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PROJECTNAME=unicode
VERSION=$(shell dpkg-parsechangelog --show-field Version)

DISTROS=base debian10 ubuntu2004 ubuntu2010

ifeq ($(wildcard $(shell which clang++-11)),)
ifeq ($(wildcard $(shell which clang++)),)
$(error No clang++-11 nor clang++ available!)
else
CXX=clang++
endif
else
CXX=clang++-11
# GCC is buggy: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85282
#CXX=g++-10
endif

STANDARD=c++17
#STANDARD=c++20

ifeq ($(CXXFLAGS),)
CXXFLAGS=-O0 -g -D_DEBUG
#CXXFLAGS=-O2 -DNDEBUG
endif

CXXFLAGS+=-Wall -Iinclude -std=$(STANDARD)

ifeq ($(CXX),clang++-11)
COMPILER_SUITE=clang
LIBS+=-fuse-ld=lld-11
endif

ifeq ($(CXX),clang++)
COMPILER_SUITE=clang
LIBS+=-fuse-ld=lld
endif

ifeq ($(COMPILER_SUITE),clang)
CXXFLAGS+=-stdlib=libc++
endif

LDLIBS+=\
-lboost_context \
-lboost_filesystem \
-lboost_timer \
-lboost_system \

ifeq ($(COMPILER_SUITE),clang)
LIBS+= \
-lc++ \
-lc++abi
#-lc++fs
#-lstdc++ \
#-lstdc++fs
else
LIBS+= \
-lstdc++
#-lstdc++fs
endif

SRC=\
    src/file.cpp \
    src/recode.cpp \
    src/validate.cpp \
    src/test-unicode.cpp

all: src/recode src/test-unicode src/validate

test: src/test-unicode
	src/test-unicode

src/recode: src/recode.o src/file.o dep
	$(CXX) $(LDFLAGS) src/recode.o src/file.o $(LDLIBS) $(LIBS) -o $@

src/validate: src/validate.o src/file.o dep
	$(CXX) $(LDFLAGS) src/validate.o src/file.o $(LDLIBS) $(LIBS) -o $@

src/test-unicode: src/test-unicode.o src/file.o dep
	$(CXX) $(LDFLAGS) $< $(LDLIBS) $(LIBS) -o $@

dep: $(SRC:.cpp=.d)

%.d: %.cpp
	$(CXX) $(CXXFLAGS) -MM -MP -MF $@ -MT $(*D)/$(*F).o -c $<

%.o: %.cpp %.d
	$(CXX) $(CXXFLAGS) -c $< -o $@

clean:
	-rm -f src/recode src/test-unicode src/validate
	-rm -rf result
	-find . -name '*.o' -o -name '*.d' -o -name '*.gcno' -o -name '*.gcda' | xargs rm -f

install:
	mkdir -p $(DESTDIR)/usr/include
	cp include/unicode.h $(DESTDIR)/usr/include
	mkdir -p $(DESTDIR)/usr/bin
	cp src/recode $(DESTDIR)/usr/bin/unicode-recode
	cp src/validate $(DESTDIR)/usr/bin/unicode-validate

deb:
	# build binary deb package
	dpkg-buildpackage -rfakeroot

deb-src:
	dh_clean
	dh_auto_clean
	dpkg-source -b -I.git -Iresult .

$(DISTROS): deb-src
	sudo pbuilder build --basetgz /var/cache/pbuilder/$@.tgz --buildresult result/$@ ../$(PROJECTNAME)_$(VERSION).dsc
	debsign result/$@/$(PROJECTNAME)_$(VERSION)_amd64.changes

debs: $(DISTROS)

.PHONY: all test clean install dep deb deb-src $(DISTROS)

-include $(wildcard $(SRC:.cpp=.d))