Enhance gdb.lookup_objfile so that it works with a symlinked binary.

gdb/Changelog:

	* objfiles.c (objfile_filename): New function.
	* objfiles.h (objfile_filename): Declare it.
	(objfile_name): Add function comment.
	* python/py-objfile.c (objfpy_lookup_objfile_by_name): Try both the
	bfd file name (which may be realpath'd), and the original name.

gdb/testsuite/ChangeLog:

	* gdb.python/py-objfile.exp: Test gdb.lookup_objfile on symlinked
	binary.

1 files changed, 9 insertions, 0 deletions

diff --git a/gdb/objfiles.h b/gdb/objfiles.h
index 8782797..a0dc69b 100644
--- a/gdb/objfiles.h
+++ b/gdb/objfiles.h
@@ -699,8 +699,17 @@ extern void default_iterate_over_objfiles_in_search_order
 
 void set_objfile_per_bfd (struct objfile *obj);
 
+/* Return canonical name for OBJFILE.
+   This is the real file name if the file has been opened.
+   Otherwise it is the original name supplied by the user.  */
+
 const char *objfile_name (const struct objfile *objfile);
 
+/* Return the (real) file name of OBJFILE if the file has been opened,
+   otherwise return NULL.  */
+
+const char *objfile_filename (const struct objfile *objfile);
+
 /* Return the name to print for OBJFILE in debugging messages.  */
 
 extern const char *objfile_debug_name (const struct objfile *objfile);