X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=tests%2Ftest-stdbool.c;h=efa8324678a54ff9ed2702ef7accc60b839e812a;hb=b294b2f93843df25c7e369c65b4f39eab971e45c;hp=30d53217a551cd962a7290262bb019222f068a27;hpb=57fdfd3f8ec62b105c53bcdf6f127c35c7fe7391;p=gnulib.git

diff --git a/tests/test-stdbool.c b/tests/test-stdbool.c
index 30d53217a..efa832467 100644
--- a/tests/test-stdbool.c
+++ b/tests/test-stdbool.c
@@ -1,5 +1,5 @@
 /* Test of <stdbool.h> substitute.
-   Copyright (C) 2002-2007 Free Software Foundation, Inc.
+   Copyright (C) 2002-2007, 2009-2014 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
@@ -16,6 +16,17 @@
 
 /* Written by Bruno Haible <bruno@clisp.org>, 2007.  */
 
+/* We want this test to succeed even when using gcc's -Werror; but to
+   do that requires a pragma that didn't exist before 4.3.0.  */
+#ifndef __GNUC__
+# define ADDRESS_CHECK_OKAY
+#elif __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 3)
+/* No way to silence -Waddress.  */
+#else
+# pragma GCC diagnostic ignored "-Waddress"
+# define ADDRESS_CHECK_OKAY
+#endif
+
 #include <config.h>
 
 #include <stdbool.h>
@@ -39,48 +50,36 @@
  "error: __bool_true_false_are_defined is not defined"
 #endif
 
-#if 0 /* Cannot be guaranteed with gnulib's <stdbool.h>.  */
+/* Several tests cannot be guaranteed with gnulib's <stdbool.h>, at
+   least, not for all compilers and compiler options.  */
+#if HAVE_STDBOOL_H || 3 <= __GNUC__
 struct s { _Bool s: 1; _Bool t; } s;
 #endif
 
 char a[true == 1 ? 1 : -1];
 char b[false == 0 ? 1 : -1];
 char c[__bool_true_false_are_defined == 1 ? 1 : -1];
-#if 0 /* Cannot be guaranteed with gnulib's <stdbool.h>.  */
+#if HAVE_STDBOOL_H || 3 <= __GNUC__ /* See above.  */
 char d[(bool) 0.5 == true ? 1 : -1];
+# ifdef ADDRESS_CHECK_OKAY /* Avoid gcc warning.  */
+/* C99 may plausibly be interpreted as not requiring support for a cast from
+   a variable's address to bool in a static initializer.  So treat it like a
+   GCC extension.  */
+#  ifdef __GNUC__
 bool e = &s;
-#endif
+#  endif
+# endif
 char f[(_Bool) 0.0 == false ? 1 : -1];
+#endif
 char g[true];
 char h[sizeof (_Bool)];
-#if 0 /* See above.  */
+#if HAVE_STDBOOL_H || 3 <= __GNUC__ /* See above.  */
 char i[sizeof s.t];
 #endif
 enum { j = false, k = true, l = false * true, m = true * 256 };
 _Bool n[m];
 char o[sizeof n == m * sizeof n[0] ? 1 : -1];
 char p[-1 - (_Bool) 0 < 0 && -1 - (bool) 0 < 0 ? 1 : -1];
-#if 0 /* Cannot be guaranteed with gnulib's <stdbool.h>.  */
-#if defined __xlc__ || defined __GNUC__
- /* Catch a bug in IBM AIX xlc compiler version 6.0.0.0
-    reported by James Lemley on 2005-10-05; see
-    http://lists.gnu.org/archive/html/bug-coreutils/2005-10/msg00086.html
-    This test is not quite right, since xlc is allowed to
-    reject this program, as the initializer for xlcbug is
-    not one of the forms that C requires support for.
-    However, doing the test right would require a run-time
-    test, and that would make cross-compilation harder.
-    Let us hope that IBM fixes the xlc bug, and also adds
-    support for this kind of constant expression.  In the
-    meantime, this test will reject xlc, which is OK, since
-    our stdbool.h substitute should suffice.  We also test
-    this with GCC, where it should work, to detect more
-    quickly whether someone messes up the test in the
-    future.  */
- char digs[] = "0123456789";
- int xlcbug = 1 / (&(digs + 5)[-2 + (bool) 1] == &digs[4] ? 1 : -1);
-#endif
-#endif
 /* Catch a bug in an HP-UX C compiler.  See
    http://gcc.gnu.org/ml/gcc-patches/2003-12/msg02303.html
    http://lists.gnu.org/archive/html/bug-coreutils/2005-11/msg00161.html
@@ -91,5 +90,29 @@ _Bool *pq = &q;
 int
 main ()
 {
-  return 0;
+  int error = 0;
+
+#if HAVE_STDBOOL_H || 3 <= __GNUC__ /* See above.  */
+# ifdef ADDRESS_CHECK_OKAY /* Avoid gcc warning.  */
+  /* A cast from a variable's address to bool is valid in expressions.  */
+  {
+    bool e1 = &s;
+    if (!e1)
+      error = 1;
+  }
+# endif
+#endif
+
+  /* Catch a bug in IBM AIX xlc compiler version 6.0.0.0
+     reported by James Lemley on 2005-10-05; see
+     http://lists.gnu.org/archive/html/bug-coreutils/2005-10/msg00086.html
+     This is a runtime test, since a corresponding compile-time
+     test would rely on initializer extensions.  */
+  {
+    char digs[] = "0123456789";
+    if (&(digs + 5)[-2 + (bool) 1] != &digs[4])
+      error = 1;
+  }
+
+  return error;
 }