The FindQt4 module of CMake insists on having uic, even if the QtGui
module isn't part of the requirements to build the program. This isn't
correct, as Qt doesn't build/install the uic program when QtGui is
disabled (uic is used to generate some UI code).

This has been fixed upstream in
http://cmake.org/gitweb?p=cmake.git;a=commit;h=43cb9b8276a70d153d56a69d5c61daaf2bc51b78. This
commit will be part of the upcoming 2.8.4 CMake release, but in the
mean time, let's include it in Buildroot.

From 43cb9b8276a70d153d56a69d5c61daaf2bc51b78 Mon Sep 17 00:00:00 2001
From: Clinton Stimpson <clinton@elemtech.com>
Date: Fri, 14 Jan 2011 21:26:19 -0700
Subject: [PATCH] Change to use fphsa to check required variables and version.

Also, set the required variables based on components, if specified.
Also, don't make finding uic required if not using QtGui.
---
 Modules/FindQt4.cmake |  179 +++++++++++++------------------------------------
 1 files changed, 46 insertions(+), 133 deletions(-)

diff --git a/Modules/FindQt4.cmake b/Modules/FindQt4.cmake
index d9d6ea7..70e69b0 100644
--- a/Modules/FindQt4.cmake
+++ b/Modules/FindQt4.cmake
@@ -9,7 +9,7 @@
 # QT_LIBRARIES variable.
 #
 # Typical usage could be something like:
-#   find_package(Qt4 4.4.3 COMPONENTS QtCore QtGui QtXml REQUIRED )
+#   find_package(Qt4 4.4.3 REQUIRED QtCore QtGui QtXml)
 #   include(${QT_USE_FILE})
 #   add_executable(myexe main.cpp)
 #   target_link_libraries(myexe ${QT_LIBRARIES})
@@ -354,6 +354,7 @@ ENDIF(QT_QT_LIBRARY)
 
 INCLUDE(CheckSymbolExists)
 INCLUDE(MacroAddFileDependencies)
+INCLUDE(FindPackageHandleStandardArgs)
 
 SET(QT_USE_FILE ${CMAKE_ROOT}/Modules/UseQt4.cmake)
 
@@ -469,6 +470,7 @@ FIND_PROGRAM(QT_QMAKE_EXECUTABLE NAMES qmake qmake4 qmake-qt4 qmake-mac PATHS
   DOC "The qmake executable for the Qt installation to use"
 )
 
+# double check that it was a Qt4 qmake, if not, re-find with different names
 IF (QT_QMAKE_EXECUTABLE)
 
   IF(QT_QMAKE_EXECUTABLE_LAST)
@@ -477,8 +479,6 @@ IF (QT_QMAKE_EXECUTABLE)
 
   SET(QT_QMAKE_EXECUTABLE_LAST "${QT_QMAKE_EXECUTABLE}" CACHE INTERNAL "" FORCE)
 
-  SET(QT4_QMAKE_FOUND FALSE)
-  
   _qt4_query_qmake(QT_VERSION QTVERSION)
 
   # check for qt3 qmake and then try and find qmake4 or qmake-qt4 in the path
@@ -495,74 +495,9 @@ IF (QT_QMAKE_EXECUTABLE)
     ENDIF(QT_QMAKE_EXECUTABLE)
   ENDIF(NOT QTVERSION)
 
