mcount support??

[taeguk]

Is there mcount support in rustc??
Many profiling tools such as gprof and uftrace require mcount function. An user can use -pg option to add a mcount function call at the entry of each function in gcc or clang compiler.
Is there similar way to get same effect of using -pg option?

If there is no way to add the mcount function call, I want to suggest adding mcount support for utilizing existing profiling tools.

[steveklabnik]

Please ask questions on https://users.rust-lang.org/, we try to keep the issue tracker for bugs only. Thanks!

[sanxiyn]

This was a legitimate issue that shouldn't have been closed. mcount support got added in #57220.

@taeguk For better reception in the future, instead of "mcount support??", confidently write, "Support mcount". This was a feature that should be supported which rustc lacked. No need to be shy about that.

[taeguk]

@sanxiyn Okay, I got it. thanks :)