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digitalmars.D.ldc - LDC cross compilation wiki

reply Andre Pany <andre s-e-a-p.de> writes:
Hi,
While searching for LDC and cross compile, google shows as first 
hit https://wiki.dlang.org/LDC_cross-compilation_for_ARM_GNU/Linux
Which is perfect.

I just wonder whether the details are still valid:
Llvm 3.8.0
LDC 1.0
ARM patch needed?

Could someone with knowledge on this topic have a look?

Kind regards
André
Aug 07 2017
parent reply Joakim <dlang joakim.fea.st> writes:
On Monday, 7 August 2017 at 13:34:09 UTC, Andre Pany wrote:

 Hi,
 While searching for LDC and cross compile, google shows as 
 first hit 
 https://wiki.dlang.org/LDC_cross-compilation_for_ARM_GNU/Linux
 Which is perfect.

 I just wonder whether the details are still valid:
 Llvm 3.8.0
 LDC 1.0
 ARM patch needed?

 Could someone with knowledge on this topic have a look?


No, it's outdated and shouldn't be followed.  The next ldc 1.4 
beta will support cross-compiling the stdlib for arbitrary 
platforms, provided the requisite llvm CPU backend is included:

https://github.com/ldc-developers/ldc/pull/2253

I'm going to submit a PR so that all the flags there can be 
boiled down to two options, OS and arch, for platforms that we 
support.  You'll still be able to override anything with custom 
flags or configure it yourself for unsupported platforms.

We'll add some docs for all this on the wiki when it's done, and 
redirect this page to those new instructions.
Aug 07 2017
parent reply Andre Pany <andre s-e-a-p.de> writes:
On Monday, 7 August 2017 at 15:49:02 UTC, Joakim wrote:

 On Monday, 7 August 2017 at 13:34:09 UTC, Andre Pany wrote:

 Hi,
 While searching for LDC and cross compile, google shows as 
 first hit 
 https://wiki.dlang.org/LDC_cross-compilation_for_ARM_GNU/Linux
 Which is perfect.

 I just wonder whether the details are still valid:
 Llvm 3.8.0
 LDC 1.0
 ARM patch needed?

 Could someone with knowledge on this topic have a look?


 No, it's outdated and shouldn't be followed.  The next ldc 1.4 
 beta will support cross-compiling the stdlib for arbitrary 
 platforms, provided the requisite llvm CPU backend is included:

 https://github.com/ldc-developers/ldc/pull/2253

 I'm going to submit a PR so that all the flags there can be 
 boiled down to two options, OS and arch, for platforms that we 
 support.  You'll still be able to override anything with custom 
 flags or configure it yourself for unsupported platforms.

 We'll add some docs for all this on the wiki when it's done, 
 and redirect this page to those new instructions.


I would try to use the ldc-build-runtime tool to cross compile to 
my Raspberry Pi (From Windows). But by reading this wiki page 
"https://wiki.dlang.org/Building_LDC_runtime_libraries" it is not 
clear for me what to do.

What is already working: Executing this command seems to finish 
without error:
C:\D\ldc2-1.4.0-beta1-win32-msvc\bin>ldc-build-runtime 
--ldcSrcDir "ldc-1.4.0-beta1-src" --ninja

But I think I have to call this command with specific parameters 
for the Raspberry Pi. Where do I find this parameters?

Kind regards
André
Sep 09 2017
parent reply Joakim <dlang joakim.fea.st> writes:
On Saturday, 9 September 2017 at 12:16:58 UTC, Andre Pany wrote:

 On Monday, 7 August 2017 at 15:49:02 UTC, Joakim wrote:

 On Monday, 7 August 2017 at 13:34:09 UTC, Andre Pany wrote:

 Hi,
 While searching for LDC and cross compile, google shows as 
 first hit 
 https://wiki.dlang.org/LDC_cross-compilation_for_ARM_GNU/Linux
 Which is perfect.

 I just wonder whether the details are still valid:
 Llvm 3.8.0
 LDC 1.0
 ARM patch needed?

 Could someone with knowledge on this topic have a look?


