Don't hardcode paths to Z3. Makefile uses Z3 system headers in some places and local build in others

[santoshn]

It looks like the top-level Makefile is using system headers for compiling one translation unit and local z3 headers for the other translation unit.

I would define a Z3PATH environment variable to enable use of local builds of Z3.

Here are my changes to the Makefile to build main.out

+Z3_API=$(Z3PATH)/src/api
+

•   g++ $(TOY_ISA_FLAG) -std=c++11 main_z3.o measure/benchmark_toy_isa.cc measure/meas_mh_bhv.cc $(ISA)inst.cc $(TOY_ISA)inst.cc $(SEARCH)mh_prog.cc $(SEARCH)proposals.cc $(ISA)prog.cc $(SEARCH)cost.cc $(SRC)inout.cc $(VERIFY)validator.cc $(VERIFY)cfg.cc $(VERIFY)smt_prog.cc $(VERIFY)smt_var.cc $(SRC)utils.cc -o main.out ../z3/build/libz3$(SO_EXT) $(LINK_EXTRA_FLAGS)
  

•   g++ -I$(Z3_API) -I$(Z3_API)/c++ $(TOY_ISA_FLAG) -std=c++11 main_z3.o measure/benchmark_toy_isa.cc measure/meas_mh_bhv.cc $(ISA)inst.cc $(TOY_ISA)inst.cc $(SEARCH)mh_prog.cc $(SEARCH)proposals.cc $(ISA)prog.cc $(SEARCH)cost.cc $(SRC)inout.cc $(VERIFY)validator.cc $(VERIFY)cfg.cc $(VERIFY)smt_prog.cc $(VERIFY)smt_var.cc $(SRC)utils.cc -o main.out ../z3/build/libz3$(SO_EXT) $(LINK_EXTRA_FLAGS)
  

main_z3.o: main.cc

•   $(CXX) $(TOY_ISA_FLAG) $(CXXFLAGS) $(OS_DEFINES) $(EXAMP_DEBUG_FLAG) $(CXX_OUT_FLAG)main_z3.o  -I../z3/src/api -I../z3/src/api/c++ main.cc
  

•   $(CXX) $(TOY_ISA_FLAG) $(CXXFLAGS) $(OS_DEFINES) $(EXAMP_DEBUG_FLAG) $(CXX_OUT_FLAG)main_z3.o  -I$(Z3_API) -I$(Z3_API)/c++ main.cc