check for 64-bit compiler

Makefile.linux

@@ -2,6 +2,9 @@ CC = g++
 CFLAGS = -g -Wall
 CXXVER := $(shell ${CC} -dumpversion)
 
+FGREP = fgrep
+IS_64 := $(shell $(CXX) -dumpmachine 2>&1 | $(FGREP) -c "64")
+
 ifeq ($(shell expr match ${CXXVER} "4\.[0-9][0-9]"),4) # >= 4.10
 CFLAGS += -std=c++11
 else ifeq ($(shell expr match ${CXXVER} "4\.[7-9]"),3) # >= 4.7
@@ -18,8 +21,11 @@ INCFLAGS =
 LDFLAGS = -lcryptopp -lboost_system -lboost_date_time -lboost_filesystem -lboost_regex -lboost_program_options -lpthread
 LIBS =
 
+
+ifeq ($(IS_64),1)
 #check if AES-NI is supported by CPU
 ifneq ($(shell grep -c aes /proc/cpuinfo),0)
 	CPU_FLAGS = -maes -DAESNI
 endif
+endif