[email protected] 2.17 (new formula)

This is part of the effort to bring Portable Ruby (and perhaps Homebrew)
to AArch64 Linux.

2.17 is the first glibc version that supports AArch64 [1]. As discussed
previously [2], this formula will allow us to later build Portable Ruby
against this version of glibc for maximum coverage of Linux
distributions on AArch64.

[1]: https://sourceware.org/glibc/wiki/Release/2.17
[2]: Homebrew/homebrew-portable-ruby#212

Formula/g/glibc@2.17.rb

@@ -0,0 +1,190 @@
+require "os/linux/glibc"
+
+class GlibcBaseRequirement < Requirement
+  def message
+    tool = self.class::TOOL
+    version = self.class::VERSION
+    <<~EOS
+      #{[tool, version].compact.join(" ")} is required to build glibc.
+      Install #{tool} with your host package manager if you have sudo access:
+        sudo apt-get install #{tool}
+        sudo yum install #{tool}
+    EOS
+  end
+
+  def display_s
+    "#{self.class::TOOL} #{self.class::VERSION}".strip
+  end
+end
+
+class GawkRequirement < GlibcBaseRequirement
+  fatal true
+  satisfy(build_env: false) { which(TOOL).present? }
+  TOOL = "gawk".freeze
+  VERSION = "3.1.2 (or later)".freeze
+end
+
+class MakeRequirement < GlibcBaseRequirement
+  fatal true
+  satisfy(build_env: false) { which(TOOL).present? }
+  TOOL = "make".freeze
+  VERSION = "3.79 (or later)".freeze
+end
+
+class SedRequirement < GlibcBaseRequirement
+  fatal true
+  satisfy(build_env: false) { which(TOOL).present? }
+  TOOL = "sed".freeze
+  VERSION = "3.02 (or later)".freeze
+end
+
+class LinuxKernelRequirement < Requirement
+  fatal true
+
+  MINIMUM_LINUX_KERNEL_VERSION = "2.6.16".freeze
+
+  satisfy(build_env: false) do
+    OS.kernel_version >= MINIMUM_LINUX_KERNEL_VERSION
+  end
+
+  def message
+    <<~EOS
+      Linux kernel version #{MINIMUM_LINUX_KERNEL_VERSION} or later is required by glibc.
+      Your system has Linux kernel version #{OS.kernel_version}.
+    EOS
+  end
+
+  def display_s
+    "Linux kernel #{MINIMUM_LINUX_KERNEL_VERSION} (or later)"
+  end
+end
+
+class GlibcAT217 < Formula
+  desc "GNU C Library"
+  homepage "https://www.gnu.org/software/libc/"
+  url "https://ftp.gnu.org/gnu/glibc/glibc-2.17.tar.gz"
+  mirror "https://ftpmirror.gnu.org/gnu/glibc/glibc-2.17.tar.gz"
+  sha256 "a3b2086d5414e602b4b3d5a8792213feb3be664ffc1efe783a829818d3fca37a"
+  license all_of: ["GPL-2.0-or-later", "LGPL-2.1-or-later"]
+
+  keg_only :versioned_formula
+
+  depends_on GawkRequirement => :build
+  depends_on "[email protected]" => :build
+  depends_on MakeRequirement => :build
+  depends_on SedRequirement => :build
+  depends_on :linux
+  depends_on LinuxKernelRequirement
+
+  # Backport of:
+  # https://sourceware.org/git/?p=glibc.git;a=commit;h=e9177fba13549a8e2a6232f46080e5c6d3e467b1
+  patch do
+    url "https://git.centos.org/rpms/glibc/raw/ca483cc5b0e3e6a595a2c103755dee4d72f14f25/f/SOURCES/glibc-rh1500908.patch"
+    sha256 "48bfb15f5a26161bbef3d58e18d44876a170ddbfcc5922a39c77fd8da9fe68f6"
+  end
+
+  # Backport of:
+  # https://sourceware.org/git/?p=glibc.git;a=commit;h=43d06ed218fc8be58987bdfd00e21e5720f0b862
+  patch do
+    url "https://raw.githubusercontent.com/Homebrew/formula-patches/edf27e2c185b2914a864c66d8fcdca966d73b407/glibc/2.17-aarch64-dl-machine.diff"
+    sha256 "ece66819f9ef3a1b73081d0f5cda8c814b5204d25c07f8a7adb8209ee286c39d"
+  end
+
+  def install
