In trying to improve compatibility for a SwiftUI app (XcodesOrg/XcodesApp#121), I found the steps necessary to compile for Apple's new M1 chips and created a new Makefile to target this architecture.

This is far from ideal as it would be great if a "universal" binary was the result, but I'm not so familiar with this ecosystem to figure out how to do this, or if it's possible.

Much of this was adapted from the steps outlined in #1537.

I've written out the steps I found success and included it in the top of makerelease-macOS-m1.mk:

In order to use this Makefile to build for Apple silicon, first install Xcode Command Line Tools:

$ xcode-select --install

Then install dependencies with Homebrew:

$ brew install automake
$ brew install autoconf
$ brew install libtool
$ brew install pkg-config
$ brew install docutils
$ brew install libxml2

Setup environment variables:

$ export PATH=${PATH}:/usr/local/opt/gettext/bin
$ export PKG_CONFIG_PATH="/usr/local/opt/libxml2/lib/pkgconfig"
$ export LDFLAGS="-L/usr/local/opt/libxml2/lib"
$ export CPPFLAGS="-I/usr/local/opt/libxml2/include"

Configure (differs from what's on the README to import pkg-config macros):

$ autoreconf -i -I /opt/homebrew/share/aclocal/

To use this Makefile, do something along the lines of

$ mkdir build-release
$ cd build-release
$ virtualenv .
$ . bin/activate
$ pip install sphinx-build
$ ln -s ../makerelease-os.mk Makefile
$ make