ClangTools: Remove dependency to libclang and custom clang binary

Before this change, we've invoked a custom clang binary that had clazy
statically compiled into it. The invocation also ensured that the
diagnostics were serialized to a file, so that libclang could be used
afterwards to read them.

As the clazy-standalone executable supports exporting diagnostics to a
YAML file now (just as clang-tidy) and Qt Creator ships it already, rely
on that executable alone instead of the clang/libclang combo.

While we do not depend on any clang header or library at build-time now,
the CompilerOptionsBuilder constructor still needs the CLANG_VERSION and
CLANG_RESOURCE_DIR pieces from llvm-config. This dependency should be
removed as next.

Change-Id: I4fa5753ab09008fd24bc5247b28c4836b5e8ca45
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>
Reviewed-by: hjk <hjk@qt.io>

11 files changed, 14 insertions, 282 deletions

diff --git a/src/plugins/clangtools/clangtidyclazyrunner.cpp b/src/plugins/clangtools/clangtidyclazyrunner.cpp
index 166d1c94e0..5bab62b474 100644
--- a/src/plugins/clangtools/clangtidyclazyrunner.cpp
+++ b/src/plugins/clangtools/clangtidyclazyrunner.cpp
@@ -53,28 +53,6 @@ static bool isClMode(const QStringList &options)
     return options.contains("--driver-mode=cl");
 }
 
-static QStringList serializeDiagnosticsArguments(const QStringList &baseOptions,
-                                                 const QString &outputFilePath)
-{
-    const QStringList serializeArgs{"-serialize-diagnostics", outputFilePath};
-    if (isClMode(baseOptions))
-        return clangArgsForCl(serializeArgs);
-    return serializeArgs;
-}
-
-static QStringList clazyPluginArguments(const ClangDiagnosticConfig diagnosticConfig)
-{
-    QStringList arguments;
-
-    if (diagnosticConfig.isClazyEnabled()) {
-        arguments << XclangArgs({"-add-plugin", "clazy"});
-        if (!diagnosticConfig.clazyChecks().isEmpty())
-            arguments << XclangArgs({"-plugin-arg-clazy", diagnosticConfig.clazyChecks()});
-    }
-
-    return arguments;
-}
-
 static QStringList tidyChecksArguments(const ClangDiagnosticConfig diagnosticConfig)
 {
     const ClangDiagnosticConfig::TidyMode tidyMode = diagnosticConfig.clangTidyMode();
@@ -147,19 +125,5 @@ ClazyStandaloneRunner::ClazyStandaloneRunner(const ClangDiagnosticConfig &config
     });
 }
 
-ClazyPluginRunner::ClazyPluginRunner(const ClangDiagnosticConfig &config, QObject *parent)
-    : ClangToolRunner(parent)
-{
-    setName(tr("Clazy"));
-    setOutputFileFormat(OutputFileFormat::Serialized);
-    setExecutable(Core::ICore::clangExecutable(CLANG_BINDIR));
-    setArgsCreator([this, config](const QStringList &baseOptions) {
-        return serializeDiagnosticsArguments(baseOptions, outputFilePath())
-            << clazyPluginArguments(config)
-            << clangArguments(config, baseOptions)
-            << QDir::toNativeSeparators(fileToAnalyze());
-    });
-}
-
 } // namespace Internal
 } // namespace ClangTools
diff --git a/src/plugins/clangtools/clangtidyclazyrunner.h b/src/plugins/clangtools/clangtidyclazyrunner.h
index 72cd7a155c..ec9b940a18 100644
--- a/src/plugins/clangtools/clangtidyclazyrunner.h
+++ b/src/plugins/clangtools/clangtidyclazyrunner.h
@@ -48,13 +48,5 @@ public:
     ClazyStandaloneRunner(const CppTools::ClangDiagnosticConfig &config, QObject *parent = nullptr);
 };
 
-class ClazyPluginRunner final : public ClangToolRunner
-{
-    Q_OBJECT
-
-public:
-    ClazyPluginRunner(const CppTools::ClangDiagnosticConfig &config, QObject *parent = nullptr);
-};
-
 } // namespace Internal
 } // namespace ClangTools
diff --git a/src/plugins/clangtools/clangtool.cpp b/src/plugins/clangtools/clangtool.cpp
index f23a088889..d96bdfd40f 100644
--- a/src/plugins/clangtools/clangtool.cpp
+++ b/src/plugins/clangtools/clangtool.cpp
@@ -717,7 +717,6 @@ void ClangTool::startTool(ClangTool::FileSelection fileSelection,
 
