[PATCH 5/5] Also look for debug files in gdb_sysroot

[Gary Benson <gbenson@redhat.com>]

This commit makes GDB look for separate debug files in gdb_sysroot if
not found in the currently searched locations.  This allows for easier
analysis of core files from foreign machines using the sysroot option.
The user creates or mounts a directory containing the necessary
binaries and debuginfo and then sets GDB's sysroot to that directory
before starting their debug session.

gdb/ChangeLog:

	* gdb/symfile.c (find_separate_debug_file): In debugdir loop,
	also try alternate directory prefixed with gdb_sysroot.
---
 gdb/ChangeLog |    6 ++++++
 gdb/symfile.c |   11 +++++++++++
 2 files changed, 17 insertions(+), 0 deletions(-)

diff --git a/gdb/symfile.c b/gdb/symfile.c
index 0cc940a..1cd99ea 100644
--- a/gdb/symfile.c
+++ b/gdb/symfile.c
@@ -1613,6 +1613,7 @@ find_separate_debug_file (const char *dir,
 
       if (altdir != NULL)
 	{
+	  /* Try in the alternate directory directly.  */
 	  debugfile = build_debug_file_name (no_prefix, debugdir,
 					     altdir, debuglink, NULL);
 	  if (separate_debug_file_exists (debugfile, crc32, objfile))
@@ -1621,6 +1622,16 @@ find_separate_debug_file (const char *dir,
 	      return debugfile;
 	    }
 	  xfree (debugfile);
+
+	  /* Try in the alternate directory in gdb_sysroot.  */
+	  debugfile = build_debug_file_name (gdb_sysroot, debugdir,
+					     altdir, debuglink, NULL);
+	  if (separate_debug_file_exists (debugfile, crc32, objfile))
+	    {
+	      do_cleanups (back_to);
+	      return debugfile;
+	    }
+	  xfree (debugfile);
 	}
     }
 
-- 
1.7.1