eliminate warnings compiling libiberty/fibheap.c

[Ben Elliston]

After discussing this code with Kazu, I decided that this could be
refined to minimise the likelihood of a warning being emitted when
compiling libiberty with -pedantic.

Instead, the use of the `unsigned long bitfields' GNU C extension is
now only used when it's really needed: when the sizeof(int) < 4, thus
requiring a wider type in order to get a 31-bit bitfield.

Okay to commit?

[include]
2004-12-10  Ben Elliston  <bje@au.ibm.com>

	* fibheap.h (struct fibnode): Only use unsigned long bitfields
	when __GNUC__ is defined and ints are less than 32-bits wide.

Index: fibheap.h
===================================================================
RCS file: /home/bje/src-cvs/src/include/fibheap.h,v
retrieving revision 1.6
diff -u -p -u -r1.6 fibheap.h
--- fibheap.h	19 Dec 2003 16:50:48 -0000	1.6
+++ fibheap.h	10 Dec 2004 04:55:11 -0000
@@ -59,7 +59,7 @@ typedef struct fibnode
   struct fibnode *right;
   fibheapkey_t key;
   void *data;
-#ifdef __GNUC__
+#if defined (__GNUC__) && SIZEOF_INT < 4
   __extension__ unsigned long int degree : 31;
   __extension__ unsigned long int mark : 1;
 #else

[libiberty]
2004-12-10  Ben Elliston  <bje@au.ibm.com>

	* configure.ac: Invoke AC_CHECK_SIZEOF for sizeof (int).
	* configure: Regenerate.
	* config.in: Likewise.

Index: configure.ac
===================================================================
RCS file: /home/bje/src-cvs/src/libiberty/configure.ac,v
retrieving revision 1.7
diff -u -p -u -r1.7 configure.ac
--- configure.ac	2 Sep 2004 07:04:53 -0000	1.7
+++ configure.ac	10 Dec 2004 04:55:47 -0000
@@ -165,6 +165,9 @@ AC_HEADER_TIME
 
 libiberty_AC_DECLARE_ERRNO
 
+# Determine the size of an int for struct fibnode.
+AC_CHECK_SIZEOF([int])
+
 AC_CHECK_TYPE(uintptr_t, unsigned long)
 
 # Look for a 64-bit type.
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