diff options
Diffstat (limited to 'configure.in')
| -rw-r--r-- | configure.in | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/configure.in b/configure.in index 073da9355b..5dc59396a2 100644 --- a/configure.in +++ b/configure.in @@ -775,6 +775,19 @@ if test "$GCC" = yes; then AC_DEFINE_UNQUOTED([RUBY_ALIAS_FUNCTION_VOID(prot, name, args)], [RUBY_ALIAS_FUNCTION_TYPE(void, prot, name, args)]) fi + AC_CACHE_CHECK([for atomic builtins], [rb_cv_gcc_atomic_builtins], [ + AC_TRY_LINK([unsigned char atomic_var;], + [ + __sync_lock_test_and_set(&atomic_var, 0); + __sync_lock_test_and_set(&atomic_var, 1); + __sync_fetch_and_add(&atomic_var, 1); + __sync_fetch_and_sub(&atomic_var, 1); + ], + [rb_cv_gcc_atomic_builtins=yes], + [rb_cv_gcc_atomic_builtins=no])]) + if test "$rb_cv_gcc_atomic_builtins" = yes; then + AC_DEFINE(HAVE_GCC_ATOMIC_BUILTINS) + fi fi AC_CACHE_CHECK(for exported function attribute, rb_cv_func_exported, [ |