build: Add libudev on Linux

CMakeLists.txt

@@ -37,9 +37,13 @@ pkg_check_modules(FFMPEG libavcodec)
 
 
 if(CMAKE_SYSTEM_NAME STREQUAL "Linux")
+	# Compositor backend
 	find_package(X11)
 	find_package(Wayland)
 	pkg_check_modules(XCB xcb xcb-randr)
+
+	find_package(udev REQUIRED)
+	set(BUILD_WITH_LIBUDEV TRUE)
 endif()
 
 cmake_dependent_option(BUILD_WITH_WAYLAND "Enable Wayland support" ON "WAYLAND_FOUND" OFF)
@@ -67,6 +71,10 @@ endif()
 # Flags
 ###
 
+if(BUILD_WITH_LIBUDEV)
+	add_definitions(-DXRT_HAVE_LIBUDEV)
+endif()
+
 if(BUILD_WITH_LIBUSB)
 	add_definitions(-DXRT_HAVE_LIBUSB)
 endif()

cmake/Findudev.cmake

+# - try to find the udev library
+#
+# Cache Variables: (probably not for direct use in your scripts)
+#  UDEV_INCLUDE_DIR
+#  UDEV_SOURCE_DIR
+#  UDEV_LIBRARY
+#
+# Non-cache variables you might use in your CMakeLists.txt:
+#  UDEV_FOUND
+#  UDEV_INCLUDE_DIRS
+#  UDEV_LIBRARIES
+#
+# Requires these CMake modules:
+#  FindPackageHandleStandardArgs (known included with CMake >=2.6.2)
+#
+# Original Author:
+# 2014 Kevin M. Godby <kevin@godby.org>
+#
+# Distributed under the Boost Software License, Version 1.0.
+# (See accompanying file LICENSE_1_0.txt or copy at
+# http://www.boost.org/LICENSE_1_0.txt)
+
+set(UDEV_ROOT_DIR
+    "${UDEV_ROOT_DIR}"
+	CACHE
+	PATH
+    "Directory to search for udev")
+
+find_package(PkgConfig QUIET)
+if(PKG_CONFIG_FOUND)
+	pkg_check_modules(PC_LIBUDEV libudev)
+endif()
+
+find_library(UDEV_LIBRARY
+	NAMES
+	udev
+	PATHS
+	${PC_LIBUDEV_LIBRARY_DIRS}
+	${PC_LIBUDEV_LIBDIR}
+	HINTS
+	"${UDEV_ROOT_DIR}"
+	PATH_SUFFIXES
+	lib
+	)
+
+get_filename_component(_libdir "${UDEV_LIBRARY}" PATH)
+
+find_path(UDEV_INCLUDE_DIR
+	NAMES
+	libudev.h
+	PATHS
+	${PC_LIBUDEV_INCLUDE_DIRS}
+	${PC_LIBUDEV_INCLUDEDIR}
+	HINTS
+	"${_libdir}"
+	"${_libdir}/.."
+	"${UDEV_ROOT_DIR}"
+	PATH_SUFFIXES
+	include
+	)
+
+include(FindPackageHandleStandardArgs)
+find_package_handle_standard_args(UDEV
+	DEFAULT_MSG
+	UDEV_LIBRARY
+	UDEV_INCLUDE_DIR
+	)
+
+if(UDEV_FOUND)
+	list(APPEND UDEV_LIBRARIES ${UDEV_LIBRARY})
+	list(APPEND UDEV_INCLUDE_DIRS ${UDEV_INCLUDE_DIR})
+	mark_as_advanced(UDEV_ROOT_DIR)
+endif()
+
+mark_as_advanced(UDEV_INCLUDE_DIR
+	UDEV_LIBRARY)
+