Hi, As visible on seawasp (and noticed here in passing, while hacking on the opaque pointer changes for bleeding edge LLVM), Clang 15 now warns by default about our use of tree walkers functions with no function prototype, because the next revision of C (C23?) will apparently be harmonising with C++ in interpreting f() to mean f(void), not f(anything goes).
nodeFuncs.c:2051:17: warning: passing arguments to a function without a prototype is deprecated in all versions of C and is not supported in C2x [-Wdeprecated-non-prototype] return walker(((WithCheckOption *) node)->qual, context); Discussion trail: https://reviews.llvm.org/D123456 https://discourse.llvm.org/t/rfc-enabling-wstrict-prototypes-by-default-in-c/60521 http://www.open-std.org/jtc1/sc22/wg14/www/docs/n2841.htm Not sure where to see the official status of N2841 (other than waiting for the next draft to pop out), but on random/unofficial social media I saw that it was accepted in February, and the Clang people apparently think it's in and I also saw a rumour that bleeding edge GCC takes this view if you run with -std=c2x (not tested by me).