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/cmakebuildsystem.h

@@ -97,6 +97,9 @@ public:
     static CMakeConfig parseCMakeCacheDotTxt(const Utils::FilePath &cacheFile,
                                              QString *errorMessage);
 
+    bool isMultiConfig() const;
+    bool usesAllCapsTargets() const;
+
 private:
     // Actually ask for parsing:
     enum ReparseParameters {