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macdeploy: alternative info to download the macOS SDK
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The previous link wasn't accessible for me, this adds some instructions
given to me by Hebasto on #bitcoin-core-builds as well as a shasum for
the archive to quickly check the downloaded one is the right one before
processing with the entire Guix build.

This also corrects a link to an older version of the SDK currently in
use.

Signed-off-by: Antoine Poinsot <darosior@protonmail.com>
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darosior committed Jul 29, 2021
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Expand Up @@ -16,7 +16,10 @@ Our current macOS SDK
(`Xcode-12.1-12A7403-extracted-SDK-with-libcxx-headers.tar.gz`) can be
extracted from
[Xcode_12.1.xip](https://download.developer.apple.com/Developer_Tools/Xcode_12.1/Xcode_12.1.xip).
An Apple ID is needed to download this.
Alternatively, after logging in to your account go to 'Downloads', then 'More'
and look for [`Xcode_12.1`](https://download.developer.apple.com/Developer_Tools/Xcode_12.1/Xcode_12.1.xip).
An Apple ID and cookies enabled for the hostname are needed to download this.
The `sha256sum` of the archive should be `612443b1894b39368a596ea1607f30cbb0481ad44d5e29c75edb71a6d2cf050f`.

After Xcode version 7.x, Apple started shipping the `Xcode.app` in a `.xip`
archive. This makes the SDK less-trivial to extract on non-macOS machines. One
Expand Down Expand Up @@ -76,7 +79,7 @@ and its `libLTO.so` rather than those from `llvmgcc`, as it was originally done

To complicate things further, all builds must target an Apple SDK. These SDKs are free to
download, but not redistributable. To obtain it, register for an Apple Developer Account,
then download [Xcode_11.3.1](https://download.developer.apple.com/Developer_Tools/Xcode_11.3.1/Xcode_11.3.1.xip).
then download [Xcode_12.1](https://download.developer.apple.com/Developer_Tools/Xcode_12.1/Xcode_12.1.xip).

This file is many gigabytes in size, but most (but not all) of what we need is
contained only in a single directory:
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