Re: IBus and different GTK versions

[Ludovic Courtès]

宋文武 <address@hidden> skribis:

> Ricardo Wurmus <address@hidden> writes:
>
>> [...]
>>
>> It seems that GTK3 only looks for
>> ‘$libdir/gtk-3.0/3.0.0/immodules.cache’ and GTK2 only looks for
>> ‘$libdir/gtk-2.0/2.10.0/immodules.cache’ by default, where ‘$libdir’ is
>> ‘$out/lib’ of the GTK package.  (According to
>> https://developer.gnome.org/gtk3/stable/gtk-running.html)
>>
>> To make IBus work we need to find a way to make the different major
>> versions of GTK respect different ‘immodules.cache’ files that are *not*
>> located in their ‘$libdir’.  In that case we could generate a fresh
>> ‘immodules.cache’ file for each major GTK version when building a
>> profile.  Unfortunately, I haven’t been able to find any documented
>> means to achieve this.  It might require patching the GTKs to check an
>> additional path or environment variable.
>>
> We can set 'GTK_EXE_PREFIX' to the '~/.guix-profile', and generate the
> 'immodules.cache' files in a profile hook.  It will work for both gtk2
> and gtk3 applications.

What other things does ‘GTK_EXE_PREFIX’ affect?

The plan you suggest sounds good to me, my only concern is whether
‘GTK_EXE_PREFIX’ is too broad for our purposes.

Thanks,
Ludo’.