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1 files changed, 113 insertions, 0 deletions

diff --git a/rakelib/gcc.rake b/rakelib/gcc.rake
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+# This Source Code Form is subject to the terms of the Mozilla Public License,
+# v. 2.0. If a copy of the MPL was not distributed with this file, You can
+# obtain one at https://mozilla.org/MPL/2.0/. -}
+# frozen_string_literal: true
+
+require 'uri'
+require 'net/http'
+require 'open3'
+require 'pathname'
+
+def gcc_verbose(gcc_binary)
+  read, write = IO.pipe
+  sh({'LANG' => 'C'}, gcc_binary, '--verbose', err: write)
+  write.close
+  output = read.read
+  read.close
+  output
+end
+
+def find_build_target
+  gcc_verbose(ENV.fetch 'CC', 'gcc')
+    .lines
+    .find { |line| line.start_with? 'Target: ' }
+    .split(' ')
+    .last
+    .strip
+end
+
+def download_and_pipe(url, target, command)
+  target.mkpath
+
+  Net::HTTP.start(url.host, url.port, use_ssl: url.scheme == 'https') do |http|
+    request = Net::HTTP::Get.new url.request_uri
+
+    http.request request do |response|
+      case response
+      when Net::HTTPRedirection
+        download_and_pipe URI.parse(response['location']), target, command
+      when Net::HTTPSuccess
+        Dir.chdir target.to_path do
+          Open3.popen2(*command) do |stdin, stdout, wait_thread|
+            Thread.new do
+              stdout.each { |line| puts line }
+            end
+
+            response.read_body do |chunk|
+              stdin.write chunk
+            end
+            stdin.close
+
+            wait_thread.value
+          end
+        end
+      else
+        response.error!
+      end
+    end
+  end
+end
+
+namespace :gcc do
+  # Dependencies.
+  GCC_VERSION = "15.2.0"
+  HOST_GCC = 'build/host/gcc'
+  HOST_INSTALL = 'build/host/install'
+  GCC_PATCH = 'https://raw.githubusercontent.com/Homebrew/formula-patches/575ffcaed6d3112916fed77d271dd3799a7255c4/gcc/gcc-15.1.0.diff'
+
+  directory HOST_GCC
+  directory HOST_INSTALL
+  directory 'build/tools'
+
+  desc 'Download and configure the bootstrap compiler'
+  task configure: ['build/tools', HOST_GCC, HOST_INSTALL] do
+    url = URI.parse "https://gcc.gnu.org/pub/gcc/releases/gcc-#{GCC_VERSION}/gcc-#{GCC_VERSION}.tar.xz"
+    build_target = find_build_target
+    source_directory = Pathname.new "build/tools/gcc-#{GCC_VERSION}"
+    frontend_link = source_directory + 'gcc'
+
+    download_and_pipe url, source_directory.dirname, ['tar', '-Jxv']
+    download_and_pipe URI.parse(GCC_PATCH), source_directory, ['patch', '-p1']
+
+    sh 'contrib/download_prerequisites', chdir: source_directory.to_path
+    File.symlink Pathname.new('.').relative_path_from(frontend_link), (frontend_link + 'elna')
+
+    configure_options = [
+      "--prefix=#{File.realpath HOST_INSTALL}",
+      '--enable-languages=c,c++,elna',
+      '--disable-bootstrap',
+      '--disable-multilib',
+      '--with-system-zlib',
+      "--target=#{build_target}",
+      "--build=#{build_target}",
+      "--host=#{build_target}"
+    ]
+    if File.symlink? '/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk'
+      configure_options << '--with-sysroot=/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk'
+    end
+    env = ENV.slice 'CC', 'CXX'
+    env['CFLAGS'] = env['CXXFLAGS'] = '-O0 -g -fPIC -I/opt/homebrew/opt/flex/include'
+
+    configure = source_directory.relative_path_from(HOST_GCC) + 'configure'
+    sh env, configure.to_path, *configure_options, chdir: HOST_GCC
+  end
+
+  desc 'Make and install the bootstrap compiler'
+  task :make do
+    sh 'make', '-j', Etc.nprocessors.to_s, chdir: HOST_GCC
+    sh 'make', 'install', chdir: HOST_GCC
+  end
+end
+
+desc 'Build the bootstrap compiler'
+task gcc: %w[gcc:configure gcc:make]