[swift-dev] R_ARM_GOT_PREL error when building Swift on Pi from source

[William Dillon]

What LLVM are you using?

You have to use the one from my github (and the arm branch) or it won't work:

https://github.com/hpux735/swift-llvm/tree/arm 

I haven't had time to upstream the changes to LLVM.

- Will

> On Apr 16, 2016, at 1:49 PM, Michael Gottesman via swift-dev <swift-dev at swift.org> wrote:
> 
> +CC Lang Hames (Just in case)
>> On Apr 15, 2016, at 6:45 PM, Joe Groff via swift-dev <swift-dev at swift.org <mailto:swift-dev at swift.org>> wrote:
>> 
>>> 
>>> On Apr 15, 2016, at 1:24 PM, Timothy Wood via swift-dev <swift-dev at swift.org <mailto:swift-dev at swift.org>> wrote:
>>> 
>>> 
>>> I was able to get Swift running on my Raspberry Pi using a variant of the instructions at <http://dev.iachieved.it/iachievedit/open-source-swift-on-raspberry-pi-2/ <http://dev.iachieved.it/iachievedit/open-source-swift-on-raspberry-pi-2/>> but sadly the packages I’ve found haven’t been updated for Swift 2.2 (so things like `associatedtype` don’t work nicely between Mac and Linux).
>>> 
>>> So, I thought I’d try building from source again hoping that the previous failure was resolved. But I’m still hitting the unimplemented relocation issue in LLVM’s RuntimeDyldELF.cpp, in RuntimeDyldELF::resolveARMRelocation(), where the relocation type that is being requested is R_ARM_GOT_PREL.
>>> 
>>> I thought I read in my last go-round on this that this was a regression in LLVM, but I’m not finding a pointer to this now, so maybe I’m misremembering.
>>> 
>>> Is there a trick to avoiding this issue in LLVM, or an existing patch somewhere that I can cherry-pick?
>> 
>> What linker are you using? GNU ld 2.26 in particular changed the behavior of protected visibility in a way that's incompatible with our usage, and we haven't fully implemented a workaround. You might try using gold or an older binutils, if that's what you're currently using.
>> 
>> -Joe
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