-  # check that we found the Qt4 qmake, Qt3 qmake output won't match here
-  STRING(REGEX MATCH "^[0-9]+\\.[0-9]+\\.[0-9]+" qt_version_tmp "${QTVERSION}")
-  IF (qt_version_tmp)
-
-    # we need at least version 4.0.0
-    IF (NOT QT_MIN_VERSION)
-      SET(QT_MIN_VERSION "4.0.0")
-    ENDIF (NOT QT_MIN_VERSION)
-
-    #now parse the parts of the user given version string into variables
-    STRING(REGEX MATCH "^[0-9]+\\.[0-9]+\\.[0-9]+" req_qt_major_vers "${QT_MIN_VERSION}")
-    IF (NOT req_qt_major_vers)
-      MESSAGE( FATAL_ERROR "Invalid Qt version string given: \"${QT_MIN_VERSION}\", expected e.g. \"4.0.1\"")
-    ENDIF (NOT req_qt_major_vers)
-
-    # now parse the parts of the user given version string into variables
-    STRING(REGEX REPLACE "^([0-9]+)\\.[0-9]+\\.[0-9]+" "\\1" req_qt_major_vers "${QT_MIN_VERSION}")
-    STRING(REGEX REPLACE "^[0-9]+\\.([0-9])+\\.[0-9]+" "\\1" req_qt_minor_vers "${QT_MIN_VERSION}")
-    STRING(REGEX REPLACE "^[0-9]+\\.[0-9]+\\.([0-9]+)" "\\1" req_qt_patch_vers "${QT_MIN_VERSION}")
-
-    # Suppport finding at least a particular version, for instance FIND_PACKAGE( Qt4 4.4.3 )
-    # This implementation is a hack to avoid duplicating code and make sure we stay
-    # source-compatible with CMake 2.6.x
-    IF( Qt4_FIND_VERSION )
-      SET( QT_MIN_VERSION ${Qt4_FIND_VERSION} )
-      SET( req_qt_major_vers ${Qt4_FIND_VERSION_MAJOR} )
-      SET( req_qt_minor_vers ${Qt4_FIND_VERSION_MINOR} )
-      SET( req_qt_patch_vers ${Qt4_FIND_VERSION_PATCH} )
-    ENDIF( Qt4_FIND_VERSION )
-
-    IF (NOT req_qt_major_vers EQUAL 4)
-      MESSAGE( FATAL_ERROR "Invalid Qt version string given: \"${QT_MIN_VERSION}\", major version 4 is required, e.g. \"4.0.1\"")
-    ENDIF (NOT req_qt_major_vers EQUAL 4)
-
-    # and now the version string given by qmake
-    STRING(REGEX REPLACE "^([0-9]+)\\.[0-9]+\\.[0-9]+.*" "\\1" QT_VERSION_MAJOR "${QTVERSION}")
-    STRING(REGEX REPLACE "^[0-9]+\\.([0-9])+\\.[0-9]+.*" "\\1" QT_VERSION_MINOR "${QTVERSION}")
-    STRING(REGEX REPLACE "^[0-9]+\\.[0-9]+\\.([0-9]+).*" "\\1" QT_VERSION_PATCH "${QTVERSION}")
-
-    # compute an overall version number which can be compared at once
-    MATH(EXPR req_vers "${req_qt_major_vers}*10000 + ${req_qt_minor_vers}*100 + ${req_qt_patch_vers}")
-    MATH(EXPR found_vers "${QT_VERSION_MAJOR}*10000 + ${QT_VERSION_MINOR}*100 + ${QT_VERSION_PATCH}")
-
-    # Support finding *exactly* a particular version, for instance FIND_PACKAGE( Qt4 4.4.3 EXACT )
-    IF( Qt4_FIND_VERSION_EXACT )
-      IF(found_vers EQUAL req_vers)
-        SET( QT4_QMAKE_FOUND TRUE )
-      ELSE(found_vers EQUAL req_vers)
-        SET( QT4_QMAKE_FOUND FALSE )
-        IF (found_vers LESS req_vers)
-          SET(QT4_INSTALLED_VERSION_TOO_OLD TRUE)
-        ELSE (found_vers LESS req_vers)
-          SET(QT4_INSTALLED_VERSION_TOO_NEW TRUE)
-        ENDIF (found_vers LESS req_vers)
-      ENDIF(found_vers EQUAL req_vers)
-    ELSE( Qt4_FIND_VERSION_EXACT )
-      IF (found_vers LESS req_vers)
-        SET(QT4_QMAKE_FOUND FALSE)
-        SET(QT4_INSTALLED_VERSION_TOO_OLD TRUE)
-      ELSE (found_vers LESS req_vers)
-        SET(QT4_QMAKE_FOUND TRUE)
-      ENDIF (found_vers LESS req_vers)
-    ENDIF( Qt4_FIND_VERSION_EXACT )
-  ENDIF (qt_version_tmp)
-
 ENDIF (QT_QMAKE_EXECUTABLE)
 
-IF (QT4_QMAKE_FOUND)
+IF (QT_QMAKE_EXECUTABLE AND QTVERSION)
 
