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

[lucier at math dot purdue.edu via Gcc-bugs]

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

--- Comment #8 from lucier at math dot purdue.edu ---
What I have in mind is along the lines of the patch I proposed here:

https://gcc.gnu.org/pipermail/gcc-patches/2023-August/626368.html

That adds a warning to -Wdisabled-optimization for when a call in tail call
position is not optimized with -foptimize-sibling-calls.  That email has
statistics about how often the warning was triggered when building stage1.

I think that that warning would be, if anything, more useful now.