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(as.info)Size

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`.size' (COFF version)
======================

   This directive is generated by compilers to include auxiliary
debugging information in the symbol table.  It is only permitted inside
`.def'/`.endef' pairs.

   `.size' is only meaningful when generating COFF format output; when
`as' is generating `b.out', it accepts this directive but ignores it.

`.size NAME , EXPRESSION' (ELF version)
=======================================

   This directive is used to set the size associated with a symbol NAME.
The size in bytes is computed from EXPRESSION which can make use of
label arithmetic.  This directive is typically used to set the size of
function symbols.