[Bug tree-optimization/119718] __attribute__((musttail)) affects whether -foptimize-tail-calls will in fact optimize a tail call

[jakub at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119718

--- Comment #9 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
You can get some of it already from vanilla trunk,
-fdump-tree-tailc=/dev/stderr 2>&1 | grep '^Cannot convert:'
That is for spots where for musttail calls the pass would error as well.
This doesn't cover the expansion ones though.