Remove CMake code for CMake < 3.1

This removes the following functions from Qt5CoreMacros:
- qt5_use_modules(...)

Task-number: QTBUG-63519
Change-Id: I59769060a3a93686bf319b558c0ede55755fdb70
Reviewed-by: David Faure <david.faure@kdab.com>

3 files changed, 5 insertions, 79 deletions

diff --git a/src/corelib/Qt5Config.cmake.in b/src/corelib/Qt5Config.cmake.in
index 75b53485b7..6b6544f932 100644
--- a/src/corelib/Qt5Config.cmake.in
+++ b/src/corelib/Qt5Config.cmake.in
@@ -1,6 +1,6 @@
 
-if (CMAKE_VERSION VERSION_LESS 2.8.9)
-    message(FATAL_ERROR \"Qt5 requires at least CMake version 2.8.9\")
+if (CMAKE_VERSION VERSION_LESS 3.1.0)
+    message(FATAL_ERROR \"Qt5 requires at least CMake version 3.1.0\")
 endif()
 
 if (NOT Qt5_FIND_COMPONENTS)
diff --git a/src/corelib/Qt5CoreConfigExtras.cmake.in b/src/corelib/Qt5CoreConfigExtras.cmake.in
index 545b9a3d1e..e0652fdcf9 100644
--- a/src/corelib/Qt5CoreConfigExtras.cmake.in
+++ b/src/corelib/Qt5CoreConfigExtras.cmake.in
@@ -78,27 +78,10 @@ set(Qt5_POSITION_INDEPENDENT_CODE True)
 # Applications now need to be compiled with the -fPIC option if the Qt option
 # \"reduce relocations\" is active. For backward compatibility only, Qt accepts
 # the use of -fPIE for GCC 4.x versions.
-if (CMAKE_VERSION VERSION_LESS 2.8.12
-        AND (NOT CMAKE_CXX_COMPILER_ID STREQUAL \"GNU\"
-        OR CMAKE_CXX_COMPILER_VERSION VERSION_LESS 5.0))
-    set_property(TARGET Qt5::Core APPEND PROPERTY INTERFACE_POSITION_INDEPENDENT_CODE \"ON\")
-else()
-    set_property(TARGET Qt5::Core APPEND PROPERTY INTERFACE_COMPILE_OPTIONS $$QMAKE_CXXFLAGS_APP)
-endif()
+set_property(TARGET Qt5::Core APPEND PROPERTY INTERFACE_COMPILE_OPTIONS $$QMAKE_CXXFLAGS_APP)
 
-# Applications using qmake or cmake >= 2.8.12 as their build system will
-# adapt automatically. Applications using an older release of cmake in
-# combination with GCC 5.x need to change their CMakeLists.txt to add
-# Qt5Core_EXECUTABLE_COMPILE_FLAGS to CMAKE_CXX_FLAGS. In particular,
-# applications using cmake >= 2.8.9 and < 2.8.11 will continue to build
-# with the -fPIE option and invoke the special compatibility mode if using
-# GCC 4.x.
+# TODO Qt6: Remove
 set(Qt5Core_EXECUTABLE_COMPILE_FLAGS \"\")
-if (CMAKE_VERSION VERSION_LESS 2.8.12
-        AND (CMAKE_CXX_COMPILER_ID STREQUAL \"GNU\"
-        AND NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 5.0))
-    set(Qt5Core_EXECUTABLE_COMPILE_FLAGS \"-fPIC\")
-endif()
 
 !!IF !isEmpty(QT_NAMESPACE)
 list(APPEND Qt5Core_DEFINITIONS -DQT_NAMESPACE=$$QT_NAMESPACE)
@@ -157,7 +140,7 @@ if (NOT TARGET Qt5::WinMain)
     )
 !!ENDIF
 
-    if (NOT CMAKE_VERSION VERSION_LESS 2.8.11 AND NOT Qt5_NO_LINK_QTMAIN)
+    if (NOT Qt5_NO_LINK_QTMAIN)
         set(_isExe $<STREQUAL:$<TARGET_PROPERTY:TYPE>,EXECUTABLE>)
         set(_isWin32 $<BOOL:$<TARGET_PROPERTY:WIN32_EXECUTABLE>>)
         set(_isNotExcluded $<NOT:$<BOOL:$<TARGET_PROPERTY:Qt5_NO_LINK_QTMAIN>>>)
diff --git a/src/corelib/Qt5CoreMacros.cmake b/src/corelib/Qt5CoreMacros.cmake
index 8d3dbe3ecf..1627de4002 100644
--- a/src/corelib/Qt5CoreMacros.cmake
+++ b/src/corelib/Qt5CoreMacros.cmake
@@ -152,9 +152,6 @@ function(QT5_GENERATE_MOC infile outfile )
         set(_outfile "${CMAKE_CURRENT_BINARY_DIR}/${outfile}")
     endif()
     if ("x${ARGV2}" STREQUAL "xTARGET")
-        if (CMAKE_VERSION VERSION_LESS 2.8.12)
-            message(FATAL_ERROR "The TARGET parameter to qt5_generate_moc is only available when using CMake 2.8.12 or later.")
-        endif()
         set(moc_target ${ARGV3})
     endif()
     qt5_create_moc_command(${abs_infile} ${_outfile} "${moc_flags}" "" "${moc_target}" "")
@@ -178,9 +175,6 @@ function(QT5_WRAP_CPP outfiles )
     set(moc_target ${_WRAP_CPP_TARGET})
     set(moc_depends ${_WRAP_CPP_DEPENDS})
 