 Diagnostics ClangTool::read(OutputFileFormat outputFileFormat,
                             const QString &logFilePath,
-                            const QString &mainFilePath,
                             const QSet<FilePath> &projectFiles,
                             QString *errorMessage) const
 {
@@ -730,10 +729,8 @@ Diagnostics ClangTool::read(OutputFileFormat outputFileFormat,
                                        acceptFromFilePath,
                                        errorMessage);
     }
-    return readSerializedDiagnostics(Utils::FilePath::fromString(logFilePath),
-                                     Utils::FilePath::fromString(mainFilePath),
-                                     acceptFromFilePath,
-                                     errorMessage);
+
+    return {};
 }
 
 FileInfos ClangTool::collectFileInfos(Project *project, FileSelection fileSelection)
diff --git a/src/plugins/clangtools/clangtool.h b/src/plugins/clangtools/clangtool.h
index b867cf1845..7882245e91 100644
--- a/src/plugins/clangtools/clangtool.h
+++ b/src/plugins/clangtools/clangtool.h
@@ -96,7 +96,6 @@ public:
 
     Diagnostics read(OutputFileFormat outputFileFormat,
                      const QString &logFilePath,
-                     const QString &mainFilePath,
                      const QSet<Utils::FilePath> &projectFiles,
                      QString *errorMessage) const;
 
diff --git a/src/plugins/clangtools/clangtoolruncontrol.cpp b/src/plugins/clangtools/clangtoolruncontrol.cpp
index 3932d5b440..2d077a1502 100644
--- a/src/plugins/clangtools/clangtoolruncontrol.cpp
+++ b/src/plugins/clangtools/clangtoolruncontrol.cpp
@@ -236,12 +236,8 @@ QList<RunnerCreator> ClangToolRunWorker::runnerCreators()
     if (m_diagnosticConfig.isClangTidyEnabled())
         creators << [this]() { return createRunner<ClangTidyRunner>(); };
 
-    if (m_diagnosticConfig.isClazyEnabled()) {
-        if (!qEnvironmentVariable("QTC_USE_CLAZY_STANDALONE_PATH").isEmpty())
-            creators << [this]() { return createRunner<ClazyStandaloneRunner>(); };
-        else
-            creators << [this]() { return createRunner<ClazyPluginRunner>(); };
-    }
+    if (m_diagnosticConfig.isClazyEnabled())
+        creators << [this]() { return createRunner<ClazyStandaloneRunner>(); };
 
     return creators;
 }
@@ -388,7 +384,6 @@ void ClangToolRunWorker::onRunnerFinishedWithSuccess(const QString &filePath)
     QString errorMessage;
     const Diagnostics diagnostics = tool()->read(runner->outputFileFormat(),
                                                  outputFilePath,
-                                                 filePath,
                                                  m_projectFiles,
                                                  &errorMessage);
 
diff --git a/src/plugins/clangtools/clangtools.pro b/src/plugins/clangtools/clangtools.pro
index 9b1076fbda..7abb6bc53b 100644
--- a/src/plugins/clangtools/clangtools.pro
+++ b/src/plugins/clangtools/clangtools.pro
@@ -4,9 +4,6 @@ include(../../shared/clang/clang_defines.pri)
 
 requires(!isEmpty(LLVM_VERSION))
 
-LIBS += $$LIBCLANG_LIBS
-INCLUDEPATH += $$LLVM_INCLUDEPATH
-
 include(../../shared/yaml-cpp/yaml-cpp_installation.pri)
 isEmpty(EXTERNAL_YAML_CPP_FOUND) {
     DEFINES += YAML_CPP_DLL
diff --git a/src/plugins/clangtools/clangtools.qbs b/src/plugins/clangtools/clangtools.qbs
index 07ec6201b1..e3d93e34f5 100644
--- a/src/plugins/clangtools/clangtools.qbs
+++ b/src/plugins/clangtools/clangtools.qbs
@@ -12,7 +12,6 @@ QtcPlugin {
     Depends { name: "QtcSsh" }
     Depends { name: "Utils" }
 
-    Depends { name: "libclang"; required: false }
     Depends { name: "yaml-cpp" }
     Depends { name: "clang_defines" }
 
@@ -27,13 +26,6 @@ QtcPlugin {
         "QmakeProjectManager",
     ]
 
