require 'formula'

class SnowLeopardOrOlder < Requirement
  fatal true
  def satisfied?
    MacOS.version <= :snow_leopard
  end

  def message; <<-EOS.undent
    This version of ld64 will only build on 10.6 and older.
    It is provided for older versions of OS X.
    EOS
  end
end

class Ld64 < Formula
  homepage 'http://opensource.apple.com/'
  # Latest is 134.9, but it no longer supports building for PPC.
  # 127.2 won't build on Tiger, at least without some patching.
  # Leopard users: if you like, add a 127.2 option or fix the build
  # on Tiger.
  #
  url 'http://opensource.apple.com/tarballs/ld64/ld64-97.17.tar.gz'
  sha1 '7c1d816c2fec02e558f4a528d16d8161f0e379b5'

  depends_on SnowLeopardOrOlder

  # Tiger either includes old versions of these headers,
  # or doesn't ship them at all
  depends_on 'cctools-headers' => :build
  depends_on 'dyld-headers' => :build
  depends_on 'libunwind-headers' => :build

  keg_only :provided_by_osx,
    "ld64 is an updated version of the ld shipped by Apple."

  fails_with :gcc_4_0 do
    build 5370
  end

  def patches
    {
      :p0 => [
        # Fixes logic on PPC branch islands
        "https://trac.macports.org/export/103948/trunk/dports/devel/ld64/files/ld64-97-ppc-branch-island.patch",
        # Remove LTO support
        "https://trac.macports.org/export/103949/trunk/dports/devel/ld64/files/ld64-97-no-LTO.patch",
        # Fix version number
        "https://trac.macports.org/export/103951/trunk/dports/devel/ld64/files/ld64-version.patch"
      ]
    }
  end

  def install
    File.open('Makefile', 'w') {|f| f.write DATA.read}
    inreplace 'src/ld/Options.cpp', '@@VERSION@@', version

    if MacOS.version < :leopard
      # No CommonCrypto
      inreplace 'src/ld/MachOWriterExecutable.hpp' do |s|
        s.gsub! '<CommonCrypto/CommonDigest.h>', '<openssl/md5.h>'
        s.gsub! 'CC_MD5', 'MD5'
      end

      inreplace 'Makefile', "-Wl,-exported_symbol,__mh_execute_header", ""
    end

    args = %W[
      CC=#{ENV.cc}
      CXX=#{ENV.cxx}
      OTHER_CPPFLAGS=#{ENV.cppflags}
      OTHER_LDFLAGS=#{ENV.ldflags}
    ]

    args << 'RC_SUPPORTED_ARCHS="armv6 armv7 i386 x86_64"' if MacOS.version >= :lion
    args << "OTHER_LDFLAGS_LD64=-lcrypto" if MacOS.version < :leopard

    # Macports makefile hardcodes optimization
    inreplace 'Makefile' do |s|
      s.change_make_var! 'CFLAGS', ENV.cflags
      s.change_make_var! 'CXXFLAGS', ENV.cxxflags
    end

    system "make", *args
    system "make", "install", "PREFIX=#{prefix}"
  end
end

# makefile courtesy Macports:
# https://trac.macports.org/browser/trunk/dports/devel/ld64/files/Makefile-97
__END__
ifdef LLVM_CONFIG
LLVM_CPPFLAGS := -I$(shell $(LLVM_CONFIG) --includedir) -DLTO_SUPPORT
LLVM_LDFLAGS := -L$(shell $(LLVM_CONFIG) --libdir) -lLTO
endif

CPPFLAGS = $(LLVM_CPPFLAGS) -Isrc/abstraction -Isrc/ld $(OTHER_CPPFLAGS)
CFLAGS = -Os $(OTHER_CFLAGS)
CXXFLAGS = -Os $(OTHER_CXXFLAGS)
LDFLAGS = $(OTHER_LDFLAGS)

ifndef RANLIB
RANLIB = ranlib
endif
ifndef AR
AR = ar
endif
ifndef PREFIX
PREFIX = /usr
endif

all : src/ld/configure.h ObjectDump dyldinfo ld machocheck rebase unwinddump libprunetrie.a

src/ld/configure.h :
	touch $@

ObjectDump : src/ld/debugline.o
ObjectDump : src/other/ObjectDump.o 
	$(CXX) $(LLVM_LDFLAGS) $(LDFLAGS) $^ -o $@

dyldinfo : src/other/dyldinfo.o
	$(CXX) $(LDFLAGS) -Wl,-exported_symbol,__mh_execute_header $^ -o $@

ld : src/ld/debugline.o
ld : src/ld/ld.o
ld : src/ld/Options.o
	$(CXX) $(LLVM_LDFLAGS) $(LDFLAGS) $(OTHER_LDFLAGS_LD64) -Wl,-exported_symbol,__mh_execute_header $^ -o $@

machocheck : src/other/machochecker.o
	$(CXX) $(LDFLAGS) $^ -o $@

rebase : src/other/rebase.o
	$(CXX) $(LDFLAGS) -Wl,-exported_symbol,__mh_execute_header $^ -o $@

unwinddump : src/other/unwinddump.o
	$(CXX) $(LDFLAGS) -Wl,-exported_symbol,__mh_execute_header $^ -o $@

libprunetrie.a : src/other/PruneTrie.o
	$(AR) cru $@ $^
	$(RANLIB) $@

install : all
	install -d -m 755 $(DESTDIR)$(PREFIX)/bin
	install -d -m 755 $(DESTDIR)$(PREFIX)/lib
	install -d -m 755 $(DESTDIR)$(PREFIX)/include/mach-o
	install -d -m 755 $(DESTDIR)$(PREFIX)/share/man/man1
	
	install -m 755 ObjectDump $(DESTDIR)$(PREFIX)/bin
	install -m 755 dyldinfo   $(DESTDIR)$(PREFIX)/bin
	install -m 755 ld         $(DESTDIR)$(PREFIX)/bin
	install -m 755 machocheck $(DESTDIR)$(PREFIX)/bin
	install -m 755 rebase     $(DESTDIR)$(PREFIX)/bin
	install -m 755 unwinddump $(DESTDIR)$(PREFIX)/bin

	install -m 644 src/other/prune_trie.h $(DESTDIR)$(PREFIX)/include/mach-o
	install -m 644 libprunetrie.a $(DESTDIR)$(PREFIX)/lib

	install -m 644 doc/man/man1/dyldinfo.1   $(DESTDIR)$(PREFIX)/share/man/man1
	install -m 644 doc/man/man1/ld.1         $(DESTDIR)$(PREFIX)/share/man/man1
	install -m 644 doc/man/man1/ld64.1       $(DESTDIR)$(PREFIX)/share/man/man1
	install -m 644 doc/man/man1/rebase.1     $(DESTDIR)$(PREFIX)/share/man/man1
	install -m 644 doc/man/man1/unwinddump.1 $(DESTDIR)$(PREFIX)/share/man/man1