Clang: Fix c++98-compat warnings for MSVC toolchain

Clang invoked with --driver-mode=cl will map "-Wall" to "-Weverything",
thus enabling -Wc++98-compat-pedantic and way more options.

Fix this by escaping "-Wall" in the cl mode, effectively passing in
"/clang:-Wall" instead of "-Wall".

This fixes what 5675169e56 addressed also
for ClangTools.

Change-Id: Ideb7bab923d0359e8039b61e9d53c8765de79c29
Reviewed-by: Cristian Adam <cristian.adam@qt.io>
Reviewed-by: Alessandro Portale <alessandro.portale@qt.io>

src/plugins/clangcodemodel/clangeditordocumentprocessor.cpp

@@ -441,6 +441,7 @@ public:
     {
         // Determine the driver mode from toolchain and flags.
         m_builder.evaluateCompilerFlags();
+        m_isClMode = m_builder.isClStyle();
 
         addLanguageOptions();
         addGlobalDiagnosticOptions(); // Before addDiagnosticOptions() so users still can overwrite.
@@ -498,7 +499,10 @@ private:
                                        ? CppTools::UseBuildSystemWarnings::Yes
                                        : CppTools::UseBuildSystemWarnings::No;
 
-        m_options.append(diagnosticConfig.clangOptions());
+        const QStringList options = m_isClMode
+                                        ? CppTools::clangArgsForCl(diagnosticConfig.clangOptions())
+                                        : diagnosticConfig.clangOptions();
+        m_options.append(options);
     }
 
     void addGlobalDiagnosticOptions()
@@ -537,6 +541,7 @@ private:
     Core::Id m_diagnosticConfigId;
     CppTools::UseBuildSystemWarnings m_useBuildSystemWarnings = CppTools::UseBuildSystemWarnings::No;
     CppTools::CompilerOptionsBuilder m_builder;
+    bool m_isClMode = false;
     QStringList m_options;
 };
 } // namespace

src/plugins/clangtools/clangtidyclazyrunner.cpp

@@ -48,11 +48,16 @@ using namespace CppTools;
 namespace ClangTools {
 namespace Internal {
 
+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 (baseOptions.contains("--driver-mode=cl"))
+    if (isClMode(baseOptions))
         return clangArgsForCl(serializeArgs);
     return serializeArgs;
 }
@@ -104,7 +109,8 @@ static QStringList clangArguments(const ClangDiagnosticConfig &diagnosticConfig,
 {
     QStringList arguments;
     arguments << ClangDiagnosticConfigsModel::globalDiagnosticOptions()
-              << diagnosticConfig.clangOptions()
+              << (isClMode(baseOptions) ? CppTools::clangArgsForCl(diagnosticConfig.clangOptions())
+                                        : diagnosticConfig.clangOptions())
               << baseOptions;
 
     if (LOG().isDebugEnabled())

src/plugins/cpptools/cpptoolsreuse.cpp

@@ -366,7 +366,6 @@ static void addBuiltinConfigs(ClangDiagnosticConfigsModel &model)
     config.setClangOptions({
         "-Wall",
         "-Wextra",
-        "-Wno-c++98-compat"
     });
     model.appendOrUpdate(config);