Ian Mordey <ian.mor...@wandisco.com> writes: > Undefined first referenced > symbol in file > __sync_add_and_fetch
Modern compilers usually provide fast "atomics" and most code will try to use compiler atomics if possible. Subversion itself relies on APR for atomics so what matters is how you configured and built APR. I am surprised Subversion 1.8 and 1.9 are different. Do they use the same APR? Is APR built the same way using the same compiler? Looking at include/arch/unix/apr_arch_atomic.h in the APR build it appears that there are three possible atomic implementations on Solaris: 1) generic, 2) builtin, 3) solaris. >From the error message your build appears to use 2) builtin, so I expect you to have USE_ATOMICS_GENERIC unset and HAVE_ATOMIC_BUILTINS set. If you look at include/arch/unix/apr_private.h in your APR build you should be able to confirm that. APR's configure script controls both symbols. Your compiler is not providing the functions required for 2) builtin to work. You can force the APR build to use 1) generic with the configure option --disable-nonportable-atomics. It might be better to get APR to use 3) solaris by unsetting HAVE_ATOMIC_BUILTINS after configure and before building. It would be good to understand which atomics you are using, why APR chooses the wrong ones, how we can fix APR to choose the right ones automatically, and why 1.8 and 1.9 are different. -- Philip
