YYFAIL: deprecate.

[bison.git] / data / yacc.c

diff --git a/data/yacc.c b/data/yacc.c
index 11ebbf166d1e5883cd0d15ab40a743291febe0a9..5e7b55fc31e4af09232d323ca1e658db24c3d5ef 100644 (file)
--- a/data/yacc.c
+++ b/data/yacc.c
@@ -609,9 +609,18 @@ static const ]b4_int_type_for([b4_toknum])[ yytoknum[] =
 
 /* Like YYERROR except do call yyerror.  This remains here temporarily
    to ease the transition to the new meaning of YYERROR, for GCC.
-   Once GCC version 2 has supplanted version 1, this can go.  */
+   Once GCC version 2 has supplanted version 1, this can go.  However,
+   YYFAIL appears to be in use.  Nevertheless, it is formally deprecated
+   in Bison 2.4.2's NEWS entry, where a plan to phase it out is
+   discussed.  */
 
 #define YYFAIL         goto yyerrlab
+#if defined YYFAIL
+  /* This is here to suppress warnings from the GCC cpp's
+     -Wunused-macros.  Normally we don't worry about that warning, but
+     some users do, and we want to make it easy for users to remove
+     YYFAIL uses, which will produce warnings from Bison 2.5.  */
+#endif
 
 #define YYRECOVERING()  (!!yyerrstatus)