feat(native_comp): Add support for --with-nativecomp

See https://akrl.sdf.org/gccemacs.html for more info.

Formulas/gcc.rb

@@ -0,0 +1,155 @@
+# frozen_string_literal: true
+
+class Gcc < Formula
+  desc 'GNU compiler collection'
+  homepage 'https://gcc.gnu.org/'
+  url 'https://ftp.gnu.org/gnu/gcc/gcc-10.2.0/gcc-10.2.0.tar.xz'
+  mirror 'https://ftpmirror.gnu.org/gcc/gcc-10.2.0/gcc-10.2.0.tar.xz'
+  sha256 'b8dd4368bb9c7f0b98188317ee0254dd8cc99d1e3a18d0ff146c855fe16c1d8c'
+  license 'GPL-3.0'
+  head 'https://gcc.gnu.org/git/gcc.git'
+
+  bottle do
+    sha256 '8dbccea194c20b1037b7e8180986e98a8ee3e37eaac12c7d223c89be3deaac6a' => :catalina
+    sha256 '79d2293ce912dc46af961f30927b31eb06844292927be497015496f79ac41557' => :mojave
+    sha256 '5ed870a39571614dc5d83be26d73a4164911f4356b80d9345258a4c1dc3f1b70' => :high_sierra
+  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? do
+    reason 'The bottle needs the Xcode CLT to be installed.'
+    satisfy { MacOS::CLT.installed? }
+  end
+
+  depends_on 'gmp'
+  depends_on 'isl'
+  depends_on 'libmpc'
+  depends_on 'mpfr'
+
+  uses_from_macos 'zlib'
+
+  # GCC bootstraps itself, so it is OK to have an incompatible C++ stdlib
+  cxxstdlib_check :skip
+
+  def version_suffix
+    if build.head?
+      'HEAD'
+    else
+      version.to_s.slice(/\d+/)
+    end
+  end
+
+  def install
+    # GCC will suffer build errors if forced to use a particular linker.
+    ENV.delete 'LD'
+
+    # 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 jit]
+
+    osmajor = `uname -r`.split('.').first
+    pkgversion = "Homebrew GCC #{pkg_version} #{build.used_options * ' '}".strip
+
+    args = %W[
+      --build=x86_64-apple-darwin#{osmajor}
+      --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-system-zlib
+      --with-pkgversion=#{pkgversion}
+      --with-bugurl=https://github.com/Homebrew/homebrew-core/issues
+      --enable-host-shared
+    ]
+
+    # 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
+
+    # Avoid reference to sed shim
+    args << 'SED=/usr/bin/sed'
+
+    # 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}"
+
+    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'
+
+      bin.install_symlink bin / "gfortran-#{version_suffix}" => 'gfortran'
+    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_suffix}", '-o', 'hello-c', 'hello-c.c'
+    assert_equal "Hello, world!\n", `./hello-c`
+
+    (testpath / 'hello-cc.cc').write <<~EOS
+      #include <iostream>
+      int main()
+      {
+        std::cout << "Hello, world!" << std::endl;
+        return 0;
+      }
+    EOS
+    system "#{bin}/g++-#{version_suffix}", '-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", '-o', 'test', 'test.f90'
+    assert_equal "Done\n", `./test`
+  end
+end