x86_64-elf-grub 2.06 (new formula)

Add GNU GRUB bootloader cross-compiler for x86_64-elf target. This formula
builds GRUB bootloader components specifically for x86_64 architecture,
which is essential for OS development and bootloader customization.

Signed-off-by: Polina Simonenko <[email protected]>

Formula/x/x86_64-elf-grub.rb

@@ -0,0 +1,76 @@
+class X8664ElfGrub < Formula
+  desc "GNU GRUB bootloader for x86_64-elf"
+  homepage "https://savannah.gnu.org/projects/grub"
+  url "https://ftp.gnu.org/gnu/grub/grub-2.06.tar.xz"
+  mirror "https://mirrors.ocf.berkeley.edu/gnu/grub/grub-2.06.tar.xz"
+  sha256 "b79ea44af91b93d17cd3fe80bdae6ed43770678a9a5ae192ccea803ebb657ee1"
+  license "GPL-3.0-or-later"
+
+  depends_on "help2man" => :build
+  depends_on "objconv" => :build
+  depends_on "texinfo" => :build
+  depends_on "x86_64-elf-binutils" => :build
+  depends_on "x86_64-elf-gcc" => [:build, :test]
+  depends_on "freetype"
+  depends_on "gettext"
+  depends_on "mtools"
+  depends_on "xorriso"
+  depends_on "xz"
+  uses_from_macos "bison" => :build
+  uses_from_macos "flex" => :build
+  uses_from_macos "python" => :build
+
+  resource "unifont" do
+    url "https://ftp.gnu.org/gnu/unifont/unifont-16.0.02/unifont-16.0.02.pcf.gz", using: :nounzip
+    mirror "https://mirrors.ocf.berkeley.edu/gnu/unifont/unifont-16.0.02/unifont-16.0.02.pcf.gz"
+    sha256 "02a3fe11994d3cdaf1d4bd5d2b6b609735e6823e01764ae83b704e02ec2f640d"
+  end
+
+  def install
+    target = "x86_64-elf"
+    ENV["CFLAGS"] = "-Os -Wno-error=incompatible-pointer-types"
+
+    resource("unifont").stage do
+      cp "unifont-16.0.02.pcf.gz", buildpath/"unifont.pcf.gz"
+    end
+    ENV["UNIFONT"] = buildpath/"unifont.pcf.gz"
+
+    mkdir "build" do
+      args = %W[
+        --disable-werror
+        --enable-grub-mkfont
+        --target=#{target}
+        --prefix=#{prefix}/#{target}
+        --bindir=#{bin}
+        --libdir=#{lib}/#{target}
+        --with-platform=efi
+        --program-prefix=#{target}-
+      ]
+
+      system "../configure", *args
+      system "make"
+      system "make", "install"
+
+      mkdir_p "#{prefix}/#{target}/share/grub"
+
+      system "./grub-mkfont",
+        "--output=#{prefix}/#{target}/share/grub/unicode.pf2",
+        ENV["UNIFONT"].to_s
+    end
+  end
+
+  test do
+    target = "x86_64-elf"
+    (testpath/"boot.c").write <<~C
+      __asm__(
+        ".align 4\\n"
+        ".long 0x1BADB002\\n"
+        ".long 0x0\\n"
+        ".long -(0x1BADB002 + 0x0)\\n"
+      );
+    C
+    system Formula["#{target}-gcc"].bin/"#{target}-gcc", "-c", "-o", "boot", "boot.c"
+    assert_match "0",
+      shell_output("#{bin}/#{target}-grub-file --is-x86-multiboot boot; echo -n $?")
+  end
+end

audit_exceptions/mismatched_binary_allowlist.json

@@ -6,5 +6,6 @@
   "i686-elf-grub": "lib/i686-elf/grub/i386-pc/*",
   "lima": "share/lima/lima-guestagent.Linux-*",
   "picotool": "share/picotool/xip_ram_perms.elf",
-  "qemu": "share/qemu/*"
+  "qemu": "share/qemu/*",
+  "x86_64-elf-grub": "lib/x86_64-elf/grub/i386-pc/*"
 }