| | 1 | |
| | 2 | dnl Checks for availability of GCC's atomic operations builtins. |
| | 3 | dnl Defines HAVE_GCC_ATOMIC_BUILTINS if available. |
| | 4 | |
| | 5 | AC_DEFUN([WX_ATOMIC_BUILTINS], |
| | 6 | [ |
| | 7 | AC_REQUIRE([AC_PROG_CC]) |
| | 8 | if test -n "$GCC"; then |
| | 9 | AC_MSG_CHECKING([for __sync_fetch_and_add and __sync_sub_and_fetch builtins]) |
| | 10 | AC_CACHE_VAL(wx_cv_cc_gcc_atomic_builtins, [ |
| | 11 | AC_TRY_LINK( |
| | 12 | [], |
| | 13 | [ |
| | 14 | unsigned int value=0; |
| | 15 | /* wxAtomicInc doesn't use return value here */ |
| | 16 | __sync_fetch_and_add(&value, 2); |
| | 17 | __sync_sub_and_fetch(&value, 1); |
| | 18 | /* but wxAtomicDec does, so mimic that: */ |
| | 19 | unsigned int r2 = __sync_sub_and_fetch(&value, 1); |
| | 20 | ], |
| | 21 | wx_cv_cc_gcc_atomic_builtins=yes, |
| | 22 | wx_cv_cc_gcc_atomic_builtins=no) |
| | 23 | ]) |
| | 24 | AC_MSG_RESULT([$wx_cv_cc_gcc_atomic_builtins]) |
| | 25 | if test $wx_cv_cc_gcc_atomic_builtins = yes; then |
| | 26 | AC_DEFINE([HAVE_GCC_ATOMIC_BUILTINS]) |
| | 27 | fi |
| | 28 | fi |
| | 29 | ]) |
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