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diff --git a/doc/build-osx.md b/doc/build-osx.md index bf655538c7..86b5c5b602 100644 --- a/doc/build-osx.md +++ b/doc/build-osx.md @@ -113,96 +113,3 @@ tail -f $HOME/Library/Application\ Support/Bitcoin/debug.log * Tested on OS X 10.12 Sierra through macOS 10.15 Catalina on 64-bit Intel processors only. * Building with downloaded Qt binaries is not officially supported. See the notes in [#7714](https://github.com/bitcoin/bitcoin/issues/7714). - -## Deterministic macOS DMG Notes -Working macOS DMGs are created in Linux by combining a recent `clang`, the Apple -`binutils` (`ld`, `ar`, etc) and DMG authoring tools. - -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 `--sysroot`, which are all necessary when -building for macOS. - -Apple's version of `binutils` (called `cctools`) contains lots of functionality missing in the -FSF's `binutils`. In addition to extra linker options for frameworks and sysroots, several -other tools are needed as well such as `install_name_tool`, `lipo`, and `nmedit`. These -do not build under Linux, so they have been patched to do so. The work here was used as -a starting point: [mingwandroid/toolchain4](https://github.com/mingwandroid/toolchain4). - -In order to build a working toolchain, the following source packages are needed from -Apple: `cctools`, `dyld`, and `ld64`. - -These tools inject timestamps by default, which produce non-deterministic binaries. The -`ZERO_AR_DATE` environment variable is used to disable that. - -This version of `cctools` has been patched to use the current version of `clang`'s headers -and its `libLTO.so` rather than those from `llvmgcc`, as it was originally done in `toolchain4`. - -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 the [Xcode 7.3.1 dmg](https://developer.apple.com/devcenter/download.action?path=/Developer_Tools/Xcode_7.3.1/Xcode_7.3.1.dmg). - -This file is several gigabytes in size, but only a single directory inside is needed: -``` -Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.11.sdk -``` - -Unfortunately, the usual Linux tools (7zip, hpmount, loopback mount) are incapable of -opening this file. To create a tarball suitable for Gitian input, there are two options: - -Using macOS, you can mount the DMG, and then create it with: -```shell -hdiutil attach Xcode_7.3.1.dmg -tar -C /Volumes/Xcode/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/ -czf MacOSX10.11.sdk.tar.gz MacOSX10.11.sdk -``` - -Alternatively, you can use 7zip and SleuthKit to extract the files one by one. The script -[`extract-osx-sdk.sh`](./../contrib/macdeploy/extract-osx-sdk.sh) automates this. First -ensure the DMG file is in the current directory, and then run the script. You may wish to -delete the `intermediate 5.hfs` file and `MacOSX10.11.sdk` (the directory) when you've -confirmed the extraction succeeded. - -```shell -apt-get install p7zip-full sleuthkit -contrib/macdeploy/extract-osx-sdk.sh -rm -rf 5.hfs MacOSX10.11.sdk -``` - -The Gitian descriptors build 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 Gitian's outputs. All interim tarballs are fully deterministic and may be freely -redistributed. - -`genisoimage` is used to create the initial DMG. It is not deterministic as-is, so it has been -patched. A system `genisoimage` will work fine, but it will not be deterministic because -the file-order will change between invocations. The patch can be seen here: [theuni/osx-cross-depends](https://raw.githubusercontent.com/theuni/osx-cross-depends/master/patches/cdrtools/genisoimage.diff). -No effort was made to fix this cleanly, so it likely leaks memory badly. But it's only used for -a single invocation, so that's no real concern. - -`genisoimage` cannot compress DMGs, so afterwards, the DMG tool from the -`libdmg-hfsplus` project is used to compress it. There are several bugs in this tool and its -maintainer has seemingly abandoned the project. It has been forked and is available -(with fixes) here: [theuni/libdmg-hfsplus](https://github.com/theuni/libdmg-hfsplus). - -The DMG tool has the ability to create DMGs from scratch as well, but this functionality is -broken. Only the compression feature is currently used. Ideally, the creation could be fixed -and `genisoimage` would no longer be necessary. - -Background images and other features can be added to DMG files by inserting a -`.DS_Store` before creation. This is generated by the script -`contrib/macdeploy/custom_dsstore.py`. - -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 Gitian to create an unsigned release. This outputs an unsigned DMG which - users may choose to bless and run. It also outputs an unsigned app structure in the form - of a tarball, which also contains all of the tools that have been previously (deterministically) - built in order to create a final DMG. -- 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](https://github.com/bitcoin-core/bitcoin-detached-sigs). -- Builders feed the unsigned app + detached signature back into Gitian. It uses the - pre-built tools to recombine the pieces into a deterministic DMG. - |