<p dir="auto">On current master (on macOS), I get these warnings when building Julia. I suppose they are safe to ignore.</p>
<div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="    LINK usr/lib/julia/sys.dylib
ld: warning: could not create compact unwind for _julia_Dict_17462: stack subq instruction is too different from dwarf stack size
ld: warning: could not create compact unwind for _julia_Dict_17470: stack subq instruction is too different from dwarf stack size
➜  julia git:(master) ./julia
               _
   _       _ _(_)_     |  Documentation: https://docs.julialang.org
  (_)     | (_) (_)    |
   _ _   _| |_  __ _   |  Type &quot;?&quot; for help, &quot;]?&quot; for Pkg help.
  | | | | | | |/ _` |  |
  | | |_| | | | (_| |  |  Version 1.8.0-DEV.86 (2021-06-28)
 _/ |\__'_|_|_|\__'_|  |  Commit 74fab49ffb (0 days old master)
|__/                   |
"><pre class="notranslate"><code class="notranslate">    LINK usr/lib/julia/sys.dylib
ld: warning: could not create compact unwind for _julia_Dict_17462: stack subq instruction is too different from dwarf stack size
ld: warning: could not create compact unwind for _julia_Dict_17470: stack subq instruction is too different from dwarf stack size
➜  julia git:(master) ./julia
               _
   _       _ _(_)_     |  Documentation: https://docs.julialang.org
  (_)     | (_) (_)    |
   _ _   _| |_  __ _   |  Type "?" for help, "]?" for Pkg help.
  | | | | | | |/ _` |  |
  | | |_| | | | (_| |  |  Version 1.8.0-DEV.86 (2021-06-28)
 _/ |\__'_|_|_|\__'_|  |  Commit 74fab49ffb (0 days old master)
|__/                   |

</code></pre></div>
<p dir="auto">On macOS 10.14.6, I've started to get these warning when building Julia, at the very end:</p>
<div class="snippet-clipboard-content notranslate position-relative overflow-auto" data-snippet-clipboard-copy-content="$ make
...
    LINK usr/lib/julia/sys.dylib
ld: warning: could not create compact unwind for _julia_Dict_16937: stack subq instruction is too different from dwarf stack size
ld: warning: could not create compact unwind for _julia_Dict_16945: stack subq instruction is too different from dwarf stack size
$"><pre class="notranslate"><code class="notranslate">$ make
...
    LINK usr/lib/julia/sys.dylib
ld: warning: could not create compact unwind for _julia_Dict_16937: stack subq instruction is too different from dwarf stack size
ld: warning: could not create compact unwind for _julia_Dict_16945: stack subq instruction is too different from dwarf stack size
$
</code></pre></div>
<p dir="auto">This also happens in the release-1.7 branch, but not in release-1.6, and also didn't happen like a month or so ago.</p>