On 11/19/2010 10:14 AM, Christophe Lyon wrote: > >> >> 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 ? It was to make them faster by avoiding a trip through the PLT. > 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). There are a couple of targets that use libcalls for atomics. You should be able simply to link with -lgcc_s -lgcc Andrew.
