Clang: Explicitly set the target triple

As for the analyzer, this makes us independent of the default triple and will
most likely reduce the maintenance - e.g. the target implies certain internal
command line arguments, we will profit from added ones.

This fixes parsing of mingw headers with the clang code model.

Change-Id: I722b981125a80fac5f62a7af40a83ecdd7bbf811
Reviewed-by: Christian Kandeler <christian.kandeler@theqtcompany.com>

src/plugins/cpptools/compileroptionsbuilder.cpp

@@ -61,6 +61,14 @@ void CompilerOptionsBuilder::addDefine(const QByteArray &defineLine)
     m_options.append(defineLineToDefineOption(defineLine));
 }
 
+void CompilerOptionsBuilder::addTargetTriple()
+{
+    if (!m_projectPart.targetTriple.isEmpty()) {
+        m_options.append(QLatin1String("-target"));
+        m_options.append(m_projectPart.targetTriple);
+    }
+}
+
 void CompilerOptionsBuilder::addHeaderPathOptions()
 {
     typedef ProjectPartHeaderPath HeaderPath;