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7.86 .size

This directive is used to set the size associated with a symbol.

COFF Version

For COFF targets, the .size directive is only permitted inside .def/.endef pairs. It is used like this:

.size expression

ELF Version

For ELF targets, the .size directive is used like this:

.size name , expression

This directive sets 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.