[fpc-devel] AArch64 -> ARM cross compilation

[J. Gareth Moreton]

Thanks Sven, that worked a treat. Now I need 
to try to reproduce these crashes that are 
plaguing Arm.

Gareth aka. Kit

On Sat 14/11/20 16:07 , Sven Barth via fpc-
devel fpc-devel at lists.freepascal.org sent:
> Am 14.11.2020 um 15:12 schrieb J. Gareth 
Moreton via fpc-devel:
> 
> > Hi everyone,
> 
> >
> 
> > I need a little bit of assistance so I 
can stamp
> out these bugs for you.
> >
> 
> > As silly as this sounds, I've mislaid my 
Arm-32
> SD card so I have to develop on AArch64 
exclusively on the Raspberry Pi. 
> As a result I only have the AArch64 
implementation of FPC installed.  Is
> there a way to cross-
> > compile AArch64 to Arm, or better, 
install an
> Arm version of FPC alongside my AArch64 
version?  I gather it's not quite
> as simple as running i386 on x86_64.  
Admittedly my expertise with Linux is
> still lacking a bit,
> > especially when it comes to getting the 
right
> software installed.
> >
> 
> > Gareth aka. Kit
> 
> >
> 
> > P.S. Trying to run "make clean all
> CPU_TARGET=arm" doesn't seem to work 
properly - gcc returns errors
> (doesn't recognise "-m64") and CPU_TARGET 
seems to get reset back
> to aarch64.
> > P.P.S. If I find my Arm-32 SD card 
again, I'll
> probably switch back to that for the 
testing and debugging.
> 
> 
> You need to install arm-linux binutils 
(don't know what the package is 
> 
> called) and then you need to invoke make 
like this:
> 
> 
> 
> make all CPU_TARGET=arm 
BINUTILSPREFIX=arm-linux- FPMAKEOPT="-T
> 4" -j 4
> 
> 
> Note 1: don't use "clean" and "all" 
together with
> parallel compilation 
> (the "-j 4")
> 
> 
> 
> Note 2: your prefix might be different, 
e.g. arm-linux-gnueabi- or 
> 
> something like that. Best try to execute 
as/ld using tab completion in 
> 
> the shell.
> 
> 
> 
> In theory it should also be possible to 
run 32-bit ARM applications on 
> 
> AArch64 though I have not tested that yet.
> 
> 
> 
> Regards,
> 
> Sven
> 
> 
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