[llvm-dev] Extending llvm-objcopy to support Mach-O

Eric Christopher via llvm-dev
Tue, 02 Oct 2018 17:21:13 -0000

I'd give some consideration to moving the objcopy support itself into a
library inside llvm (possibly lib/Object as that makes the most sense) and
then the tool is just a thin wrapper on top of it.

-eric

On Mon, Oct 1, 2018 at 4:12 PM Alexander Shaposhnikov via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> Hey everyone! Objcopy is a powerful tool that allows one to modify object
> files in various manners, for example, modify symbols / symbol tables or
> copy / remove particular parts of a binary. It also serves as a basis for
> the strip tool.
> Currently, llvm-objcopy only supports ELF files while binutils' objcopy
> can handle Mach-O files as well. Besides extending the existing tool to
> support Mach-O binaries this would enable us to build LLVM-based
> replacements for cctools' install_name_tool (for changing rpath(s),
> identification name etc) and lipo / libtool (for manipulating
"fat"
> binaries) similarly to how llvm-strip was implemented on top of
> llvm-objcopy. Regarding the code organization, probably, in this case we
> will have separate folders: ELF, MachO and maybe a few top-level files
> (ObjcopyOpts.td, StripOpts.td). Any thoughts, concerns, or strong
> preferences ? Kind regards, Alex
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