On Tue, 25 Aug 2009, Eric Dumazet wrote:

Thread model: posix
gcc version 4.4.1 (GCC)
# pwd
/opt/src/lldiag-0.14
# make
gcc -Wall -omcast mcast.c -lrt -lm
mcast.c: In function ?set_ip?:
mcast.c:121: warning: implicit declaration of function ?htons?
mcast.c: In function ?build_pattern_array?:
mcast.c:168: warning: implicit declaration of function ?htonl?
/tmp/cc4sYCDr.o: In function `lock':
mcast.c:(.text+0xcad): undefined reference to `__sync_fetch_and_add_4'
collect2: ld returned 1 exit status
make: *** [mcast] Error 1


I have no idea where is defined sync_fetch_and_add

Its a GCC builtin for x86 sigh. Ok will put out 0.15 that disables their
use by default.