[LLVMdev] Quad-Core ARMv7 Build Slave Seeks Noble Purpose

[Sean Silva]

On Wed, Nov 13, 2013 at 10:31 PM, Nick Kledzik <kledzik at apple.com> wrote:

>
> On Nov 13, 2013, at 6:17 PM, Sean Silva <chisophugis at gmail.com> wrote:
>
> > What do you want me to build?  LLVM?  Clang?  Both plus test suite?
>>
>> Personally, I see more value in building LLVM, Clang, possibly lld,
>>
>
> I think LLD would especially benefit from testing on other architectures,
> since LLD is the most prone to accidentally having something
> architecture-dependent (e.g. assuming pointers are 64 bits, endianness,
> alignment, etc) and so testing it on more architectures will turn up bugs.
>
>
> Yes, lld reads binary files so gets all the potential bugs that comes with
> that.  Mach-O binary format is challenging because it uses bit fields
> structs and the compiler switches the direction of bit fields on big vs
> little endian archs!
>

Ouch...


>
> That said, isn’t the ARM machine 32-bit little endian?  Other than
> possible alignment issues, it has the same coverage as i386.   What lld
> needs is big endian build machines.
>

Yeah, big endian would really be nice (ppc, sparc? we must have *some*
big-endian builders...), but just the alignment checking is still a
worthwhile step up from the status quo I think (although IIRC UBSan also
catches these?).

-- Sean Silva


>
> -Nick
>
>
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