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8.20.3 Directives for debugging information

mips ecoff as supports several directives used for generating debugging information which are not support by traditional mips assemblers. These are .def, .endef, .dim, .file, .scl, .size, .tag, .type, .val, .stabd, .stabn, and .stabs. The debugging information generated by the three .stab directives can only be read by gdb, not by traditional mips debuggers (this enhancement is required to fully support C++ debugging). These directives are primarily used by compilers, not assembly language programmers!