-    if (moc_target AND CMAKE_VERSION VERSION_LESS 2.8.12)
-        message(FATAL_ERROR "The TARGET parameter to qt5_wrap_cpp is only available when using CMake 2.8.12 or later.")
-    endif()
     foreach(it ${moc_files})
         get_filename_component(it ${it} ABSOLUTE)
         qt5_make_output_file(${it} moc_ cpp outfile)
@@ -300,54 +294,3 @@ function(QT5_ADD_RESOURCES outfiles )
 endfunction()
 
 set(_Qt5_COMPONENT_PATH "${CMAKE_CURRENT_LIST_DIR}/..")
-
-if (NOT CMAKE_VERSION VERSION_LESS 2.8.9)
-    macro(qt5_use_modules _target _link_type)
-        if(NOT CMAKE_MINIMUM_REQUIRED_VERSION VERSION_LESS 2.8.11)
-            if(CMAKE_WARN_DEPRECATED)
-                set(messageType WARNING)
-            endif()
-            if(CMAKE_ERROR_DEPRECATED)
-                set(messageType FATAL_ERROR)
-            endif()
-            if(messageType)
-                message(${messageType} "The qt5_use_modules macro is obsolete. Use target_link_libraries with IMPORTED targets instead.")
-            endif()
-        endif()
-
-        if (NOT TARGET ${_target})
-            message(FATAL_ERROR "The first argument to qt5_use_modules must be an existing target.")
-        endif()
-        if ("${_link_type}" STREQUAL "LINK_PUBLIC" OR "${_link_type}" STREQUAL "LINK_PRIVATE" )
-            set(_qt5_modules ${ARGN})
-            set(_qt5_link_type ${_link_type})
-        else()
-            set(_qt5_modules ${_link_type} ${ARGN})
-        endif()
-
-        if ("${_qt5_modules}" STREQUAL "")
-            message(FATAL_ERROR "qt5_use_modules requires at least one Qt module to use.")
-        endif()
-
-        foreach(_module ${_qt5_modules})
-            if (NOT Qt5${_module}_FOUND)
-                find_package(Qt5${_module} PATHS "${_Qt5_COMPONENT_PATH}" NO_DEFAULT_PATH)
-                if (NOT Qt5${_module}_FOUND)
-                    message(FATAL_ERROR "Can not use \"${_module}\" module which has not yet been found.")
-                endif()
-            endif()
-            target_link_libraries(${_target} ${_qt5_link_type} ${Qt5${_module}_LIBRARIES})
-            set_property(TARGET ${_target} APPEND PROPERTY INCLUDE_DIRECTORIES ${Qt5${_module}_INCLUDE_DIRS})
-            set_property(TARGET ${_target} APPEND PROPERTY COMPILE_DEFINITIONS ${Qt5${_module}_COMPILE_DEFINITIONS})
-            set_property(TARGET ${_target} APPEND PROPERTY COMPILE_DEFINITIONS_RELEASE QT_NO_DEBUG)
-            set_property(TARGET ${_target} APPEND PROPERTY COMPILE_DEFINITIONS_RELWITHDEBINFO QT_NO_DEBUG)
-            set_property(TARGET ${_target} APPEND PROPERTY COMPILE_DEFINITIONS_MINSIZEREL QT_NO_DEBUG)
-            if (Qt5_POSITION_INDEPENDENT_CODE
-                    AND (CMAKE_VERSION VERSION_LESS 2.8.12
-                        AND (NOT CMAKE_CXX_COMPILER_ID STREQUAL "GNU"
-                        OR CMAKE_CXX_COMPILER_VERSION VERSION_LESS 5.0)))
-                set_property(TARGET ${_target} PROPERTY POSITION_INDEPENDENT_CODE ${Qt5_POSITION_INDEPENDENT_CODE})
-            endif()
-        endforeach()
-    endmacro()
-endif()