Disable user name lookup in static builds against glibc

[cgzones]

Static linking against glibc might crash due to usage of NSS modules, e.g. via getpwuid() (see #503).
The linker also warns about it:

warning: Using 'getpwuid' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking

[BenBE]

@cgzones Anything still missing here?

[cgzones]

There might be still hidden usage of NSS modules, e.g. a static build reports:

/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/14/../../../x86_64-linux-gnu/libsystemd.a(src_basic_user-util.c.o): in function `get_group_creds':
(.text.get_group_creds+0x84): warning: Using 'getgrgid' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/14/../../../x86_64-linux-gnu/libsystemd.a(src_basic_user-util.c.o): in function `getgrgid_malloc':
(.text.getgrgid_malloc+0x80): warning: Using 'getgrgid_r' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/14/../../../x86_64-linux-gnu/libsystemd.a(src_basic_user-util.c.o): in function `get_group_creds':
(.text.get_group_creds+0xe4): warning: Using 'getgrnam' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/14/../../../x86_64-linux-gnu/libsystemd.a(src_basic_user-util.c.o): in function `getgrnam_malloc':
(.text.getgrnam_malloc+0x7c): warning: Using 'getgrnam_r' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/14/../../../x86_64-linux-gnu/libsystemd.a(src_libsystemd_sd-bus_sd-bus.c.o): in function `bus_start_address.part.0':
(.text.bus_start_address.part.0+0x962): warning: Using 'getaddrinfo' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
/usr/bin/ld: Action.o: in function `Action_setUserOnly':
./Action.c:120:(.text+0x2158): warning: Using 'getpwnam' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/14/../../../x86_64-linux-gnu/libsystemd.a(src_basic_user-util.c.o): in function `getpwnam_malloc':
(.text.getpwnam_malloc+0x7c): warning: Using 'getpwnam_r' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
/usr/bin/ld: Settings.o: in function `Settings_new':
./Settings.c:828:(.text+0x2928): warning: Using 'getpwuid' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/14/../../../x86_64-linux-gnu/libsystemd.a(src_basic_user-util.c.o): in function `getpwuid_malloc':
(.text.getpwuid_malloc+0x80): warning: Using 'getpwuid_r' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking

Maybe it's best to recommend not using static builds on Linux against glibc?

[BenBE]

Can we check for glibc+static build in configure.ac and just issue a warning about this?