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

[bison.git] / data / glr.c

diff --git a/data/glr.c b/data/glr.c
index 848579b68d47f3dba84d30b86c826ed092e07289..877e400960ac69f36396dc32a89a3f0415938527 100644 (file)
--- a/data/glr.c
+++ b/data/glr.c
@@ -234,6 +234,9 @@ b4_syncline([@oline@], [@ofile@])
 # endif
 #endif
 
+/* Suppress unused-variable warnings by "using" E.  */
+#define YYUSE(e) do {;} while (/*CONSTCOND*/ yyfalse && (e))
+
 #ifndef YYFREE
 # define YYFREE free
 #endif
@@ -470,7 +473,7 @@ static const ]b4_int_type_for([b4_stos])[ yystos[] =
          (Current).first_column = (Current).last_column =              \
            YYRHSLOC (Rhs, 0).last_column;                              \
        }                                                               \
-    while (0)
+    while (/*CONSTCOND*/ 0)
 
 /* YY_LOCATION_PRINT -- Print the location on the stream.
    This macro was not mandated originally: define only if we know
@@ -515,7 +518,7 @@ typedef enum { yyok, yyaccept, yyabort, yyerr } YYRESULTTAG;
 
 #define YYCHK(YYE)                                                          \
    do { YYRESULTTAG yyflag = YYE; if (yyflag != yyok) return yyflag; }      \
-   while (0)
+   while (/*CONSTCOND*/ 0)
 
 #if YYDEBUG
 
@@ -527,7 +530,7 @@ typedef enum { yyok, yyaccept, yyabort, yyerr } YYRESULTTAG;
 do {                                           \
   if (yydebug)                                 \
     YYFPRINTF Args;                            \
-} while (0)
+} while (/*CONSTCOND*/ 0)
 
 ]b4_yysymprint_generate([b4_c_ansi_function_def])[
 
@@ -540,7 +543,7 @@ do {                                                                \
                   Type, Value]b4_location_if([, Location])[);  \
       YYFPRINTF (stderr, "\n");                                        \
     }                                                          \
-} while (0)
+} while (/*CONSTCOND*/ 0)
 
 /* Nonzero means print parse trace.  It is left uninitialized so that
    multiple parsers can coexist.  */
@@ -877,9 +880,8 @@ b4_syncline([@oline@], [@ofile@])
 static void
 yyuserMerge (int yyn, YYSTYPE* yy0, YYSTYPE* yy1)
 {
-  /* Suppress unused-variable warnings.  */
-  yy0 = yy0;
-  yy1 = yy1;
+  YYUSE (yy0);
+  YYUSE (yy1);
 
   switch (yyn)
     {
@@ -1306,7 +1308,7 @@ yydoAction (yyGLRStack* yystack, size_t yyk, yyRuleNum yyrule,
 do {                                   \
   if (yydebug)                         \
     yy_reduce_print (K, Rule);         \
-} while (0)
+} while (/*CONSTCOND*/ 0)
 
 /*----------------------------------------------------------.
 | Report that the RULE is going to be reduced on stack #K.  |
@@ -1621,9 +1623,8 @@ static void
 yyreportAmbiguity (yySemanticOption* yyx0, yySemanticOption* yyx1,
                   yyGLRStack* yystack]b4_pure_formals[)
 {
-  /* Suppress unused-variable warnings.  */
-  yyx0 = yyx0;
-  yyx1 = yyx1;
+  YYUSE (yyx0);
+  YYUSE (yyx1);
 
 #if YYDEBUG
   YYFPRINTF (stderr, "Ambiguity detected.\n");
@@ -1836,9 +1837,8 @@ static void
 yyreportSyntaxError (yyGLRStack* yystack,
                     YYSTYPE* yylvalp, YYLTYPE* yyllocp]b4_user_formals[)
 {
-  /* Suppress unused-variable warnings.  */
-  yylvalp = yylvalp;
-  yyllocp = yyllocp;
+  YYUSE (yylvalp);
+  YYUSE (yyllocp);
 
   if (yystack->yyerrState == 0)
     {
@@ -2046,7 +2046,7 @@ yyrecoverSyntaxError (yyGLRStack* yystack,
     default:                                                                \
       goto yybuglab;                                                        \
     }                                                                       \
-  } while (0)
+  } while (/*CONSTCOND*/ 0)
 
 
 /*----------.