CMake: Port the 'static_runtime' feature

This feature is Windows-only and must be turned on manually.
For MSVC it sets the MSVC_RUNTIME_LIBRARY target property.
For MinGW it adds the -static linker flag.

Change-Id: I9da3b88d545b34bc34a3a80301b2dd1b5986fa88
Reviewed-by: Leander Beernaert <leander.beernaert@qt.io>
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>

cmake/QtBuild.cmake

@@ -1830,6 +1830,19 @@ endfunction()
 
 variable_watch(CMAKE_CURRENT_LIST_DIR qt_watch_current_list_dir)
 
+# Set target properties that are the same for all modules, plugins, executables
+# and 3rdparty libraries.
+function(qt_set_common_target_properties target)
+   if(FEATURE_static_runtime)
+       if(MSVC)
+           set_property(TARGET ${target} PROPERTY
+               MSVC_RUNTIME_LIBRARY "MultiThreaded$<$<CONFIG:Debug>:Debug>")
+       elseif(MINGW)
+           target_link_options(${target} INTERFACE "LINKER:-static")
+       endif()
+   endif()
+endfunction()
+
 # This is the main entry function for creating a Qt module, that typically
 # consists of a library, public header files, private header files and configurable
 # features.
@@ -1870,6 +1883,10 @@ function(qt_add_module target)
         add_library("${target}" STATIC)
     endif()
 
+    if(NOT is_interface_lib)
+        qt_set_common_target_properties(${target})
+    endif()
+
     set(is_framework 0)
     if(QT_FEATURE_framework AND NOT ${arg_HEADER_MODULE} AND NOT ${arg_STATIC})
         set(is_framework 1)
@@ -2739,6 +2756,8 @@ function(qt_internal_add_plugin target)
         endif()
     endif()
 
+    qt_set_common_target_properties(${target})
+
     # Make sure the Qt6 plugin library names are like they were in Qt5 qmake land.
     # Whereas the Qt6 CMake target names are like the Qt5 CMake target names.
     set(output_name "${target}")
@@ -3039,6 +3058,7 @@ function(qt_add_executable name)
         qt6_generate_win32_rc_file(${name})
     endif()
 
+    qt_set_common_target_properties(${name})
     qt_autogen_tools_initial_setup(${name})
     qt_skip_warnings_are_errors_when_repo_unclean("${name}")
 
@@ -3522,6 +3542,10 @@ function(qt_add_3rdparty_library target)
         add_library("${target}")
     endif()
 
+    if(NOT arg_INTERFACE)
+        qt_set_common_target_properties(${target})
+    endif()
+
     if (NOT arg_ARCHIVE_INSTALL_DIRECTORY AND arg_INSTALL_DIRECTORY)
         set(arg_ARCHIVE_INSTALL_DIRECTORY "${arg_INSTALL_DIRECTORY}")
     endif()

configure.cmake

@@ -794,6 +794,14 @@ qt_feature("ccache"
     CONDITION QT_USE_CCACHE
 )
 qt_feature_config("ccache" QMAKE_PRIVATE_CONFIG)
+qt_feature("static_runtime"
+    LABEL "Statically link the C/C++ runtime library"
+    AUTODETECT OFF
+    CONDITION NOT QT_FEATURE_shared
+    EMIT_IF WIN32
+)
+qt_feature_config("static_runtime" QMAKE_PUBLIC_CONFIG)
+qt_feature_config("static_runtime" QMAKE_PUBLIC_QT_CONFIG)
 qt_feature("dlopen" PRIVATE
     LABEL "dlopen()"
     CONDITION UNIX

util/cmake/configurejson2cmake.py

@@ -907,7 +907,6 @@ def get_feature_mapping():
         },
         "silent": None,
         "sql-sqlite": {"condition": "QT_FEATURE_datestring"},
-        "static_runtime": None,
         "stl": None,  # Do we really need to test for this in 2018?!
         "strip": None,
         "sun-libiconv": {