Hopefully it'd at least be syntactically similar, so we can have an #ifdef __STDC_CLEANUP__ #define my_cleanup(func) stdc_cleanup(func) #else #define m

Hopefully it'd at least be syntactically similar, so we can have an #ifdef __STDC_CLEANUP__ #define my_cleanup(func) stdc_cleanup(func) #else #define my_cleanup(func) __attribute__((cleanup(func))) #endif i.e. it would require that it at least goes in the same places as an attribute.