What is the state of D with Android/iOS

[Rishub Nagpal via Digitalmars-d]

On Tuesday, 24 February 2015 at 19:34:15 UTC, Joakim wrote:
> On Tuesday, 24 February 2015 at 17:55:59 UTC, Rishub Nagpal 
> wrote:
>> On Tuesday, 24 February 2015 at 17:15:28 UTC, Joakim wrote:
>>> If you simply want to call a D library within an Android/iOS 
>>> app, that's possible, though there are still some rough edges.
>>> Specifically, there is still some work to be done with 
>>> certain floating-point operations on iOS 
>>> (http://forum.dlang.org/post/m2mw4tab0w.fsf@comcast.net) and 
>>> while Android/x86 will work fine 
>>> (http://wiki.dlang.org/Build_DMD_for_Android), Android/ARM 
>>> doesn't currently support TLS.  That lack of TLS support 
>>> means you'd have to run a slightly patched druntime and I'm 
>>> fairly certain phobos wouldn't work.
>>
>>
>> Could any of these patches be used as a basis to remedy it?
>>
>> https://groups.google.com/forum/#!topic/0xlab-devel/aSOcm3c9PFk
>> https://bugs.kde.org/show_bug.cgi?id=302709
>>
>> Could you in theory recompile Android to support TLS and then 
>> try to compile an executable for Android/ARM ?
>
> Sorry, the way I wrote that may have been confusing: I meant 
> that ldc doesn't currently support any form of TLS for 
> Android/ARM.
>
> Native TLS is not supported on Android/bionic for any 
> architecture, whether x86 or ARM.  I worked around this on x86 
> by removing the SHF_TLS and STT_TLS flags from the ELF objects 
> and using pthread_setspecific/pthread_getspecific instead (more 
> details on the dmd PR: 
> https://github.com/D-Programming-Language/dmd/pull/3643), which 
> is basically how Walter implemented TLS on OS X/Mach-O years 
> ago, as OS X didn't support native TLS till 10.7 and their TLV 
> APIs are still undocumented.
>
> I need to patch llvm in a similar way to that dmd PR, so that 
> Android/ARM can use the same scheme.  It appears that Dan did 
> something similar with his patched llvm for iOS.
>
> As for your linked Android patches, that might be possible but 
> would be pointless unless you are only deploying to a device 
> you patched the OS for.  Better to patch llvm to support the 
> same TLS scheme used for Android/x86.

Interesting. A few others and I were talking about getting
Android/ARM to function with LDC today. I'll be sure to keep up
to date with your work!