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dnl Copyright (C) 2009 Sun Microsystems
dnl This file is free software; Sun Microsystems
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
#--------------------------------------------------------------------
# Check for GCC Atomic Support
#--------------------------------------------------------------------
AC_DEFUN([PANDORA_HAVE_GCC_ATOMICS],[
AC_CACHE_CHECK(
[whether the compiler provides atomic builtins],
[ac_cv_gcc_atomic_builtins],
[AC_LINK_IFELSE(
[AC_LANG_PROGRAM([],[[
int foo= -10; int bar= 10;
if (!__sync_fetch_and_add(&foo, bar) || foo)
return -1;
bar= __sync_lock_test_and_set(&foo, bar);
if (bar || foo != 10)
return -1;
bar= __sync_val_compare_and_swap(&bar, foo, 15);
if (bar)
return -1;
return 0;
]])],
[ac_cv_gcc_atomic_builtins=yes],
[ac_cv_gcc_atomic_builtins=no])])
AS_IF([test "x$ac_cv_gcc_atomic_builtins" = "xyes"],[
AC_DEFINE(HAVE_GCC_ATOMIC_BUILTINS, 1,
[Define to 1 if compiler provides atomic builtins.])
])
])
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