Import Clang Static Analyzer plugin

This plugin adds "Clang Static Analyzer" to the Analyze mode, which
processes all implementation/source project files of the current
project. For this, it will call the clang executable for each file.

The found diagnostics will be displayed in a view similar to the one
used in "Valgrind Memory Analyzer".

The user can specify the clang executable to use and the number of
concurrent processes to launch in Menu: Tools > Options > Analyzer >
Clang Static Analyzer.

Main TODOs:

 * Fiddle around the appropriate command line options, currently only
   defines and include paths are passed on.

 * Tests on Windows / OS X.

 * Remove dependency to clangcodemodel by moving the functions that
   create command line arguments to CppTools. Mostly they are not even
   specific to clang (but would also work with gcc).

 * Maybe limit to a range of tested clang versions.

 * How to deal with directory containing all the log files after the
   user starts a new run or Creator is shut down? (delete it? leave it
   there? make it configurable?).

 * Find out how to properly integrate the tests.

Imaginable future additions:

 * Adding a button to load result/log files from a directory, e.g. if
   the user used the 'scan-build' approach.

 * Adding a button with a filter menu in order to display only
   diagnostics from certain categories, similar to "Valgrind Memory
   Analyzer".

Change-Id: I6aeb5dfdbdfa239a06c03dd8759a983df71b77ea
Reviewed-by: Eike Ziller <eike.ziller@theqtcompany.com>

plugins/clangstaticanalyzer/clangstaticanalyzerutils.cpp

@@ -0,0 +1,75 @@
+/****************************************************************************
+**
+** Copyright (C) 2014 Digia Plc
+** All rights reserved.
+** For any questions to Digia, please use contact form at http://qt.digia.com <http://qt.digia.com/>
+**
+** This file is part of the Qt Enterprise LicenseChecker Add-on.
+**
+** Licensees holding valid Qt Enterprise licenses may use this file in
+** accordance with the Qt Enterprise License Agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Digia.
+**
+** If you have questions regarding the use of this file, please use
+** contact form at http://qt.digia.com <http://qt.digia.com/>
+**
+****************************************************************************/
+
+#include "clangstaticanalyzerutils.h"
+
+#include "clangstaticanalyzerdiagnostic.h"
+#include "clangstaticanalyzersettings.h"
+
+#include <utils/environment.h>
+
+#include <QFileInfo>
+
+static bool isFileExecutable(const QString &executablePath)
+{
+    if (executablePath.isEmpty())
+        return false;
+
+    const QFileInfo fileInfo(executablePath);
+    return fileInfo.isFile() && fileInfo.isExecutable();
+}
+
+namespace ClangStaticAnalyzer {
+namespace Internal {
+
+QString clangExecutableFromSettings(bool *isValid)
+{
+    return clangExecutable(ClangStaticAnalyzerSettings::instance()->clangExecutable(), isValid);
+}
+
+QString clangExecutable(const QString &fileNameOrPath, bool *isValid)
+{
+    QString executable = fileNameOrPath;
+    if (executable.isEmpty()) {
+        *isValid = false;
+        return executable;
+    }
+
+    if (!QFileInfo(executable).isAbsolute()) {
+        const Utils::Environment &environment = Utils::Environment::systemEnvironment();
+        const QString executableFromPath = environment.searchInPath(executable).toString();
+        if (executableFromPath.isEmpty()) {
+            *isValid = false;
+            return executable;
+        }
+        executable = executableFromPath;
+    }
+
+    *isValid = isFileExecutable(executable);
+    return executable;
+}
+
+QString createFullLocationString(const ClangStaticAnalyzer::Internal::Location &location)
+{
+    const QString filePath = location.filePath;
+    const QString lineNumber = QString::number(location.line);
+    return filePath + QLatin1Char(':') + lineNumber;
+}
+
+} // namespace Internal
+} // namespace ClangStaticAnalyzer