[llvm-dev] Extending llvm-objcopy to support COFF

[Eric Christopher via llvm-dev]

Hi Zach!

I've been thinking a bit about this for a while now and I'm still of two
opinions:

On Wed, Mar 7, 2018 at 9:21 AM Zachary Turner via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> Currently llvm-objcopy only supports ELF files, and most of it's command
> line flags are ELF / DWARF specific that don't make any sense on COFF
> files.  So a useful set of options for COFF would be largely disjoint, with
> maybe 1-2 overlapping options.  What would be the best way to add this in
> llvm-objcopy?  I can think of 3 options:
>
> 1) Re-write the existing CLI of llvm-objcopy to use subcommands, and put
> the current set of options behind an ELF subcommand.  To me this is the
> cleanest approach, but it's also the most disruptive, as existing users of
> llvm-objcopy would have to retrain themselves to use this new subcommand,
> and tools / scripts may have to be updated as wells.
>
>
I really like this option. I like orderly commands and having an ELF
subcommand is really nice, however...


> 2) Throw in all of the COFF options to the current llvm-objcopy, and just
> have them be mixed with the ELF options.  I think this makes the tool more
> difficult to use and more confusing, but it is admittedly the simplest
> approach.
>
>
This is the sort of thing that people expect from using gnu objcopy and so
I'm reticent to have a tool with no way to get the "command line expected
syntax".

Mostly what I want is 1 with a shim that gets me 2.

Thoughts?

-eric


> 3) Make a new tool called llvm-coffcopy / llvm-objcopy-coff, or something
> to that effect.
>
> Anyone have any thoughts or strong preferences?
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