QtCreator reports "file: lib/libtest.a has no symbols" as error in Issues window after installing Xcode 6

QtCreator reports "file: lib/libtest.a has no symbols" when building static library after installing Xcode 6.

The static library builds ok, as not having any symbols in a cpp file is not an error, but QtCreator shows it as an error in Issues window. This shouldn't happen.

Example output:
[...]
ranlib: file: lib/libtest.a(Test0.cpp.o) has no symbols
ranlib: file: lib/libtest.a(Test1.cpp.o) has no symbols
ranlib: file: lib/libtest.a(Test2.cpp.o) has no symbols
ranlib: file: lib/libtest.a(Test3.cpp.o) has no symbols
ranlib: file: lib/libtest.a(Test4.cpp.o) has no symbols
[...]

Errors in Issues window:
file: lib/libtest.a(Test0.cpp.o) has no symbols
file: lib/libtest.a(Test1.cpp.o) has no symbols
file: lib/libtest.a(Test2.cpp.o) has no symbols
file: lib/libtest.a(Test3.cpp.o) has no symbols
file: lib/libtest.a(Test4.cpp.o) has no symbols