CppTools: Predefine __func__ and friends

...so the built-in parser can handle them.

Change-Id: Iff69638f8939c3c4dced99699a3357dd94b23c71
Task-number: QTCREATORBUG-15431
Reviewed-by: Erik Verbruggen <erik.verbruggen@theqtcompany.com>

src/plugins/cpptools/builtineditordocumentparser.cpp

@@ -32,12 +32,29 @@
 #include "cppsourceprocessor.h"
 #include "editordocumenthandle.h"
 
+#include <projectexplorer/projectexplorerconstants.h>
+
 #include <utils/qtcassert.h>
 
 using namespace CPlusPlus;
 using namespace CppTools;
 using namespace CppTools::Internal;
 
+static QByteArray overwrittenToolchainDefines(const ProjectPart &projectPart)
+{
+    QByteArray defines;
+
+    // MSVC's predefined macros like __FUNCSIG__ expand to itself.
+    // We can't parse this, so redefine to the empty string literal.
+    if (projectPart.toolchainType == ProjectExplorer::Constants::MSVC_TOOLCHAIN_TYPEID) {
+        defines += "#define __FUNCSIG__ \"\"\n"
+                   "#define __FUNCDNAME__ \"\"\n"
+                   "#define __FUNCTION__ \"\"\n";
+    }
+
+    return defines;
+}
+
 BuiltinEditorDocumentParser::BuiltinEditorDocumentParser(const QString &filePath)
     : BaseEditorDocumentParser(filePath)
 {
@@ -74,6 +91,7 @@ void BuiltinEditorDocumentParser::updateHelper(const InMemoryInfo &info)
 
     if (const ProjectPart::Ptr part = baseState.projectPart) {
         configFile += part->toolchainDefines;
+        configFile += overwrittenToolchainDefines(*part.data());
         configFile += part->projectDefines;
         headerPaths = part->headerPaths;
         projectConfigFile = part->projectConfigFile;

src/plugins/cpptools/cppmodelmanager.cpp

@@ -190,6 +190,12 @@ const char pp_configuration[] =
 
     "#define _Pragma(x)\n" // C99 _Pragma operator
 
+    "#define __func__ \"\"\n"
+
+    // ### add macros for gcc
+    "#define __PRETTY_FUNCTION__ \"\"\n"
+    "#define __FUNCTION__ \"\"\n"
+
     // ### add macros for win32
     "#define __cdecl\n"
     "#define __stdcall\n"