Makefile

KALDI_ROOT=/opt/kaldi
KALDISERVE_INCLUDE=../../include

HOST_SYSTEM = $(shell uname | cut -f 1 -d_)
SYSTEM ?= $(HOST_SYSTEM)
CXX = g++
CPPFLAGS += `pkg-config --cflags protobuf grpc`
CXXFLAGS += -std=c++11 -O3

LDFLAGS += -L/usr/local/lib `pkg-config --libs protobuf grpc++` \
	-Wl,--no-as-needed -lgrpc++_reflection -Wl,--as-needed -ldl

INCLUDES = -I${KALDISERVE_INCLUDE} -I${KALDI_ROOT}/src -I${KALDI_ROOT}/tools/openfst/include
LIBS = -rdynamic -lboost_system -lkaldiserve -static-libstdc++

PROTOC = protoc
GRPC_CPP_PLUGIN = grpc_cpp_plugin
GRPC_CPP_PLUGIN_PATH ?= `which $(GRPC_CPP_PLUGIN)`

PROTOS_PATH = ./protos

vpath %.proto $(PROTOS_PATH)

all: system-check build/kaldi_serve_app

build/kaldi_serve_app: $(PROTOS_PATH)/kaldi_serve.pb.o $(PROTOS_PATH)/kaldi_serve.grpc.pb.o build/kaldi_serve_app.o
	$(CXX) $^ $(LDFLAGS) $(LIBS) -o $@

build/kaldi_serve_app.o: src/app.cc $(wildcard src/*.hpp)
	$(CXX) $(CXXFLAGS) $(INCLUDES) -I $(PROTOS_PATH) -c src/app.cc -o $@

.PRECIOUS: %.grpc.pb.cc
%.grpc.pb.cc: %.proto
	$(PROTOC) -I $(PROTOS_PATH) --grpc_out=$(PROTOS_PATH) --plugin=protoc-gen-grpc=$(GRPC_CPP_PLUGIN_PATH) $<

.PRECIOUS: %.pb.cc
%.pb.cc: %.proto
	$(PROTOC) -I $(PROTOS_PATH) --cpp_out=$(PROTOS_PATH) $<

clean:
	rm -f ./build/* $(PROTOS_PATH)/*.pb.* $(PROTOS_PATH)/*.o

# The following is to test your system and ensure a smoother experience.
# They are by no means necessary to actually compile a grpc-enabled software.

PROTOC_CMD = which $(PROTOC)
PROTOC_CHECK_CMD = $(PROTOC) --version | grep -q libprotoc.3
PLUGIN_CHECK_CMD = which $(GRPC_CPP_PLUGIN)
HAS_PROTOC = $(shell $(PROTOC_CMD) > /dev/null && echo true || echo false)
ifeq ($(HAS_PROTOC),true)
HAS_VALID_PROTOC = $(shell $(PROTOC_CHECK_CMD) 2> /dev/null && echo true || echo false)
endif
HAS_PLUGIN = $(shell $(PLUGIN_CHECK_CMD) > /dev/null && echo true || echo false)

SYSTEM_OK = false
ifeq ($(HAS_VALID_PROTOC),true)
ifeq ($(HAS_PLUGIN),true)
SYSTEM_OK = true
endif
endif

system-check:
ifneq ($(HAS_VALID_PROTOC),true)
	@echo " DEPENDENCY ERROR"
	@echo
	@echo "You don't have protoc 3.0.0 installed in your path."
	@echo "Please install Google protocol buffers 3.0.0 and its compiler."
	@echo "You can find it here:"
	@echo
	@echo "   https://github.com/google/protobuf/releases/tag/v3.0.0"
	@echo
	@echo "Here is what I get when trying to evaluate your version of protoc:"
	@echo
	-$(PROTOC) --version
	@echo
	@echo
endif
ifneq ($(HAS_PLUGIN),true)
	@echo " DEPENDENCY ERROR"
	@echo
	@echo "You don't have the grpc c++ protobuf plugin installed in your path."
	@echo "Please install grpc. You can find it here:"
	@echo
	@echo "   https://github.com/grpc/grpc"
	@echo
	@echo "Here is what I get when trying to detect if you have the plugin:"
	@echo
	-which $(GRPC_CPP_PLUGIN)
	@echo
	@echo
endif
ifneq ($(SYSTEM_OK),true)
	@false
endif