diff --git a/Formula/gcc@5.rb b/Formula/gcc@5.rb
new file mode 100644
index 00000000000..7eee4b33ac3
--- /dev/null
+++ b/Formula/gcc@5.rb
@@ -0,0 +1,203 @@
+class GccAT5 < Formula
+  def arch
+    if Hardware::CPU.type == :intel
+      if MacOS.prefer_64_bit?
+        "x86_64"
+      else
+        "i686"
+      end
+    elsif Hardware::CPU.type == :ppc
+      if MacOS.prefer_64_bit?
+        "powerpc64"
+      else
+        "powerpc"
+      end
+    end
+  end
+
+  def osmajor
+    `uname -r`.chomp
+  end
+
+  desc "The GNU Compiler Collection"
+  homepage "https://gcc.gnu.org"
+  url "https://ftpmirror.gnu.org/gcc/gcc-5.4.0/gcc-5.4.0.tar.bz2"
+  mirror "https://ftp.gnu.org/gnu/gcc/gcc-5.4.0/gcc-5.4.0.tar.bz2"
+  sha256 "608df76dec2d34de6558249d8af4cbee21eceddbcb580d666f7a5a583ca3303a"
+
+  # GCC's Go compiler is not currently supported on Mac OS X.
+  # See: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=46986
+  option "with-java", "Build the gcj compiler"
+  option "with-all-languages", "Enable all compilers and languages, except Ada"
+  option "with-nls", "Build with native language support (localization)"
+  option "with-profiled-build", "Make use of profile guided optimization when bootstrapping GCC"
+  option "with-jit", "Build the jit compiler"
+  option "without-fortran", "Build without the gfortran compiler"
+  # enabling multilib on a host that can"t run 64-bit results in build failures
+  option "without-multilib", "Build without multilib support" if MacOS.prefer_64_bit?
+
+  depends_on "gmp"
+  depends_on "libmpc"
+  depends_on "mpfr"
+  depends_on "isl@0.14"
+  depends_on "ecj" if build.with?("java") || build.with?("all-languages")
+
+  if MacOS.version < :leopard
+    # The as that comes with Tiger isn't capable of dealing with the
+    # PPC asm that comes in libitm
+    depends_on "cctools" => :build
+  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.
+  def pour_bottle?
+    MacOS::CLT.installed?
+  end
+
+  # GCC bootstraps itself, so it is OK to have an incompatible C++ stdlib
+  cxxstdlib_check :skip
+
+  # Fix for libgccjit.so linkage on Darwin.
+  # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64089
+  patch :DATA
+
+  def install
+    # GCC will suffer build errors if forced to use a particular linker.
+    ENV.delete "LD"
+
+    if MacOS.version < :leopard
+      ENV["AS"] = ENV["AS_FOR_TARGET"] = "#{Formula["cctools"].bin}/as"
+    end
+
+    if build.with? "all-languages"
+      # Everything but Ada, which requires a pre-existing GCC Ada compiler
+      # (gnat) to bootstrap. GCC 4.6.0 add go as a language option, but it is
+      # currently only compilable on Linux.
+      languages = %w[c c++ fortran java objc obj-c++ jit]
+    else
+      # C, C++, ObjC compilers are always built
+      languages = %w[c c++ objc obj-c++]
+
+      languages << "fortran" if build.with? "fortran"
+      languages << "java" if build.with? "java"
+      languages << "jit" if build.with? "jit"
+    end
+
+    version_suffix = version.to_s.slice(/\d/)
+
+    # 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"
+
+    args = [
+      "--build=#{arch}-apple-darwin#{osmajor}",
+      "--prefix=#{prefix}",
+      "--libdir=#{lib}/gcc/#{version_suffix}",
+      "--enable-languages=#{languages.join(",")}",
+      # Make most executables versioned to avoid conflicts.
+      "--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@0.14"].opt_prefix}",
+      "--with-system-zlib",
+      "--enable-libstdcxx-time=yes",
+      "--enable-stage1-checking",
+      "--enable-checking=release",
+      "--enable-lto",
+      # A no-op unless --HEAD is built because in head warnings will
+      # raise errors. But still a good idea to include.
