stdalign-tests: new module

[gnulib.git] / tests / test-stdalign.c

diff --git a/tests/test-stdalign.c b/tests/test-stdalign.c
new file mode 100644 (file)
index 0000000..136661a
--- /dev/null
+++ b/tests/test-stdalign.c
@@ -0,0 +1,77 @@
+/* Test of <stdalign.h>.
+   Copyright 2009-2011 Free Software Foundation, Inc.
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+/* Written by Paul Eggert, inspired by Bruno Haible's test-alignof.c.  */
+
+#include <config.h>
+
+#include <stdalign.h>
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include "verify.h"
+
+typedef long double longdouble;
+typedef struct { char a[1]; } struct1;
+typedef struct { char a[2]; } struct2;
+typedef struct { char a[3]; } struct3;
+typedef struct { char a[4]; } struct4;
+
+verify (__alignof_is_defined == 1);
+#ifndef alignof
+# error "alignof is not a macro"
+#endif
+
+#if __alignas_is_defined
+verify (__alignas_is_defined == 1);
+# ifndef alignas
+#  error "alignas is not a macro"
+# endif
+# define CHECK_ALIGNAS(type) \
+    type alignas (1 << 3) type##_alignas; \
+    type _Alignas (1 << 3) type##_Alignas;
+#else
+# define CHECK_ALIGNAS(type)
+#endif
+
+#define CHECK(type) \
+  typedef struct { char slot1; type slot2; } type##_helper; \
+  verify (alignof (type) == offsetof (type##_helper, slot2)); \
+  verify (_Alignof (type) == alignof (type)); \
+  const int type##_alignment = alignof (type); \
+  CHECK_ALIGNAS(type)
+
+CHECK (char)
+CHECK (short)
+CHECK (int)
+CHECK (long)
+CHECK (float)
+CHECK (double)
+CHECK (longdouble)
+#ifdef INT64_MAX
+CHECK (int64_t)
+#endif
+CHECK (struct1)
+CHECK (struct2)
+CHECK (struct3)
+CHECK (struct4)
+
+int
+main ()
+{
+  return 0;
+}