libnm has a dependency on 'libnmdbus_dep', which contains 'link_with:
libnmdbus'. This however only enforces that libnm is linked after the
libnmdbus static library is built; it doesn't give any guarantees
about the compilation phase.
We need to make libnm compilation depend on the generated header
files. The output of 'gnome.gdbus_codegen' is an array with the header
file in the second position; use it to add a proper
dependency. Unfortunately this works only with meson >= 0.46.
In the future libnm will no longer use gdbus generated code and this
dependency will not be needed anymore.
https://gitlab.freedesktop.org/NetworkManager/NetworkManager/issues/286
a59a8aa033