Index: src/Makefile.am
===================================================================
--- src/Makefile.am	(revision 114936a6f7965d93d3969bca38c3a9dbbc748d3e)
+++ src/Makefile.am	(revision 3fcbdca128a1ff1d7a5c8fe6fb9005c9f448586f)
@@ -64,5 +64,5 @@
 endif
 
-AM_CXXFLAGS = @HOST_FLAGS@ -Wno-deprecated -Wall -Wextra -DDEBUG_ALL -I./Parser -I$(srcdir)/Parser -I$(srcdir)/include -DYY_NO_INPUT -O2 -g -std=c++14
+AM_CXXFLAGS = @HOST_FLAGS@ -Wno-deprecated -Wall -Wextra -DDEBUG_ALL -I./Parser -I$(srcdir)/Parser -I$(srcdir)/include -DYY_NO_INPUT -O3 -g -std=c++14
 AM_LDFLAGS  = @HOST_FLAGS@ -Xlinker -export-dynamic
 ARFLAGS     = cr
Index: src/Makefile.in
===================================================================
--- src/Makefile.in	(revision 114936a6f7965d93d3969bca38c3a9dbbc748d3e)
+++ src/Makefile.in	(revision 3fcbdca128a1ff1d7a5c8fe6fb9005c9f448586f)
@@ -651,5 +651,5 @@
 ___driver_cfa_cpp_SOURCES = $(SRC)
 ___driver_cfa_cpp_LDADD = -ldl			# yywrap
-AM_CXXFLAGS = @HOST_FLAGS@ -Wno-deprecated -Wall -Wextra -DDEBUG_ALL -I./Parser -I$(srcdir)/Parser -I$(srcdir)/include -DYY_NO_INPUT -O2 -g -std=c++14
+AM_CXXFLAGS = @HOST_FLAGS@ -Wno-deprecated -Wall -Wextra -DDEBUG_ALL -I./Parser -I$(srcdir)/Parser -I$(srcdir)/include -DYY_NO_INPUT -O3 -g -std=c++14
 AM_LDFLAGS = @HOST_FLAGS@ -Xlinker -export-dynamic
 ARFLAGS = cr