Bump the C++ version from C++11 to C++17

This will allow the usage of more modern features in the future.

README.md

@@ -76,7 +76,7 @@ Windows build is not ready yet.
 
 ## Dependencies
 
-This library is written in C++ using the C++11 standards. It also uses Flex
+This library is written in C++ using the C++17 standards. It also uses Flex
 and Yacc to produce the “Sec Rules Language” parser. Other, mandatory dependencies include YAJL, as ModSecurity uses JSON for producing logs and its testing framework, libpcre (not yet mandatory) for processing regular expressions in SecRules, and libXML2 (not yet mandatory) which is used for parsing XML requests.
 
 All others dependencies are related to operators specified within SecRules or configuration directives and may not be required for compilation. A short list of such dependencies is as follows:

configure.ac

@@ -52,8 +52,8 @@ AC_PROG_MAKE_SET
 PKG_PROG_PKG_CONFIG
 
 
-# Check if the compiler is c++11 compatible.
+# Check if the compiler is c++17 compatible.
-# AX_CXX_COMPILE_STDCXX_11(,mandatory)
+# AX_CXX_COMPILE_STDCXX_17(,mandatory)
 
 # Check for libinjection
 if ! test -f "${srcdir}/others/libinjection/src/libinjection_html5.c"; then

examples/reading_logs_via_rule_message/Makefile.am

@@ -32,7 +32,7 @@ simple_request_LDFLAGS = \
 
 simple_request_CPPFLAGS = \
 	$(GLOBAL_CFLAGS) \
-	-std=c++11 \
+	-std=c++17 \
 	-I$(top_builddir)/headers \
 	-I$(top_builddir) \
 	-g \

examples/reading_logs_with_offset/Makefile.am

@@ -32,7 +32,7 @@ read_LDFLAGS = \
 
 read_CPPFLAGS = \
 	$(GLOBAL_CFLAGS) \
-	-std=c++11 \
+	-std=c++17 \
 	-I$(top_builddir)/headers \
 	-I$(top_builddir) \
 	-g \

examples/using_bodies_in_chunks/Makefile.am

@@ -33,7 +33,7 @@ simple_request_LDFLAGS = \
 
 simple_request_CPPFLAGS = \
 	$(GLOBAL_CFLAGS) \
-	-std=c++11 \
+	-std=c++17 \
 	-I$(top_builddir)/headers \
 	-I$(top_builddir) \
 	-g \

src/Makefile.am

@@ -311,7 +311,7 @@ libmodsecurity_la_CFLAGS =
 
 
 libmodsecurity_la_CPPFLAGS = \
-	-std=c++11 \
+	-std=c++17 \
 	-I.. \
 	-g \
 	-I../others \

src/parser/Makefile.am

@@ -11,11 +11,10 @@ libmodsec_parser_la_SOURCES = \
 	test.cc
 
 libmodsec_parser_la_CPPFLAGS = \
-	-std=c++11 \
+	-std=c++17 \
 	-I../.. \
 	-I../../headers \
 	-I../../others \
-	-std=c++11 \
 	-I.. \
 	-g \
 	-fPIC \

test/Makefile.am

@@ -70,7 +70,7 @@ unit_tests_LDFLAGS = \
 
 
 unit_tests_CPPFLAGS = \
-	-std=c++11 \
+	-std=c++17 \
 	-Icommon \
 	-I../ \
 	-g \
@@ -126,7 +126,7 @@ regression_tests_LDFLAGS = \
 
 
 regression_tests_CPPFLAGS = \
-	-std=c++11 \
+	-std=c++17 \
 	-Icommon \
 	-I../ \
 	-g \
@@ -179,7 +179,7 @@ rules_optimization_LDFLAGS = \
 	$(YAJL_LDFLAGS)
 
 rules_optimization_CPPFLAGS = \
-	-std=c++11 \
+	-std=c++17 \
 	-Icommon \
 	-I../ \
 	-g \

test/benchmark/Makefile.am

@@ -32,7 +32,7 @@ benchmark_LDFLAGS = \
 	$(LUA_LDFLAGS)
 
 benchmark_CPPFLAGS = \
-	-std=c++11 \
+	-std=c++17 \
 	-I$(top_builddir)/headers \
 	$(GLOBAL_CPPFLAGS) \
 	$(PCRE_CFLAGS) \

test/fuzzer/Makefile.am

@@ -30,7 +30,7 @@ afl_fuzzer_LDADD = \
 
 
 afl_fuzzer_CPPFLAGS = \
-	-std=c++11 \
+	-std=c++17 \
 	-Icommon \
 	-I../ \
 	-I../../ \

tools/rules-check/Makefile.am

@@ -28,7 +28,7 @@ modsec_rules_check_LDFLAGS = \
 	$(YAJL_LDFLAGS)
 
 modsec_rules_check_CPPFLAGS = \
-	-std=c++11 \
+	-std=c++17 \
 	-I$(top_builddir)/headers \
 	$(GLOBAL_CPPFLAGS) \
 	$(PCRE_CFLAGS) \