32-bit executables on aarch64?

[Robert Clausecker]

Hi Mark,

This is news to me.  Excellent news!  I can't say how grateful I am
for having this pointed out by you.  Can now go ahead and throw out
my dedicated armv7 test machine which has caused me a lot of
head aches with world builds and all that.

Yours,
Robert Clausecker

Am Wed, Mar 31, 2021 at 11:05:45AM -0700 schrieb Mark Millard:
> 
> On 2021-Mar-31, at 10:46, Robert Clausecker <fuz at fuz.su> wrote:
> 
> > Hi Thomas,
> > 
> > Unfortunately, there is no support for running armv7 executables
> > on arm64, though it would technically be possible to implement.
> > I myself would really like to have this sort of thing but I lack
> > the knowledge to have it.  Perhaps someone feels adventurous
> > enough to look into implementing support for this sort of thing.
> 
> aarch64 FreeBSD supports having an armv7 world installed
> in a directory tree for use with chroot.
> 
> I've a separate reply to the original submittal showing
> a use of such.
> 
> aarch64 FreeBSD lacks lib32 for more direct execution
> of armv7 FreeBSD code without involving a chroot use (or
> qemu use or other such).
> 
> > For historical reasons, the i386 and amd64 ports of gcc and clang
> > have a largely shared code base and are essentially the same port.
> > So options -m32, -m64 can be used to switch between them.  The same
> > is not possible for armv7 and arm64 which are distinct ports with
> > little to no shared backend code.  Consider using -target armv7
> > instead.
> > 
> > Yours,
> > Robert Clausecker
> > 
> > Am Wed, Mar 31, 2021 at 12:55:59PM -0400 schrieb Thomas David Rivers:
> >> 
> >> I'm playing around with a (rather-old now) 13.0-pre-pre-pre release
> >> on Raspberry PI 4B.
> >> 
> >> I was naively thinking I could just use -m32 to create a 32-bit
> >> executable... but the LLVM there promptly told me it didn't recognize
> >> -m32.
> >> 
> >> I installed the gcc V9 port and it said the same thing.
> >> 
> >> This begged the question, is there no support of 32-bit ARM (armv7)
> >> executables in the aarch64 environment?
> > 
> 
> ===
> Mark Millard
> marklmi at yahoo.com
> ( dsl-only.net went
> away in early 2018-Mar)
> 

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