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7.12 .desc symbol, abs-expression

This directive sets the descriptor of the symbol (see section 5.5 Symbol Attributes) to the low 16 bits of an absolute expression.

The `.desc' directive is not available when as is configured for COFF output; it is only for a.out or b.out object format. For the sake of compatibility, as accepts it, but produces no output, when configured for COFF.