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dnl Checks for availability of GCC's atomic operations builtins.
dnl Defines HAVE_GCC_ATOMIC_BUILTINS if available.
AC_DEFUN([WX_ATOMIC_BUILTINS],
[
AC_REQUIRE([AC_PROG_CC])
if test -n "$GCC"; then
AC_MSG_CHECKING([for __sync_xxx_and_fetch builtins])
AC_CACHE_VAL(wx_cv_cc_gcc_atomic_builtins, [
AC_TRY_LINK(
[],
[
unsigned int value=0;
volatile unsigned int r1 = __sync_add_and_fetch(&value, 2);
volatile unsigned int r2 = __sync_sub_and_fetch(&value, 1);
],
wx_cv_cc_gcc_atomic_builtins=yes,
wx_cv_cc_gcc_atomic_builtins=no)
])
AC_MSG_RESULT([$wx_cv_cc_gcc_atomic_builtins])
if test $wx_cv_cc_gcc_atomic_builtins = yes; then
AC_DEFINE([HAVE_GCC_ATOMIC_BUILTINS])
fi
fi
])
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