Invoking atomic functions from a C++ shared lib (or should I force linking with -lgcc?)

[Christophe Lyon]

> 
> What I have found is that g++ (unlike gcc) links with -lgcc_s instead of
> -lgcc and that the atomic functions are present in libgcc.a and not in
> libgcc_s.so.
> 

Anyone knows the rationale for the absence of functions such as
__sync_fetch_and_add (and more generally all __sunc* functions) from
libgcc_s.so ?
Is it a bug/feature specific to the ARM port? (on x86 for instance, such
functions do not exist, the corresponding builtin is fully expanded and
requires not lib call).

Thanks!

Christophe.