CXX=clang++-14

ifeq ($(shell which $(CXX)),)
CXX=clang++-13
endif

ifeq ($(shell which $(CXX)),)
CXX=clang++-11
endif

ifeq ($(shell which $(CXX)),)
CXX=g++-11
endif

ifeq ($(shell which $(CXX)),)
CXX=g++-10
endif

ifeq ($(shell which $(CXX)),)
CXX=g++-8
endif

ifeq ($(shell which $(CXX)),)
CXX=clang++
endif

ifeq ($(shell which $(CXX)),)
CXX=g++-10
endif

ifeq ($(shell which $(CXX)),)
CXX=g++-9
endif

ifeq ($(shell which $(CXX)),)
CXX=g++
endif

ifeq ($(LINK_STATICALLY),1)
LDFLAGS+=-static
endif

ifeq ($(CXXFLAGS),)
CXXFLAGS=-O2 -g -DNDEBUG
#CXXFLAGS=-O0 -g -D_DEBUG
endif
# -fprofile-instr-generate -fcoverage-mapping
# gcc:--coverage

CXXFLAGS+=-Wall -I.

YEAR=$(shell date +"%Y")
CXXFLAGS+=-DYEAR=\"$(YEAR)\"

CXXFLAGS+=-pthread
ifeq ($(CXX),clang++-11)
CXXFLAGS+=-std=c++20 #-stdlib=libc++
else ifeq ($(CXX),clang++-14)
CXXFLAGS+=-std=c++20 #-stdlib=libc++
else ifeq ($(CXX),clang++-13)
CXXFLAGS+=-std=c++20 #-stdlib=libc++
else ifeq ($(CXX),g++-11)
CXXFLAGS+=-std=c++20 #-stdlib=libc++
else
CXXFLAGS+=-std=c++17
endif

ifeq ($(CXX),clang++-11)
LIBS+= \
-fuse-ld=lld-11 \
-lstdc++
#-lc++ \
#-lc++abi
#-lc++fs
#-lstdc++fs
LLVMPROFDATA=llvm-profdata-11
LLVMCOV=llvm-cov-11
CXXTYPE=clang++
else ifeq ($(CXX),clang++-14)
LIBS+= \
-fuse-ld=lld-14 \
-lc++ -lc++abi
LLVMPROFDATA=llvm-profdata-14
LLVMCOV=llvm-cov-14
CXXTYPE=clang++
else ifeq ($(CXX),clang++-13)
LIBS+= \
-fuse-ld=lld-13 \
-lstdc++
LLVMPROFDATA=llvm-profdata-13
LLVMCOV=llvm-cov-13
CXXTYPE=clang++
else
LIBS+= \
-lstdc++ \
-lstdc++fs
CXXTYPE=g++
endif

SRC_ROOT=$(shell echo $(MAKEFILE_LIST) | tr " " "\n" | grep common.mk | sed -e 's/\([^ ]*\)common.mk/\1/g')
VERSION=$(shell dpkg-parsechangelog --show-field Version --file $(SRC_ROOT)/debian/changelog)
CXXFLAGS+=-DVERSION=\"$(VERSION)\"

LIBS+=$(shell pkg-config --libs fmt)
CXXFLAGS+=$(shell pkg-config --cflags fmt)