class Libelf < Formula
  desc "ELF object file access library"
  homepage "http://www.mr511.de/software/"
  url "http://www.mr511.de/software/libelf-0.8.13.tar.gz"
  sha256 "591a9b4ec81c1f2042a97aa60564e0cb79d041c52faa7416acb38bc95bd2c76d"
  revision 1

  bottle do
    cellar :any_skip_relocation
    sha256 "7cb626407ee7d61546f2493da91ecc63996d6180949b96b84793e075bd130f2d" => :mojave
    sha256 "e11504a15c64cd7fca3248ca7ed14eead25a5d63d8bbd9a8e00f076c56602295" => :high_sierra
    sha256 "a771e35555810a4910304e3ca5967ea3e4f8cbe45576e5b2dc6b80cd9c1f0f13" => :sierra
    sha256 "a06b058c7e401942f442f573b63aa2cdd548b45d38b02b7af92393c67093f56e" => :el_capitan
    sha256 "3b4ea9ab20228d9e912f80a330b6d6d093f9bb65a712208c83cd49bdcc4fc9ea" => :yosemite
    sha256 "eded3b774d412e533f37bc6d5dc133859141653ce953a0d4cbf4a950dda633f6" => :mavericks
  end

  def install
    system "./configure", "--disable-debug",
                          "--disable-dependency-tracking",
                          "--prefix=#{prefix}",
                          "--disable-compat"
    # Use separate steps; there is a race in the Makefile.
    system "make"
    system "make", "install"
  end

  test do
    elf_content =  "7F454C460101010000000000000000000200030001000000548004083" \
      "4000000000000000000000034002000010000000000000001000000000000000080040" \
      "80080040874000000740000000500000000100000B00431DB43B96980040831D2B20CC" \
      "D8031C040CD8048656C6C6F20776F726C640A"
    File.open(testpath/"elf", "w+b") do |file|
      file.write([elf_content].pack("H*"))
    end

    (testpath/"test.c").write <<~EOS
      #include <gelf.h>
      #include <fcntl.h>
      #include <stdio.h>

      int main(void) {
        GElf_Ehdr ehdr;
        int fd = open("elf", O_RDONLY, 0);
        if (elf_version(EV_CURRENT) == EV_NONE) return 1;
        Elf *e = elf_begin(fd, ELF_C_READ, NULL);
        if (elf_kind(e) != ELF_K_ELF) return 1;
        if (gelf_getehdr(e, &ehdr) == NULL) return 1;
        printf("%d-bit ELF\\n", gelf_getclass(e) == ELFCLASS32 ? 32 : 64);
        return 0;
      }
    EOS

    system ENV.cc, "test.c", "-L#{lib}", "-I#{include}/libelf",
                   "-lelf", "-o", "test"
    assert_match "32-bit ELF", shell_output("./test")
  end
end