CppTools: ProjectPart now collects warning flags

Will be used by ClangCodeModel, but native model also can use it by
disabling unused variable/parameter warnings when needed.

Change-Id: I184efb3c65e893a2d85a933385cc547b646e6826
Reviewed-by: Erik Verbruggen <erik.verbruggen@digia.com>

src/plugins/cpptools/cppmodelmanagerinterface.cpp

@@ -52,6 +52,16 @@
 using namespace CppTools;
 using namespace ProjectExplorer;
 
+ProjectPart::ProjectPart()
+    : cVersion(C89)
+    , cxxVersion(CXX11)
+    , cxxExtensions(NoExtensions)
+    , qtVersion(UnknownQt)
+    , cWarningFlags(ProjectExplorer::ToolChain::WarningsDefault)
+    , cxxWarningFlags(ProjectExplorer::ToolChain::WarningsDefault)
+{
+}
+
 /**
  * @brief Retrieves info from concrete compiler using it's flags.
  * @param tc Either nullptr or toolchain for project's active target.
@@ -90,6 +100,9 @@ void ProjectPart::evaluateToolchain(const ToolChain *tc,
     if (cxx | ToolChain::OpenMP)
         cxxExtensions |= OpenMP;
 
+    cWarningFlags = tc->warningFlags(cflags);
+    cxxWarningFlags = tc->warningFlags(cxxflags);
+
     QList<HeaderPath> headers = tc->systemHeaderPaths(cxxflags, sysRoot);
     foreach (const HeaderPath &header, headers)
         if (header.kind() == HeaderPath::FrameworkHeaderPath)

src/plugins/cpptools/cppmodelmanagerinterface.h

@@ -34,6 +34,7 @@
 #include "cppprojectfile.h"
 
 #include <cplusplus/CppDocument.h>
+#include <projectexplorer/toolchain.h>
 
 #include <QObject>
 #include <QHash>
@@ -43,10 +44,7 @@
 
 namespace Core { class IEditor; }
 namespace CPlusPlus { class LookupContext; }
-namespace ProjectExplorer {
-class Project;
-class ToolChain;
-}
+namespace ProjectExplorer { class Project; }
 namespace TextEditor { class BaseTextEditor; }
 namespace Utils { class FileName; }
 
@@ -62,12 +60,7 @@ class CppIndexingSupport;
 class CPPTOOLS_EXPORT ProjectPart
 {
 public:
-    ProjectPart()
-        : cVersion(C89)
-        , cxxVersion(CXX11)
-        , cxxExtensions(NoExtensions)
-        , qtVersion(UnknownQt)
-    {}
+    ProjectPart();
 
     void evaluateToolchain(const ProjectExplorer::ToolChain *tc,
                            const QStringList &cxxflags,
@@ -114,6 +107,8 @@ public: //attributes
     CXXVersion cxxVersion;
     CXXExtensions cxxExtensions;
     QtVersion qtVersion;
+    ProjectExplorer::ToolChain::WarningFlags cWarningFlags;
+    ProjectExplorer::ToolChain::WarningFlags cxxWarningFlags;
 };
 
 class CPPTOOLS_EXPORT CppModelManagerInterface : public QObject