I have identified a bug on the meson macros

i.e even setting __meson_verbose to 0 does not disable verbose

The issue comes from %{?__meson_verbose:--verbose} - where %{?__meson_verbose} does not check on any value, but rather on 'is defined'

A possible solution would be to switch meson_build and meson_install to use ternary operations, like:

%meson_build \
    %{shrink:%{__meson} compile \
    -C %{_vpath_builddir} \
    -j %{_smp_build_ncpus} \
    %[ 0%{?__meson_verbose} ? "--verbose" : "" ]\
    %{nil}}

%meson_install \
    %{shrink:DESTDIR=%{buildroot} %{__meson} install \
    -C %{_vpath_builddir} \
    --no-rebuild \
    %[ ! 0%{?__meson_verbose} ? "--quiet" : "" ] \
    %{nil}}

Drawback: this is only supported from RPM 4.15 on