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# Copyright © 2012-2016 David Caldwell <>
# This launcher code is from and is not part of Emacs
# proper. It exists so that there can be a single download that contains
# binaries for all supported Mac OS X versions.
# Why not just use a fat binary? Because fat binaries can only hold 1 of
# each architecture and Emacs has multiple x86_64 architectures binaries.
# Why are there multiple x86_64 binaries? Because the Emacs source does OS
# feature detection at compile time instead of at run-time. So if you build
# Emacs on 10.9 then it will contain hard-coded calls to 10.9 APIs and will
# not run on 10.6. If you compile it on 10.6, then it will also run on 10.9,
# but it won't take advantage of any of the features in 10.9.
# Bug reports for this launcher should go here:
# Licence:
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# GNU General Public License for more details.
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <>.
require 'rubygems'
def osascript(script)
system 'osascript', *script.split(/\n/).map { |line| ['-e', line] }.flatten
version =`sw_vers -productVersion`)
arch=`uname -m`.chomp
# Support direct symlinks to
exe = $0
while (File.symlink? exe) do; exe = File.readlink exe; end
emacs = Dir["#{File.dirname(exe)}/Emacs-*"].map { |file| file.match(/^.*-(.+)-(.+)$/) && {:arch=>$1, :_version=>$2, :version=>$2.gsub('_','.')), :exe=>file} } \
.select { |v| v[:arch] == arch && v[:version] <= version } \
.sort { |a,b| a[:version] <=> b[:version] } \
# This dedups environment variables. Mac OS X 10.10 (Yosemite) always gives
# us 2 PATHs(!!) See:
# Ruby is written such that the last key wins, which is what we want since
# the first PATH is always the boring PATH=/usr/bin:/bin:/usr/sbin:/sbin
eh={}; ENV.each {|k,v| eh[k]=v} # Should be eh=ENV.to_h, but ENV in Ruby 1.8.7 doesn't have to_h.
if emacs
# sticks{bin,libexec} on the end of the PATH when it starts, so if we
# stick our own architecture dependent paths on the end of the PATH then they will override Emacs's paths
# while not affecting any user paths.
arch_version = emacs[:arch] + '-' + emacs[:_version] # see the 'combine-and-package' script in the build-emacs repo
ENV['PATH'] += ':' + File.join(base_dir, "bin-#{arch_version}") +
':' + File.join(base_dir, "libexec-#{arch_version}")
exec [emacs[:exe], emacs[:exe]], *ARGV
osascript <<-ENDSCRIPT
tell application "Finder"
display dialog "This application will not run on your computer. Sorry!"
end tell