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For compatibility with SVR4, GCC supports a set of #pragma
directives for declaring symbols to be weak, and defining weak
aliases.
#pragma weak symbol
This pragma declares symbol
to be weak, as if the declaration
had the attribute of the same name. The pragma may appear before
or after the declaration of symbol
. It is not an error for
symbol
to never be defined at all.
#pragma weak symbol1 = symbol2
This pragma declares symbol1
to be a weak alias of symbol2
.
It is an error if symbol2
is not defined in the current
translation unit.