When I'm compiling my elf, it is "best practice" to make it link against the oldest version of glibc I can, so it will work both on new and old versions of glibc.
i.e. if I use realpath, which in
readelf output of glibc we can see has both a GLIBC_2.0 version and a GLIBC_2.3 version, I want to use the old version so my ELF would work on glibc 2.0/1/2.
But the GLIBC_2.3 version was probably developed and upgraded since it was published, and I guess GLIBC_2.0 version hasn't changed since glibc 2.3 has been published. So I guess I want my elf to use GLIBC_2.3 version when it is present, and when not, to fallback to the GLIBC_2.0 version.
Is is possible? Or what don't I understand?