This option creates a separate object file containing DWARF debug
information. It causes debug information to be split between the generated
object (.o) file and the new DWARF object (.dwo) file.
The DWARF object file is not used by the linker, so this reduces the amount
of debug information the linker must process and it results in a smaller
For this option to perform correctly, you must use binutils-2.24 or later.
To debug the resulting executable, you must use gdb-7.6.1 or later.
If you use the split executable with a tool that does
not support the split DWARF format, it will behave as though the DWARF debug
information is absent.