Reset front end trees before they make it into the middle end (PR middle-end/97172).

gcc/ChangeLog:

	PR middle-end/97172
	* attribs.c (attr_access::free_lang_data): Define new function.
	* attribs.h (attr_access::free_lang_data): Declare new function.

gcc/c/ChangeLog:

	PR middle-end/97172
	* c-decl.c (free_attr_access_data): New function.
	(c_parse_final_cleanups): Call free_attr_access_data.

gcc/testsuite/ChangeLog:

	PR middle-end/97172
	* gcc.dg/pr97172.c: New test.

1 files changed, 24 insertions, 0 deletions

diff --git a/gcc/c/c-decl.c b/gcc/c/c-decl.c
index 4ba9477..be95643 100644
--- a/gcc/c/c-decl.c
+++ b/gcc/c/c-decl.c
@@ -12146,6 +12146,27 @@ collect_source_refs (void)
       collect_source_ref (DECL_SOURCE_FILE (decl));
 }
 
+/* Free attribute access data that are not needed by the middle end. */
+
+static void
+free_attr_access_data ()
+{
+  struct cgraph_node *n;
+
+  /* Iterate over all functions declared in the translation unit.  */
+  FOR_EACH_FUNCTION (n)
+    {
+      tree fntype = TREE_TYPE (n->decl);
+      if (!fntype)
+	continue;
+      tree attrs = TYPE_ATTRIBUTES (fntype);
+      if (!attrs)
+	continue;
+
+      attr_access::free_lang_data (attrs);
+    }
+}
+
 /* Perform any final parser cleanups and generate initial debugging
    information.  */
 
@@ -12190,6 +12211,9 @@ c_parse_final_cleanups (void)
     c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t)));
   c_write_global_declarations_1 (BLOCK_VARS (ext_block));
 
+  if (!in_lto_p)
+    free_attr_access_data ();
+
   timevar_stop (TV_PHASE_DEFERRED);
   timevar_start (TV_PHASE_PARSING);