[PATCH 0/3] Fix xmm_t to rte_xmm_t scalar conversion

[Bruce Richardson]

On Tue, Jun 21, 2022 at 02:37:51PM +0200, Stanisław Kardach wrote:
> On Tue, Jun 21, 2022 at 1:53 PM Thomas Monjalon <thomas at monjalon.net> wrote:
> > <snip>
> > If it is made intentionally hard, it is just a wrong design.
> > A toolchain prefix is just a name.
> > We can have 2 toolchains compiled with the same name and different behaviours.
> > And we can have 2 similar toolchains with a different name.
> I don't think meson will allow it anytime soon (see [1]). The
> reasoning being that it's easy to screw up the environment and not
> notice it where as files are persistent.
> >
> > > So should the direction be environment or rather separating
> > > cross-files into arch-part and toolchain-parts and letting user create
> > > his own toolchain part while maintaining a matrix of supported
> > > combinations for CI? I'm not advocating either, just want to wrap my
> > > head around it.
> >
> > We should be able to use a toolchain compiled anywhere
> > without modifying the cross files, just because a "-gnu-" is missing
> > or any other irrelevant detail.
> I've checked that if I remove the binaries from a cross-file, then
> specifying CC/CXX/AR/STRIP environment variables is picked up by
> meson:
>   AR=riscv64-unknown-linux-gnu-ar \
>     STRIP=riscv64-unknown-linux-gnu-strip \
>     CC=riscv64-unknown-linux-gnu-gcc \
>     CXX=riscv64-unknown-linux-gnu-g++ \
>     meson build-rv-test --cross-file=config/riscv/riscv64_linux_gcc
> But then there are no default values.
> 
> A suggested frankenstein-like solution in [1] is to use a script that
> generates a cross-file with [constants] section and launches meson
> with it.
> 
> [1] https://github.com/mesonbuild/meson/issues/9#issuecomment-381410972

This is all incidental to the original fix, which is to replace cpp with
g++ in the existing cross files. Any update to how cross files are used by
our DPDK scripts, is a different discussion for a different day!
[Sorry to have brought it up here, it just seemed somewhat relevant at the
time!]