[Mesa-dev] [PATCH 3/6] configure.ac: Use PKG_CHECK_VAR for wayland-scanner.

[Emil Velikov]

On 7 March 2017 at 17:29, Frank Binns <frank.binns at imgtec.com> wrote:
> Hi,
>
> On 06/03/17 19:06, Matt Turner wrote:
>>
>> Available since pkg-config-0.28 and pkgconf-0.8.10.
>>
>> The removal of the AC_PATH_PROG is intentional. Use pkg-config.
>
>
> It doesn't seem possible to cross-compile Mesa out of the box due
> to it using the 'host' scanner (found via pkgconfig) instead of the
> 'build' scanner. It seems to me that it should actually try finding
> the scanner via PATH before falling back to pkgconfig. This is what
> Weston does, for example.
>
Mostly some thinking out loud, feel free to not reply.

Consider the following example:

You want to use GCC/Python/other tool that is a) not the system
installed one or b) not found in the default location.
The .pc file makes it easier to know where the tool is rather than
guessing and/or manually setting CC=/path/to/my/local/gcc/build/gcc
and other variables.

I think we can all agree that having those build for 'target' is silly
and sub-optimal.
On the weston case... I simply did want want to annoy people, they
seemed rather attached [1] to having a 'target' wayland-scanner... ;-)

-Emil

[1] https://patchwork.freedesktop.org/patch/42511/