[fpc-pascal] How to build for arm6 in RaspberryPi on arm7?

[Bo Berglund]

On Wed, 09 Sep 2020 00:03:29 +0200, Bo Berglund via fpc-pascal
<fpc-pascal at lists.freepascal.org> wrote:

>No, it is on an RPi4 so it is ArmV7.
In fact I have been told on the RPi forum RPi4 is Armv8
Armv6: Pi0, PiB, PiA+
Armv7: Pi2Bv1.1
Armv8: Pi2Bv1.2, Pi3, Pi4

But they could not advice how to use a newer RPi (higher numbered arm)
to build an application that could run on earlier arm versions such as
on the RPiZero.
They referred back here.


Anyway I used the Fpc/Lazarus installation I had done on the PiZero
and opened the test project as checked out from svn.
It could be built on the RPiZero and when I ran it (started from a
terminal rather than from Lazarus) it worked as it should.

So:
If I install Fpc and Lazarus from sources as I always do and specify
ArmV6 in the process on the RPiZero, then it will make an application
that works fine there.

And when I transfer it to the RPi4 (using scp) it works fine also
there...

Question:
Can I make a parallel installation of FPC and Lazarus on my RPi4 which
is using the Armv6 settings during the make and thus get a system that
will produce compatible programs?

Or do I have to scrap the existing installation altogether and then
reinstall using Armv6 setrtings?


-- 
Bo Berglund
Developer in Sweden