Clang*: Workaround parsing mingw's <type_traits> with clang 3.9

...for -std=gnu++0x.

Define the unknown identifier/type "__float128" so at least the headers can be
parsed successfully. Of course this does not help for parsing client code
referencing that identifier, but this should be the less common case.

Task-number: QTCREATORBUG-17126
Change-Id: Id321311713029d8aa77e068b02361d86debfada6
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>

src/plugins/clangcodemodel/clangutils.cpp

@@ -96,6 +96,7 @@ public:
         optionsBuilder.enableExceptions();
 
         optionsBuilder.addDefineToAvoidIncludingGccOrMinGwIntrinsics();
+        optionsBuilder.addDefineFloat128ForMingw();
         optionsBuilder.addToolchainAndProjectDefines();
         optionsBuilder.undefineCppLanguageFeatureMacrosForMsvc2015();
 

src/plugins/clangrefactoring/refactoringcompileroptionsbuilder.cpp

@@ -130,6 +130,7 @@ Utils::SmallStringVector RefactoringCompilerOptionsBuilder::build(CppTools::Proj
     optionsBuilder.addOptionsForLanguage(/*checkForBorlandExtensions*/ true);
     optionsBuilder.enableExceptions();
 
+    optionsBuilder.addDefineFloat128ForMingw();
     optionsBuilder.addDefineToAvoidIncludingGccOrMinGwIntrinsics();
     optionsBuilder.addToolchainAndProjectDefines();
     optionsBuilder.undefineCppLanguageFeatureMacrosForMsvc2015();

src/plugins/clangstaticanalyzer/clangstaticanalyzerruncontrol.cpp

@@ -175,6 +175,7 @@ public:
         optionsBuilder.addOptionsForLanguage(false);
         optionsBuilder.enableExceptions();
 
+        optionsBuilder.addDefineFloat128ForMingw();
         optionsBuilder.addDefineToAvoidIncludingGccOrMinGwIntrinsics();
         const Core::Id type = projectPart.toolchainType;
         if (type != ProjectExplorer::Constants::MSVC_TOOLCHAIN_TYPEID)

src/plugins/cpptools/compileroptionsbuilder.cpp

@@ -368,6 +368,14 @@ void CompilerOptionsBuilder::undefineCppLanguageFeatureMacrosForMsvc2015()
     }
 }
 
+void CompilerOptionsBuilder::addDefineFloat128ForMingw()
+{
+    // TODO: Remove once this is fixed in clang >= 3.9.
+    // https://llvm.org/bugs/show_bug.cgi?id=30685
+    if (m_projectPart.toolchainType == ProjectExplorer::Constants::MINGW_TOOLCHAIN_TYPEID)
+        addDefine("#define __float128 void");
+}
+
 QString CompilerOptionsBuilder::includeOption() const
 {
     return QLatin1String("-I");

src/plugins/cpptools/compileroptionsbuilder.h

@@ -58,6 +58,8 @@ public:
     void addMsvcCompatibilityVersion();
     void undefineCppLanguageFeatureMacrosForMsvc2015();
 
+    void addDefineFloat128ForMingw();
+
 protected:
     virtual bool excludeDefineDirective(const QByteArray &defineDirective) const;
     virtual bool excludeHeaderPath(const QString &headerPath) const;