ClangTools: Use resource dir from tool instead of hard-coded one

This makes it more likely that using other clang-tidy and clazy binaries
than the ones shipped with Qt Creator will work.

Done-with: Nikolai Kosjar
Fixes: QTCREATORBUG-23672
Change-Id: I8c44e037ca8d50505fe10032034edaf4f408d52c
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/clangtools/clangtoolruncontrol.cpp

@@ -31,6 +31,7 @@
 #include "clangtoolsprojectsettings.h"
 #include "clangtoolssettings.h"
 #include "clangtoolsutils.h"
+#include "executableinfo.h"
 
 #include <debugger/analyzer/analyzerconstants.h>
 
@@ -153,7 +154,8 @@ private:
      bool m_success = false;
 };
 
-static AnalyzeUnits toAnalyzeUnits(const FileInfos &fileInfos)
+static AnalyzeUnits toAnalyzeUnits(const FileInfos &fileInfos, const FilePath &clangResourceDir,
+                                   const QString &clangVersion)
 {
     AnalyzeUnits unitsToAnalyze;
     const UsePrecompiledHeaders usePrecompiledHeaders = CppTools::getPchUsage();
@@ -163,8 +165,8 @@ static AnalyzeUnits toAnalyzeUnits(const FileInfos &fileInfos)
                                               UseTweakedHeaderPaths::Yes,
                                               UseLanguageDefines::No,
                                               UseBuildSystemWarnings::No,
-                                              QString(CLANG_VERSION),
-                                              QString(CLANG_RESOURCE_DIR));
+                                              clangVersion,
+                                              clangResourceDir.toString());
         QStringList arguments = extraClangToolsPrependOptions();
         arguments.append(optionsBuilder.build(fileInfo.kind, usePrecompiledHeaders));
         arguments.append(extraClangToolsAppendOptions());
@@ -174,11 +176,12 @@ static AnalyzeUnits toAnalyzeUnits(const FileInfos &fileInfos)
     return unitsToAnalyze;
 }
 
-AnalyzeUnits ClangToolRunWorker::unitsToAnalyze()
+AnalyzeUnits ClangToolRunWorker::unitsToAnalyze(const FilePath &clangResourceDir,
+                                                const QString &clangVersion)
 {
     QTC_ASSERT(m_projectInfo.isValid(), return AnalyzeUnits());
 
-    return toAnalyzeUnits(m_fileInfos);
+    return toAnalyzeUnits(m_fileInfos, clangResourceDir, clangVersion);
 }
 
 static QDebug operator<<(QDebug debug, const Utils::Environment &environment)
@@ -285,7 +288,10 @@ void ClangToolRunWorker::start()
                   Utils::NormalMessageFormat);
 
     // Collect files
-    const AnalyzeUnits unitsToProcess = unitsToAnalyze();
+    const auto clangResourceDirAndVersion =
+            getClangResourceDirAndVersion(runControl()->runnable().executable);
+    const AnalyzeUnits unitsToProcess = unitsToAnalyze(clangResourceDirAndVersion.first,
+                                                       clangResourceDirAndVersion.second);
     qCDebug(LOG) << "Files to process:" << unitsToProcess;
 
     m_queue.clear();

src/plugins/clangtools/clangtoolruncontrol.h

@@ -93,7 +93,8 @@ private:
     QList<RunnerCreator> runnerCreators();
     template <class T> ClangToolRunner *createRunner();
 
-    AnalyzeUnits unitsToAnalyze();
+    AnalyzeUnits unitsToAnalyze(const Utils::FilePath &clangResourceDir,
+                                const QString &clangVersion);
     void analyzeNextFile();
 
     void handleFinished();

src/plugins/clangtools/executableinfo.cpp

@@ -31,6 +31,7 @@
 #include <utils/environment.h>
 #include <utils/synchronousprocess.h>
 
