if you have the following pro-file:

TEMPLATE = app
TARGET =
DEPENDPATH += .
INCLUDEPATH += .

1. Input
   SOURCES += *.cc
   SOURCES += *.cpp

and you don't have any cpp files in that directory qmake will warn when you run it but the resulting Makefile will be invalid.

This should either be an error instead of a warning,
or (preferably) it should simply ignore this and not put anything concerning "*.cpp" into the Makefile.