-    condition: libclang.present
-
-    cpp.includePaths: base.concat(libclang.llvmIncludeDir)
-    cpp.libraryPaths: base.concat(libclang.llvmLibDir)
-    cpp.dynamicLibraries: base.concat(libclang.llvmLibs)
-    cpp.rpaths: base.concat(libclang.llvmLibDir)
-
     files: [
         "clangfileinfo.h",
         "clangfixitsrefactoringchanges.cpp",
diff --git a/src/plugins/clangtools/clangtoolslogfilereader.cpp b/src/plugins/clangtools/clangtoolslogfilereader.cpp
index fc80a1b829..9acfe6c00e 100644
--- a/src/plugins/clangtools/clangtoolslogfilereader.cpp
+++ b/src/plugins/clangtools/clangtoolslogfilereader.cpp
@@ -27,198 +27,17 @@
 
 #include <cpptools/cppprojectfile.h>
 
-#include <QDebug>
 #include <QDir>
-#include <QFile>
 #include <QFileInfo>
-#include <QObject>
-#include <QRegularExpression>
-#include <QXmlStreamReader>
 
-#include <utils/executeondestruction.h>
 #include <utils/fileutils.h>
-#include <utils/hostosinfo.h>
-#include <utils/qtcassert.h>
 #include <utils/textutils.h>
 
