2005-04-02  Andrew Cagney  <cagney@gnu.org>

	* symfile.c (separate_debug_file_exists): When the CRCs mismatch
	print a warning.
	(find_separate_debug_file): Pass in the objfile's name.

Index: gdb-6.8/gdb/symfile.c
===================================================================
--- gdb-6.8.orig/gdb/symfile.c	2008-01-29 23:47:20.000000000 +0100
+++ gdb-6.8/gdb/symfile.c	2008-07-14 10:26:30.000000000 +0200
@@ -1348,7 +1348,8 @@ get_debug_link_info (struct objfile *obj
 }
 
 static int
-separate_debug_file_exists (const char *name, unsigned long crc)
+separate_debug_file_exists (const char *name, unsigned long crc,
+			    const char *parent_name)
 {
   unsigned long file_crc = 0;
   int fd;
@@ -1357,6 +1358,12 @@ separate_debug_file_exists (const char *
 
   fd = open (name, O_RDONLY | O_BINARY);
   if (fd < 0)
+    /* Fail silently, this preserves existing behavior.  The
+       assumption here is that the file wasn't found because there's
+       no file to find (we shouldn't be printing warnings about
+       missing debug info files when the user hasn't installed them).
+       The alternative is to complain here - that better belongs in a
+       warning.  */
     return 0;
 
   while ((count = read (fd, buffer, sizeof (buffer))) > 0)
@@ -1364,7 +1371,16 @@ separate_debug_file_exists (const char *
 
   close (fd);
 
-  return crc == file_crc;
+  if (crc != file_crc)
+    {
+      warning (_("the debug information found in \"%s\""
+		 " does not match \"%s\" (CRC mismatch).\n"),
+	       name, parent_name);
+      return 0;
+    }
+
+  /* No worries!  */
+  return 1;
 }
 
 char *debug_file_directory = NULL;
@@ -1416,6 +1432,8 @@ find_separate_debug_file (struct objfile
   basename = get_debug_link_info (objfile, &crc32);
 
   if (basename == NULL)
+    /* There's no separate debug info, hence there's no way we could
+       load it => no warning.  */
     return NULL;
 
   dir = xstrdup (objfile->name);
@@ -1443,7 +1461,7 @@ find_separate_debug_file (struct objfile
   strcpy (debugfile, dir);
   strcat (debugfile, basename);
 
-  if (separate_debug_file_exists (debugfile, crc32))
+  if (separate_debug_file_exists (debugfile, crc32, objfile->name))
     {
       xfree (basename);
       xfree (dir);
@@ -1456,7 +1474,7 @@ find_separate_debug_file (struct objfile
   strcat (debugfile, "/");
   strcat (debugfile, basename);
 
-  if (separate_debug_file_exists (debugfile, crc32))
+  if (separate_debug_file_exists (debugfile, crc32, objfile->name))
     {
       xfree (basename);
       xfree (dir);
@@ -1469,7 +1487,7 @@ find_separate_debug_file (struct objfile
   strcat (debugfile, dir);
   strcat (debugfile, basename);
 
-  if (separate_debug_file_exists (debugfile, crc32))
+  if (separate_debug_file_exists (debugfile, crc32, objfile->name))
     {
       xfree (basename);
       xfree (dir);
@@ -1488,7 +1506,7 @@ find_separate_debug_file (struct objfile
       strcat (debugfile, "/");
       strcat (debugfile, basename);
 
-      if (separate_debug_file_exists (debugfile, crc32))
+      if (separate_debug_file_exists (debugfile, crc32, objfile->name))
 	{
 	  xfree (canon_name);
 	  xfree (basename);