X-Git-Url: https://git.quassel-irc.org/?p=quassel.git;a=blobdiff_plain;f=cmake%2Fmodules%2FFindDBusMenuQt.cmake;fp=cmake%2Fmodules%2FFindDBusMenuQt.cmake;h=5af70ef2d0fa79b44c1748e24fddf6a81ab77fdc;hp=82673b7d5ac83d0d9fde7a48d6b4c8556a3c64d8;hb=60f0c29382823c31a8574d343e2c6fa2f919cb43;hpb=c7e04817ba6c5529d51292cb58cdd0c45666e6d3

diff --git a/cmake/modules/FindDBusMenuQt.cmake b/cmake/modules/FindDBusMenuQt.cmake
index 82673b7d..5af70ef2 100644
--- a/cmake/modules/FindDBusMenuQt.cmake
+++ b/cmake/modules/FindDBusMenuQt.cmake
@@ -1,10 +1,17 @@
 # - Try to find dbusmenu-qt
+# This module helps finding an installation of the DBusMenuQt library (see https://launchpad.net/libdbusmenu-qt/)
 # Once done this will define
 #
 #  DBUSMENUQT_FOUND - system has dbusmenu-qt
 #  DBUSMENUQT_INCLUDE_DIR - the dbusmenu-qt include directory
 #  DBUSMENUQT_LIBRARIES - the libraries needed to use dbusmenu-qt
 #  DBUSMENUQT_DEFINITIONS - Compiler switches required for using dbusmenu-qt
+#
+# The minimum required version of DBusMenuQt can be specified using the
+# standard syntax, e.g. find_package(DBusMenuQt 0.6)
+#
+# WARNING: versions below 0.4.0 cannot be checked for.
+# So if you want to have a version check, require at least 0.4.0 of dbusmenuqt.
 
 # Copyright (c) 2009, Canonical Ltd.
 # - Author: Aurélien Gâteau <aurelien.gateau@canonical.com>
@@ -19,6 +26,8 @@ include(FindPackageHandleStandardArgs)
 
 find_package(PkgConfig)
 pkg_check_modules(PC_DBUSMENUQT QUIET dbusmenu-qt)
+
+
 set(DBUSMENUQT_DEFINITIONS ${PC_DBUSMENUQT_CFLAGS_OTHER})
 
 find_library(DBUSMENUQT_LIBRARIES
@@ -31,6 +40,55 @@ find_path(DBUSMENUQT_INCLUDE_DIR dbusmenuexporter.h
     PATH_SUFFIXES dbusmenu-qt
     )
 
-find_package_handle_standard_args(DBusMenuQt "Could not find dbusmenu-qt; available at https://launchpad.net/libdbusmenu-qt/" DBUSMENUQT_LIBRARIES DBUSMENUQT_INCLUDE_DIR)
 
-mark_as_advanced(DBUSMENUQT_INCLUDE_DIR DBUSMENUQT_LIBRARIES)
+# dbusmenu_version.h is installed since 0.4.0, fail if a version below this is required:
+if ((DBusMenuQt_FIND_VERSION)  AND ("${DBusMenuQt_FIND_VERSION}" VERSION_LESS "0.4.0"))
+  message(FATAL_ERROR "Cannot check reliably for a DBusMenuQt version below 0.4.0 (${DBusMenuQt_FIND_VERSION} was requested)")
+endif ((DBusMenuQt_FIND_VERSION)  AND ("${DBusMenuQt_FIND_VERSION}" VERSION_LESS "0.4.0"))
+
+
+# find the version number from dbusmenu_version.h and store it in the cache
+if(DBUSMENUQT_INCLUDE_DIR  AND NOT DBUSMENUQT_VERSION)
+  # parse the version number out from dbusmenu_version:
+  if(EXISTS ${DBUSMENUQT_INCLUDE_DIR}/dbusmenu_version.h)
+    file(READ "${DBUSMENUQT_INCLUDE_DIR}/dbusmenu_version.h" DBUSMENUQT_VERSION_CONTENT)
+
+    if ("${DBUSMENUQT_VERSION_CONTENT}" MATCHES "DBUSMENUQT_VERSION_MAJOR") # introduced after 0.6.4, makes this code here more robust
+
+     string(REGEX MATCH "#define +DBUSMENUQT_VERSION_MAJOR +([0-9]+)"  _dummy "${DBUSMENUQT_VERSION_CONTENT}")
+     set(DBUSMENUQT_VERSION_MAJOR "${CMAKE_MATCH_1}")
+
+      string(REGEX MATCH "#define +DBUSMENUQT_VERSION_MINOR +([0-9]+)"  _dummy "${DBUSMENUQT_VERSION_CONTENT}")
+      set(DBUSMENUQT_VERSION_MINOR "${CMAKE_MATCH_1}")
+
+      string(REGEX MATCH "#define +DBUSMENUQT_VERSION_PATCH +([0-9]+)"  _dummy "${DBUSMENUQT_VERSION_CONTENT}")
+      set(DBUSMENUQT_VERSION_PATCH "${CMAKE_MATCH_1}")
+
+    else("${DBUSMENUQT_VERSION_CONTENT}" MATCHES "DBUSMENUQT_VERSION_MAJOR")
+      # In versions up to 0.6.4, the code for setting the version number in the header looked like
+      # shopw below. This made version checking quite un-obvious:
+      # #define DBUSMENUQT_VERSION \
+      #     ((0 << 16) \
+      #     |(6 << 8) \
+      #     |4)
+
+      string(REGEX MATCH "\\(\\( *([0-9]+) *<<"  _dummy "${DBUSMENUQT_VERSION_CONTENT}")
+      set(DBUSMENUQT_VERSION_MAJOR "${CMAKE_MATCH_1}")
+
+      string(REGEX MATCH "\\|\\( *([0-9]+) *<<"  _dummy "${DBUSMENUQT_VERSION_CONTENT}")
+      set(DBUSMENUQT_VERSION_MINOR "${CMAKE_MATCH_1}")
+
+      string(REGEX MATCH "\\| *([0-9]+) *\\)"  _dummy "${DBUSMENUQT_VERSION_CONTENT}")
+      set(DBUSMENUQT_VERSION_PATCH "${CMAKE_MATCH_1}")
+    endif("${DBUSMENUQT_VERSION_CONTENT}" MATCHES "DBUSMENUQT_VERSION_MAJOR")
+  endif(EXISTS ${DBUSMENUQT_INCLUDE_DIR}/dbusmenu_version.h)
+
+  set(DBUSMENUQT_VERSION "${DBUSMENUQT_VERSION_MAJOR}.${DBUSMENUQT_VERSION_MINOR}.${DBUSMENUQT_VERSION_PATCH}" CACHE STRING "Version number of DBusMenuQt" FORCE)
+endif(DBUSMENUQT_INCLUDE_DIR  AND NOT DBUSMENUQT_VERSION)
+
+
+find_package_handle_standard_args(DBusMenuQt REQUIRED_VARS DBUSMENUQT_LIBRARIES DBUSMENUQT_INCLUDE_DIR
+                                             VERSION_VAR DBUSMENUQT_VERSION)
+#"Could not find dbusmenu-qt; available at https://launchpad.net/libdbusmenu-qt/" DBUSMENUQT_LIBRARIES DBUSMENUQT_INCLUDE_DIR)
+
+mark_as_advanced(DBUSMENUQT_INCLUDE_DIR DBUSMENUQT_LIBRARIES DBUSMENUQT_VERSION)