Extracting user's macros from .config file hilariously broken

There's some code in qt-creator/src/plugins/clangcodemodel/clangutils.cpp createClangOptions which uses ProjectPart to get project defines:

QStringList result;
(...)
result << buildDefines(pPart->projectDefines, false);
(...)
foreach (const QString &arg, result)
        qDebug() << "\t" << qPrintable(arg);

This is what it prints for the following $PROJECT.config content:

// ADD PREDEFINED MACROS HERE!

-DREDEFINED=MACROS HERE!

// ADD PREDEFINED MACROS HERE!
-DCOMPILER_MSVC

-DREDEFINED=MACROS HERE!
-DER_MSVC
(okay, I guess that's not how you add macros to the project, still funny)

// ADD PREDEFINED MACROS HERE!
#define COMPILER_MSVC

-DREDEFINED=MACROS HERE!
-DCOMPILER_MSVC
(almost correct!)

// ADD PREDEFINED MACROS HERE!
#define    COMPILER_MSVC

-DREDEFINED=MACROS HERE!
-D= COMPILER_MSVC

This garbage is then fed to clang, which uses it for parsing source files