Provide instructions for cross-compiling compiler-rt

[whitequark]

I came up with this platform config, based on clang_macho_embedded. Place it into make/platform/thumbv7m.mk and then run make thumbv7m.

[whitequark]

Actually, is compiler-rt even required anymore?

[farcaller]

Nice to see you around, @whitequark.

Yes, we still need compiler-rt in some way, as now we link to libgcc which is suboptimal. It's making the build system even more complex though (and pushing us further from cargo compatibility).

Ideally, this and cross-compiling of libcore should be extracted to somewhere, I think.

[whitequark]

Oooh, cargo is planned? Neat.

[bharrisau]

@farcaller I've got cargo packages for libcore and librlibc. I was stuck
working with compiler-rt when other life things came up.

On 7 December 2014 at 16:53, Peter Zotov notifications@github.com wrote:

Oooh, cargo is planned? Neat.

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