When compiling an application using the LP64 compiler option, you cannot use the TEST compiler option. You must instead use the DEBUG(FORMAT(DWARF)) compiler option.
When the GONUMBER compiler option is used with LP64, it will produce executables with additional debug information. This is used by Language Environment® to produce statement numbers in the Language Environment dump (CEEDUMP). Statement numbers in the CEEDUMP are also produced if the DEBUG compiler option or the c89 -g option is used.
For a detailed explanation of the debugging options for XL C/C++ and Inter-procedural Analysis (IPA), see z/OS XL C/C++ User's Guide and z/OS XL C/C++ Programming Guide.