PYTHON2 ?= python
# Check version because new distros have python to default to Python3
PYTHON_VERSION := $(shell $(PYTHON2) -c "print(__import__('sys').version.split(' ' )[0].split('.')[0])")
ifeq ($(PYTHON_VERSION),)
  $(warning Python2 required by cpplint, but PYTHON2=$(PYTHON2) not found. See 'make help')
endif
ifeq ($(PYTHON_VERSION),3)
  $(warning Python2 required by cpplint, but PYTHON2=$(PYTHON2) is Python3. See 'make help')
endif

.PHONY: cpplint
cpplint:
	@$(PYTHON2) $(CPPLINT)/cpplint.py --output=vs7 --counting=detailed --root=src --extension=hpp,cpp --filter=-runtime/indentation_namespace,-readability/namespace,-legal/copyright,-whitespace/indent,-runtime/reference,-build/c++11 $(shell find src/stan -name '*.hpp' -o -name '*.cpp')