How can I undersatnd if the userland app is linked using uclibc of glibc?

How can I undersatnd if the userland app is linked using uclibc of glibc?

[Fabio Giovagnini]

Codesurgery toolchain supplies both the library; how can I know building the 
application the linker used uclibc or glibc?

Thanks a lot.

P.S.
It is very surprising the increasing of performaces you can see passing from 
gcc-3-4.5 / linux-2.6.17 to gcc-4.4.1 / linux-2.6.33 (git sh-2.6). REally very 
surprising.

Regards

-- 
Fabio Giovagnini

Aurion s.r.l.
P.I e C.F.
00885711200
Tel. +39.051.594.78.24
Cell. +39.335.83.50.919

Re: How can I undersatnd if the userland app is linked using uclibc

[Andrew Stubbs]

On 19/03/10 17:08, Fabio Giovagnini wrote:
> Codesurgery toolchain supplies both the library; how can I know building the
> application the linker used uclibc or glibc?

Answer 1: Use ldd (from glibc) to see what dynamic linker it uses.

Answer 2: The 'interpreter' (dynamic linker) is encoded into the binary 
as a string. You can read it out with objdump, readelf or even just strings.

If a dynamic executable is linked against glibc it will use 
ld-linux.so.2. If it's linked against uClibc it will use ld-uClibc.so.0.

For statically linked applications, use nm to read the symbol names. If 
it has a symbol "__uClibc_main" then it's uClibc, otherwise it's Glibc.

Andrew