too, existing code warned but
did not error with older clang

Fixes
gstv4l2object.c:544:23: error: incompatible function pointer types assigning to 'gint (*)(gint, ioctl_req_t, ...)' (aka 'int (*)(int, unsigned long, ...)') from 'int (int, int, ...)' [-Wincompatible-function-pointer-types]
    v4l2object->ioctl = ioctl;
                      ^ ~~~~~

[1] https://gitlab.alpinelinux.org/alpine/aports/-/issues/7580

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/3950>
This commit is contained in:
Khem Raj 2023-02-13 12:47:31 -08:00 committed by GStreamer Marge Bot
parent 1cabfebd2f
commit 817339c4de
1 changed files with 2 additions and 0 deletions
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subprojects/gst-plugins-good/sys/v4l2/gstv4l2object.h
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@ -76,6 +76,8 @@ typedef gboolean (*GstV4l2UpdateFpsFunction) (GstV4l2Object * v4l2object);
* 'unsigned long' for the 2nd parameter */
#ifdef __ANDROID__
typedef unsigned ioctl_req_t;
#elif defined(__linux__) && !defined(__GLIBC__) /* musl/linux */
typedef int ioctl_req_t;
#else
typedef gulong ioctl_req_t;
#endif