test-stddef: test for (some) offsetof bugs

[gnulib.git] / lib / count-one-bits.h

diff --git a/lib/count-one-bits.h b/lib/count-one-bits.h
index 76e5573..1d84ef0 100644 (file)
--- a/lib/count-one-bits.h
+++ b/lib/count-one-bits.h
@@ -1,5 +1,5 @@
 /* count-one-bits.h -- counts the number of 1-bits in a word.
-   Copyright (C) 2007 Free Software Foundation, Inc.
+   Copyright (C) 2007-2010 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
@@ -25,12 +25,14 @@
 /* Expand the code which computes the number of 1-bits of the local
    variable 'x' of type TYPE (an unsigned integer type) and returns it
    from the current function.  */
-#if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR >= 4)
+#if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 4)
 #define COUNT_ONE_BITS(BUILTIN, TYPE)              \
         return BUILTIN (x);
 #else
 #define COUNT_ONE_BITS(BUILTIN, TYPE)                                       \
-        verify ((TYPE) -1 >> 31 >> 31 <= 3); /* TYPE has at most 64 bits */ \
+        /* This condition is written so as to avoid shifting by more than   \
+           31 bits at once, and also avoids a random HP-UX cc bug.  */      \
+        verify (((TYPE) -1 >> 31 >> 31 >> 2) == 0); /* TYPE has at most 64 bits */ \
         int count = count_one_bits_32 (x);                                  \
         if (1 < (TYPE) -1 >> 31) /* TYPE has more than 32 bits? */          \
           count += count_one_bits_32 (x >> 31 >> 1);                        \