Generated code fails with -ansi

[t-bltg]

My swig build fails with the latest bison version 3.6. The generated code fails to compile with -ansi compiler flag.

The issue is with the c++ style comment here https://github.com/akimd/bison/blob/master/src/parse-gram.c#L2708 (also in some other locations: data/skeletons/yacc.c, ...)

A fix would be:

--- src/parse-gram.c  2020-05-09 11:07:53.483627254 +0000
+++ src/parse-gram.c  2020-05-09 11:08:05.619952863 +0000
@@ -2705,7 +2705,7 @@
 yyerrlab1:
   yyerrstatus = 3;      /* Each real token shifted decrements this.  */
 
-  // Pop stack until we find a state that shifts the error token.
+  /* Pop stack until we find a state that shifts the error token. */
   for (;;)
     {
       yyn = yypact[yystate];

--- data/skeletons/yacc.c  2020-05-09 11:20:47.180538119 +0000
+++ data/skeletons/yacc.c  2020-05-09 11:21:03.464980276 +0000
@@ -1979,7 +1979,7 @@
 yyerrlab1:
   yyerrstatus = 3;      /* Each real token shifted decrements this.  */
 
-  // Pop stack until we find a state that shifts the error token.
+  /* Pop stack until we find a state that shifts the error token. */
   for (;;)
     {
       yyn = yypact[yystate];

Thanks.

[akimd]

Bummer. Thanks for this report. I don't understand why this was not caught by our CI.