os/mac: optionally use ruby_macho.

- and branch for dylib_id_and_dylibs
- add branches for dylib id changing and change_install_name
- rename MachO module to HomebrewMachO to prevent namespace clashes
  with MachO in ruby-macho. this will eventually be replaced entirely
  with direct calls to ruby-macho methods
- break ruby-macho implementation out into separate RubyMachO module,
  and include either RubyMachO or CctoolsMachO (the original
  implementation) based on the HOMEBREW_RUBY_MACHO env var
- move ArchitectureListExtension and RubyMachO into separate files
- create {ruby_,cctools_,,}relocate.rb for isolation of different
  methods of mach-o relocation (ruby-macho vs. cctools)
- fill in require_install_name_tool? for ruby_relocate.rb
- rename {ruby_,cctools_,,}relocate.rb to keg, isolate requires in
  os/mac

Closes Homebrew/homebrew#45001.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>

1 files changed, 19 insertions, 0 deletions

diff --git a/Library/Homebrew/os/mac/ruby_keg.rb b/Library/Homebrew/os/mac/ruby_keg.rb
new file mode 100644
index 000000000..f6fc33495
--- /dev/null
+++ b/Library/Homebrew/os/mac/ruby_keg.rb
@@ -0,0 +1,19 @@
+require "vendor/macho/macho"
+
+module RubyKeg
+  def change_dylib_id(id, file)
+    @require_install_name_tool = true
+    puts "Changing dylib ID of #{file}\n  from #{file.dylib_id}\n    to #{id}" if ARGV.debug?
+    MachO::Tools.change_dylib_id(file, id)
+  end
+
+  def change_install_name(old, new, file)
+    @require_install_name_tool = true
+    puts "Changing install name in #{file}\n  from #{old}\n    to #{new}" if ARGV.debug?
+    MachO::Tools.change_install_name(file, old, new)
+  end
+
+  def require_install_name_tool?
+    !!@require_install_name_tool
+  end
+end