Issue #15284 has been updated by yui-knk (Kaneko Yuichiro).


JFYI: It seems this commit on bison http://git.savannah.gnu.org/cgit/bison.git/commit/?id=e7b709ab0b00244f87f53e60bc2d0ad6b32f0c23 changed yyoutput to yyo. And this change on bison has been introduced to version 3.2.

Ref: http://lists.gnu.org/archive/html/bison-patches/2018-10/msg00083.html

----------------------------------------
Bug #15284: Unintentional warnings with node.h
https://bugs.ruby-lang.org/issues/15284#change-74832

* Author: hsbt (Hiroshi SHIBATA)
* Status: Closed
* Priority: Normal
* Assignee: nobu (Nobuyoshi Nakada)
* Target version: 
* ruby -v: 
* Backport: 2.3: UNKNOWN, 2.4: UNKNOWN, 2.5: UNKNOWN
----------------------------------------
Recently, I got the following warnings with build time.

```
parse.c:4720:14: warning: incompatible pointer types passing 'FILE *' (aka 'struct __sFILE *') to parameter of type 'struct parser_params *' [-Wincompatible-pointer-types]
  YYFPRINTF (yyo, "%s %s (",
             ^~~
../node.h:437:57: note: passing argument to parameter 'parser' here
PRINTF_ARGS(void rb_parser_printf(struct parser_params *parser, const char *fmt, ...), 2, 3);
                                                        ^
parse.c:4724:14: warning: incompatible pointer types passing 'FILE *' (aka 'struct __sFILE *') to parameter of type 'struct parser_params *' [-Wincompatible-pointer-types]
  YYFPRINTF (yyo, ": ");
             ^~~
../node.h:437:57: note: passing argument to parameter 'parser' here
PRINTF_ARGS(void rb_parser_printf(struct parser_params *parser, const char *fmt, ...), 2, 3);
                                                        ^
parse.c:4726:14: warning: incompatible pointer types passing 'FILE *' (aka 'struct __sFILE *') to parameter of type 'struct parser_params *' [-Wincompatible-pointer-types]
  YYFPRINTF (yyo, ")");
             ^~~
../node.h:437:57: note: passing argument to parameter 'parser' here
PRINTF_ARGS(void rb_parser_printf(struct parser_params *parser, const char *fmt, ...), 2, 3);
```

Maybe, It caused by bison version.

```
> bison --version
bison (GNU Bison) 3.2
```





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