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electrum/contrib/osx/README.md

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Building Mac OS binaries
========================
This guide explains how to build Electrum binaries for macOS systems.
## 1. Building the binary
This needs to be done on a system running macOS or OS X. We use El Capitan (10.11.6) as building it
on High Sierra (or later)
makes the binaries incompatible with older versions.
#### 1.1 Get Xcode
Building the QR code reader (CalinsQRReader) requires full Xcode (not just command line tools).
The last Xcode version compatible with El Capitan is Xcode 8.2.1
Get it from [here](https://developer.apple.com/download/more/).
Unfortunately, you need an "Apple ID" account.
After downloading, uncompress it.
Make sure it is the "selected" xcode (e.g.):
sudo xcode-select -s $HOME/Downloads/Xcode.app/Contents/Developer/
#### 1.2 Build Electrum
cd electrum
./contrib/osx/make_osx
This creates both a folder named Electrum.app and the .dmg file.
## 2. Building the image deterministically (WIP)
The usual way to distribute macOS applications is to use image files containing the
application. Although these images can be created on a Mac with the built-in `hdiutil`,
they are not deterministic.
Instead, we use the toolchain that Bitcoin uses: genisoimage and libdmg-hfsplus.
These tools do not work on macOS, so you need a separate Linux machine (or VM).
Copy the Electrum.app directory over and install the dependencies, e.g.:
apt install libcap-dev cmake make gcc faketime
Then you can just invoke `package.sh` with the path to the app:
cd electrum
./contrib/osx/package.sh ~/Electrum.app/