[cfe-dev] Using lld in ELLCC for different targets

[Rui Ueyama via cfe-dev]

On Fri, Oct 28, 2016 at 2:56 PM, Richard Pennington via cfe-dev <
cfe-dev at lists.llvm.org> wrote:

> With all the talk about using lld on the list, I thought it would be
> interesting to try using it in my clang based ELLCC cross compilation tool
> chain. http://ellcc.org
>
> The change was simple, since I use configuration files to tell clang how
> to compile, where to find libraries, etc. I described the config files
> here: http://ellcc.org/blog/?p=13246
>
> All I had to do was change the linker executable definition for each
> target:
>
> linker:
>
>   #exe: $E/ecc-ld$X
>
>   exe: $E/ld.lld$x
>
> (where $E is the executable directory where the compiler was found and $X
> is the executable extension, "" under Linux)
>
> Here are the results of linking a program for Linux:
>
> ARM32 v6: Good
>
> ARM32 v7: Good
>
> ARM32 big endian: Not supported by lld, no armelfb_linux_eabi emulation
> mode.
>
> Aarch64: Good
>
> MIPS 32 little and big endian: Good
>
> MIPS64 big endian: Good
>
> PPC32: lld failed with a bad relocation type.
>
> PPC64 little endian: Not supported by lld, no elf64lppc emulation mode.
>
> X86 32 and 64: Good
>
> As a test I built clang to run native on ARMv6, ARMv7, Aarch64, MIPS32,
> MIPS64, and x86_84 Linux: Good
>
> Very cool!
>

Awesome results!

I wonder if ARM32 BE is a real thing. I know that the processor is
bi-endian, but is there any system that uses ARM32 in big-endian mode?


> I use ld for mingw-w64 targets. Is there a mode for the COFF lld that
> makes it also act like ld?
>

Unfortunately, no. You can use the GNU compatible driver on Windows, but it
always produces ELF.

Now I have to look into how lld supports Linker scripts for my non-Linux
> targets.
>
> -Rich
>
>
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