CMake: Disable BC if there is an error during initial cmake run

* Disable the BC and give report the cmake error
* Show a warning label in the BC

Change-Id: If5737d033fa2682c264ab7ac1189c59947e3b28d
Reviewed-by: Tim Jenssen <tim.jenssen@theqtcompany.com>

src/plugins/cmakeprojectmanager/cmakeproject.cpp

@@ -139,6 +139,8 @@ void CMakeProject::changeActiveBuildConfiguration(ProjectExplorer::BuildConfigur
                 this, &CMakeProject::parsingStarted);
         connect(m_buildDirManager, &BuildDirManager::dataAvailable,
                 this, &CMakeProject::parseCMakeOutput);
+        connect(m_buildDirManager, &BuildDirManager::errorOccured,
+                cmakebc, &CMakeBuildConfiguration::setError);
     }
 }