[OE-core] [PATCH] glib: support target/os/libc-specific Meson cross files

[Richard Purdie]

On Wed, 2020-01-08 at 17:19 +0000, Ross Burton wrote:
> Build systems have a common problem that some tests can only be done
> by
> executing a piece of test code (compared to just compiling or linking
> test
> code).  In a cross-compilation the execution of this code isn't
> possible and the
> Meson solution to this is to allow 'cross properties' to be specified
> in the
> cross files.
> 
> GLib has a number of these, for example determining the direction the
> stack
> grows, whether /proc/self/cmdline exists, or the behaviour of
> snprintf().
> Previously we'd passed values for these to the Glib build for target
> builds, but
> this misses out nativesdk builds (which are also cross-compiled) and
> the fact
> that some of these values are specific to the platform, some are
> specific to the
> host OS, and some are specific to the libc implementation.
> 
> This problem has already been solved for autotools with the siteinfo
> class,
> which turns the target platform/OS/libc variables into filenames
> (such as common
> common-linux common-glibc).  We can look for these in FILESDIR and
> use them as
> cross files.
> 
> Assuming that there are no problems with this appoach it can be moved
> into
> meson.bbclass so that all Meson recipes can use it for their cross
> files.

FWIW this is continuing to cause selftest failures, despite my patch :(

https://autobuilder.yoctoproject.org/typhoon/#/builders/86/builds/610

Cheers,

Richard