Enable all warnings for re2c

This helps noticing issues like GH-17204 and GH-17523 sooner.

Author: petk

configure.ac

@@ -148,7 +148,7 @@ PHP_RUNPATH_SWITCH
 
 dnl Checks for some support/generator progs.
 PHP_PROG_BISON([3.0.0])
-PHP_PROG_RE2C([1.0.3], [--no-generation-date])
+PHP_PROG_RE2C([1.0.3], [--no-generation-date -W])
 dnl Find installed PHP. Minimum supported version for gen_stub.php is PHP 7.4.
 PHP_PROG_PHP([7.4])
 

scripts/dev/genfiles

@@ -37,7 +37,7 @@ YACC=${YACC:-bison}
 YACC="$YACC -l"
 YFLAGS="-Wall"
 RE2C=${RE2C:-re2c}
-RE2C_FLAGS="--no-generation-date -i"
+RE2C_FLAGS="--no-generation-date -i -W"
 SED=${SED:-sed}
 MAKE=${MAKE:-make}
 

win32/build/confutils.js

@@ -3017,7 +3017,7 @@ function toolset_setup_project_tools()
 	}
 
 	var RE2C = PATH_PROG('re2c');
-	DEFINE('RE2C_FLAGS', '--no-generation-date');
+	DEFINE('RE2C_FLAGS', '--no-generation-date -W');
 	if (RE2C) {
 		var RE2CVERS = probe_binary(RE2C, "version");
 		STDOUT.WriteLine('  Detected re2c version ' + RE2CVERS);