enabling temporary build directory for blackbox multiple instances

runtime/simx/Makefile

@@ -1,5 +1,5 @@
 XLEN ?= 32
-
+DESTDIR ?= $(CURDIR)
 SIMX_DIR = ../../sim/simx
 
 CXXFLAGS += -std=c++11 -Wall -Wextra -Wfatal-errors
@@ -10,7 +10,7 @@ CXXFLAGS += -DDUMP_PERF_STATS
 CXXFLAGS += -DXLEN_$(XLEN)
 
 LDFLAGS += -shared -pthread
-LDFLAGS += -L. -lsimx
+LDFLAGS += -L$(DESTDIR) -lsimx
 
 SRCS = vortex.cpp ../common/utils.cpp
 
@@ -23,12 +23,12 @@ endif
 
 PROJECT = libvortex.so
 
-all: $(PROJECT)
+all: $(DESTDIR)/$(PROJECT)
 
-$(PROJECT): $(SRCS)
-	DESTDIR=../../runtime/simx $(MAKE) -C $(SIMX_DIR) ../../runtime/simx/libsimx.so
+$(DESTDIR)/$(PROJECT): $(SRCS)
+	DESTDIR=$(DESTDIR) $(MAKE) -C $(SIMX_DIR) $(DESTDIR)/libsimx.so
 	$(CXX) $(CXXFLAGS) $^ $(LDFLAGS) -o $@
 
 clean:
-	DESTDIR=../../runtime/simx $(MAKE) -C $(SIMX_DIR) clean
-	rm -rf libsimx.so $(PROJECT) *.o
+	DESTDIR=$(DESTDIR) $(MAKE) -C $(SIMX_DIR) clean
+	rm -rf $(DESTDIR)/$(PROJECT) *.o