-#include <clang-c/Index.h>
-
 #include <yaml-cpp/yaml.h>
 
 namespace ClangTools {
 namespace Internal {
 
-static QString fromCXString(CXString &&cxString)
-{
-    QString result = QString::fromUtf8(clang_getCString(cxString));
-    clang_disposeString(cxString);
-    return result;
-}
-
-static Debugger::DiagnosticLocation diagLocationFromSourceLocation(CXSourceLocation cxLocation)
-{
-    CXFile file;
-    unsigned line;
-    unsigned column;
-    clang_getSpellingLocation(cxLocation, &file, &line, &column, nullptr);
-
-    Debugger::DiagnosticLocation location;
-    location.filePath = fromCXString(clang_getFileName(file));
-    location.filePath = QDir::cleanPath(location.filePath); // Normalize to find duplicates later
-    location.line = line;
-    location.column = column;
-    return location;
-}
-
-static QString cxDiagnosticType(const CXDiagnostic cxDiagnostic)
-{
-    const CXDiagnosticSeverity severity = clang_getDiagnosticSeverity(cxDiagnostic);
-    switch (severity) {
-    case CXDiagnostic_Note:
-        return QString("note");
-    case CXDiagnostic_Warning:
-        return QString("warning");
-    case CXDiagnostic_Error:
-        return QString("error");
-    case CXDiagnostic_Fatal:
-        return QString("fatal");
-    case CXDiagnostic_Ignored:
-        return QString("ignored");
-    }
-    return QString("ignored");
-}
-
-static ExplainingStep buildChildDiagnostic(const CXDiagnostic cxDiagnostic)
-{
-    ExplainingStep diagnosticStep;
-    QString type = cxDiagnosticType(cxDiagnostic);
-    if (type == QStringLiteral("ignored"))
-        return diagnosticStep;
-
-    const CXSourceLocation cxLocation = clang_getDiagnosticLocation(cxDiagnostic);
-    diagnosticStep.location = diagLocationFromSourceLocation(cxLocation);
-    diagnosticStep.message = fromCXString(clang_getDiagnosticSpelling(cxDiagnostic));
-    return diagnosticStep;
-}
-
-static bool isInvalidDiagnosticLocation(const Diagnostic &diagnostic, const ExplainingStep &child,
-                                        const QString &nativeFilePath)
-{
-    // When main file is considered included by itself - this diagnostic has invalid location.
-    // This case usually happens when original diagnostic comes from system header but
-    // has main file name set in the source location instead (which is incorrect).
-    return child.message.indexOf(nativeFilePath) >= 0
-            && child.message.indexOf("in file included from") >= 0
-            && diagnostic.location.filePath == nativeFilePath;
-}
-
-static ExplainingStep buildFixIt(const CXDiagnostic cxDiagnostic, unsigned index)
-{
-    ExplainingStep fixItStep;
-    CXSourceRange cxFixItRange;
-    fixItStep.isFixIt = true;
-    fixItStep.message = fromCXString(clang_getDiagnosticFixIt(cxDiagnostic, index, &cxFixItRange));
-    fixItStep.location = diagLocationFromSourceLocation(clang_getRangeStart(cxFixItRange));
-    fixItStep.ranges.push_back(fixItStep.location);
-    fixItStep.ranges.push_back(diagLocationFromSourceLocation(clang_getRangeEnd(cxFixItRange)));
-    return fixItStep;
-}
-
-static Diagnostic buildDiagnostic(const CXDiagnostic cxDiagnostic,
-                                  const AcceptDiagsFromFilePath &acceptFromFilePath,
-                                  const QString &nativeFilePath)
-{
-    Diagnostic diagnostic;
-    diagnostic.type = cxDiagnosticType(cxDiagnostic);
-    if (diagnostic.type == QStringLiteral("ignored"))
-        return diagnostic;
-
-    const CXSourceLocation cxLocation = clang_getDiagnosticLocation(cxDiagnostic);
-    if (clang_Location_isInSystemHeader(cxLocation))
-        return diagnostic;
-
-    diagnostic.location = diagLocationFromSourceLocation(cxLocation);
-    const auto diagnosticFilePath = Utils::FilePath::fromString(diagnostic.location.filePath);
-    if (acceptFromFilePath && !acceptFromFilePath(diagnosticFilePath))
-        return diagnostic;
-
-    // TODO: Introduce CppTools::ProjectFile::isGenerated to filter these out properly
-    const QString fileName = diagnosticFilePath.fileName();
-    if ((fileName.startsWith("ui_") && fileName.endsWith(".h")) || fileName.endsWith(".moc"))
-        return diagnostic;
-
-    CXDiagnosticSet cxChildDiagnostics = clang_getChildDiagnostics(cxDiagnostic);
-    Utils::ExecuteOnDestruction onBuildExit([&]() {
-        clang_disposeDiagnosticSet(cxChildDiagnostics);
-    });
-
-    using CppTools::ProjectFile;
-    const bool isHeaderFile = ProjectFile::isHeader(
-        ProjectFile::classify(diagnostic.location.filePath));
-
-    for (unsigned i = 0; i < clang_getNumDiagnosticsInSet(cxChildDiagnostics); ++i) {
-        CXDiagnostic cxDiagnostic = clang_getDiagnosticInSet(cxChildDiagnostics, i);
-        Utils::ExecuteOnDestruction cleanUpDiagnostic([&]() {
-            clang_disposeDiagnostic(cxDiagnostic);
-        });
-        const ExplainingStep diagnosticStep = buildChildDiagnostic(cxDiagnostic);
-        if (diagnosticStep.isValid())
-            continue;
-
-        if (isHeaderFile && diagnosticStep.message.contains("in file included from"))
-            continue;
-
-        if (isInvalidDiagnosticLocation(diagnostic, diagnosticStep, nativeFilePath))
-            return diagnostic;
-
-        diagnostic.explainingSteps.push_back(diagnosticStep);
-    }
-
-    const unsigned fixItCount = clang_getDiagnosticNumFixIts(cxDiagnostic);
-    diagnostic.hasFixits = fixItCount != 0;
-    for (unsigned i = 0; i < fixItCount; ++i)
-        diagnostic.explainingSteps.push_back(buildFixIt(cxDiagnostic, i));
-
-    diagnostic.description = fromCXString(clang_getDiagnosticSpelling(cxDiagnostic));
-    diagnostic.category = fromCXString(clang_getDiagnosticCategoryText(cxDiagnostic));
-
-    return diagnostic;
-}
-
-static Diagnostics readSerializedDiagnostics_helper(const Utils::FilePath &logFilePath,
-                                                    const Utils::FilePath &mainFilePath,
-                                                    const AcceptDiagsFromFilePath &acceptFromFilePath)
-{
-    Diagnostics list;
-    CXLoadDiag_Error error;
-    CXString errorString;
-
-    CXDiagnosticSet diagnostics = clang_loadDiagnostics(logFilePath.toString().toStdString().c_str(),
-                                                        &error,
-                                                        &errorString);
-    if (error != CXLoadDiag_None || !diagnostics)
-        return list;
-
-    Utils::ExecuteOnDestruction onReadExit([&]() {
-        clang_disposeDiagnosticSet(diagnostics);
-    });
-
-    const QString nativeFilePath = QDir::toNativeSeparators(mainFilePath.toString());
-    for (unsigned i = 0; i < clang_getNumDiagnosticsInSet(diagnostics); ++i) {
-        CXDiagnostic cxDiagnostic = clang_getDiagnosticInSet(diagnostics, i);
-        Utils::ExecuteOnDestruction cleanUpDiagnostic([&]() {
-            clang_disposeDiagnostic(cxDiagnostic);
-        });
-        const Diagnostic diagnostic = buildDiagnostic(cxDiagnostic, acceptFromFilePath, nativeFilePath);
-        if (!diagnostic.isValid())
-            continue;
-
-        list.push_back(diagnostic);
-    }
-
-    return list;
-}
-
 static bool checkFilePath(const Utils::FilePath &filePath, QString *errorMessage)
 {
     QFileInfo fi(filePath.toFileInfo());
@@ -234,17 +53,6 @@ static bool checkFilePath(const Utils::FilePath &filePath, QString *errorMessage
     return true;
 }
 
