If you use GCC you can use "-E" option to run the preprocessor, but stop before compilation and linking. Then you can open and read the result in a text editor.
Ok I set -E in the "other compiler options" bymyself.
What file should I open? Do you mean the object (*.o) file?
It starts with lines like this
# 1 "E:\\Garage\\projekte\\OctopusBackup\\OBCore.cpp"
# 1 "E:\\Garage\\projekte\\OctopusBackup//"
# 1 "<built-in>"
# 1 "<command line>"
# 1 "E:\\Garage\\projekte\\OctopusBackup\\OBCore.cpp"
Is this the file you mean?