Avoid warnings while generating the parser

configure.ac

@@ -141,6 +141,7 @@ LT_INIT([dlopen])
 # Identify platform
 AC_CANONICAL_HOST
 
+CUSTOM_YFLAGS=""
 case $host in
   *-*-aix*)
     echo "Checking platform... Identified as AIX"
@@ -161,6 +162,7 @@ case $host in
     echo "Checking platform... Identified as Linux"
     AC_DEFINE([LINUX], [1], [Define if the operating system is LINUX])
     PLATFORM="Linux"
+    CUSTOM_YFLAGS="-d -Wno-yacc"
     ;;
   *-*-solaris*)
     echo "Checking platform... Identified as Solaris"
@@ -207,6 +209,8 @@ esac
 MSC_BASE_DIR=`pwd`
 AC_SUBST([MSC_BASE_DIR])
 
+AC_SUBST([CUSTOM_YFLAGS])
+
 MSC_VERSION_INFO=msc_version_info
 AC_SUBST([MSC_VERSION_INFO])
 

src/parser/Makefile.am

@@ -1,6 +1,8 @@
 
 noinst_LTLIBRARIES = libmodsec_parser.la
 
+AM_YFLAGS = $(CUSTOM_YFLAGS)
+
 BUILT_SOURCES = \
 	seclang-parser.cc \
 	test.cc

src/parser/seclang-parser.yy

@@ -1,7 +1,7 @@
 %skeleton "lalr1.cc" /* -*- C++ -*- */
 %require "3.0.2"
 %defines
-%define parser_class_name {seclang_parser}
+%define api.parser.class {seclang_parser}
 %define api.token.constructor
 %define api.value.type variant
 //%define api.namespace {modsecurity::yy}