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/clangstaticanalyzersettings.cpp

@@ -0,0 +1,98 @@
+/****************************************************************************
+**
+** 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 "clangstaticanalyzersettings.h"
+
+#include "clangstaticanalyzerconstants.h"
+
+#include <coreplugin/icore.h>
+
+#include <utils/hostosinfo.h>
+#include <utils/qtcassert.h>
+
+#include <QFileInfo>
+#include <QThread>
+
+static const char clangExecutableKey[] = "clangExecutable";
+static const char simultaneousProcessesKey[] = "simultaneousProcesses";
+
+namespace ClangStaticAnalyzer {
+namespace Internal {
+
+ClangStaticAnalyzerSettings::ClangStaticAnalyzerSettings()
+    : m_simultaneousProcesses(-1)
+{
+    readSettings();
+}
+
+ClangStaticAnalyzerSettings *ClangStaticAnalyzerSettings::instance()
+{
+    static ClangStaticAnalyzerSettings instance;
+    return &instance;
+}
+
+QString ClangStaticAnalyzerSettings::clangExecutable() const
+{
+    return m_clangExecutable;
+}
+
+void ClangStaticAnalyzerSettings::setClangExecutable(const QString &exectuable)
+{
+    QTC_ASSERT(!exectuable.isEmpty(), return);
+    m_clangExecutable = exectuable;
+}
+
+int ClangStaticAnalyzerSettings::simultaneousProcesses() const
+{
+    return m_simultaneousProcesses;
+}
+
+void ClangStaticAnalyzerSettings::setSimultaneousProcesses(int processes)
+{
+    QTC_ASSERT(processes >=1, return);
+    m_simultaneousProcesses = processes;
+}
+
+void ClangStaticAnalyzerSettings::readSettings()
+{
+    QSettings *settings = Core::ICore::settings();
+    settings->beginGroup(QLatin1String(Constants::SETTINGS_ID));
+
+    const QString defaultClangExecutable = Utils::HostOsInfo::withExecutableSuffix(
+                QLatin1String(Constants::CLANG_EXECUTABLE_BASE_NAME));
+    setClangExecutable(settings->value(QLatin1String(clangExecutableKey),
+                                       defaultClangExecutable).toString());
+
+    const int defaultSimultaneousProcesses = qMax(0, QThread::idealThreadCount() / 2);
+    setSimultaneousProcesses(settings->value(QLatin1String(simultaneousProcessesKey),
+                                             defaultSimultaneousProcesses).toInt());
+
+    settings->endGroup();
+}
+
+void ClangStaticAnalyzerSettings::writeSettings() const
+{
+    QSettings *settings = Core::ICore::settings();
+    settings->beginGroup(QLatin1String(Constants::SETTINGS_ID));
+    settings->setValue(QLatin1String(clangExecutableKey), clangExecutable());
+    settings->setValue(QLatin1String(simultaneousProcessesKey), simultaneousProcesses());
+    settings->endGroup();
+}
+
+} // namespace Internal
+} // namespace ClangStaticAnalyzer