+#include <QDir>
 #include <QFileInfo>
 #include <QJsonArray>
 #include <QJsonDocument>
@@ -42,7 +43,9 @@ using namespace Utils;
 namespace ClangTools {
 namespace Internal {
 
-static QString runExecutable(const Utils::CommandLine &commandLine)
+enum class FailSilently { Yes, No };
+static QString runExecutable(const Utils::CommandLine &commandLine,
+                             FailSilently failSilently = FailSilently::No)
 {
     if (commandLine.executable().isEmpty() || !commandLine.executable().toFileInfo().isExecutable())
         return {};
@@ -52,8 +55,10 @@ static QString runExecutable(const Utils::CommandLine &commandLine)
     Environment::setupEnglishOutput(&env);
     cpp.setEnvironment(env.toStringList());
 
-    SynchronousProcessResponse response =  cpp.runBlocking(commandLine);
-    if (response.result != SynchronousProcessResponse::Finished || response.exitCode != 0) {
+    const SynchronousProcessResponse response = cpp.runBlocking(commandLine);
+    if (response.result != SynchronousProcessResponse::Finished
+            && (failSilently == FailSilently::No
+                || response.result != SynchronousProcessResponse::FinishedError)) {
         Core::MessageManager::write(response.exitMessage(commandLine.toUserOutput(), 10));
         Core::MessageManager::write(QString::fromUtf8(response.allRawOutput()));
         return {};
@@ -162,5 +167,50 @@ ClazyStandaloneInfo::ClazyStandaloneInfo(const QString &executablePath)
     , supportedChecks(querySupportedClazyChecks(executablePath))
 {}
 
+static FilePath queryResourceDir(const FilePath &clangToolPath)
+{
+    QString output = runExecutable(CommandLine(clangToolPath, {"someFilePath", "--",
+                                                               "-print-resource-dir"}),
+                                   FailSilently::Yes);
+
+    // Expected output is (clang-tidy 10):
+    //   lib/clang/10.0.1
+    //   Error while trying to load a compilation database:
+    //   ...
+
+    // Parse
+    QTextStream stream(&output);
+    const QString path = clangToolPath.parentDir().parentDir()
+            .pathAppended(stream.readLine()).toString();
+    const auto filePath = FilePath::fromUserInput(QDir::cleanPath(path));
+    if (filePath.exists())
+        return filePath;
+    return {};
+}
+
+static QString queryVersion(const FilePath &clangToolPath)
+{
+    QString output = runExecutable(CommandLine(clangToolPath, {"--version"}));
+    QTextStream stream(&output);
+    while (!stream.atEnd()) {
+        static const QStringList versionPrefixes{"LLVM version ", "clang version: "};
+        const QString line = stream.readLine().simplified();
+        for (const QString &prefix : versionPrefixes) {
+            if (line.startsWith(prefix))
+                return line.mid(prefix.length());
+        }
+    }
+    return {};
+}
+
+QPair<FilePath, QString> getClangResourceDirAndVersion(const FilePath &clangToolPath)
+{
+    const FilePath dynamicResourceDir = queryResourceDir(clangToolPath);
+    const QString dynamicVersion = queryVersion(clangToolPath);
+    if (dynamicResourceDir.isEmpty() || dynamicVersion.isEmpty())
+        return qMakePair(FilePath::fromString(CLANG_RESOURCE_DIR), QString(CLANG_VERSION));
+    return qMakePair(dynamicResourceDir, dynamicVersion);
+}
+
 } // namespace Internal
 } // namespace ClangTools

src/plugins/clangtools/executableinfo.h

@@ -25,12 +25,17 @@
 
 #pragma once
 
+#include <utils/fileutils.h>
+
+#include <QPair>
 #include <QStringList>
 #include <QVector>
 
 namespace ClangTools {
 namespace Internal {
 
+QPair<Utils::FilePath, QString> getClangResourceDirAndVersion(const Utils::FilePath &clangToolPath);
+
 class ClangTidyInfo
 {
 public: