[glib2] Update to version 2.78.4. JB#61330

[mlehtima]

Requires integration of https://github.com/sailfishos/pcre2

[attah]

Please consider sneaking in a BuildRequires: ccache

[pvuorela]

Please consider sneaking in a BuildRequires: ccache

Why?

[attah]

Because it is seems to be the case; i.e. wouldn't build with a clean-ish sfdk for me.
Other environments seems to have it somewhat by default, or left over since a previous package build, like i had: sailfishos/glib-networking#2 (comment)

[pvuorela]

Because it is seems to be the case; i.e. wouldn't build with a clean-ish sfdk for me.

I don't think there's anything really here depending on it. I recall some meson related ccache detection problem leading to failures, but sprinkling the ccache dependency around would feel like papering over it. Should work if it's manually installed, I'd assume.

[attah]

You seem to be correct in that meson detects e.g.
``C++ compiler for the host machine: ccache c++ (gcc 8.3.0 "aarch64-meego-linux-gnu-c++ (Linaro GCC 8.2-2018.08~dev) 8.3.0 20190222 (Sailfish OS gcc 8.3.0-7)")

...but then ccache isn't actually available.
And indeed it seems optional: https://mesonbuild.com/Feature-autodetection.html

[attah]

Newer meson seems to have a related improvement; but it didn't help.... and i still think we are surviving on that other packages have installed ccache before and/or it being generally available.

[mlehtima]

Probably would make sense to have ccache installed in sdk targets or tooling (which ever is correct place for it) by default.

[pvuorela]

Probably would make sense to have ccache installed in sdk targets or tooling (which ever is correct place for it) by default.

Indeed if not fixing the real problem, this would be a nicely isolated workaround. One place instead of here and there.

For the bug itself, I'm not sure is it even a meson bug or something towards sb2.

[pvuorela]

Maybe everyone noticed, but for reference the ccache issue fixed there sailfishos/scratchbox2#24

[pvuorela]

Still good