diff --git a/NEWS b/NEWS
index 895f55db..8c5bf593 100644
--- a/NEWS
+++ b/NEWS
@@ -2,6 +2,17 @@ GNU Bison NEWS
 
 * Noteworthy changes in release ?.? (????-??-??) [?]
 
+  We consider compiler warnings about Bison generated parsers to be bugs.
+  Rather than working around them in your own project, please consider
+  reporting them to us.
+
+** Bug fixes
+
+  Warnings about uninitialized yylval and/or yylloc for push parsers with a
+  pure interface have been fixed for GCC 4.0 up to 4.8, and Clang 2.9 to
+  3.2.
+
+  Other issues in the test suite have been addressed.
 
 * Noteworthy changes in release 2.6.4 (2012-10-23) [stable]
 
diff --git a/data/c.m4 b/data/c.m4
index 561900af..136b46e1 100644
--- a/data/c.m4
+++ b/data/c.m4
@@ -643,3 +643,19 @@ m4_define([b4_yylloc_default_define],
     while (YYID (0))
 #endif
 ]])
+
+# b4_yyloc_default_define
+# ------------------------
+# Define yyloc_default, which can be used to initialize location
+# variables.
+m4_define([b4_yyloc_default_define],
+[[static YYLTYPE yyloc_default
+# if defined ]b4_api_PREFIX[LTYPE_IS_TRIVIAL && ]b4_api_PREFIX[LTYPE_IS_TRIVIAL
+  = { ]m4_join([, ],
+               m4_defn([b4_location_initial_line]),
+               m4_defn([b4_location_initial_column]),
+               m4_defn([b4_location_initial_line]),
+               m4_defn([b4_location_initial_column]))[ }
+# endif
+  ;]dnl
+])
diff --git a/data/glr.c b/data/glr.c
index 79d6ffd0..89a76e3e 100644
--- a/data/glr.c
+++ b/data/glr.c
@@ -223,11 +223,11 @@ b4_percent_code_get([[top]])[
 #endif
 
 /* Default (constant) value used for initialization for null
-   right-hand sides.  Unlike the standard yacc.c template,
-   here we set the default value of $$ to a zeroed-out value.
-   Since the default value is undefined, this behavior is
-   technically correct.  */
-static YYSTYPE yyval_default;
+   right-hand sides.  Unlike the standard yacc.c template, here we set
+   the default value of $$ to a zeroed-out value.  Since the default
+   value is undefined, this behavior is technically correct.  */
+static YYSTYPE yyval_default;]b4_locations_if([
+b4_yyloc_default_define])[
 
 /* Copy the second part of user declarations.  */
 ]b4_user_post_prologue
@@ -2295,14 +2295,9 @@ yyrecoverSyntaxError (yyGLRStack* yystackp]b4_user_formals[)
   YYDPRINTF ((stderr, "Starting parse\n"));
 
   yychar = YYEMPTY;
-  yylval = yyval_default;
-]b4_locations_if([
-#if defined ]b4_api_PREFIX[LTYPE_IS_TRIVIAL && ]b4_api_PREFIX[LTYPE_IS_TRIVIAL
-  yylloc.first_line   = yylloc.last_line   = ]b4_location_initial_line[;
-  yylloc.first_column = yylloc.last_column = ]b4_location_initial_column[;
-#endif
-])
-m4_ifdef([b4_initial_action], [
+  yylval = yyval_default;]b4_locations_if([
+  yylloc = yyloc_default;])[
+]m4_ifdef([b4_initial_action], [
 b4_dollar_pushdef([yylval], [], [yylloc])dnl
 /* User initialization code.  */
 b4_user_initial_action
diff --git a/data/yacc.c b/data/yacc.c
index 3b111d12..5d68bd4e 100644
--- a/data/yacc.c
+++ b/data/yacc.c
@@ -181,22 +181,23 @@ int yychar;
 #else
 /* Default value used for initialization, for pacifying older GCCs
    or non-GCC compilers.  */
-static YYSTYPE yyval_default;
-# define YYLVAL_INITIALIZE() (yylval = yyval_default)
+static YYSTYPE yyval_default;]b4_locations_if([
+b4_yyloc_default_define])[
+# define YY_INITIAL_VALUE(Value) = Value
 #endif]])[
-#ifndef YYLVAL_INITIALIZE
-# define YYLVAL_INITIALIZE()
-#endif
 #ifndef YY_IGNORE_MAYBE_UNINITIALIZED_BEGIN
 # define YY_IGNORE_MAYBE_UNINITIALIZED_BEGIN
 # define YY_IGNORE_MAYBE_UNINITIALIZED_END
 #endif
+#ifndef YY_INITIAL_VALUE
+# define YY_INITIAL_VALUE(Value) /* Nothing. */
+#endif
 
 /* The semantic value of the lookahead symbol.  */
-YYSTYPE yylval;]b4_locations_if([[
+YYSTYPE yylval YY_INITIAL_VALUE(yyval_default);]b4_locations_if([[
 
 /* Location data for the lookahead symbol.  */
-YYLTYPE yylloc;]])b4_pure_if([], [[
+YYLTYPE yylloc YY_INITIAL_VALUE(yyloc_default);]])b4_pure_if([], [[
 
 /* Number of syntax errors so far.  */
 int yynerrs;]])])
@@ -1581,14 +1582,7 @@ b4_c_function_def([[yyparse]], [[int]], b4_parse_param)[
   yyssp = yyss;
   yyvsp = yyvs;]b4_locations_if([[
   yylsp = yyls;]])[
-
-  YYLVAL_INITIALIZE ();]b4_locations_if([[
-#if defined ]b4_api_PREFIX[LTYPE_IS_TRIVIAL && ]b4_api_PREFIX[LTYPE_IS_TRIVIAL
-  /* Initialize the default location before parsing starts.  */
-  yylloc.first_line   = yylloc.last_line   = ]b4_location_initial_line[;
-  yylloc.first_column = yylloc.last_column = ]b4_location_initial_column[;
-#endif]])
-m4_ifdef([b4_initial_action],[
+]m4_ifdef([b4_initial_action],[
 b4_dollar_pushdef([m4_define([b4_dollar_dollar_used])yylval], [],
                   [m4_define([b4_at_dollar_used])yylloc])dnl
 /* User initialization code.  */