The warning when building for FreeBSD and OpenBSD

[yanecc]

Bug Report

When I built for FreeBSD with GitHub Actions, I noticed a warning from the compiler.

cc: warning: argument unused during compilation: '-rdynamic' [-Wunused-command-line-argument]

https://github.com/yanecc/MockGPT/actions/runs/8981357271/job/24666718448#step:3:1628
crystal 1.10.1

[yanecc]

The same warnings with OpenBSD
https://github.com/yanecc/MockGPT/actions/runs/8981357271/job/24666719117#step:3:1333
crystal 1.4.1

[ysbaddaden]

This is clang complaining that -rdynamic is unused because of the --static compilation flag. I can't reproduce on Linux (gnu or musl) with CC=clang-17 and passing --link-flags="-Wunused-command-line-argument".

[yanecc]

It seems exclusive to the BSD-like os.

[straight-shoota]

I suppose we can skip -rdynamic on BSDs when linking statically?
Would still be interesting to figure out the exact conditions for this (like why doesn't it reproduce on linux?).