BUG: fix #7447, FindModulesExecuteAll test fails if both Qt3 and KDE4 can be

found in the system

Qt3 and Qt4 cannot be used together in one project.
Now Qt3/KDE3 and Qt4/KDE4 handle the case that this is done nevertheless
properly, i.e. they fail with FATAL_ERROR if it was REQUIRED and they fail
with just MESSAGE(STATUS ...) and RETURN() if it was not REQUIRED

BUG: make FindQt4 error out with FATAL_ERROR also if it was searched QUIET

Alex

Modules/FindKDE3.cmake

@@ -67,6 +67,18 @@ IF(NOT UNIX AND KDE3_FIND_REQUIRED)
    MESSAGE(FATAL_ERROR "Compiling KDE3 applications and libraries under Windows is not supported")
 ENDIF(NOT UNIX AND KDE3_FIND_REQUIRED)
 
+# If Qt4 has already been found, fail.
+IF(QT4_FOUND)
+  IF(KDE3_FIND_REQUIRED)
+    MESSAGE( FATAL_ERROR "KDE3/Qt3 and Qt4 cannot be used together in one project.")
+  ELSE(KDE3_FIND_REQUIRED)
+    IF(NOT KDE3_FIND_QUIETLY)
+      MESSAGE( STATUS    "KDE3/Qt3 and Qt4 cannot be used together in one project.")
+    ENDIF(NOT KDE3_FIND_QUIETLY)
+    RETURN()
+  ENDIF(KDE3_FIND_REQUIRED)
+ENDIF(QT4_FOUND)
+
 
 SET(QT_MT_REQUIRED TRUE)
 #SET(QT_MIN_VERSION "3.0.0")

Modules/FindKDE4.cmake

@@ -9,6 +9,18 @@
 #
 # Author: Alexander Neundorf <neundorf@kde.org>
 
+# If Qt3 has already been found, fail.
+IF(QT_QT_LIBRARY)
+  IF(KDE4_FIND_REQUIRED)
+    MESSAGE( FATAL_ERROR "KDE4/Qt4 and Qt3 cannot be used together in one project.")
+  ELSE(KDE4_FIND_REQUIRED)
+    IF(NOT KDE4_FIND_QUIETLY)
+      MESSAGE( STATUS    "KDE4/Qt4 and Qt3 cannot be used together in one project.")
+    ENDIF(NOT KDE_FIND_QUIETLY)
+    RETURN()
+  ENDIF(KDE4_FIND_REQUIRED)
+ENDIF(QT_QTCORE_LIBRARY)
+
 FILE(TO_CMAKE_PATH "$ENV{KDEDIRS}" _KDEDIRS)
 
 # when cross compiling, searching kde4-config in order to run it later on

Modules/FindQt3.cmake

@@ -20,6 +20,19 @@
 #  QT_WRAP_CPP, set true if QT_MOC_EXECUTABLE is found
 #  QT_WRAP_UI set true if QT_UIC_EXECUTABLE is found
 
+# If Qt4 has already been found, fail.
+IF(QT4_FOUND)
+  IF(Qt3_FIND_REQUIRED)
+    MESSAGE( FATAL_ERROR "Qt3 and Qt4 cannot be used together in one project.")
+  ELSE(Qt3_FIND_REQUIRED)
+    IF(NOT Qt3_FIND_QUIETLY)
+      MESSAGE( STATUS    "Qt3 and Qt4 cannot be used together in one project.")
+    ENDIF(NOT Qt3_FIND_QUIETLY)
+    RETURN()
+  ENDIF(Qt3_FIND_REQUIRED)
+ENDIF(QT4_FOUND)
+
+
 FILE(GLOB GLOB_PATHS_BIN /usr/lib/qt-3*/bin/)
 FIND_PATH(QT_INCLUDE_DIR qt.h
   "[HKEY_CURRENT_USER\\Software\\Trolltech\\Qt3Versions\\3.2.1;InstallDir]/include/Qt"
@@ -39,7 +52,7 @@ FIND_PATH(QT_INCLUDE_DIR qt.h
 # if qglobal.h is not in the qt_include_dir then set
 # QT_INCLUDE_DIR to NOTFOUND
 IF(NOT EXISTS ${QT_INCLUDE_DIR}/qglobal.h)
-  SET(QT_INCLUDE_DIR QT_INCLUDE_DIR-NOTFOUND CACHE PATH "path to qt3 include directory" FORCE)
+  SET(QT_INCLUDE_DIR QT_INCLUDE_DIR-NOTFOUND CACHE PATH "path to Qt3 include directory" FORCE)
 ENDIF(NOT EXISTS ${QT_INCLUDE_DIR}/qglobal.h)
 
