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AC_LANG_PUSH([C])
AC_MSG_CHECKING([for __sync_add_and_fetch_4])
AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <stdint.h>]],
[[int32_t v = 1; return __sync_add_and_fetch_4 (&v, (int32_t)10);]])],
[AC_MSG_RESULT(yes)
have_sync_add_and_fetch_4=yes],
[AC_MSG_RESULT(no)
have_sync_add_and_fetch_4=no])
AS_IF([test "$have_sync_add_and_fetch_4" = "yes"],
[AC_SUBST(BSON_HAVE_ATOMIC_32_ADD_AND_FETCH, 1)],
[AC_SUBST(BSON_HAVE_ATOMIC_32_ADD_AND_FETCH, 0)])
AC_MSG_CHECKING([for __sync_add_and_fetch_8])
AC_LINK_IFELSE([AC_LANG_PROGRAM([[#include <stdint.h>]],
[[int64_t v; return __sync_add_and_fetch_8 (&v, (int64_t)10);]])],
[AC_MSG_RESULT(yes)
have_sync_add_and_fetch_8=yes],
[AC_MSG_RESULT(no)
have_sync_add_and_fetch_8=no])
AS_IF([test "$have_sync_add_and_fetch_8" = "yes"],
[AC_SUBST(BSON_HAVE_ATOMIC_64_ADD_AND_FETCH, 1)],
[AC_SUBST(BSON_HAVE_ATOMIC_64_ADD_AND_FETCH, 0)])
AC_LANG_POP([C])
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