Andy WingoMar 13

me: i wish we could have tail calls in c
gcc: we have tail calls at home
the tail calls:

https://godbolt.org/z/GT5PvnxP9

Show threadAndy WingoMar 13
a kind person shares this powerful incantation: `if (1) [[gnu::musttail]]` https://godbolt.org/z/f8fzf9b5M
Compiler Explorer - C (x86-64 gcc 15.2)

int f(void); static int g(void) { return f(); return 11; } static int h(void) { if (1) [[gnu::musttail]] return f(); return 42; }

Show threadAndy WingoMar 13
lol gcc's tail call implementation is extraordinarily squirrely, it happily inlines functions that do tail calls but then dies because it fails to turn the inlined tail calls into regular calls. (clang fails in different ways :P)
Show threadAndy WingoMar 13
"cannot tail-call: other reasons" this energy is sending meeeeee, the compiler has determined that it is friday
Show threadAlex Celeste, Princess Consort of Burnout
@wingo per TS25007 "unspecified other reasons" is conforming
Mar 13 at 12:28pmWeb