From 107ad28350e76f40d6e65ceac4e45cbf8cc3dc75 Mon Sep 17 00:00:00 2001
From: Nikita Popov <nikita.ppv@gmail.com>
Date: Thu, 28 Jul 2022 22:13:57 +0200
Subject: [PATCH] Suppress unused-but-set-variable warning in parsers

This is very ugly: Bison provides a yynerrs variable, which is
usually not actually used, but also not annotated with
YY_MAYBE_UNUSED. Suppress this warning by adding a (void)yynerrs
into the top-level reduction action. The alternative would be to
disable the warning for these generated files.
---
 Zend/zend_ini_parser.y      | 2 +-
 Zend/zend_language_parser.y | 2 +-
 ext/json/json_parser.y      | 1 +
 sapi/phpdbg/phpdbg_parser.y | 2 +-
 4 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/Zend/zend_ini_parser.y b/Zend/zend_ini_parser.y
index 7eb37535207..0091dbbfea8 100644
--- a/Zend/zend_ini_parser.y
+++ b/Zend/zend_ini_parser.y
@@ -308,7 +308,7 @@ static void zval_ini_dtor(zval *zv)
 
 statement_list:
 		statement_list statement
-	|	%empty
+	|	%empty { (void) ini_nerrs; }
 ;
 
 statement:
diff --git a/Zend/zend_language_parser.y b/Zend/zend_language_parser.y
index 3ce6a38d0d4..5dcda82a366 100644
--- a/Zend/zend_language_parser.y
+++ b/Zend/zend_language_parser.y
@@ -292,7 +292,7 @@ static YYSIZE_T zend_yytnamerr(char*, const char*);
 %% /* Rules */
 
 start:
-	top_statement_list	{ CG(ast) = $1; }
+	top_statement_list	{ CG(ast) = $1; (void) zendnerrs; }
 ;
 
 reserved_non_modifiers:
diff --git a/ext/json/json_parser.y b/ext/json/json_parser.y
index 862b1bc0ab7..90ff0a7c758 100644
--- a/ext/json/json_parser.y
+++ b/ext/json/json_parser.y
@@ -80,6 +80,7 @@ start:
 			{
 				ZVAL_COPY_VALUE(&$$, &$1);
 				ZVAL_COPY_VALUE(parser->return_value, &$1);
+				(void) php_json_yynerrs;
 				YYACCEPT;
 			}
 ;
diff --git a/sapi/phpdbg/phpdbg_parser.y b/sapi/phpdbg/phpdbg_parser.y
index 3a6ad9833ae..50cb93f05f6 100644
--- a/sapi/phpdbg/phpdbg_parser.y
+++ b/sapi/phpdbg/phpdbg_parser.y
@@ -66,7 +66,7 @@ ZEND_EXTERN_MODULE_GLOBALS(phpdbg)
 input
 	: command { $$ = $1; }
 	| input T_SEPARATOR command { phpdbg_stack_separate($1.top); $$ = $3; }
-	| %empty
+	| %empty { (void) phpdbg_nerrs; }
 	;
 
 command