Objcopy without EFI targets

PeterX · **Joined:** Fri Nov 22, 2019 5:46 am **Posts:** 590

The GNU-EFI readme writes:

Quote:

objcopy --help

Verify that the line "supported targets" contains the string
"efi-app-ia32" and "efi-app-x86_64" and that the "-j" option
accepts wildcards.

It names as an functioning example Objcopy 2.24.
But my version (Objcopy 2.35 on Manjaro Linux) doesn't support EFI targets nor -j wildcards.
Do I have to download and build Objcopy (or Binutils) from source now?

Greetings
Peter

linuxyne · **Joined:** Sat Jul 02, 2016 7:02 am **Posts:** 210

objcopy treats efi-app-ia32 as pei-i386, and efi-app-x86_64 as pei-x86-64. If the pei-* strings are listed as supported targets, that should work. Check convert_efi_target inside binutils.

You might know about [1] and [2].

[3] gives details about the 'inner workings'.

Does any part of the build or execution fail?

[1]: https://wiki.osdev.org/Talk:UEFI_Bare_Bones
[2]: https://wiki.osdev.org/GNU-EFI
[3]: https://github.com/vathpela/gnu-efi/blo ... nuefi#L153

Octocontrabass · **Joined:** Mon Mar 25, 2013 7:01 pm **Posts:** 5134

PeterX wrote:

GNU-EFI

There may be an easier way.

PeterX · **Joined:** Fri Nov 22, 2019 5:46 am **Posts:** 590

Octocontrabass wrote:

PeterX wrote:

GNU-EFI

There may be an easier way.

Wow thanks! I have to read that thoroughly, but a quick glance looks promising.

Greetings
Peter

moonchild · **Joined:** Wed Apr 01, 2020 4:59 pm **Posts:** 73

Clang is great, but I don't recommend using c-efi headers. They are buggy and incomplete. Shouldn't be be difficult to use gnu-efi headers anyway, though; just copy them in and add to your include path. (Gnu efi headers also match the spec more closely, which makes it easier to adapt examples.)

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Objcopy without EFI targets

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