Dynamically load libudev in linux-hidraw backend

Signed-off-by: falkTX <falktx@falktx.com>

Author: falkTX

linux/CMakeLists.txt

@@ -8,10 +8,7 @@ target_link_libraries(hidapi_hidraw PUBLIC hidapi_include)
 
 find_package(Threads REQUIRED)
 
-include(FindPkgConfig)
-pkg_check_modules(libudev REQUIRED IMPORTED_TARGET libudev)
-
-target_link_libraries(hidapi_hidraw PRIVATE PkgConfig::libudev Threads::Threads)
+target_link_libraries(hidapi_hidraw PRIVATE Threads::Threads dl)
 
 set_target_properties(hidapi_hidraw
     PROPERTIES

linux/hid.c

@@ -40,7 +40,9 @@
 #include <linux/hidraw.h>
 #include <linux/version.h>
 #include <linux/input.h>
-#include <libudev.h>
+
+/* falkTX: replaced by local file for dynamic loading */
+#include "libudev.c"
 
 #include "hidapi.h"
 

linux/libudev.c

@@ -0,0 +1,118 @@
+/* SPDX-FileCopyrightText: 2026 Filipe Coelho <falktx@falktx.com> */
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <dlfcn.h>
+#include <stdarg.h>
+#include <stddef.h>
+
+#define C(FN) static typeof(FN)* FN; { if (FN == NULL) FN = dlsym(NULL, #FN); }
+
+#define udev_list_entry_foreach(varname, front) \
+    for (varname = front; varname != NULL; varname = udev_list_entry_get_next(varname))
+
+struct udev *udev_new(void)
+{
+    static void* _lib;
+    if (_lib == NULL)
+    {
+        _lib = dlopen("libudev.so.1", RTLD_NOW | RTLD_GLOBAL);
+        if (_lib == NULL)
+            return NULL;
+    }
+
+    C(udev_new);
+    return udev_new();
+}
+
+struct udev *udev_unref(struct udev *udev)
+{
+    C(udev_unref);
+    return udev_unref(udev);
+}
+
+struct udev_device *udev_device_new_from_devnum(struct udev *udev, char type, dev_t devnum)
+{
+    C(udev_device_new_from_devnum);
+    return udev_device_new_from_devnum(udev, type, devnum);
+}
+
+struct udev_device *udev_device_new_from_syspath(struct udev *udev, const char *syspath)
+{
+    C(udev_device_new_from_syspath);
+    return udev_device_new_from_syspath(udev, syspath);
+}
+
+struct udev_device *udev_device_unref(struct udev_device *udev_device)
+{
+    C(udev_device_unref);
+    return udev_device_unref(udev_device);
+}
+
+struct udev_device *udev_device_get_parent_with_subsystem_devtype(struct udev_device *udev_device,
+                                                                  const char *subsystem, const char *devtype)
+{
+    C(udev_device_get_parent_with_subsystem_devtype);
+    return udev_device_get_parent_with_subsystem_devtype(udev_device, subsystem, devtype);
+}
+
+const char* udev_device_get_syspath(struct udev_device *udev_device)
+{
+    C(udev_device_get_syspath);
+    return udev_device_get_syspath(udev_device);
+}
+
+const char* udev_device_get_devnode(struct udev_device *udev_device)
+{
+    C(udev_device_get_devnode);
+    return udev_device_get_devnode(udev_device);
+}
+
+const char* udev_device_get_sysattr_value(struct udev_device *udev_device, const char *sysattr)
+{
+    C(udev_device_get_sysattr_value);
+    return udev_device_get_sysattr_value(udev_device, sysattr);
+}
+
+struct udev_enumerate *udev_enumerate_new(struct udev *udev)
+{
+    C(udev_enumerate_new);
+    return udev_enumerate_new(udev);
+}
+
+struct udev_enumerate *udev_enumerate_unref(struct udev_enumerate *udev_enumerate)
+{
+    C(udev_enumerate_unref);
+    return udev_enumerate_unref(udev_enumerate);
+}
+
+int udev_enumerate_add_match_subsystem(struct udev_enumerate *udev_enumerate, const char *subsystem)
+{
+    C(udev_enumerate_add_match_subsystem);
+    return udev_enumerate_add_match_subsystem(udev_enumerate, subsystem);
+}
+
+int udev_enumerate_scan_devices(struct udev_enumerate *udev_enumerate)
+{
+    C(udev_enumerate_scan_devices);
+    return udev_enumerate_scan_devices(udev_enumerate);
+}
+
+struct udev_list_entry *udev_enumerate_get_list_entry(struct udev_enumerate *udev_enumerate)
+{
+    C(udev_enumerate_get_list_entry);
+    return udev_enumerate_get_list_entry(udev_enumerate);
+}
+
+struct udev_list_entry *udev_list_entry_get_next(struct udev_list_entry *list_entry)
+{
+    C(udev_list_entry_get_next);
+    return udev_list_entry_get_next(list_entry);
+}
+
+const char* udev_list_entry_get_name(struct udev_list_entry *list_entry)
+{
+    C(udev_list_entry_get_name);
+    return udev_list_entry_get_name(list_entry);
+}
+
+#undef C