Re: Cross compiling user applications for armv7

[Sorry: I missed instructions for targeting main 16 [16.0-CURRENT] and
instructions for targeting 14.3-RELEASE. Which are you after?]

On Sep 14, 2025, at 06:44, Mark Millard <[email protected]> wrote:

> On Sep 14, 2025, at 05:46, Michał Kruszewski <[email protected]> wrote:
> 
>> I have finally managed
>> poudriere jail -c -x -j armv7 -m git+https -a arm.armv7 -v releng/14.3 -K GENERIC
>> to work.
>> I see that it cross compiles the systems.
>> This is pointless and redundant as I have already cross compiled the system on my own.
> 
> It does involve a reference to the source tree used. I
> do not know your your PATH_TO_ARMV7_SYS_DIR . I show
> deleting the above jail creation as well.

The below targets 16.0-CURRENT instead f 14.3-RELEASE.

> # poudriere jail -d -jarmv7
> # poudriere jail -c -jarmv7 -a arm.armv7 -m null -M PATH_TO_ARMV7_SYS_DIR -S /usr/src/ -v 16.0-CURRENT

-v 14.3-RELEASE would be in the alternative.

> That presumes that qemu-user-static is already installed
> and that the likes of:
> 
> # binmiscctl enable armv7
> 
> has already been done.
> 
> It sets up for references to the system toolchain to
> be natively executed for cross build activity. But
> it does not set up for any other toolchain references
> to be natively executed.
> 
> 
> One alternative to that based on official binary builds:
> 
> There is a way for poudriere to create its jail from official
> pre-built binaries and still have that property ( I show deleting
> the prior jail as well ):

The below targets 14.3-RELEASE instead of 16.0-CURRENT.

> # poudriere jail -d -jarmv7
> # poudriere jail -c -jarmv7 -aarmv7 -U https://pkg.freebsd.org -mpkgbase=base_release_3 -v 14

-mpkgbase=base_latest -v 16 would be in the alternative.

> That presumes that qemu-user-static is already installed
> and that the likes of:
> 
> # binmiscctl enable armv7
> 
> has already been done. It sets up for references to the
> system toolchain to be natively executed. But it does
> not set up for any other toolchain references to be
> natively executed.
> 
>> How can I tell poudriere to use the system I have compiled on my own?
> 
> See above.
> 
>> I also started wondering why is qemu even required?
> 
> A lot of the ports tree does not use the system
> toolchain at all, for example, instead using
> other port-tree packages that are alternate
> toolchain materials.
> 
> The ports-package based toolchains are not set
> up for doing cross builds and ports using
> alternative toolchains do not try to do
> cross-build instances of the alternate
> toolchains.
> 
>> The cross compiler toolchain is already prepared and ready-to-use after system compilation.
> 
> Not for the toolchains used by many ports.
> See above.
> 
>> The ports descriptions already exist.
>> Why can't I simply cross compile ports?
> 
> The infrastructure is set up to to use the
> system toolchain natively --but not to
> natively use any other toolchain.
> 
>> This task does not require qemu,
> 
> The way FreeBSD and its ports tree is set up: yes
> it does.
> 
> You are speculating about a noy-FreeBSD-as-it-is
> context that might be technically possible to
> create someday but that does not now exist.
> 
>> as I don't want to run resulting binaries on host.
>> I just wont to cross compile ports and place them on the target file system.
>> Qemu shouldn't be required for that.
> 
> Sorry, but it is required as things are. Note that
> Warner's notes to you and void's notes to you and
> my notes to you all are referencing the involvement
> of qemu-user-static. Same for the poudriere-devel
> man page.
> 
> FreeBSD's official port-package builds have always
> involved qemu-user-static when native hardware was
> not in use. They would not waste the time and
> resources for such contexts if an alternative had
> been in place.
> 
>> Regards,
>> Michał Kruszewski
>> 
>> 
>> Sent with Proton Mail secure email.
>> 
>> On Sunday, September 14th, 2025 at 2:33 PM, void <[email protected]> wrote:
>> 
>>> Hello,
>>> 
>>> On Sun, Sep 14, 2025 at 09:24:07AM +0000, Michał Kruszewski wrote:
>>> 
>>>> I actually build system from the current main branch.
>>>> How do I set up poudriere in such a case?
>>> 
>>> 
>>> I'd do it like this, on amd64:
>>> 
>>> install poudriere-devel and configure poudriere.conf for your system.
>>> (copy /usr/local/etc/poudriere.conf.sample to poudriere.conf and
>>> edit it)
>>> install qemu-user-static
>>> run this: 'binmiscctl enable armv7'
>>> then
>>> 
>>> poudriere jail -c -j armv7 -J10 -a arm.armv7 -m git+https -K GENERIC-NODEBUG -v main
>>> 
>>> the -J corresponding to the number of cores you may have.
>>> 
>>> Note that poudriere uses qemu-user-static for cross-compilation and
>>> you can't build rust (or anything that uses rust) with it, as far as
>>> I'm aware.
>>> --
> 
> 

Sorry for the screwup.


===
Mark Millard
marklmi at yahoo.com