Description:
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Compiling pdo_mysql in PHP 5.5. Beta 4 gives these warnings:

/home/cjones/Desktop/php-5.5.0beta4/ext/pdo_mysql/pdo_mysql.c: In function 
‘zm_deactivate_pdo_mysql’:
/home/cjones/Desktop/php-5.5.0beta4/ext/pdo_mysql/pdo_mysql.c:188:2: warning: 
variable ‘dbg_skip_trace’ set but not used [-Wunused-but-set-variable]

and

/home/cjones/Desktop/php-5.5.0beta4/ext/pdo_mysql/mysql_driver.c: In function 
‘pdo_mysql_last_insert_id’:
/home/cjones/Desktop/php-5.5.0beta4/ext/pdo_mysql/mysql_driver.c:295:2: warning: 
variable ‘dbg_skip_trace’ set but not used [-Wunused-but-set-variable]

and

/home/cjones/Desktop/php-5.5.0beta4/ext/pdo_mysql/mysql_statement.c: In function 
‘pdo_mysql_fill_stmt_from_result’:
/home/cjones/Desktop/php-5.5.0beta4/ext/pdo_mysql/mysql_statement.c:133:2: 
warning: variable ‘dbg_skip_trace’ set but not used [-Wunused-but-set-variable]
/home/cjones/Desktop/php-5.5.0beta4/ext/pdo_mysql/mysql_statement.c: In function 
‘pdo_mysql_stmt_execute_prepared_mysqlnd’:
/home/cjones/Desktop/php-5.5.0beta4/ext/pdo_mysql/mysql_statement.c:279:2: 
warning: variable ‘dbg_skip_trace’ set but not used [-Wunused-but-set-variable]