-Diagnostics readSerializedDiagnostics(const Utils::FilePath &logFilePath,
-                                      const Utils::FilePath &mainFilePath,
-                                      const AcceptDiagsFromFilePath &acceptFromFilePath,
-                                      QString *errorMessage)
-{
-    if (!checkFilePath(logFilePath, errorMessage))
-        return {};
-
-    return readSerializedDiagnostics_helper(logFilePath, mainFilePath, acceptFromFilePath);
-}
-
 Utils::optional<LineColumnInfo> byteOffsetInUtf8TextToLineColumn(const char *text,
                                                                  int offset,
                                                                  int startLine)
diff --git a/src/plugins/clangtools/clangtoolslogfilereader.h b/src/plugins/clangtools/clangtoolslogfilereader.h
index 996f7ffbeb..8d06eb853f 100644
--- a/src/plugins/clangtools/clangtoolslogfilereader.h
+++ b/src/plugins/clangtools/clangtoolslogfilereader.h
@@ -34,16 +34,10 @@ namespace Utils { class FilePath; }
 namespace ClangTools {
 namespace Internal {
 
-enum class OutputFileFormat { Serialized, Yaml };
+enum class OutputFileFormat { Yaml };
 
 using AcceptDiagsFromFilePath = std::function<bool(const Utils::FilePath &)>;
 
-// Reads diagnostics generated by "clang -serialize-diagnostics path/to/file"
-Diagnostics readSerializedDiagnostics(const Utils::FilePath &logFilePath,
-                                      const Utils::FilePath &mainFilePath,
-                                      const AcceptDiagsFromFilePath &acceptFromFilePath,
-                                      QString *errorMessage);
-
 // Reads diagnostics generated by "clang-tidy/clazy-standalone -export-fixes=path/to/file"
 Diagnostics readExportedDiagnostics(const Utils::FilePath &logFilePath,
                                     const AcceptDiagsFromFilePath &acceptFromFilePath,
diff --git a/src/plugins/clangtools/clangtoolsutils.cpp b/src/plugins/clangtools/clangtoolsutils.cpp
index 7fbcc35889..661a2165d0 100644
--- a/src/plugins/clangtools/clangtoolsutils.cpp
+++ b/src/plugins/clangtools/clangtoolsutils.cpp
@@ -153,7 +153,6 @@ QString clazyStandaloneFallbackExecutable()
 {
     return findValidExecutable({
         shippedClazyStandaloneExecutable(),
-        qEnvironmentVariable("QTC_USE_CLAZY_STANDALONE_PATH"),
         Constants::CLAZY_STANDALONE_EXECUTABLE_NAME,
     });
 }
diff --git a/src/plugins/clangtools/settingswidget.cpp b/src/plugins/clangtools/settingswidget.cpp
index a095450d26..b2ef284641 100644
--- a/src/plugins/clangtools/settingswidget.cpp
+++ b/src/plugins/clangtools/settingswidget.cpp
@@ -95,20 +95,15 @@ SettingsWidget::SettingsWidget()
                      path,
                      "ClangTools.ClangTidyExecutable.History");
 
-    if (qEnvironmentVariable("QTC_USE_CLAZY_STANDALONE_PATH").isEmpty()) {
-        m_ui->clazyStandalonePathChooser->setVisible(false);
-        m_ui->clazyStandaloneLabel->setVisible(false);
-    } else {
-        placeHolderText = shippedClazyStandaloneExecutable();
-        path = m_settings->clazyStandaloneExecutable();
-        if (path.isEmpty() && placeHolderText.isEmpty())
-            path = Constants::CLAZY_STANDALONE_EXECUTABLE_NAME;
-        setupPathChooser(m_ui->clazyStandalonePathChooser,
-                         tr("Clazy Executable"),
-                         placeHolderText,
-                         path,
-                         "ClangTools.ClazyStandaloneExecutable.History");
-    }
+    placeHolderText = shippedClazyStandaloneExecutable();
+    path = m_settings->clazyStandaloneExecutable();
+    if (path.isEmpty() && placeHolderText.isEmpty())
+        path = Constants::CLAZY_STANDALONE_EXECUTABLE_NAME;
+    setupPathChooser(m_ui->clazyStandalonePathChooser,
+                     tr("Clazy Executable"),
+                     placeHolderText,
+                     path,
+                     "ClangTools.ClazyStandaloneExecutable.History");
 
     //
     // Group box "Run Options"