I would like to cross-compile C-family languages (C, C++, Objective-C, and Objective-C++) to the Raspberry Pi using Clang and LLVM on a build computer of a different architecture. How may I do this?
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If the idea is to build your own software from source code (as opposed to building well-known packages from source code and targeting the ARM processor), then checking out something like this will be useful.– WineSoakedAug 10, 2015 at 3:09
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2 Answers
Just completed my article, Cross compilation for Raspberry from Sierra, about exactly this thing. Under Mac OS Sierra though. But for clang it matters a little.
In this article I have shared experience (which costed me some days of suffering). Hope it will be useful. In short, all you have to do is to specify rootfs and target triple:
path/to/clang --target=arm-linux-gnueabihf --sysroot=/some/path/arm-linux-gnueabihf/sysroot my-happy-program.c -fuse-ld=lld
I added -fuse-ld=lld option, because otherwise clang will try to lookup legacy binutils.
I followed this article and it seems to work fine for trivial programs (console/string/math stuff, not many optimization flags). I used ver 1.19 of crosstool-ng on a x86-64 laptop running ZenWalk 7.0
There also seems to be this post over at SO, which might be helpful (haven't fully read thru it yet).
