Disable debug-and-release builds for MinGW

The requirement to separate debug and release DLLs on Windows stems from
the Visual Studio C run-time library appearing in two different variants
(debug and release) and not mixing well. It's possible to perform builds
without optimzations and with debug symbols while linking against the
release version of the C run-time, but at the same time the debug
version of the run-time brings other developer visible advantages.

MinGW on the other hand does not have this distinction, does not ship
with separate DLLS and does also not require the VS C runtime library.
Therefore we do not need this separation for MinGW, which means that our
packages can be reduced in size and application developers wishing to
debug their applications do not have to use debug builds of the Qt
libraries or run into Qt internal debug code.

Task-number: QTBUG-78445
Change-Id: Idf588606091298dc44262c4c89e689df18d34747
Reviewed-by: Cristian Adam <cristian.adam@qt.io>
Reviewed-by: Jörg Bornemann <joerg.bornemann@qt.io>

configure.json

@@ -766,7 +766,7 @@
         "debug_and_release": {
             "label": "Compile libs in debug and release mode",
             "autoDetect": "input.debug == ''",
-            "condition": "config.darwin || config.win32",
+            "condition": "config.darwin || (config.win32 && !config.gcc)",
             "output": [ "publicFeature", "publicQtConfig", "debugAndRelease" ]
         },
         "force_debug_info": {

mkspecs/common/g++-win32.conf

@@ -17,7 +17,7 @@ include(g++-base.conf)
 
 MAKEFILE_GENERATOR      = MINGW
 QMAKE_PLATFORM          = win32 mingw
-CONFIG                 += debug_and_release debug_and_release_target precompile_header
+CONFIG                 += precompile_header
 DEFINES                += UNICODE _UNICODE WIN32 MINGW_HAS_SECURE_API=1
 QMAKE_COMPILER_DEFINES += __GNUC__ _WIN32
 # can't add 'DEFINES += WIN64' and 'QMAKE_COMPILER_DEFINES += _WIN64' defines for

mkspecs/features/qt_functions.prf

@@ -5,7 +5,7 @@ defineReplace(qtPlatformTargetSuffix) {
     else: CONFIG(debug, debug|release) {
         !debug_and_release|build_pass {
             mac: return($${suffix}_debug)
-            win32: return($${suffix}d)
+            win32:!gcc: return($${suffix}d)
         }
     }
     return($$suffix)

src/angle/src/config.pri

@@ -53,6 +53,7 @@ CONFIG(debug, debug|release) {
 }
 
 !isEmpty(BUILD_PASS): BUILDSUBDIR = $$lower($$BUILD_PASS)/
+else: BUILDSUBDIR = $$PWD/
 
 # c++11 is needed by MinGW to get support for unordered_map.
 CONFIG += stl exceptions c++11 c++14

tests/auto/corelib/io/qresourceengine/qresourceengine_test.pro

@@ -22,7 +22,7 @@ android:!android-embedded {
     RESOURCES += android_testdata.qrc
 }
 
-win32 {
+win32:debug_and_release {
     CONFIG(debug, debug|release): LIBS += -Lstaticplugin/debug
     else: LIBS += -Lstaticplugin/release
 } else {

tests/auto/corelib/plugin/qlibrary/lib/lib.pro

@@ -12,7 +12,7 @@ msvc: DEFINES += WIN32_MSVC
 target.path = $$[QT_INSTALL_TESTS]/tst_qlibrary
 INSTALLS += target
 
-win32 {
+win32:debug_and_release {
     CONFIG(debug, debug|release) {
         DESTDIR = ../debug/
     } else {

tests/auto/corelib/plugin/qlibrary/lib2/lib2.pro

@@ -13,12 +13,18 @@ msvc: DEFINES += WIN32_MSVC
 # We want to test if we can load a shared library with *any* filename...
 
 win32 {
-    CONFIG(debug, debug|release) {
-        BUILD_FOLDER = debug
+
+    debug_and_release {
+        CONFIG(debug, debug|release)) {
+            BUILD_FOLDER = debug
+        } else {
+            BUILD_FOLDER = release
+        }
+        DESTDIR = ../$$BUILD_FOLDER/
     } else {
-        BUILD_FOLDER = release
+        BUILD_FOLDER =
+        DESTDIR = ../
     }
-    DESTDIR = ../$$BUILD_FOLDER/
 
     # vcproj and Makefile generators refer to target differently
     contains(TEMPLATE,vc.*) {

tests/auto/corelib/plugin/qlibrary/tst/tst.pro

@@ -3,7 +3,7 @@ TARGET = ../tst_qlibrary
 QT = core testlib
 SOURCES = ../tst_qlibrary.cpp
 
-win32 {
+win32:debug_and_release {
     CONFIG(debug, debug|release) {
         TARGET = ../../debug/tst_qlibrary
     } else {

tests/auto/corelib/plugin/qpluginloader/tst/tst.pro

@@ -5,7 +5,7 @@ qtConfig(private_tests): QT += core-private
 SOURCES = ../tst_qpluginloader.cpp ../fakeplugin.cpp
 HEADERS = ../theplugin/plugininterface.h
 
-win32 {
+win32:debug_and_release {
     CONFIG(debug, debug|release) {
         TARGET = ../../debug/tst_qpluginloader
         LIBS += -L../staticplugin/debug

tests/auto/network/socket/qudpsocket/test/test.pro

@@ -6,7 +6,7 @@ QT = core network testlib
 
 MOC_DIR=tmp
 
-win32 {
+win32:debug_and_release {
   CONFIG(debug, debug|release) {
     DESTDIR = ../debug
 } else {