Ruby  3.1.4p223 (2023-03-30 revision HEAD)
weakref.h
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1 #ifndef RBIMPL_ATTR_WEAKREF_H /*-*-C++-*-vi:se ft=cpp:*/
2 #define RBIMPL_ATTR_WEAKREF_H
24 
26 #if RBIMPL_HAS_ATTRIBUTE(weakref)
27 # define RBIMPL_ATTR_WEAKREF(sym) __attribute__((__weakref__(# sym)))
28 #else
29 # define RBIMPL_ATTR_WEAKREF(sym) /* void */
30 #endif
31 
32 #endif /* RBIMPL_ATTR_WEAKREF_H */
Defines RBIMPL_HAS_ATTRIBUTE.