(com_err.info)The error-table compiler

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4 The error-table compiler
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The error table compiler is named 'compile_et'.  It takes one argument,
the pathname of a file (ending in '.et', e.g., 'dsc_err.et') containing
an error table source file.  It parses the error table, and generates
two output files - a C header file ('discuss_err.h') which contains
definitions of the numerical values of the error codes defined in the
error table, and a C source file which should be compiled and linked
with the executable.  The header file must be included in the source of
a module which wishes to reference the error codes defined; the object
module generated from the C code may be linked in to a program which
wishes to use the printed forms of the error codes.