 No, it's outdated and shouldn't be followed.  The next ldc 1.4 
 beta will support cross-compiling the stdlib for arbitrary 
 platforms, provided the requisite llvm CPU backend is included:

 https://github.com/ldc-developers/ldc/pull/2253

 I'm going to submit a PR so that all the flags there can be 
 boiled down to two options, OS and arch, for platforms that we 
 support.  You'll still be able to override anything with 
 custom flags or configure it yourself for unsupported 
 platforms.

 We'll add some docs for all this on the wiki when it's done, 
 and redirect this page to those new instructions.


 I would try to use the ldc-build-runtime tool to cross compile 
 to my Raspberry Pi (From Windows). But by reading this wiki 
 page "https://wiki.dlang.org/Building_LDC_runtime_libraries" it 
 is not clear for me what to do.

 What is already working: Executing this command seems to finish 
 without error:
 C:\D\ldc2-1.4.0-beta1-win32-msvc\bin>ldc-build-runtime 
 --ldcSrcDir "ldc-1.4.0-beta1-src" --ninja

 But I think I have to call this command with specific 
 parameters for the Raspberry Pi. Where do I find this 
 parameters?

 Kind regards
 André


There are tutorials like this that seem to have some info:

http://gnutoolchains.com/raspberry/tutorial/

I've never used the RPi so I don't know what toolchains are out 
there.  You need a C toolchain for the RPi, then you specify the 
C compiler using CC, and the flags they tell you to use for 
compiling and linking get passed to ldc-build-runtime.

Hopefully, we'll eventually have a preset configuration for some 
popular RPi toolchain, but someone will have to submit a pull for 
that once my pull to keep a bunch of preset configurations for 
common platforms is in:

https://github.com/ldc-developers/ldc/pull/2301
Sep 09 2017
next sibling parent Andre Pany <andre s-e-a-p.de> writes:
On Saturday, 9 September 2017 at 19:27:38 UTC, Joakim wrote:

 There are tutorials like this that seem to have some info:

 http://gnutoolchains.com/raspberry/tutorial/

 I've never used the RPi so I don't know what toolchains are out 
 there.  You need a C toolchain for the RPi, then you specify 
 the C compiler using CC, and the flags they tell you to use for 
 compiling and linking get passed to ldc-build-runtime.

 Hopefully, we'll eventually have a preset configuration for 
 some popular RPi toolchain, but someone will have to submit a 
 pull for that once my pull to keep a bunch of preset 
 configurations for common platforms is in:

 https://github.com/ldc-developers/ldc/pull/2301


Thanks, I am still trying to get it running but no success so far.

Visual Studio 14: There is a batch file "vcvarsall.bat" which can 
be called with parameter x86_arm. While executing 
ldc-build-runtime there is an error from Visual Studio that 
desktop app cannot be build for architecture ARM.

Next I tried GCC from your link. If I understand the error log 
correctly, CMake tries to create a windows executable using the 
cross compiler for linux/arm. I created an issue for this 
https://github.com/ldc-developers/ldc/issues/2322.

Kind regards
André
Sep 10 2017
prev sibling parent Andre Pany <andre s-e-a-p.de> writes:
On Saturday, 9 September 2017 at 19:27:38 UTC, Joakim wrote:

 On Saturday, 9 September 2017 at 12:16:58 UTC, Andre Pany wrote:

 [...]


 There are tutorials like this that seem to have some info:

 http://gnutoolchains.com/raspberry/tutorial/

 I've never used the RPi so I don't know what toolchains are out 
 there.  You need a C toolchain for the RPi, then you specify 
 the C compiler using CC, and the flags they tell you to use for 
 compiling and linking get passed to ldc-build-runtime.

 Hopefully, we'll eventually have a preset configuration for 
 some popular RPi toolchain, but someone will have to submit a 
 pull for that once my pull to keep a bunch of preset 
 configurations for common platforms is in:

 https://github.com/ldc-developers/ldc/pull/2301


With the toolchain mentioned by you and the help of kinke I got 
it working. Cross compiling from Windows to Raspberry Pi looks 
quite promising. I still waiting on the testrunner results, to 
validate wheter it is working 100%.

Kind regards
André
Sep 11 2017