Fix a crash with cmake and no toolchains configured

Task-number: QTCREATORBUG-6252
Change-Id: I8b7237c23cd70fe8dd20724ffb3ebdef18f5bf13
Reviewed-on: http://codereview.qt-project.org/6320

Reviewed-by: Daniel Teske <daniel.teske@nokia.com>
Sanity-Review: Qt Sanity Bot <qt_sanity_bot@ovi.com>

src/plugins/cmakeprojectmanager/cmakeproject.cpp

@@ -288,7 +288,9 @@ bool CMakeProject::parseCMakeLists()
     allIncludePaths.append(cbpparser.includeFiles());
 
     QStringList allFrameworkPaths;
-    QList<ProjectExplorer::HeaderPath> allHeaderPaths = activeBC->toolChain()->systemHeaderPaths();
+    QList<ProjectExplorer::HeaderPath> allHeaderPaths;
+    if (activeBC->toolChain())
+        allHeaderPaths = activeBC->toolChain()->systemHeaderPaths();
     foreach (const ProjectExplorer::HeaderPath &headerPath, allHeaderPaths) {
         if (headerPath.kind() == ProjectExplorer::HeaderPath::FrameworkHeaderPath)
             allFrameworkPaths.append(headerPath.path());
@@ -302,12 +304,12 @@ bool CMakeProject::parseCMakeLists()
         CPlusPlus::CppModelManagerInterface::ProjectInfo pinfo = modelmanager->projectInfo(this);
         if (pinfo.includePaths != allIncludePaths
             || pinfo.sourceFiles != m_files
-            || pinfo.defines != activeBC->toolChain()->predefinedMacros()
+            || pinfo.defines != (activeBC->toolChain() ? activeBC->toolChain()->predefinedMacros() : QByteArray())
             || pinfo.frameworkPaths != allFrameworkPaths)  {
             pinfo.includePaths = allIncludePaths;
             // TODO we only want C++ files, not all other stuff that might be in the project
             pinfo.sourceFiles = m_files;
-            pinfo.defines = activeBC->toolChain()->predefinedMacros(); // TODO this is to simplistic
+            pinfo.defines =  (activeBC->toolChain() ? activeBC->toolChain()->predefinedMacros() : QByteArray()); // TODO this is to simplistic
             pinfo.frameworkPaths = allFrameworkPaths;
             modelmanager->updateProjectInfo(pinfo);
             m_codeModelFuture.cancel();

src/plugins/cmakeprojectmanager/makestep.cpp

@@ -142,7 +142,10 @@ bool MakeStep::init()
     pp->setMacroExpander(bc->macroExpander());
     pp->setEnvironment(bc->environment());
     pp->setWorkingDirectory(bc->buildDirectory());
-    pp->setCommand(bc->toolChain()->makeCommand());
+    if (bc->toolChain())
+        pp->setCommand(bc->toolChain()->makeCommand());
+    else
+        pp->setCommand(QLatin1String("make"));
     pp->setArguments(arguments);
 
     setOutputParser(new ProjectExplorer::GnuMakeParser());