[Buildroot] Making the Meson integration compatible with per-package folders

Peter Seiderer ps.report at gmx.net
Sat Nov 17 21:56:46 UTC 2018

Hello Thomas,

On Fri, 16 Nov 2018 16:48:59 +0100, Thomas Petazzoni <thomas.petazzoni at bootlin.com> wrote:

> Eric, Peter,
> I don't know if you have followed the discussion, but I recently sent a
> new iteration of the per-package folder series [1], which allows to
> support top-level parallel build.

Not in details (and did no test the patches yet)...

> Currently the Meson integration in Buildroot doesn't work with this
> per-package folder stuff.
> The initial issue is that:
>    --cross-file=$(HOST_DIR)/etc/meson/cross-compilation.conf
> should be:
>    --cross-file=$$(HOST_DIR)/etc/meson/cross-compilation.conf
> But of course, behind that, there's a bigger issue: this
> cross-compilation.conf hardcodes the compiler path, library path, etc.
> However, with per-package folders, we really need to use the compiler
> and libraries from the per-package folder of the current package.
> To achieve this, we will need to generate a per-package
> cross-compilation.conf, which is something Peter was already proposing
> in http://patchwork.ozlabs.org/patch/946599/. However, compared to this
> patch, we would need:
>  (1) Replacing not only the CFLAGS, but also the compiler/library paths.

First draft version:


Maybe $$($$(PKG)_SRCDIR) could be exchanged with $$(HOST_DIR)...

>  (2) Producing a final cross-compilation.conf, which can be used by
>      people using the toolchain outside of Buildroot.

No problem, just keep the original code in package/meson/meson.mk?


> I am sending this e-mail to see if you are willing/available to help on
> this, or if you would like me to take over this work and propose a
> patch series.
> Thanks a lot!
> Thomas
> [1] http://patchwork.ozlabs.org/project/buildroot/list/?series=75909

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