re PR c/15007 (crash when including precompiled header with -include)

	PR 15007
	* c-decl.c (current_file_decl): Rename to all_translation_units,
	adjust comment.
	(pop_scope): If popping file_scope, construct a
	TRANSLATION_UNIT_DECL and make it the context of all the
	symbols in the scope.
	(push_file_scope): Don't construct a TRANSLATION_UNIT_DECL here.
	(pushdecl): Clarify comment.  Do not set DECL_CONTEXT of
	anything to current_file_decl.
	(pushdecl_top_level): Likewise.
	(store_parm_decls_newstyle): Adjust check for nested function.
	(c_write_global_declarations): Update for renamed variable.

From-SVN: r81655

1 files changed, 21 insertions, 17 deletions

diff --git a/gcc/c-decl.c b/gcc/c-decl.c
index ecf1198..3889726 100644
--- a/gcc/c-decl.c
+++ b/gcc/c-decl.c
@@ -108,9 +108,11 @@ static GTY(()) tree c_scope_stmt_stack;
 int c_in_iteration_stmt;
 int c_in_case_stmt;
 
-/* A DECL for the current file-scope context.  */
+/* Linked list of TRANSLATION_UNIT_DECLS for the translation units
+   included in this invocation.  Note that the current translation
+   unit is not included in this list.  */
 
-static GTY(()) tree current_file_decl;
+static GTY(()) tree all_translation_units;
 
 /* A list of decls to be made automatically visible in each file scope.  */
 static GTY(()) tree visible_builtins;
@@ -649,7 +651,12 @@ pop_scope (void)
   if (scope->function_body)
     context = current_function_decl;
   else if (scope == file_scope)
-    context = current_file_decl;
+    {
+      tree file_decl = build_decl (TRANSLATION_UNIT_DECL, 0, 0);
+      TREE_CHAIN (file_decl) = all_translation_units;
+      all_translation_units = file_decl;
+      context = file_decl;
+    }
   else
     context = block;
 
@@ -736,6 +743,9 @@ pop_scope (void)
 	      TREE_CHAIN (p) = BLOCK_VARS (block);
 	      BLOCK_VARS (block) = p;
 	    }
+	  /* If this is the file scope, must set DECL_CONTEXT on these.  */
+	  if (!C_DECL_IN_EXTERNAL_SCOPE (p) && scope == file_scope)
+	    DECL_CONTEXT (p) = context;
 
 	  /* Fall through.  */
 	  /* Parameters go in DECL_ARGUMENTS, not BLOCK_VARS, and have
@@ -795,9 +805,6 @@ void
 push_file_scope (void)
 {
   tree decl;
-  tree file_decl = build_decl (TRANSLATION_UNIT_DECL, 0, 0);
-  TREE_CHAIN (file_decl) = current_file_decl;
-  current_file_decl = file_decl;
 
   push_scope ();
   file_scope = current_scope;
@@ -1796,14 +1803,12 @@ pushdecl (tree x)
   if (TREE_CODE (x) == FUNCTION_DECL && ! DECL_LANG_SPECIFIC (x))
     DECL_LANG_SPECIFIC (x) = ggc_alloc_cleared (sizeof (struct lang_decl));
 
-  /* A local extern declaration for a function doesn't constitute nesting.
-     A local auto declaration does, since it's a forward decl
-     for a nested function coming later.  */
-  if (current_function_decl == NULL
-      || ((TREE_CODE (x) == FUNCTION_DECL || TREE_CODE (x) == VAR_DECL)
-	  && DECL_INITIAL (x) == 0 && DECL_EXTERNAL (x)))
-    DECL_CONTEXT (x) = current_file_decl;
-  else
+  /* Must set DECL_CONTEXT for everything not at file scope or
+     DECL_FILE_SCOPE_P won't work.  Local externs don't count
+     unless they have initializers (which generate code).  */
+  if (current_function_decl
+      && ((TREE_CODE (x) != FUNCTION_DECL && TREE_CODE (x) != VAR_DECL)
+	  || DECL_INITIAL (x) || !DECL_EXTERNAL (x)))
     DECL_CONTEXT (x) = current_function_decl;
 
   /* Anonymous decls are just inserted in the scope.  */
@@ -1927,7 +1932,6 @@ pushdecl_top_level (tree x)
   if (I_SYMBOL_BINDING (name))
     abort ();
 
-  DECL_CONTEXT (x) = current_file_decl;
   if (DECL_EXTERNAL (x) || TREE_PUBLIC (x))
     {
       C_DECL_IN_EXTERNAL_SCOPE (x) = 1;
@@ -5825,7 +5829,7 @@ store_parm_decls_newstyle (tree fndecl, tree arg_info)
      (this happens when a function definition has just an ellipsis in
      its parameter list).  */
   else if (warn_traditional && !in_system_header
-	   && DECL_CONTEXT (fndecl) == current_file_decl
+	   && !current_scope->outer_function
 	   && ARG_INFO_TYPES (arg_info) != error_mark_node)
     warning ("%Jtraditional C rejects ISO C style function definitions",
 	     fndecl);
@@ -6625,7 +6629,7 @@ c_write_global_declarations (void)
     return;
 
   /* Process all file scopes in this compilation.  */
-  for (t = current_file_decl; t; t = TREE_CHAIN (t))
+  for (t = all_translation_units; t; t = TREE_CHAIN (t))
     c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t)));
 
   /* Now do the same for the externals scope.  */