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

[Thomas Petazzoni via buildroot <buildroot@buildroot.org>]

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.

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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