www.digitalmars.com         C & C++   DMDScript  

digitalmars.D.ldc - restrictions for compiler code

reply =?ISO-8859-1?Q?R=E9mi?= Thebault via digitalmars-d-ldc writes:
Hello all

I'd like to contribute D code to LDC, but I don't know what
restrictions apply in the compiler code.

 - is it allowed to link to Phobos?
 - is it allowed to link to Druntime?
 - is it allowed to link to external D libraries that meet the 2 above
restrictions?

Thanks
Rémi
Oct 09 2016
parent reply Johan Engelen <j j.nl> writes:
On Monday, 10 October 2016 at 05:43:35 UTC, Rémi Thebault wrote:

 Hello all

 I'd like to contribute D code to LDC,


Great! Welcome :-)


 but I don't know what restrictions apply in the compiler code.

  - is it allowed to link to Phobos?
  - is it allowed to link to Druntime?


Both yes. For example:
https://github.com/ldc-developers/ldc/blob/master/driver/ir2obj_cache_pruning.d#L23-L24

However, I think you should only use functionality that is 
well-established and stable, so that chances are small that 
things will break in the future.
Also note that because LDC "LTS", the last LDC version that is 
not written with D code,  ships with Phobos v2.068.2, so that's 
the newest functionality that you can use.
https://github.com/ldc-developers/ldc/releases/tag/v0.17.0


  - is it allowed to link to external D libraries that meet the 
 2 above
 restrictions?


I am against using external libraries, because it complicates the 
build considerably. For example, we currently have libconfig as 
an external dependency and I would much like to get rid of it.

Anything specific you are thinking of contributing to LDC?

cheers,
   Johan
Oct 10 2016
parent reply Johan Engelen <j j.nl> writes:
On Monday, 10 October 2016 at 09:52:37 UTC, Johan Engelen wrote:

 
 For example, we currently have libconfig as an external 
 dependency and I would much like to get rid of it.


Is this written by you perhaps?
https://github.com/rtbo/libconfig-d

:D
Oct 10 2016
parent =?ISO-8859-1?Q?R=E9mi?= Thebault via digitalmars-d-ldc writes:
Le lundi 10 octobre 2016 à 10:11 +0000, Johan Engelen via digitalmars-
d-ldc a écrit :

 Is this written by you perhaps?
 https://github.com/rtbo/libconfig-d
 
 :D


Yes indeed!
I still need to check if it builds with phobos v2.068.2. (and may be
downgrade the code if needed)

libconfig-d depends on Pegged for parser generation. Pegged is really
great, but we need to keep the build process transparent, and I want to
be the least invasive possible.

Options:
 - rewrite a dedicated parser (should not be too difficult)
 - add Pegged as a submodule along with libconfig-d in a new 3rdparty
folder (or directly under driver/)
 - prepare a specific libconfig-ldc repo that also contains necessary
code from Pegged. (not great for maintainance)

In all cases I'll need to add a submodule somewhere.

regards,
Rémi
Oct 10 2016