* data/c.m4 (yydestruct, yysymprint):

[bison.git] / data / c.m4

diff --git a/data/c.m4 b/data/c.m4
index d8dc6bc4bc589775db0790b7bb91f21382630a45..604ad1386608be8333d74e2f9a092e6928682539 100644 (file)
--- a/data/c.m4
+++ b/data/c.m4
@@ -138,6 +138,15 @@ m4_define([b4_int_type_for],
 ## ------------------ ##
 
 
+# b4_error_verbose_if(IF-TRUE, IF-FALSE)
+# --------------------------------------
+# Expand IF-TRUE, if errors are verbose, IF-FALSE otherwise.
+m4_define([b4_error_verbose_if],
+[m4_if(b4_error_verbose, [1],
+       [$1],
+       [$2])])
+
+
 # b4_location_if(IF-TRUE, IF-FALSE)
 # ---------------------------------
 # Expand IF-TRUE, if locations are used, IF-FALSE otherwise.
@@ -376,9 +385,8 @@ m4_define_default([b4_yydestruct_generate],
     [[YYSTYPE *yyvaluep],    [yyvaluep]]b4_location_if([,
     [[YYLTYPE *yylocationp], [yylocationp]]]))[
 {
-  /* Pacify ``unused variable'' warnings.  */
-  (void) yyvaluep;
-]b4_location_if([  (void) yylocationp;
+  YYUSE (yyvaluep);
+]b4_location_if([  YYUSE (yylocationp);
 ])[
   if (!yymsg)
     yymsg = "Deleting";
@@ -411,9 +419,8 @@ m4_define_default([b4_yysymprint_generate],
     [[YYSTYPE *yyvaluep],    [yyvaluep]]b4_location_if([,
     [[YYLTYPE *yylocationp], [yylocationp]]]))
 {
-  /* Pacify ``unused variable'' warnings.  */
-  (void) yyvaluep;
-b4_location_if([  (void) yylocationp;
+  YYUSE (yyvaluep);
+b4_location_if([  YYUSE (yylocationp);
 ])dnl
 [
   if (yytype < YYNTOKENS)