PR c/69911 Check main_input_filename and DECL_SOURCE_FILE are not NULL.

DECL_SOURCE_FILE can be NULL (for example when DECL_ARTIFICIAL).
So make sure to check before comparing against main_input_filename.

gcc/ChangeLog

	PR c/69911
	* cgraphunit.c (check_global_declaration): Check main_input_filename
	and DECL_SOURCE_FILE are not NULL.

Co-Authored-By: Jakub Jelinek <jakub@redhat.com>
From-SVN: r233627

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index e416c46..2c77b39 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,10 @@
+2016-02-23  Mark Wielaard  <mjw@redhat.com>
+           Jakub Jelinek  <jakub@redhat.com>
+
+       PR c/69911
+       * cgraphunit.c (check_global_declaration): Check main_input_filename
+       and DECL_SOURCE_FILE are not NULL.
+
 2016-02-23  Martin Jambor  <mjambor@suse.cz>
 
        PR tree-optimization/69666

diff --git a/gcc/cgraphunit.c b/gcc/cgraphunit.c
index 27a073a..8b3fddc 100644 (file)
--- a/gcc/cgraphunit.c
+++ b/gcc/cgraphunit.c
@@ -917,6 +917,7 @@ walk_polymorphic_call_targets (hash_set<void *> *reachable_call_targets,
 static void
 check_global_declaration (symtab_node *snode)
 {
+  const char *decl_file;
   tree decl = snode->decl;
 
   /* Warn about any function declared static but not defined.  We don't
@@ -944,8 +945,10 @@ check_global_declaration (symtab_node *snode)
        || (((warn_unused_variable && ! TREE_READONLY (decl))
            || (warn_unused_const_variable > 0 && TREE_READONLY (decl)
                && (warn_unused_const_variable == 2
-                   || filename_cmp (main_input_filename,
-                                    DECL_SOURCE_FILE (decl)) == 0)))
+                   || (main_input_filename != NULL
+                       && (decl_file = DECL_SOURCE_FILE (decl)) != NULL
+                       && filename_cmp (main_input_filename,
+                                        decl_file) == 0))))
           && TREE_CODE (decl) == VAR_DECL))
       && ! DECL_IN_SYSTEM_HEADER (decl)
       && ! snode->referred_to_p (/*include_self=*/false)