We can use the __sync builtin atomics also on other architectures than IA64. GCC 4.7 documentation notes that these builtins are ``legacy'' -- adding support for the newer GCC __atomic atomics should be fairly easy.
Suggested-by: Alexander Toresson <alexander.toresson@gmail.com>
[Edit: renamed to libunwind-generic.pc and some .pc files created only when needed -- asharma@fb.com]
According to the gnu autoconf manual, configure.ac is now preferred.