CXX=clang++-13

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.

CXXFLAGS+=-pthread
ifeq ($(CXX),clang++-11)
CXXFLAGS+=-std=c++20 #-stdlib=libc++
else ifeq ($(CXX),clang++-13)
CXXFLAGS+=-std=c++2b #-stdlib=libc++
else ifeq ($(CXX),g++-11)
CXXFLAGS+=-std=c++20 #-stdlib=libc++
else
CXXFLAGS+=-std=c++17
endif

ifeq ($(CXX),clang++-11)
LIBS+= \
-fuse-ld=lld-11 \
-lstdc++
#-lc++ \
#-lc++abi
#-lc++fs
#-lstdc++fs
else ifeq ($(CXX),clang++-13)
LIBS+= \
-fuse-ld=lld-13 \
-lstdc++
else
LIBS+= \
-lstdc++ \
-lstdc++fs
endif