9ec238d0f3
LLD enables ZERO_AR_DATE by default, setting it to zero would enable non-determinism, setting it to any other value is ignored. See: https://github.com/llvm/llvm-project/blob/main/lld/docs/MachO/ld64-vs-lld.rst. |
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| .. | ||
| detached-sig-create.sh | ||
| gen-sdk | ||
| LICENSE | ||
| macdeployqtplus | ||
| README.md | ||
MacOS Deployment
The macdeployqtplus script should not be run manually. Instead, after building as usual:
make deploy
When complete, it will have produced Bitcoin-Core.zip.
SDK Extraction
Step 1: Obtaining Xcode.app
A free Apple Developer Account is required to proceed.
Our macOS SDK can be extracted from Xcode_15.xip.
Alternatively, after logging in to your account go to 'Downloads', then 'More'
and search for Xcode 15.
An Apple ID and cookies enabled for the hostname are needed to download this.
The sha256sum of the downloaded XIP archive should be 4daaed2ef2253c9661779fa40bfff50655dc7ec45801aba5a39653e7bcdde48e.
To extract the .xip on Linux:
# Install/clone tools needed for extracting Xcode.app
apt install cpio
git clone https://github.com/bitcoin-core/apple-sdk-tools.git
# Unpack the .xip and place the resulting Xcode.app in your current
# working directory
python3 apple-sdk-tools/extract_xcode.py -f Xcode_15.xip | cpio -d -i
On macOS:
xip -x Xcode_15.xip
Step 2: Generating the SDK tarball from Xcode.app
To generate the SDK, run the script gen-sdk with the
path to Xcode.app (extracted in the previous stage) as the first argument.
./contrib/macdeploy/gen-sdk '/path/to/Xcode.app'
The generated archive should be: Xcode-15.0-15A240d-extracted-SDK-with-libcxx-headers.tar.gz.
The sha256sum should be c0c2e7bb92c1fee0c4e9f3a485e4530786732d6c6dd9e9f418c282aa6892f55d.
Deterministic macOS App Notes
macOS Applications are created in Linux using a recent LLVM.
Apple uses clang extensively for development and has upstreamed the necessary
functionality so that a vanilla clang can take advantage. It supports the use of -F,
-target, -mmacosx-version-min, and -isysroot, which are all necessary when
building for macOS.
To complicate things further, all builds must target an Apple SDK. These SDKs are free to download, but not redistributable. See the SDK Extraction notes above for how to obtain it.
The Guix process builds 2 sets of files: Linux tools, then Apple binaries which are created using these tools. The build process has been designed to avoid including the SDK's files in Guix's outputs. All interim tarballs are fully deterministic and may be freely redistributed.
As of OS X 10.9 Mavericks, using an Apple-blessed key to sign binaries is a requirement in order to satisfy the new Gatekeeper requirements. Because this private key cannot be shared, we'll have to be a bit creative in order for the build process to remain somewhat deterministic. Here's how it works:
- Builders use Guix to create an unsigned release. This outputs an unsigned ZIP which users may choose to bless and run. It also outputs an unsigned app structure in the form of a tarball.
- The Apple keyholder uses this unsigned app to create a detached signature, using the script that is also included there. Detached signatures are available from this repository.
- Builders feed the unsigned app + detached signature back into Guix. It uses the pre-built tools to recombine the pieces into a deterministic ZIP.