XCOFF ( Extended Common Object File Format) defined by IBM and used in AIX, is an improved and expanded version of the
IBM's description of XCOFF
XCOFF additions include the use of CSECTs to provide subsection granularity of cross-references, and the use of stabs for debugging. Information for the handling of shared library is also more elaborate than for plain COFF.
More recently, IBM defined an XCOFF64 version supporting 64-bit IBM AIX, and used XCOFF32 to mean the original file format.
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