* lib/quotearg.c: Include <wctype.h> early, before the definition of

[gnulib.git] / m4 / stdbool.m4

diff --git a/m4/stdbool.m4 b/m4/stdbool.m4
index 3f6b4bf..2204ecd 100644 (file)
--- a/m4/stdbool.m4
+++ b/m4/stdbool.m4
@@ -1,6 +1,6 @@
 # Check for stdbool.h that conforms to C99.
 
-dnl Copyright (C) 2002-2004 Free Software Foundation, Inc.
+dnl Copyright (C) 2002-2006 Free Software Foundation, Inc.
 dnl This file is free software; the Free Software Foundation
 dnl gives unlimited permission to copy and/or distribute it,
 dnl with or without modifications, as long as this notice is preserved.
@@ -28,6 +28,9 @@ AC_DEFUN([AM_STDBOOL_H],
   AC_SUBST([HAVE__BOOL])
 ])
 
+# AM_STDBOOL_H will be renamed to gl_STDBOOL_H in the future.
+AC_DEFUN([gl_STDBOOL_H], [AM_STDBOOL_H])
+
 # This macro is only needed in autoconf <= 2.59.  Newer versions of autoconf
 # have this macro built-in.
 
@@ -61,19 +64,48 @@ AC_DEFUN([AC_HEADER_STDBOOL],
          char a[true == 1 ? 1 : -1];
          char b[false == 0 ? 1 : -1];
          char c[__bool_true_false_are_defined == 1 ? 1 : -1];
-         char d[(bool) -0.5 == true ? 1 : -1];
+         char d[(bool) 0.5 == true ? 1 : -1];
          bool e = &s;
-         char f[(_Bool) -0.0 == false ? 1 : -1];
+         char f[(_Bool) 0.0 == false ? 1 : -1];
          char g[true];
          char h[sizeof (_Bool)];
          char i[sizeof s.t];
          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 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
+         /* 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
+          */
+         _Bool q = true;
+         _Bool *pq = &q;
        ],
        [
-         return (!a + !b + !c + !d + !e + !f + !g + !h + !i + !j + !k + !l
-                 + !m + !n + !o);
+         *pq |= q;
+         *pq |= ! q;
+         /* Refer to every declared value, to avoid compiler optimizations.  */
+         return (!a + !b + !c + !d + !e + !f + !g + !h + !i + !!j + !k + !!l
+                 + !m + !n + !o + !p + !q + !pq);
        ],
        [ac_cv_header_stdbool_h=yes],
        [ac_cv_header_stdbool_h=no])])