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$NetBSD: patch-m4_atomic__operations.m4,v 1.1 2022/10/07 20:22:56 he Exp $
Also, test whether we can do atomics on time_t,
not possible on 32-bit CPUs running NetBSD (where time_t is __int64_t)
--- m4/atomic_operations.m4.orig 2018-05-04 09:37:56.000000000 +0000
+++ m4/atomic_operations.m4
@@ -10,39 +10,52 @@
AC_DEFUN([RS_ATOMIC_OPERATIONS],
[AC_CACHE_CHECK([whether the compiler provides atomic builtins], [ap_cv_atomic_builtins],
[AC_TRY_RUN([
+#include <sys/types.h>
int main()
{
unsigned long val = 1010, tmp, *mem = &val;
+ time_t tval = 1010, ttmp, *tmem = &tval;
if (__sync_fetch_and_add(&val, 1010) != 1010 || val != 2020)
return 1;
-
tmp = val;
-
if (__sync_fetch_and_sub(mem, 1010) != tmp || val != 1010)
return 1;
-
if (__sync_sub_and_fetch(&val, 1010) != 0 || val != 0)
return 1;
-
tmp = 3030;
-
if (__sync_val_compare_and_swap(mem, 0, tmp) != 0 || val != tmp)
return 1;
-
if (__sync_lock_test_and_set(&val, 4040) != 3030)
return 1;
-
mem = &tmp;
-
if (__sync_val_compare_and_swap(&mem, &tmp, &val) != &tmp)
return 1;
+ if (__sync_fetch_and_add(&tval, 1010) != 1010 || tval != 2020)
+ return 1;
+ ttmp = tval;
+ if (__sync_fetch_and_sub(tmem, 1010) != ttmp || tval != 1010)
+ return 1;
+ if (__sync_sub_and_fetch(&tval, 1010) != 0 || tval != 0)
+ return 1;
+ ttmp = 3030;
+ if (__sync_val_compare_and_swap(tmem, 0, ttmp) != 0 || tval != ttmp)
+ return 1;
+ if (__sync_lock_test_and_set(&tval, 4040) != 3030)
+ return 1;
+ tmem = &ttmp;
+ if (__sync_val_compare_and_swap(&tmem, &ttmp, &tval) != &ttmp)
+ return 1;
+
__sync_synchronize();
if (mem != &val)
return 1;
+ if (tmem != &tval)
+ return 1;
+
return 0;
}], [ap_cv_atomic_builtins=yes], [ap_cv_atomic_builtins=no], [ap_cv_atomic_builtins=no])])
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