Re: [dpdk-dev] [PATCH v1] build: ccache support for cross build

[Jerin Jacob <jerinjacobk@gmail.com>]

On Thu, Jun 2, 2022 at 4:25 PM Thomas Monjalon <thomas@monjalon.net> wrote:
>
> 02/06/2022 11:43, Jerin Jacob:
> > On Thu, Jun 2, 2022 at 3:11 PM Bruce Richardson
> > <bruce.richardson@intel.com> wrote:
> > >
> > > On Thu, Jun 02, 2022 at 02:53:55PM +0530, jerinj@marvell.com wrote:
> > > > From: Jerin Jacob <jerinj@marvell.com>
> > > >
> > > > By default, ccache is not used for cross build[1].
> > > > Update all cross files to use ccache if it is available
> > > > in build machine.
> > > >
> > > > [1]
> > > > https://mesonbuild.com/Machine-files.html
> > > >
> > > > Signed-off-by: Jerin Jacob <jerinj@marvell.com>
> > >
> > > Does this still work even if ccache is not available? That's not fully
> >
> > Yes.
> >
> > > clear from the docs, but it seems to be that if an array is passed the
> > > whole array is used as the command, rather than just one element of the
> > > array. That would imply that cross-builds now require ccache. Is that
> > > acceptable?
> >
> > I have removed ccache from the build machine still it works.
>
> I don't understand why it works without ccache.

Meson is detecting valid compiler prefix. ccache is one of them.

See
https://github.com/fabio-porcedda/meson/commit/44db495f5ece43645ca3994dc95895c76a828530
https://github.com/mesonbuild/meson/issues/1392



>
> In general, I would prefer we have a mechanism to update the cross file
> on the fly, depending on the setup.

I believe, It would be a departure from the meson cross-file concept.

> We have this for toolchain prefix name.
> The prefix depends on where the toochain comes from.
> In a "normal" build system, we set the prefix with an environment variable,
> not by writing a file.
>
>