Makefile

MAJOR?=0
MINOR?=1

VERSION=$(MAJOR).$(MINOR)

BIN := bridge
TEST_EXEC = tests

# Specify the source files, excluding the test and the main source file
MAIN_SRC = bridge.c
SRCS = $(filter-out tests.c $(MAIN_SRC), $(wildcard *.c))
TEST_SRC = tests.c

OBJDIR := obj
TEST_OBJDIR := test_obj

DEPDIR := $(OBJDIR)/.deps

# object files, auto generated from source files
OBJS := $(patsubst %,$(OBJDIR)/%.o,$(basename $(SRCS)))
TEST_OBJS := $(patsubst %,$(TEST_OBJDIR)/%.o,$(basename $(SRCS)))
TEST_OBJS += $(TEST_OBJDIR)/$(basename $(TEST_SRC)).o

# dependency files, auto generated from source files
DEPS := $(patsubst %,$(DEPDIR)/%.d,$(basename $(SRCS)))

# compilers (at least gcc and clang) don't create the subdirectories automatically
$(shell mkdir -p $(dir $(OBJS)) >/dev/null)
$(shell mkdir -p $(dir $(TEST_OBJS)) >/dev/null)
$(shell mkdir -p $(dir $(DEPS)) >/dev/null)

CC=gcc
CFLAGS+=-O2 -flto=auto -ffat-lto-objects -fexceptions -g -grecord-gcc-switches -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -march=x86-64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection
LDLIBS=-lqpid-proton -lpthread
LDFLAGS+=-Wl,-z,relro -Wl,--as-needed  -Wl,-z,now -specs=/usr/lib/rpm/redhat/redhat-hardened-ld -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1

DEPFLAGS = -MT $@ -MD -MP -MF $(DEPDIR)/$*.Td

# compile C source files
COMPILE.c = $(CC) $(DEPFLAGS) $(CFLAGS) $(CPPFLAGS) -c -o $@

# link object files to binary
LINK.o = $(LD) $(LDFLAGS) $(CFLAGS) $(LDLIBS) -o $@

# precompile step
PRECOMPILE =
# postcompile step
POSTCOMPILE = mv -f $(DEPDIR)/$*.Td $(DEPDIR)/$*.d

HUB_NAMESPACE = "localhost"
BRIDGE_IMAGE_NAME = "sgbridge"

all: $(BIN)
debug: CFLAGS=-Wall -g
debug: all

.PHONY: clean
clean:
	rm -fr $(OBJDIR) $(TEST_OBJDIR) $(DEPDIR)

.PHONY: clean-image
clean-image: version-check
	@echo "+ $@"
	@podman rmi ${HUB_NAMESPACE}/${BUILDER_IMAGE_NAME}:latest  || true

.PHONY: image
image: version-check
	@echo "+ $@"
	@buildah bud -t ${HUB_NAMESPACE}/${BRIDGE_IMAGE_NAME}:latest -f build/Dockerfile .
	@echo 'Done.'

$(BIN): $(OBJS) $(OBJDIR)/$(basename $(MAIN_SRC)).o
	$(CC) -o $@ $^ $(LDFLAGS) $(CFLAGS) $(LDLIBS)

$(OBJDIR)/%.o: %.c %.h
$(OBJDIR)/%.o: %.c $(DEPDIR)/%.d %.h
	$(PRECOMPILE)
	$(COMPILE.c) $<
	$(POSTCOMPILE)

$(OBJDIR)/%.o : %.c $(DEPDIR)/%.d %.h | $(DEPDIR)
	$(COMPILE.c) $(OUTPUT_OPTION) $<

.PRECIOUS: $(DEPDIR)/%.d
$(DEPDIR)/%.d: ;

# Build unit test executable
$(TEST_EXEC): $(TEST_OBJS)
	$(CC) $(LDFLAGS) -o $@ $^ $(LDLIBS)

# Compile unit test file
$(TEST_OBJDIR)/%.o: %.c
	@mkdir -p $(TEST_OBJDIR)
	$(CC) $(CFLAGS) -c -o $@ $<

# Run unit tests
test: $(TEST_EXEC)
	@$(TEST_EXEC)

#################################
# Utilities
#################################

.PHONY: version-check
version-check:
	@echo "+ $@"
	ifdef VERSION
		@echo "VERSION is ${VERSION}"
	else
		@echo "VERSION is not set!"
		@false;
	endif

-include $(DEPS)