D for microservices

[Joakim]

On Sunday, 11 March 2018 at 11:10:09 UTC, Tamas wrote:
> On Thursday, 8 March 2018 at 22:53:11 UTC, aberba wrote:
>> On Thursday, 8 March 2018 at 09:35:08 UTC, Andrew Benton wrote:
>>> On Thursday, 8 March 2018 at 07:54:29 UTC, Jacob Carlborg 
>>> wrote:
>>>> On Thursday, 8 March 2018 at 07:20:53 UTC, Radu wrote:
>>>>
>>>>> This guys says that vide.d works 
>>>>> https://forum.dlang.org/thread/gikoeutmdyvolfshpqqq@forum.dlang.org
>>>>
>>>> Yes, it's pretty straightforward:
>>>>
>>>> 1. Build on Ubuntu, or some other dist
>>>> 2. Statically link the whole binary with LDC, then you don't 
>>>> need to use Musl
>>>> 3. Run it on Alpine
>>>>
>>>> --
>>>> /Jacob Carlborg
>>>
>>> Looks like that works out much nicer than using alpine as the 
>>> first stage right now.  I'm not sure anyone will be too upset 
>>> about the extra 7MB.
>>
>> Building directly in alpine will simplify automated builds too.
>
> Simple Vibe.d app talking to Redis, packed into docker 
> containers:
> https://github.com/tam4s/hello-redis
>
> The takeaway is that I could not use Alpine as a host image, 
> because I could not build the app statically on ubuntu.
>
> warning: Using 'dlopen' in statically linked applications 
> requires at runtime the shared libraries from the glibc version 
> used for linking

I've put up a new binary release of ldc 1.9 for Alpine, which 
fixes the vibe.d issues by pulling in two upstream commits from 
druntime, adds druntime and Phobos as shared libraries, and 
includes dub and rdmd:

https://github.com/ldc-developers/ldc/releases

I tested by unpacking that release in an Alpine VPS, adding its 
bin/ to my path, and simply running the following:

dub fetch vibe-d
dub build vibe-d

The list of Alpine packages needed to run ldc are listed in the 
release notes. You can also cross-compile using the regular linux 
build of ldc by using ldc-build-runtime, the included tool to 
rebuild the stdlib for other platforms, and these instructions 
from the wiki:

https://wiki.dlang.org/Building_LDC_runtime_libraries#Usage_for_cross-compilation

I'm looking at adding a flag to dmd to enable building for the 
Musl C runtime:

https://github.com/dlang/dmd/pull/8020

While the Musl port is mostly there, it appears that yshui didn't 
bother porting all of druntime, so there may still be other dub 
packages that need other missing C declarations. However, I'm 
done working on this port, beyond finishing off the above pull 
and the druntime pull linked from the release notes, as I don't 
use Alpine, containers, or microservices. I simply chipped in 
because I have porting experience and thought I could push D for 
microservices a bit farther along. I'll keep putting out official 
builds of ldc for Alpine though, as long as there's demand for 
them.

If you'd like to use D in Alpine containers, now's the time to 
contribute to whatever else is missing.  A good idea of the 
current status can be found in the first post of the dmd pull 
linked above.

This may be a good project for the hackathon, as it's mostly 
polishing up a bunch of small things.