 IF(QT_INCLUDE_DIR)
@@ -51,7 +64,6 @@ IF(QT_INCLUDE_DIR)
   # Under windows the qt library (MSVC) has the format qt-mtXYZ where XYZ is the
   # version X.Y.Z, so we need to remove the dots from version
   STRING(REGEX REPLACE "\\." "" qt_version_str_lib "${qt_version_str}")
-ELSE(QT_INCLUDE_DIR)
 ENDIF(QT_INCLUDE_DIR)
 
 FILE(GLOB GLOB_PATHS_LIB /usr/lib/qt-3*/lib/)

Modules/FindQt4.cmake

@@ -256,6 +256,19 @@
 # (They make no sense in Qt4)
 #  QT_QT_LIBRARY        Qt-Library is now split
 
+# If Qt3 has already been found, fail.
+IF(QT_QT_LIBRARY)
+  IF(Qt4_FIND_REQUIRED)
+    MESSAGE( FATAL_ERROR "Qt3 and Qt4 cannot be used together in one project.")
+  ELSE(Qt4_FIND_REQUIRED)
+    IF(NOT Qt4_FIND_QUIETLY)
+      MESSAGE( STATUS    "Qt3 and Qt4 cannot be used together in one project.")
+    ENDIF(NOT Qt4_FIND_QUIETLY)
+    RETURN()
+  ENDIF(Qt4_FIND_REQUIRED)
+ENDIF(QT_QTCORE_LIBRARY)
+
+
 INCLUDE(CheckSymbolExists)
 INCLUDE(MacroAddFileDependencies)
 
@@ -474,9 +487,9 @@ IF (QT4_QMAKE_FOUND)
   ENDIF( QT_QTCORE_INCLUDE_DIR AND NOT QT_INCLUDE_DIR)
 
   IF( NOT QT_INCLUDE_DIR)
-    IF( NOT Qt4_FIND_QUIETLY AND Qt4_FIND_REQUIRED)
+    IF(Qt4_FIND_REQUIRED)
       MESSAGE( FATAL_ERROR "Could NOT find QtGlobal header")
-    ENDIF( NOT Qt4_FIND_QUIETLY AND Qt4_FIND_REQUIRED)
+    ENDIF(Qt4_FIND_REQUIRED)
   ENDIF( NOT QT_INCLUDE_DIR)
 
   #############################################
@@ -771,9 +784,9 @@ IF (QT4_QMAKE_FOUND)
       ENDIF(EXISTS ${QT_LIBRARY_DIR}/libqtmain.a)
     ENDIF(QT_LIBRARY_DIR AND MSVC)
 
-    IF( NOT Qt4_FIND_QUIETLY AND Qt4_FIND_REQUIRED)
+    IF(Qt4_FIND_REQUIRED)
       MESSAGE( FATAL_ERROR "Could NOT find QtCore. Check ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log for more details.")
-    ENDIF( NOT Qt4_FIND_QUIETLY AND Qt4_FIND_REQUIRED)
+    ENDIF(Qt4_FIND_REQUIRED)
   ENDIF( NOT QT_QTCORE_LIBRARY_DEBUG AND NOT QT_QTCORE_LIBRARY_RELEASE )
 
   # Set QT_QTASSISTANT_LIBRARY