6.62.11 Weak Pragmas
For compatibility with SVR4, GCC supports a set of
directives for declaring symbols to be weak, and defining weak aliases.
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.
- 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.