CMakeProjectManager: Support for multi-config generators

CMake has multi-config generators like:

  * Visual Studio
  * Xcode
  * Ninja Multi-Config

The first two have different special targets for "all", "install",
"package", "test" namely: "ALL_BUILD", "INSTALL", "PACKAGE",
"RUN_TESTS".

All of them need to get the build type passed via "--config <build-
type>" and not via "CMAKE_BUILD_TYPE".

The multi-config generators will use only one build directory.

Fixes: QTCREATORBUG-24984
Change-Id: I8aa7ff73ce2af1e163b21a6504d26fcf95530edf
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/plugins/cmakeprojectmanager/cmakeproject.h

@@ -33,6 +33,7 @@ namespace CMakeProjectManager {
 
 namespace Internal {
 class CMakeProjectImporter;
+class CMakeBuildSystem;
 }
 
 class CMAKE_EXPORT CMakeProject final : public ProjectExplorer::Project
@@ -57,7 +58,7 @@ private:
 
     mutable Internal::CMakeProjectImporter *m_projectImporter = nullptr;
 
-    friend class CMakeBuildSystem;
+    friend class Internal::CMakeBuildSystem;
 };
 
 } // namespace CMakeProjectManager