Statically linking against glibc

[Sam Varshavchik]

gcc emits the following diagnostic after statically linking an app: 
"warning: Using 'getpwnam' in statically linked applications requires at 
runtime the shared libraries from the glibc version used for linking".

I'd like to understand the underlying reason for this requirement, for my 
own enlightement.  I can make a couple of guesses:

1) getpw()/getgr() needs to read nsswitch.conf, which is typically packaged 
together with libc.so

2) Even the static libc.a dlopens various /lib/libnss_*.so to handle 
getpw()/getgr() requests.

Is this it, or are there other reasons for this?

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