[PATCH] gcc/file-prefix-map: Fix NULL filename handling

[Richard Purdie via Gcc-patches]

e5c15eb183f17e806ad6b58c9497321ded87866f introduced a regression as
some ada tests end up passing NULL as the filename to remap_filename().
Handle this as before to fix the tests.

gcc/ChangeLog:

* file-prefix-map.cc (remap_filename): Handle NULL filenames.

Signed-off-by: Richard Purdie <richard.pur...@linuxfoundation.org>
---
 gcc/file-prefix-map.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gcc/file-prefix-map.cc b/gcc/file-prefix-map.cc
index 439586bd2b5..40b10edcf92 100644
--- a/gcc/file-prefix-map.cc
+++ b/gcc/file-prefix-map.cc
@@ -73,7 +73,7 @@ remap_filename (file_prefix_map *maps, const char *filename)
   char *realname;
   size_t name_len;
 
-  if (lbasename (filename) == filename)
+  if (!filename || lbasename (filename) == filename)
     return filename;
 
   realname = lrealpath (filename);
-- 
2.34.1