ProjectExplorer: Detect all msvc toolchains.

The host system will not be taken into account, so the cross build
toolchains are also detected.

Task-number: QTCREATORBUG-10998
Change-Id: I04a410bbf368898b70d9560d2c2a4a6c60ed0b61
Reviewed-by: Daniel Teske <daniel.teske@digia.com>

src/plugins/projectexplorer/msvctoolchain.h

@@ -49,8 +49,12 @@ public:
     enum Type { WindowsSDK, VS };
     enum Platform { x86,
                     amd64,
+                    x86_amd64,
                     ia64,
-                    arm
+                    x86_ia64,
+                    arm,
+                    x86_arm,
+                    amd64_arm
                   };
 
     MsvcToolChain(const QString &name, const Abi &abi,
@@ -104,6 +108,7 @@ public:
 
     ToolChainConfigWidget *configurationWidget(ToolChain *);
     static QString vcVarsBatFor(const QString &basePath, const QString &toolchainName);
+    static QString vcVarsBatFor(const QString &basePath, MsvcToolChain::Platform platform);
 private:
     static bool checkForVisualStudioInstallation(const QString &vsName);
 };

src/plugins/projectexplorer/toolchainmanager.cpp

@@ -77,7 +77,7 @@ public:
     QMap<QString, FileName> m_abiToDebugger;
     PersistentSettingsWriter *m_writer;
 
-    QList<ToolChain *> m_toolChains;
+    QList<ToolChain *> m_toolChains; // prioritized List
 };
 
 ToolChainManagerPrivate::~ToolChainManagerPrivate()

src/plugins/qtsupport/qtoptionspage.cpp

@@ -386,15 +386,21 @@ QtOptionsPageWidget::ValidityInfo QtOptionsPageWidget::validInformation(const Ba
 
 QList<ToolChain*> QtOptionsPageWidget::toolChains(const BaseQtVersion *version)
 {
-    QHash<QString,ToolChain*> toolChains;
+    QList<ToolChain*> toolChains;
     if (!version)
-        return toolChains.values();
+        return toolChains;
 
-    foreach (const Abi &a, version->qtAbis())
-        foreach (ToolChain *tc, ToolChainManager::findToolChains(a))
-            toolChains.insert(tc->id(), tc);
+    QSet<QString> ids;
+    foreach (const Abi &a, version->qtAbis()) {
+        foreach (ToolChain *tc, ToolChainManager::findToolChains(a)) {
+            if (ids.contains(tc->id()))
+                continue;
+            ids.insert(tc->id());
+            toolChains.append(tc);
+        }
+    }
 
-    return toolChains.values();
+    return toolChains;
 }
 
 QString QtOptionsPageWidget::defaultToolChainId(const BaseQtVersion *version)