How to find libs version (Newlib and UCLIBC) ?

[Name lastlong]

> Not that I know of.  Some libraries define macros with
> their version
> information; e.g., glibc defines __GLIBC__ and
> __GLIBC_MINOR__.
> However, I don't know of any standard approach.1

Thanks. I dint check the similar defines for Newlib or UClibc. 
How do we use above in application? 
Shall I check pre-processed files (source files where this define is used)?

Brew.