Setting the SDK root by default allows `overrideSDK` to correctly set
the SDK version when using a different SDK. It also allows the correct
SDK version to be set when using an older deployment target. Not setting
the correct SDK version can result in unexpected behavior at runtime.
Examples:
* Automatic dark mode switching requires linking against an SDK version
of 10.14 or newer. With the current behavior, the only way to do this
is by using a 10.14+ deployment target even when the application
supports older platforms when build with a newer SDK.
* MetalD3D checks that the system version is at least 14.0. The API it
uses returns a compatibility version when the the SDK is older than
11.0, which causes it to display an error and terminate the
application even when even when its requirements are all met.
This is effectively a rewrite of `overrideSDK`. It was required because
`wrapGAppsHook` propagates `depsTargetTarget` with the expectation that
it will effectively be `buildInputs` when the hook is itself used as a
`nativeBuildInput`. This propagates Gtk, which itself propagates the
default Dariwn SDK, making it effectively impossible to override the SDK
when a package depends on Gtk and uses `wrapGAppsHook`.
This rewrite implements the following improvements:
* Cross-compilation should be supported correctly (untested);
* Supports public and private frameworks;
* Supports SDK `libs`;
* Remaps instead of replacing extra (native) build inputs in the stdenv;
* Updates any Darwin framework references in `nix-support`; and
* It updates `xcodebuild` regardless of which input its in.
The implementation avoids recursion for performance reasons. Instead, it
enumerates transitive dependencies and walks the list from the leaf
packages backwards to the parent packages.
- update the hashes and tools needed to extract the bootstrap-tools archive
- unify the x64 and aarch64 unpack process
- unpin libxml for python-minimal
`finalAttrs` is never the first argument. This should have been
called `prevAttrs` all along.
It confused me for a bit, because the callback _must not_ be strict
in `finalAttrs` (the first of _two_ parameters), or it will
recurse infinitely while trying to figure out what the attrNames are.
- unpin LLVM11. fix discrepancy with freshBootstrapTools and the tools
built on hydra. pinning the stdenv for the hydra build doesn't pin the
tools as the included packages are able to change.
- remove unused LLVM tools & libs which reduces the uncompressed and
compressed file sizes by more than 1/2. compressed tarball is now 40M
and uncompressed is around 200M
- add @loader_path/. to dylibs that reference other libs in the archive.
this is needed for libraries with re-exports.
- validate shared objects with @rpath references contain the reference
in lib
- add a test to verify that the @loader_path/ works for libc++ as it
re-exports libc++abi
The Darwin bootstrap currently requires curl, but it is not strictly
required. The bootstrap requires it for two things:
* Fetchers; and
* As a transitive dependency of llvm-manpages (via Sphinx).
For the fetchers, the bootstrap curl can be used. For hatch-vcs, the
dependency, its tests can be disabled. Doing this allows curl to be
dropped from the Darwin stdenv bootstrap.
