Symbols in header files should almost always have an "nm" prefix.
That is not purely cosmetic, because core modules (like libnm-device-plugin*.so
and libnm-settings-plugin*so) should re-use the symbols of the NetworkManager
binary. For NetworkManager we generate a linker version script to only expose
the symbols that are needed. It thereby excludes symbols that don't have an "nm"
prefix.
Hence, the plugins otherwise cannot reuse the global symbol.
The only reason that we currently don't have a linker error is because
we also link the logging static library into the plugin modules. That is
wrong, because we should not duplicate these symbols.
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