CppTools: added ProjectPart::evaluateToolchain()

At this moment each project manager duplicates code that reads C++ code
model information from ProjectExplorer::ToolChain.
This change provides unified way.

Change-Id: If9ecfc40991aab90768dd69f5f10f31bbf5fbc21
Reviewed-by: Daniel Teske <daniel.teske@digia.com>

src/plugins/cpptools/cppmodelmanagerinterface.cpp

@@ -29,6 +29,8 @@
 
 #include "cppmodelmanagerinterface.h"
 
+#include <projectexplorer/toolchain.h>
+#include <projectexplorer/headerpath.h>
 #include <cplusplus/pp-engine.h>
 
 #include <QtCore/QSet>
@@ -48,6 +50,61 @@
 */
 
 using namespace CppTools;
+using namespace ProjectExplorer;
+
+/**
+ * @brief Retrieves info from concrete compiler using it's flags.
+ * @param tc Either nullptr or toolchain for project's active target.
+ * @param cxxflags C++ or Objective-C++ flags.
+ * @param cflags C or ObjectiveC flags if possible, \a cxxflags otherwise.
+ */
+void ProjectPart::evaluateToolchain(const ToolChain *tc,
+                                    const QStringList &cxxflags,
+                                    const QStringList &cflags,
+                                    const Utils::FileName &sysRoot)
+{
+    if (!tc)
+        return;
+    ToolChain::CompilerFlags cxx = tc->compilerFlags(cxxflags);
+    ToolChain::CompilerFlags c = (cxxflags == cflags)
+            ? cxx : tc->compilerFlags(cflags);
+
+    if (c | ToolChain::StandardC11)
+        cVersion = C11;
+    else if (c | ToolChain::StandardC99)
+        cVersion = C99;
+    else
+        cVersion = C89;
+
+    if (cxx | ToolChain::StandardCxx11)
+        cxxVersion = CXX11;
+    else
+        cxxVersion = CXX98;
+
+    if (cxx | ToolChain::BorlandExtensions)
+        cxxExtensions |= BorlandExtensions;
+    if (cxx | ToolChain::GnuExtensions)
+        cxxExtensions |= GnuExtensions;
+    if (cxx | ToolChain::MicrosoftExtensions)
+        cxxExtensions |= MicrosoftExtensions;
+    if (cxx | ToolChain::OpenMP)
+        cxxExtensions |= OpenMP;
+
+    QList<HeaderPath> headers = tc->systemHeaderPaths(cxxflags, sysRoot);
+    foreach (const HeaderPath &header, headers)
+        if (header.kind() == HeaderPath::FrameworkHeaderPath)
+            frameworkPaths << header.path();
+        else
+            includePaths << header.path();
+
+    QByteArray macros = tc->predefinedMacros(cxxflags);
+    if (!macros.isEmpty()) {
+        if (!defines.isEmpty())
+            defines += '\n';
+        defines += macros;
+        defines += '\n';
+    }
+}
 
 static CppModelManagerInterface *g_instance = 0;