Re: [Buildroot] [PATCH 00/13] package/nodejs: rework cross-building

[Alexandru Ardelean <ardeleanalex@gmail.com>]

On Tue, Aug 9, 2022 at 2:42 PM Thomas Petazzoni
<thomas.petazzoni@bootlin.com> wrote:
>
> Hello Alexandru,
>
> First of all, thanks a lot for your work on NodeJS. It is obviously a
> complex package, which has already seen quite a lot of effort, so we
> need to be careful when changing it.
>
> On Tue,  9 Aug 2022 10:56:51 +0300
> Alexandru Ardelean <ardeleanalex@gmail.com> wrote:
>
> > I tried to build nodejs from Buildroot master, but I couldn't.
> > It could be that I did not setup something properly with regards to the
> > 'v8-qemu-wrapper' stuff. I kept getting execution errors, when trying to
> > run the nodejs build-tools scripts (see details in the patches).
> > Either the host-qemu stuff isn't working correctly, or it needs some extra
> > setup.
>
> I will give a test to your patch series and report back, but I'm
> fearing that PATCH 03/18 will break the build.
>
> > That eventually sent me down the rabbit-hole of trying to get nodejs to
> > build for ARM64 (where I wanted it). It seems that nodejs cross-building
> > can be done via their own infra-structure, which isn't perfect, but it
> > seems usable; and it also looks like a good idea.
> >
> > Using their cross-building stuff, has some issues/considerations:
> > * it's easiest when building a 32/64-bit target on a (same bit-width)
> >   32/64-bit host; the host-{c-ares,icu,libuv,zlib} tools can be used
> >   for nodejs' host tools (in their cross-build infrastructure/tools)
> > * when building a 32-bit target on a 64-bit host, the nodejs cross-building
> >   logic will add the -m32 CFLAG, which will mean that the
> >   host-{c-ares,icu,libuv,zlib} tools will be unusable (they got compiled
> >   for 64-bit and are un-linkable to 32-bit binaries)
> >   This requires that the user install on their system the
> >   host-{c-ares,icu,libuv,zlib} 32 bit versions. I suspect that the
> >   BR2_HOSTARCH_NEEDS_IA32_{LIBS,COMPILER} symbols are intented for this
> > * I haven't tried to build 64-bit targets on 32-bit hosts, though I'd
> >   guess this is a rare corner case.
>
> No, unfortunately it is not. A solution that doesn't support building a
> 64-bit target on a 32-bit host is not going to be acceptable for
> Buildroot at this point I'm afraid.

There may be a chance that this could automagically work (64 bit
target to 32 bit host).
I did not test it. I will try to make some time for testing it in a
32-bit x86 docker image.

I figured this may be unacceptable.
The least I was hoping to get here, is someone to tell me what I am
doing wrong with that v8-qemu-wrapper stuff.

>
> I will try to have a look in more details, even though I must say I'm
> pretty hermetic to the overall NodeJS build system :-/
>
> Best regards,
>
> Thomas
> --
> Thomas Petazzoni, co-owner and CEO, Bootlin
> Embedded Linux and Kernel engineering and training
> https://bootlin.com
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