change to clang++. g++ seems to haw a bug related to bitfields

interpreter/Makefile

 TARGET = main
 LIBS =
-CC = g++
-CFLAGS = -O3 -Wno-write-strings # -g -pg -fstack-usage 
+CC = clang++
+CFLAGS = -O3 -x c++ -Wno-write-strings # -g -pg -fstack-usage 
 
 .PHONY: default all clean