From c7bd01c62a08b81dc68f62f4fba1e23e3c06c62b Mon Sep 17 00:00:00 2001
From: heitbaum <rudi@heitbaum.com>
Date: Fri, 10 Sep 2021 00:28:16 +1000
Subject: [PATCH] yyerror: update to POSIX standard

To comply with the latest POSIX standard, in Yacc compatibility mode
(options `-y`/`--yacc`) Bison now generates prototypes for yyerror and
yylex.  In some situations, this is breaking compatibility: if the user
has already declared these functions but with some differences (e.g., to
declare them as static, or to use specific attributes), the generated
parser will fail to compile.  To disable these prototypes, #define yyerror
(to `yyerror`), and likewise for yylex.

refer: https://git.savannah.gnu.org/cgit/bison.git/tree/NEWS

GNU Bison 3.8
---
 lib/asn1/asn1parse.y | 1 +
 lib/com_err/parse.y  | 5 +++--
 lib/sl/slc-lex.l     | 2 +-
 lib/sl/slc.h         | 3 ++-
 4 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/lib/asn1/asn1parse.y b/lib/asn1/asn1parse.y
index 9d8b76f58..91b163a28 100644
--- a/lib/asn1/asn1parse.y
+++ b/lib/asn1/asn1parse.y
@@ -65,6 +65,7 @@ static void validate_object_set(IOSObjectSet *);
 static struct constraint_spec *new_constraint_spec(enum ctype);
 static Type *new_tag(int tagclass, int tagvalue, int tagenv, Type *oldtype);
 void yyerror (const char *);
+#define yyerror yyerror
 static struct objid *new_objid(const char *label, int value);
 static void add_oid_to_tail(struct objid *, struct objid *);
 static void fix_labels(Symbol *s);
diff --git a/lib/com_err/parse.y b/lib/com_err/parse.y
index 0c2e5084b..bcb9b0520 100644
--- a/lib/com_err/parse.y
+++ b/lib/com_err/parse.y
@@ -35,7 +35,8 @@
 #include "compile_et.h"
 #include "lex.h"
 
-void yyerror (char *s);
+void yyerror (const char *s);
+#define yyerror yyerror
 static long name2number(const char *str);
 
 extern char *yytext;
@@ -168,7 +169,7 @@ name2number(const char *str)
 }
 
 void
-yyerror (char *s)
+yyerror (const char *s)
 {
      _lex_error_message ("%s\n", s);
 }
diff --git a/lib/sl/slc-lex.l b/lib/sl/slc-lex.l
index 50965bccd..3a3730233 100644
--- a/lib/sl/slc-lex.l
+++ b/lib/sl/slc-lex.l
@@ -78,7 +78,7 @@ error_message (const char *format, ...)
 }
 
 void
-yyerror (char *s)
+yyerror (const char *s)
 {
     error_message("%s\n", s);
 }
diff --git a/lib/sl/slc.h b/lib/sl/slc.h
index 6e45ed2f1..e4dc2cba6 100644
--- a/lib/sl/slc.h
+++ b/lib/sl/slc.h
@@ -51,5 +51,6 @@ extern char *filename;
 extern int error_flag;
 void error_message (const char *format, ...);
 int yylex(void);
-void yyerror (char *s);
+void yyerror (const char *s);
+#define yyerror yyerror
 extern unsigned lineno;