Having this would have been, or would be, useful on multiple occassions:
- Homebrew/homebrew-core#94724
- Homebrew/homebrew-core#136551
- #15372
I think it's time that we added this back.
This implements the TODO that I left as a comment from #15722.
In order to simplify the handling of deleting an absolute rpath that has
a relative duplicate (or vice-versa, i.e., a relative rpath with an
absolute duplicate), we relocate all rpaths first in one pass and then
delete the duplicates in a separate pass.
We currently rely on some lower-level (but still public) methods from
ruby-macho since the standard `#delete_rpath` method changes the order
in which rpaths are resolved. We can switch back to using
`#delete_rpath` when Homebrew/ruby-macho#555 is merged and released.
This should fix the failures seen for `julia` in Homebrew/core.[^1]
I've detailed a better/more comprehensive fix as a `TODO` in a comments.
However, the problems that the better fix would avoid are comparatively
unlikely, so I think we can try this one out for now while I work on
implementing the said fix.
[^1]: https://github.com/Homebrew/homebrew-core/pull/135398#issuecomment-1643041541
Doing `change_rpath(old, new, file)` will error if `new` is already an
rpath for `file`. When this happens, `old` is no longer needed, so we
can delete it.
Fixes a build failure at shivammathur/homebrew-php#1848.
Some formulae (e.g. `php`) use rpaths that reference Cellar paths
belonging to other formulae. Let's make sure these rpaths don't break by
making them use opt paths instead.
Many (~60) formulae in Homebrew/core set this manually to prevent the
`openssl` Rust crate from vendoring OpenSSL.
Let's make handling this simpler by setting it globally instead.
Stuff built by CMake evades this check because CMake normalises
`/private/tmp` (which is the default `HOMEBREW_TEMP`) to `/tmp`. See
https://gitlab.kitware.com/cmake/cmake/-/issues/23251.
Let's fix that my taking this into account when `HOMEBREW_TEMP` is
`/private/tmp`.
