From 9f270005181ae0fe31cc26f02ec790a32d3ffe1c Mon Sep 17 00:00:00 2001
From: Bernhard Miklautz <bernhard.miklautz@thincast.com>
Date: Sun, 18 Jan 2015 22:23:50 +0100
Subject: [PATCH] build: improve wayland detection

* add support to check wayland client version
* set minimum required version to 0.95
---
 cmake/FindWayland.cmake | 27 +++++++++++++++++++++++----
 1 file changed, 23 insertions(+), 4 deletions(-)

diff --git a/cmake/FindWayland.cmake b/cmake/FindWayland.cmake
index 131544465..36c384c6e 100644
--- a/cmake/FindWayland.cmake
+++ b/cmake/FindWayland.cmake
@@ -8,10 +8,12 @@
 #
 #     WAYLAND_INCLUDE_DIR  - where to find wayland-client.h, etc.
 #     WAYLAND_LIBRARY      - the Wayland client library
+#     WAYLAND_VERSION      - wayland client version if found and pkg-config was used
 #
 
 #=============================================================================
 # Copyright 2014 Manuel Bachmann <tarnyko@tarnyko.net>
+# Copyright 2015 Bernhard Miklautz <bernhard.miklautz@shacknet.at>
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -26,21 +28,38 @@
 # limitations under the License.
 #=============================================================================
 
+set(REQUIRED_WAYLAND_CLIENT_VERSION 0.95)
+include(FindPkgConfig)
+
+if(PKG_CONFIG_FOUND)
+  pkg_check_modules(WAYLAND wayland-client)
+endif()
+
 find_path(WAYLAND_INCLUDE_DIR NAMES wayland-client.h
+          PATHS ${WAYLAND_INCLUDE_DIRS}
           DOC "The Wayland include directory"
 )
 
 find_library(WAYLAND_LIBRARY NAMES wayland-client
+          PATHS ${WAYLAND_LIBRARY_DIRS}
           DOC "The Wayland client library"
 )
 
 include(FindPackageHandleStandardArgs)
 FIND_PACKAGE_HANDLE_STANDARD_ARGS(WAYLAND DEFAULT_MSG WAYLAND_LIBRARY WAYLAND_INCLUDE_DIR)
 
-if(WAYLAND_FOUND)
-  set( WAYLAND_LIBRARIES ${WAYLAND_LIBRARY} )
-  set( WAYLAND_INCLUDE_DIRS ${WAYLAND_INCLUDE_DIR} )
+if(WAYLAND_VERSION)
+	if (${WAYLAND_VERSION} VERSION_LESS ${REQUIRED_WAYLAND_CLIENT_VERSION})
+		message(WARNING "Installed wayland version ${WAYLAND_VERSION} is too old - minimum required version ${REQUIRED_WAYLAND_CLIENT_VERSION}")
+		set(WAYLAND_FOUND FALSE)
+	endif()
+else()
+		message(WARNING "Couldn't detect wayland version - no version check is done")
 endif()
 
-mark_as_advanced(WAYLAND_INCLUDE_DIR WAYLAND_LIBRARY)
+if(WAYLAND_FOUND)
+  set(WAYLAND_LIBRARIES ${WAYLAND_LIBRARY})
+  set(WAYLAND_INCLUDE_DIRS ${WAYLAND_INCLUDE_DIR})
+endif()
 
+mark_as_advanced(WAYLAND_INCLUDE_DIR WAYLAND_LIBRARY WAYLAND_VERSION)