diff --git a/include/ChangeLog b/include/ChangeLog
index 6aba7751e758c5befabb57308d2ba197951e1ec2..4bd5e81f66e9532e289e43cc540d6190a33f27a8 100644
--- a/include/ChangeLog
+++ b/include/ChangeLog
@@ -1,3 +1,8 @@
+2009-07-24  Ian Lance Taylor  <iant@google.com>
+
+	PR bootstrap/40854
+	* libiberty.h (xcrc32): Rename from crc32.
+
 2009-07-24  Ian Lance Taylor  <iant@google.com>
 
 	* libiberty.h (crc32): Declare.
diff --git a/include/libiberty.h b/include/libiberty.h
index e50ad64712ea10f16dc5c1b6a893cc5c6e9a181e..a7716e4a414fb3856e76627ce7048ded7457a660 100644
--- a/include/libiberty.h
+++ b/include/libiberty.h
@@ -313,7 +313,7 @@ extern double physmem_total (void);
 extern double physmem_available (void);
 
 /* Compute the 32-bit CRC of a block of memory.  */
-extern unsigned int crc32 (const unsigned char *, int, unsigned int);
+extern unsigned int xcrc32 (const unsigned char *, int, unsigned int);
 
 /* These macros provide a K&R/C89/C++-friendly way of allocating structures
    with nice encapsulation.  The XDELETE*() macros are technically
diff --git a/libiberty/ChangeLog b/libiberty/ChangeLog
index 516a90d58fcb693485a2e24bc4d414390532f9a4..6033935edc3065d41e031fab3a7036344e173b0e 100644
--- a/libiberty/ChangeLog
+++ b/libiberty/ChangeLog
@@ -1,3 +1,8 @@
+2009-07-24  Ian Lance Taylor  <iant@google.com>
+
+	PR bootstrap/40854
+	* crc32.c (xcrc32): Rename from crc32.
+
 2009-07-24  Ian Lance Taylor  <iant@google.com>
 
 	* crc32.c: New file.
diff --git a/libiberty/crc32.c b/libiberty/crc32.c
index 2171a3d1c7fbe9e7611fafdc36310b1c57a7c569..c12916b5216a469d1b6a14e997aa72974783826f 100644
--- a/libiberty/crc32.c
+++ b/libiberty/crc32.c
@@ -150,12 +150,25 @@ protocol for the @samp{qCRC} command.  In order to get the same
 results as gdb for a block of data, you must pass the first CRC
 parameter as @code{0xffffffff}.
 
+This CRC can be specified as:
+
+  Width  : 32
+  Poly   : 0x04c11db7
+  Init   : parameter, typically 0xffffffff
+  RefIn  : false
+  RefOut : false
+  XorOut : 0
+
+This differs from the "standard" CRC-32 algorithm in that the values
+are not reflected, and there is no final XOR value.  These differences
+make it easy to compose the values of multiple blocks.
+
 @end deftypefn
 
 */
 
 unsigned int
-crc32 (const unsigned char *buf, int len, unsigned int init)
+xcrc32 (const unsigned char *buf, int len, unsigned int init)
 {
   unsigned int crc = init;
   while (len--)