+      "--disable-werror",
+      "--with-pkgversion=Homebrew GCC #{pkg_version} #{build.used_options*" "}".strip,
+      "--with-bugurl=https://github.com/Homebrew/homebrew-core/issues",
+    ]
+
+    # "Building GCC with plugin support requires a host that supports
+    # -fPIC, -shared, -ldl and -rdynamic."
+    args << "--enable-plugin" if MacOS.version > :tiger
+
+    # Otherwise make fails during comparison at stage 3
+    # See: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45248
+    args << "--with-dwarf2" if MacOS.version < :leopard
+
+    args << "--disable-nls" if build.without? "nls"
+
+    if build.with?("java") || build.with?("all-languages")
+      args << "--with-ecj-jar=#{Formula["ecj"].opt_share}/java/ecj.jar"
+    end
+
+    if !MacOS.prefer_64_bit? || build.without?("multilib")
+      args << "--disable-multilib"
+    else
+      args << "--enable-multilib"
+    end
+
+    args << "--enable-host-shared" if build.with?("jit") || build.with?("all-languages")
+
+    # Ensure correct install names when linking against libgcc_s;
+    # see discussion in https://github.com/Homebrew/homebrew/pull/34303
+    inreplace "libgcc/config/t-slibgcc-darwin", "@shlib_slibdir@", "#{HOMEBREW_PREFIX}/lib/gcc/#{version_suffix}"
+
+    mkdir "build" do
+      unless MacOS::CLT.installed?
+        # For Xcode-only systems, we need to tell the sysroot path.
+        # "native-system-headers" will be appended
+        args << "--with-native-system-header-dir=/usr/include"
+        args << "--with-sysroot=#{MacOS.sdk_path}"
+      end
+
+      system "../configure", *args
+
+      if build.with? "profiled-build"
+        # Takes longer to build, may bug out. Provided for those who want to
+        # optimise all the way to 11.
+        system "make", "profiledbootstrap"
+      else
+        system "make", "bootstrap"
+      end
+
+      # At this point `make check` could be invoked to run the testsuite. The
+      # deja-gnu and autogen formulae must be installed in order to do this.
+      system "make", "install"
+    end
+
+    # Handle conflicts between GCC formulae.
+    # Rename man7.
+    Dir.glob(man7/"*.7") { |file| add_suffix file, version_suffix }
+  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.undent
+      #include <stdio.h>
+      int main()
+      {
+        puts("Hello, world!");
+        return 0;
+      }
+    EOS
+    system bin/"gcc-5", "-o", "hello-c", "hello-c.c"
+    assert_equal "Hello, world!\n", `./hello-c`
+  end
+end
+
+__END__
+--- a/gcc/jit/Make-lang.in	2015-02-03 17:19:58.000000000 +0000
++++ b/gcc/jit/Make-lang.in	2015-04-08 22:08:24.000000000 +0100
+@@ -85,8 +85,7 @@
+	     $(jit_OBJS) libbackend.a libcommon-target.a libcommon.a \
+	     $(CPPLIB) $(LIBDECNUMBER) $(LIBS) $(BACKENDLIBS) \
+	     $(EXTRA_GCC_OBJS) \
+-	     -Wl,--version-script=$(srcdir)/jit/libgccjit.map \
+-	     -Wl,-soname,$(LIBGCCJIT_SONAME)
++	     -Wl,-install_name,$(LIBGCCJIT_SONAME)
+
+ $(LIBGCCJIT_SONAME_SYMLINK): $(LIBGCCJIT_FILENAME)
+	ln -sf $(LIBGCCJIT_FILENAME) $(LIBGCCJIT_SONAME_SYMLINK)
diff --git a/formula_renames.json b/formula_renames.json
index fda9b1b8dc6..2b5592320cb 100644
--- a/formula_renames.json
+++ b/formula_renames.json
@@ -16,6 +16,7 @@
   "gcc47": "gcc@4.7",
   "gcc48": "gcc@4.8",
   "gcc49": "gcc@4.9",
+  "gcc5": "gcc@5",
   "geode": "apache-geode",
   "glfw3": "glfw",
   "gmp4": "gmp@4",