[Vm-dev] Stack and Cog v3 VMs for ARMv7?

[Eliot Miranda]

Hi Phil,

_,,,^..^,,,_ (phone)

> On Apr 30, 2016, at 1:27 PM, Phil (list) <pbpublist at gmail.com> wrote:
> 
> 
> I'm trying to build VMs inside an ARM qemu image running on Debian 8
> armhf for oscogvm #3686 and have a couple of questions/issues.
> 
> The first thing I ran into when building
> build.linux32ARM/squeak.stack.v3/build was that gcc is hard-coded to
> generate armv6 in the mvm script.  Is this because the intention is to
> ensure that the resulting build works on the original Raspberry Pi

Yes

> or
> are there known issues with other architectures?  I want (and for the
> particular ARM image I am building in, need) armv7.  When I change to
> -march=armv7-a the VM builds without errors.  But when I run it on my
> rpi2 the VM begins to startup (i.e. a window is created but never has a
> chance to redraw) and then segfaults with a Smalltalk stack trace.
> (this occurs both with a Cuis as well as Squeak 4.6 images)  Is this a
> known problem?

Yes.  Here's a part of a message from Ryan pointing out difficulties with the ARM build

"The build is broken on Linux ARMv7 (i.e., everyone but Raspbian). The build fails in the configure step because it includes "-march=armv6 -mfpu=vfp -mfloat-abi=hard" in the compiler flags. This is not a valid configuration for a gcc built to target ARMv7. Removing this from mvm fixes the build."

> The next item is that there are no build.linux32ARM/squeak.cog.v3/*
> build targets.  Is this a supported configuration?

AFAIA, no one's tested this, but I don't know if it won't.  You might try running it in the simulator before trying to compile it.

>  Thanks,
> Phil