Debugger: reenable 32 bit cdb detection

The 64 bit cdb has unfortunately limited 32 bit debugging capabilities and there are
still a bunch of users that still need to work with 32 bit MSVC builds. Also add
functionality to reset the 64 bit cdb in kits with a 32 bit toolchain.

This reverts commit 9a06e1f65c.
This reverts commit 421210e609.

Task-number: QTCREATORBUG-31345
Change-Id: I072353b8ab6a2b93594dd4f11ecd17ca031ab6ec
Reviewed-by: Cristian Adam <cristian.adam@qt.io>
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/debugger/debuggeritem.cpp

@@ -434,11 +434,8 @@ static DebuggerItem::MatchLevel matchSingle(const Abi &debuggerAbi, const Abi &t
             return matchOnMultiarch;
     }
 
-    if (debuggerAbi.wordWidth() == 64 && targetAbi.wordWidth() == 32) {
+    if (debuggerAbi.wordWidth() == 64 && targetAbi.wordWidth() == 32)
-        return HostOsInfo::isWindowsHost() && engineType == CdbEngineType
+        return DebuggerItem::MatchesSomewhat;
-                   ? DebuggerItem::MatchesPerfectly
-                   : DebuggerItem::MatchesSomewhat;
-    }
     if (debuggerAbi.wordWidth() != 0 && debuggerAbi.wordWidth() != targetAbi.wordWidth())
         return matchOnMultiarch;
 

src/plugins/debugger/debuggeritemmanager.cpp

@@ -549,7 +549,7 @@ void DebuggerItemModel::autoDetectCdbDebuggers()
 
     for (const QFileInfo &kitFolderFi : kitFolders) {
         const QString path = kitFolderFi.absoluteFilePath();
-        QStringList abis = {"x64"};
+        QStringList abis = {"x86", "x64"};
         if (HostOsInfo::hostArchitecture() == Utils::OsArchArm64)
             abis << "arm64";
         for (const QString &abi: abis) {
@@ -783,12 +783,6 @@ void DebuggerItemModel::readDebuggers(const FilePath &fileName, bool isSystem)
                                   .arg(item.command().toUserOutput(), item.id().toString(), fileName.toUserOutput());
                     continue;
                 }
-                if (item.engineType() == CdbEngineType
-                    && Abi::abisOfBinary(item.command()).value(0).wordWidth() == 32) {
-                    qWarning() << QString("32 bit CDB \"%1\" (%2) read from \"%3\" dropped since it is not supported anymore.")
-                                  .arg(item.command().toUserOutput(), item.id().toString(), fileName.toUserOutput());
-                    continue;
-                }
                 // FIXME: During startup, devices are not yet available, so we cannot check if the file still exists.
                 if (!item.command().needsDevice() && !item.command().isExecutableFile()) {
                     qWarning() << QString("DebuggerItem \"%1\" (%2) read from \"%3\" dropped since the command is not executable.")

src/plugins/debugger/debuggerkitaspect.cpp

@@ -391,10 +391,21 @@ public:
     void fix(Kit *k) override
     {
         const QVariant id = k->value(DebuggerKitAspect::id());
-        if (Utils::anyOf(DebuggerItemManager::debuggers(), Utils::equal(&DebuggerItem::id, id)))
+        const DebuggerItem debugger = Utils::findOrDefault(
+            DebuggerItemManager::debuggers(), Utils::equal(&DebuggerItem::id, id));
+        if (debugger.isValid() && debugger.engineType() == CdbEngineType) {
+            const int tcWordWidth = ToolchainKitAspect::targetAbi(k).wordWidth();
+            if (Utils::anyOf(debugger.abis(), Utils::equal(&Abi::wordWidth, tcWordWidth)))
                 return;
-        k->removeKeySilently(DebuggerKitAspect::id());
+
-        setup(k);
+            for (const DebuggerItem &item : DebuggerItemManager::debuggers()) {
+                if (item.engineType() == CdbEngineType
+                    && Utils::anyOf(item.abis(), Utils::equal(&Abi::wordWidth, tcWordWidth))) {
+                    k->setValue(DebuggerKitAspect::id(), item.id());
+                    return;
+                }
+            }
+        }
     }
 
     KitAspect *createKitAspect(Kit *k) const override