CXX=g++-10
#CXX=clang++-10

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

CXXFLAGS+=-Wall -I.

CXXFLAGS+=-pthread
ifeq ($(CXX),clang++-10)
CXXFLAGS+=-std=c++20 #-stdlib=libc++
else
CXXFLAGS+=-std=c++17
endif

ifeq ($(CXX),clang++-10)
LIBS+= \
-fuse-ld=lld-10 \
-lstdc++
#-lc++ \
#-lc++abi
#-lc++fs
#-lstdc++fs
else
LIBS+= \
-lstdc++ \
-lstdc++fs
endif