__has_attribute __has_builtin __has_extension __has_feature P99_ATLEAST P99_CONST_FUNCTION P99_DEPRECATED P99_EXPECT p99_extension P99_FIXED_REGISTER p99_has_attribute p99_has_builtin p99_has_extension p99_has_feature P99_IF_COMPILER p99_inline P99_LIKELY P99_MACRO_END P99_PARALLEL_PRAGMA P99_PURE_FUNCTION P99_SETJMP_INLINE P99_STRINGIFY P99_TENTATIVE_DEC P99_TENTATIVE_DEF P99_UNLIKELY P99_VECTOR P99_WARN_UNUSED_RESULT P99_WEAK static_inline

P99_WEAK #define P99_WEAK (   ... )    P99_IF_LT(P99_NARG(__VA_ARGS__), 2)(P00_WEAK1(__VA_ARGS__))(P00_WEAK2(__VA_ARGS__)) Declare a symbol to be weak such that it can be provided several times without error. This should be placed before the corresponding declaration and receive the name of the symbol as an argument. Such as P99_WEAK(toto) unsigned toto; To have maximum portability this should immediately precede the definition. Another form would be P99_WEAK(func, _func) unsigned func(void); By that all references to func would use _func, instead. Remarks This feature seems to be widely supported. We have seen it mentioned for gcc and relatives, IBM, SGI, HP, SUN, Diab, Microsoft Definition at line 561 of file p99_compiler.h.