+    # Fix checking version of gnumake... 4.3, bad
+    inreplace "configure",
+              "3.79* | 3.[89]*)",
+              "3.79* | 3.[89]* | [4-9].* | [1-9][0-9]*)"
+
+    # Fix checking version of gcc-11... 11.4.0, bad
+    inreplace "configure",
+              "4.[3-9].* | 4.[1-9][0-9].* | [5-9].* )",
+              "4.[3-9].* | 4.[1-9][0-9].* | [5-9].* | [1-9][0-9]* )"
+
+    # Setting RPATH breaks glibc.
+    %w[
+      LDFLAGS LD_LIBRARY_PATH LD_RUN_PATH LIBRARY_PATH
+      HOMEBREW_DYNAMIC_LINKER HOMEBREW_LIBRARY_PATHS HOMEBREW_RPATH_PATHS
+    ].each { |x| ENV.delete x }
+
+    # Fix relocation R_X86_64_32S against symbol `__libc_csu_fini' can not be
+    # used when making a PIE object; recompile with -fPIE
+    # See https://sourceware.org/pipermail/libc-alpha/2020-March/111688.html
+    ENV.append "LDFLAGS", "-no-pie" if Hardware::CPU.intel?
+
+    # Use brewed ld.so.preload rather than the host's /etc/ld.so.preload
+    inreplace "elf/rtld.c",
+              '= "/etc/ld.so.preload";',
+              '= SYSCONFDIR "/ld.so.preload";'
+
+    mkdir "build" do
+      args = [
+        "--disable-debug",
+        "--disable-dependency-tracking",
+        "--disable-silent-rules",
+        "--prefix=#{prefix}",
+        "--sysconfdir=#{etc}",
+        "--enable-obsolete-rpc",
+        "--without-gd",
+        "--without-selinux",
+        "--with-headers=#{Formula["[email protected]"].include}",
+      ]
+      system "../configure", *args
+      system "make", "all"
+      system "make", "install"
+      prefix.install_symlink "lib" => "lib64"
+    end
+
+    # Fix quoting of filenames that contain @
+    inreplace [lib/"libc.so", lib/"libpthread.so"],
+              %r{(#{Regexp.escape(prefix)}/\S*) },
+              '"\1" '
+
+    # Remove executables/dylibs that link with system libnsl
+    [
+      sbin/"nscd",
+      lib/"libnss_nisplus-#{version}.so",
+      lib/"libnss_compat-#{version}.so",
+      lib/"libnss_nis-#{version}.so",
+    ].each(&:unlink)
+  end
+
+  def post_install
+    # Compile locale definition files
+    mkdir_p lib/"locale"
+
+    # Get all extra installed locales from the system, except C locales
+    locales = ENV.filter_map do |k, v|
+      v if k[/^LANG$|^LC_/] && v != "C" && !v.start_with?("C.")
+    end
+
+    # en_US.UTF-8 is required by gawk make check
+    locales = (locales + ["en_US.UTF-8"]).sort.uniq
+    ohai "Installing locale data for #{locales.join(" ")}"
+    locales.each do |locale|
+      lang, charmap = locale.split(".", 2)
+      if charmap.present?
+        charmap = "UTF-8" if charmap == "utf8"
+        system bin/"localedef", "-i", lang, "-f", charmap, locale
+      else
+        system bin/"localedef", "-i", lang, locale
+      end
+    end
+
+    # Set the local time zone
+    sys_localtime = Pathname("/etc/localtime")
+    brew_localtime = etc/"localtime"
+    etc.install_symlink sys_localtime if sys_localtime.exist? && !brew_localtime.exist?
+
+    # Set zoneinfo correctly using the system installed zoneinfo
+    sys_zoneinfo = Pathname("/usr/share/zoneinfo")
+    brew_zoneinfo = share/"zoneinfo"
+    share.install_symlink sys_zoneinfo if sys_zoneinfo.exist? && !brew_zoneinfo.exist?
+  end
+
+  test do
+    assert_match "Usage", shell_output("#{lib}/ld-#{version}.so 2>&1", 127)
+    safe_system lib/"libc.so.6", "--version"
+    safe_system bin/"locale", "--version"
+  end
+end