[Lazarus] Unable to cross-compile Lazarus applications in Linux from x86_64 to arm target (Raspberry pi 3)

[Giuliano Colla]

Hi all,

I'm trying to set up my Lazarus in a Linux x86_64 platform to cross 
compile for an ARMV7 target (Raspberry pi 3), but I'm unable to make it 
work.

The environment is CentOs 6, Linux x86_64, fpc 2.6.4. Both Lazarus 1.4.4 
and Lazarus 1.7 (from trunk) give identical results. The target should 
be arm-linux.

I believe that my custom fpc.cfg is properly set, because I can 
cross-compile a simple console app:
> fpc -Tlinux -Parm -XParm-linux- TestArm.pas
works just fine and generates an arm object file and an arm executable, 
which runs on the target.

But up to now, any attempt to cross-compile on Lazarus has failed.

I assume that I should set Target OS = Linux, Target CPU family = arm, 
Target processor = ARMV7

But with those parameters the compilation aborts immediately with 
"Illegal parameter -CpARMV7"

If I set Target processor = Default, I must add a lot of extra paths to 
make it find the sources (why?), but finally it compiles everything, and 
properly puts the generated .o and .ppu files in the arm-linux 
directories. But the generated .o files are of type ELF x86-64, and then 
ld aborts, telling (correctly) that it supports only the arm formats.

With this setup the compiler options are:
>
> -Tlinux -Parm -MObjFPC -Scghi -O1 -g -gl -l -vewnhibq -Filib/arm-linux 
> -Fi/usr/lib64/lazarus/lcl/include 
> -Fu../fpc/2.6.4/packages/fcl-process/src 
> -Fu/usr/lib64/lazarus/components/lazutils -Fu/usr/lib64/lazarus/lcl 
> -Fu/usr/lib64/lazarus/lcl/widgetset 
> -Fu/usr/lib64/lazarus/lcl/interfaces/gtk2 
> -Fu../lazarus/lcl/units/arm-linux/gtk2 
> -Fu../lazarus/lcl/units/arm-linux 
> -Fu../lazarus/components/lazutils/lib/arm-linux 
> -Fu../lazarus/packager/units/arm-linux -Fu. -FUlib/arm-linux -dLCL 
> -dLCLgtk2 -XParm-linux-
>

What I'm doing wrong? What I'm missing?

Any help is greatly appreciated.

Thanks in advance,

Giuliano


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