www.digitalmars.com         C & C++   DMDScript  

digitalmars.D.ldc - Cross build for RPi2(3)

reply Oleg B <code.viator gmail.com> writes:
Hi, how I can build my project for RPi2 or 3 (armv7, armv8)?

By default ldc2-1.3.0-beta1 has no arm targets.

LDC - the LLVM D compiler (1.3.0-beta1):
   based on DMD v2.073.2 and LLVM 4.0.0
   built with LDC - the LLVM D compiler (1.3.0-beta1)
   Default target: x86_64-unknown-linux-gnu
   Host CPU: skylake
   http://dlang.org - http://wiki.dlang.org/LDC

   Registered Targets:
     x86    - 32-bit X86: Pentium-Pro and above
     x86-64 - 64-bit X86: EM64T and AMD64

Where I can get prebuilded ldc2 with arm target or ldc2 for host 
arm?
And if I found ldc2 with arm target how to build for it's target?
I need gcc and libs for arm, right?
Jun 07 2017
parent reply Joakim <dlang joakim.fea.st> writes:
On Wednesday, 7 June 2017 at 18:20:11 UTC, Oleg B wrote:

 Hi, how I can build my project for RPi2 or 3 (armv7, armv8)?


You could build on the device itself, using the native ARM 
compiler here:

https://github.com/ldc-developers/ldc/releases/tag/v1.1.0


 By default ldc2-1.3.0-beta1 has no arm targets.

 LDC - the LLVM D compiler (1.3.0-beta1):
   based on DMD v2.073.2 and LLVM 4.0.0
   built with LDC - the LLVM D compiler (1.3.0-beta1)
   Default target: x86_64-unknown-linux-gnu
   Host CPU: skylake
   http://dlang.org - http://wiki.dlang.org/LDC

   Registered Targets:
     x86    - 32-bit X86: Pentium-Pro and above
     x86-64 - 64-bit X86: EM64T and AMD64

 Where I can get prebuilded ldc2 with arm target or ldc2 for 
 host arm?


You'd have to build the former yourself, the latter is linked 
above.


 And if I found ldc2 with arm target how to build for it's 
 target?


Depends how it's configured and packaged, but supplying the right 
llvm triple is usually what it takes.  See how it's done for 
Android (llvm triple not needed because llvm is built with it 
above):

https://wiki.dlang.org/Build_LDC_for_Android#Build_a_command-line_executable


 I need gcc and libs for arm, right?


Yes, you need those, depending on what you're trying to do.
Jun 07 2017
parent reply Oleg B <code.viator gmail.com> writes:
Thank you, Joakim!

You know why is still no out-of-box solution? Why patches of ldc, 
phobos and druntime needed for android/arm compilation?
Jun 07 2017
parent Joakim <dlang joakim.fea.st> writes:
On Wednesday, 7 June 2017 at 21:52:50 UTC, Oleg B wrote:

 Thank you, Joakim!

 You know why is still no out-of-box solution? Why patches of 
 ldc, phobos and druntime needed for android/arm compilation?


ldc doesn't require any patching, it just patches the CMake 
config for druntime and phobos that comes in the ldc repo.  As 
for the rest, still some small tweaks that need to be upstreamed, 
detailed here:

https://github.com/joakim-noah/android/releases

It is pretty easy to build an ldc cross-compiler from source, but 
it still requires a little patching, going to submit a pull for 
that soon.  However, that's just from source, making it possible 
to cross-compile a stdlib using the pre-built compiler is another 
challenge.
Jun 07 2017