GccToolChain: Invalidate caches on toolchain changes

Change-Id: I91a69631d0417beb35574a5725da6b5a5e411113
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@qt.io>

src/plugins/projectexplorer/gcctoolchain.cpp

@@ -177,6 +177,13 @@ QList<HeaderPath> GccToolChain::gccHeaderPaths(const FileName &gcc, const QStrin
     return systemHeaderPaths;
 }
 
+void GccToolChain::toolChainUpdated()
+{
+    m_predefinedMacrosCache->invalidate();
+    m_headerPathsCache->invalidate();
+    ToolChain::toolChainUpdated();
+}
+
 static QList<Abi> guessGccAbi(const QString &m, const ProjectExplorer::Macros &macros)
 {
     QList<Abi> abiList;

src/plugins/projectexplorer/gcctoolchain.h

@@ -104,6 +104,12 @@ public:
         return checkImpl(compilerArguments);
     }
 
+    void invalidate()
+    {
+        QMutexLocker locker(&m_mutex);
+        m_cache.clear();
+    }
+
 private:
     Utils::optional<T> checkImpl(const QStringList &compilerArguments)
     {
@@ -217,6 +223,7 @@ protected:
         bool m_doesEnable = false;
         bool m_triggered = false;
     };
+    void toolChainUpdated() override;
 
 private:
     explicit GccToolChain(Detection d);

src/plugins/projectexplorer/toolchain.h

@@ -158,7 +158,7 @@ protected:
     explicit ToolChain(Core::Id typeId, Detection d);
     explicit ToolChain(const ToolChain &);
 
-    void toolChainUpdated();
+    virtual void toolChainUpdated();
 
     // Make sure to call this function when deriving!
     virtual bool fromMap(const QVariantMap &data);