Reason for rpath usage on arm64

[Ken Cunningham]

Oh, nothing whatsoever to do with arm64 specifically. This is going to
affect all gcc builds on all darwin-supported architectures once Iain
pushes it through to all the branches he plans to keep supporting.

On Tue, May 24, 2022 at 9:50 AM Joshua Root <jmr at macports.org> wrote:

> On 2022-5-25 01:22 , Ken Cunningham wrote:
> >> Does anyone know why things seem to be using rpath on arm64 builds
> >
> > Basically, it comes down to the fact that Apple has disallowed
> > DYLD_LIBRARY_PATH to work on newer systems.
>
> This is the first I've heard of it. Is this supposed to be the case only
> on arm64? I know DYLD_* variables are ignored when running SIP-flagged
> executables, but that wouldn't apply to something that has just been built.
>
> We use DYLD_LIBRARY_PATH in our own build system:
> <https://github.com/macports/macports-base/blob/master/vendor/tclsh.in>
>
> - Josh
>
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