homebrew-core/Formula/gcc@8.rb

class GccAT8 < Formula
  desc "GNU compiler collection"
  homepage "https://gcc.gnu.org/"
  url "https://ftp.gnu.org/gnu/gcc/gcc-8.5.0/gcc-8.5.0.tar.xz"
  mirror "https://ftpmirror.gnu.org/gcc/gcc-8.5.0/gcc-8.5.0.tar.xz"
  sha256 "d308841a511bb830a6100397b0042db24ce11f642dab6ea6ee44842e5325ed50"

  livecheck do
    url :stable
    regex(%r{href=.*?gcc[._-]v?(8(?:\.\d+)+)(?:/?["' >]|\.t)}i)
  end

  bottle do
    sha256 big_sur:  "c23c342d120580e8fbd897712b6ddce67fb0f0235ca8745736f4c00d8b0f2bd5"
    sha256 catalina: "e031d1e8b3ac06f7fb3ae54e594254dcfdfd2e84e54b15ee370f570d4353db7c"
    sha256 mojave:   "5ddd8753dbd6a3a3841e3ef72f67608761e0ab574ca3218b4fed54f1399cc861"
  end

  # The bottles are built on systems with the CLT installed, and do not work
  # out of the box on Xcode-only systems due to an incorrect sysroot.
  pour_bottle? only_if: :clt_installed

  depends_on arch: :x86_64
  depends_on "gmp"
  depends_on "isl"
  depends_on "libmpc"
  depends_on "mpfr"

  uses_from_macos "zlib"

  on_linux do
    depends_on "binutils"
  end

  # GCC bootstraps itself, so it is OK to have an incompatible C++ stdlib
  cxxstdlib_check :skip

  def install
    # GCC will suffer build errors if forced to use a particular linker.
    ENV.delete "LD"

    version_suffix = version.major.to_s

    # Even when suffixes are appended, the info pages conflict when
    # install-info is run so pretend we have an outdated makeinfo
    # to prevent their build.
    ENV["gcc_cv_prog_makeinfo_modern"] = "no"

    # We avoiding building:
    #  - Ada, which requires a pre-existing GCC Ada compiler to bootstrap
    #  - Go, currently not supported on macOS
    #  - BRIG
    languages = %w[c c++ objc obj-c++ fortran]

    pkgversion = "Homebrew GCC #{pkg_version} #{build.used_options*" "}".strip

    args = %W[
      --prefix=#{prefix}
      --libdir=#{lib}/gcc/#{version_suffix}
      --disable-nls
      --enable-checking=release
      --enable-languages=#{languages.join(",")}
      --program-suffix=-#{version_suffix}
      --with-gmp=#{Formula["gmp"].opt_prefix}
      --with-mpfr=#{Formula["mpfr"].opt_prefix}
      --with-mpc=#{Formula["libmpc"].opt_prefix}
      --with-isl=#{Formula["isl"].opt_prefix}
      --with-pkgversion=#{pkgversion}
      --with-bugurl=#{tap.issues_url}
    ]

    on_macos do
      args << "--build=x86_64-apple-darwin#{OS.kernel_version.major}"
      args << "--with-system-zlib"

      # Xcode 10 dropped 32-bit support
      args << "--disable-multilib" if DevelopmentTools.clang_build_version >= 1000

      # System headers may not be in /usr/include
      sdk = MacOS.sdk_path_if_needed
      if sdk
        args << "--with-native-system-header-dir=/usr/include"
        args << "--with-sysroot=#{sdk}"
      end

      # Workaround for Xcode 12.5 bug on Intel
      # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100340
      args << "--without-build-config" if DevelopmentTools.clang_build_version >= 1205

      # Ensure correct install names when linking against libgcc_s;
      # see discussion in https://github.com/Homebrew/legacy-homebrew/pull/34303
      inreplace "libgcc/config/t-slibgcc-darwin", "@shlib_slibdir@", "#{HOMEBREW_PREFIX}/lib/gcc/#{version_suffix}"
    end

    on_linux do
      # Fix Linux error: gnu/stubs-32.h: No such file or directory.
      args << "--disable-multilib"
    end

    mkdir "build" do
      system "../configure", *args

      # Use -headerpad_max_install_names in the build,
      # otherwise updated load commands won't fit in the Mach-O header.
      # This is needed because `gcc` avoids the superenv shim.
      system "make", "BOOT_LDFLAGS=-Wl,-headerpad_max_install_names"
      system "make", "install"
    end

    # Handle conflicts between GCC formulae and avoid interfering
    # with system compilers.
    # Rename man7.
    Dir.glob(man7/"*.7") { |file| add_suffix file, version_suffix }
    # Even when we disable building info pages some are still installed.
    info.rmtree
  end

  def add_suffix(file, suffix)
    dir = File.dirname(file)
    ext = File.extname(file)
    base = File.basename(file, ext)
    File.rename file, "#{dir}/#{base}-#{suffix}#{ext}"
  end

  test do
    (testpath/"hello-c.c").write <<~EOS
      #include <stdio.h>
      int main()
      {
        puts("Hello, world!");
        return 0;
      }
    EOS
    system "#{bin}/gcc-#{version.major}", "-o", "hello-c", "hello-c.c"
    assert_equal "Hello, world!\n", `./hello-c`

    (testpath/"hello-cc.cc").write <<~EOS
      #include <iostream>
      struct exception { };
      int main()
      {
        std::cout << "Hello, world!" << std::endl;
        try { throw exception{}; }
          catch (exception) { }
          catch (...) { }
        return 0;
      }
    EOS
    system "#{bin}/g++-#{version.major}", "-o", "hello-cc", "hello-cc.cc"
    assert_equal "Hello, world!\n", `./hello-cc`

    (testpath/"test.f90").write <<~EOS
      integer,parameter::m=10000
      real::a(m), b(m)
      real::fact=0.5

      do concurrent (i=1:m)
        a(i) = a(i) + fact*b(i)
      end do
      write(*,"(A)") "Done"
      end
    EOS
    system "#{bin}/gfortran-#{version.major}", "-o", "test", "test.f90"
    assert_equal "Done\n", `./test`
  end
end