1 files changed, 3 insertions, 3 deletions
diff --git a/src/lib/corelib/tools/clangclinfo.cpp b/src/lib/corelib/tools/clangclinfo.cpp
index a9a1cb449..fd907ebf1 100644
--- a/src/lib/corelib/tools/clangclinfo.cpp
+++ b/src/lib/corelib/tools/clangclinfo.cpp
@@ -47,7 +47,7 @@ static std::vector<MSVCInstallInfo> compatibleMsvcs(Logger &logger)
             return true;
         bool ok = false;
         const int major = versions.at(0).toInt(&ok);
-        return !(ok && major >= 15); // support MSVC2017 and above
+        return !ok || major < 15; // support MSVC2017 and above
     };
     Internal::removeIf(msvcs, filter);
     for (const auto &msvc: msvcs) {
@@ -61,7 +61,7 @@ static std::vector<MSVCInstallInfo> compatibleMsvcs(Logger &logger)
 static QString findCompatibleVcsarsallBat(const std::vector<MSVCInstallInfo> &msvcs)
 {
     for (const auto &msvc: msvcs) {
-        const auto vcvarsallPath = msvc.findVcvarsallBat();
+        auto vcvarsallPath = msvc.findVcvarsallBat();
         if (!vcvarsallPath.isEmpty())
             return vcvarsallPath;
     }
@@ -121,7 +121,7 @@ std::vector<ClangClInfo> ClangClInfo::installedCompilers(
     if (registry.contains(key)) {
         const auto compilerPath = QDir::fromNativeSeparators(registry.value(key).toString())
                 + QStringLiteral("/bin/") + compilerName;
-        if (QFileInfo::exists(compilerPath))
+        if (QFileInfo::exists(compilerPath) && !contains(compilerPaths, compilerPath))
             compilerPaths.push_back(compilerPath);
     }