   # ask qmake for the mkspecs directory
   # we do this first because QT_LIBINFIX might be set
@@ -1072,32 +1007,7 @@ IF (QT4_QMAKE_FOUND)
   # get the directory of the current file, used later on in the file
   GET_FILENAME_COMPONENT( _qt4_current_dir  "${CMAKE_CURRENT_LIST_FILE}" PATH)
 
-  ######################################
-  #
-  #       decide if Qt got found
-  #
-  ######################################
-
-  # if the includes,libraries,moc,uic and rcc are found then we have it
-  IF( QT_LIBRARY_DIR AND QT_INCLUDE_DIR AND QT_MOC_EXECUTABLE AND 
-      QT_UIC_EXECUTABLE AND QT_RCC_EXECUTABLE AND QT_QTCORE_LIBRARY)
-    SET( QT4_FOUND "YES" )
-    INCLUDE(FindPackageMessage)
-    FIND_PACKAGE_MESSAGE(Qt4 "Found Qt-Version ${QTVERSION} (using ${QT_QMAKE_EXECUTABLE})"
-      "[${QT_LIBRARY_DIR}][${QT_INCLUDE_DIR}][${QT_MOC_EXECUTABLE}][${QT_UIC_EXECUTABLE}][${QT_RCC_EXECUTABLE}]")
-  ELSE( QT_LIBRARY_DIR AND QT_INCLUDE_DIR AND QT_MOC_EXECUTABLE AND
-        QT_UIC_EXECUTABLE AND QT_RCC_EXECUTABLE AND QT_QTCORE_LIBRARY)
-    SET( QT4_FOUND "NO")
-    SET(QT_QMAKE_EXECUTABLE "${QT_QMAKE_EXECUTABLE}-NOTFOUND" CACHE FILEPATH "Invalid qmake found" FORCE)
-    IF( Qt4_FIND_REQUIRED)
-      MESSAGE( FATAL_ERROR "Qt libraries, includes, moc, uic or/and rcc NOT found!")
-    ENDIF( Qt4_FIND_REQUIRED)
-  ENDIF( QT_LIBRARY_DIR AND QT_INCLUDE_DIR AND QT_MOC_EXECUTABLE AND 
-         QT_UIC_EXECUTABLE AND  QT_RCC_EXECUTABLE AND QT_QTCORE_LIBRARY)
   
-  SET(QT_FOUND ${QT4_FOUND})
-
-
   ###############################################
   #
   #       configuration/system dependent settings  
@@ -1189,44 +1099,47 @@ IF (QT4_QMAKE_FOUND)
 
   INCLUDE("${_qt4_current_dir}/Qt4Macros.cmake")
 
+ENDIF(QT_QMAKE_EXECUTABLE AND QTVERSION)
 
-  #######################################
-  #
-  #       compatibility settings 
-  #
-  #######################################
-  # Backwards compatibility for CMake1.4 and 1.2
-  SET (QT_MOC_EXE ${QT_MOC_EXECUTABLE} )
-  SET (QT_UIC_EXE ${QT_UIC_EXECUTABLE} )
-
-  SET( QT_QT_LIBRARY "")
-
-ELSE(QT4_QMAKE_FOUND)
-   
-   SET(QT_QMAKE_EXECUTABLE "${QT_QMAKE_EXECUTABLE}-NOTFOUND" CACHE FILEPATH "Invalid qmake found" FORCE)
-   
-   # The code below is overly complex to make sure we do not break compatibility with CMake 2.6.x
-   # For CMake 2.8, it should be simplified by getting rid of QT4_INSTALLED_VERSION_TOO_OLD and 
-   # QT4_INSTALLED_VERSION_TOO_NEW
-   IF(Qt4_FIND_REQUIRED)
-      IF(QT4_INSTALLED_VERSION_TOO_OLD)
-    IF( Qt4_FIND_VERSION_EXACT )
-      MESSAGE(FATAL_ERROR "The installed Qt version ${QTVERSION} is too old, version ${QT_MIN_VERSION} is required")
-    ELSE( Qt4_FIND_VERSION_EXACT )
-      MESSAGE(FATAL_ERROR "The installed Qt version ${QTVERSION} is too old, at least version ${QT_MIN_VERSION} is required")
-    ENDIF( Qt4_FIND_VERSION_EXACT )
-      ELSE(QT4_INSTALLED_VERSION_TOO_OLD)
-      IF( Qt4_FIND_VERSION_EXACT AND QT4_INSTALLED_VERSION_TOO_NEW )
-      MESSAGE(FATAL_ERROR "The installed Qt version ${QTVERSION} is too new, version ${QT_MIN_VERSION} is required")
-    ELSE( Qt4_FIND_VERSION_EXACT AND QT4_INSTALLED_VERSION_TOO_NEW )
-      MESSAGE( FATAL_ERROR "Qt qmake not found!")
-    ENDIF( Qt4_FIND_VERSION_EXACT AND QT4_INSTALLED_VERSION_TOO_NEW )
-      ENDIF(QT4_INSTALLED_VERSION_TOO_OLD)
-   ELSE(Qt4_FIND_REQUIRED)
-      IF(QT4_INSTALLED_VERSION_TOO_OLD AND NOT Qt4_FIND_QUIETLY)
-         MESSAGE(STATUS "The installed Qt version ${QTVERSION} is too old, at least version ${QT_MIN_VERSION} is required")
-      ENDIF(QT4_INSTALLED_VERSION_TOO_OLD AND NOT Qt4_FIND_QUIETLY)
-   ENDIF(Qt4_FIND_REQUIRED)
- 
-ENDIF (QT4_QMAKE_FOUND)
+#support old QT_MIN_VERSION if set, but not if version is supplied by find_package()
+IF(NOT Qt4_FIND_VERSION AND QT_MIN_VERSION)
+  SET(Qt4_FIND_VERSION ${QT_MIN_VERSION})
+ENDIF(NOT Qt4_FIND_VERSION AND QT_MIN_VERSION)
+
+IF( Qt4_FIND_COMPONENTS )
+
+  # if components specified in find_package(), make sure each of those pieces were found
+  SET(_QT4_FOUND_REQUIRED_VARS QT_QMAKE_EXECUTABLE QT_MOC_EXECUTABLE QT_RCC_EXECUTABLE QT_INCLUDE_DIR QT_LIBRARY_DIR)
+  FOREACH( component ${Qt4_FIND_COMPONENTS} )
+    STRING( TOUPPER ${component} _COMPONENT )
+    SET(_QT4_FOUND_REQUIRED_VARS ${_QT4_FOUND_REQUIRED_VARS} QT_${_COMPONENT}_INCLUDE_DIR QT_${_COMPONENT}_LIBRARY)
+  ENDFOREACH( component )
+
+  if(Qt4_FIND_COMPONENTS MATCHES QtGui)
+    SET(_QT4_FOUND_REQUIRED_VARS ${_QT4_FOUND_REQUIRED_VARS} QT_UIC_EXECUTABLE)
+  endif(Qt4_FIND_COMPONENTS MATCHES QtGui)
+
+ELSE( Qt4_FIND_COMPONENTS )
+
+  # if no components specified, we'll make a default set of required variables to say Qt is found
+  SET(_QT4_FOUND_REQUIRED_VARS QT_QMAKE_EXECUTABLE QT_MOC_EXECUTABLE QT_RCC_EXECUTABLE QT_UIC_EXECUTABLE QT_INCLUDE_DIR
+    QT_LIBRARY_DIR QT_QTCORE_LIBRARY)
+
+ENDIF( Qt4_FIND_COMPONENTS )
+
+FIND_PACKAGE_HANDLE_STANDARD_ARGS(Qt4
+  REQUIRED_VARS ${_QT4_FOUND_REQUIRED_VARS}
+  VERSION_VAR QTVERSION
+  )
+
+#######################################
+#
+#       compatibility settings
+#
+#######################################
+# Backwards compatibility for CMake1.4 and 1.2
+SET (QT_MOC_EXE ${QT_MOC_EXECUTABLE} )
+SET (QT_UIC_EXE ${QT_UIC_EXECUTABLE} )
+SET( QT_QT_LIBRARY "")
+SET(QT_FOUND ${QT4_FOUND})
 
-- 
1.7.0