Don't expand object-like macro when preprocessing in fast-mode.

src/libs/cplusplus/pp-engine.cpp

@@ -818,6 +818,17 @@ void Preprocessor::preprocess(const QString &fileName, const QByteArray &source,
 
                 const QByteArray spell = tokenSpell(*identifierToken);
                 if (! _expandMacros) {
+                    if (! env->isBuiltinMacro(spell)) {
+                        Macro *m = env->resolve(spell);
+                        if (m && ! m->isFunctionLike()) {
+                            QByteArray expandedDefinition;
+                            expandObjectLikeMacro(identifierToken, spell, m, &expandedDefinition);
+                            if (expandedDefinition.trimmed().isEmpty()) {
+                                out(QByteArray(spell.length(), ' '));
+                                continue;
+                            }
+                        }
+                    }
                     out(spell);
                     continue;
                 }