[swift-dev] [SR-40] Port Swift to Arm progress / question

[Joe Groff]

> On Dec 9, 2015, at 10:05 AM, Nick Wellnhofer via swift-dev <swift-dev at swift.org> wrote:
> 
> On 09/12/2015 18:55, Nick Wellnhofer via swift-dev wrote:
>>> Is there a better way to get that symbol, and why wasn’t this a problem for
>>> x86_64?
>> 
>> AFAICS, this is a problem for x86_64 Linux. It's not a problem on Apple
>> platforms, because there C++ binaries are linked with compiler-rt instead of
>> the GCC runtime.
> 
> Ah, you probably meant why __mulodi4 isn't a problem on x86_64 Linux. I think that's because it's defined by the 64-bit GCC runtime. (clang on Linux uses the GCC runtime AFAIK.)

Right, libgcc doesn't provide 128-bit integer entry points on 32-bit platforms, and doesn't provide the overflow-checking variant __muloti4 at all AFAIK.

-Joe