Fail to set LD_LIBRARY_PATH then cross build for ARM

[Joakim via digitalmars-d-ldc]

On Wednesday, 2 August 2017 at 00:46:01 UTC, Oleg B wrote:
> On Tuesday, 1 August 2017 at 20:18:43 UTC, Joakim wrote:
>> It is not clear what you're trying to do. You want to use the 
>> ldc 1.3 compiler on linux/x64 to cross-compile to linux/armhf?
>
> Yes.
>
>> To do this, you are building the ldc 1.4 libraries natively on 
>> linux/armhf, then copying them over to linux/x64 and trying to 
>> use them with ldc 1.3?
>
> Yes, I build master ldc some time ago (before 1.3.0 release) 
> and it have version 1.4.0 (it's not master now, I say master 
> because it was not a tag and I don't know why developers names 
> it 1.4.0) and it's very long time building. Now I only try 
> using builded libs. If they did not work, I must be rebuild 
> they. But they work! And working druntime and phobos isn't a 
> question.
>
>> If you have a working ldc 1.4 on your Raspberry/ARM board, why
>> not just use that?
>
> Because rpi2 have 1GB RAM, building gtk-d need more 1.6 GB RAM.
> For code without gtk-d building is very slow.
>
>> Please detail exactly what you're doing, as you seem to be 
>> trying something unusual.
>
> I try build my soft on rpi.
>
> Main question is how to specify dir with ARM version of 
> druntime and phobos and remove default dir from call extern gcc 
> compiler? Default dir is /usr/lib64 and it contains druntime 
> and phobos (x86_64). Additional dir not scans because build 
> fails while trying loading existing x86_64 libs.

OK, got it, would have helped a lot if you'd explained all this 
from the beginning.  I'm guessing you're using ldc 1.3 installed 
by your distro's package manager, as I don't see any lib64 in the 
ldc download, so your distro packages a ldc2.conf that adds the 
lib64 path.  You can make sure by looking at /usr/etc/ldc2.conf, 
or wherever your distro puts that config file, and looking for 
lib64 in there.

You're probably best off creating a .ldc/ldc2.conf in your home 
directory, with the specific config you want for linux/armhf.  
See this previous post for an example:

http://forum.dlang.org/post/skdqeursuheqdsermmwh@forum.dlang.org

We're working on making it much simpler to cross-compile the 
stdlib for the next ldc 1.4 beta, see kinke's latest patch here:

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

I'm not sure how well your approach will work, as the ldc 1.4 
stdlib may not work with ldc 1.3.  I'll be submitting a PR soon 
that should make it even easier, so you may want to wait for the 
next 1.4 beta instead.