# Makefile for Stan.
##


# The default target of this Makefile is...
help:

## Disable implicit rules.
.SUFFIXES:

##
# Users should only need to set these three variables for use.
# - CC: The compiler to use. Expecting g++ or clang++.
# - O: Optimization level. Valid values are {0, 1, 2, 3}.
# - AR: archiver (must specify for cross-compiling)
# - OS_TYPE: {mac, win, linux}
##

##
# Library locations
##
STAN ?=
MATH ?= lib/stan_math/

-include $(MATH)make/default_compiler_options
CXXFLAGS += -I src -isystem $(MATH) -DFUSION_MAX_VECTOR_SIZE=12 -Wno-unused-local-typedefs
LDLIBS_STANC = -Lbin -lstanc

-include $(HOME)/.config/stan/make.local  # define local variables
-include make/local                       # overwrite local variables

CXX = $(CC)

-include $(MATH)make/libraries

##
# Get information about the compiler used.
# - CC_TYPE: {g++, clang++, mingw32-g++, other}
# - CC_MAJOR: major version of CC
# - CC_MINOR: minor version of CC
##
-include $(MATH)make/detect_cc

# OS_TYPE is set automatically by this script
##
# These includes should update the following variables
# based on the OS:
#   - CFLAGS
#   - GTEST_CXXFLAGS
#   - EXE
##
-include $(MATH)make/detect_os

include make/libstan  # bin/libstan.a bin/libstanc.a
include make/tests    # tests
include make/doxygen  # doxygen
include make/manual   # manual: manual, doc/stan-reference.pdf
include make/cpplint  # cpplint

##
# Dependencies
##
ifneq (,$(filter-out test-headers generate-tests clean% %-test math-% %.d,$(MAKECMDGOALS)))
  -include $(addsuffix .d,$(subst $(EXE),,$(MAKECMDGOALS)))
endif


bin/%.o : src/%.cpp
	@mkdir -p $(dir $@)
	$(COMPILE.cc) -O$O $(OUTPUT_OPTION) $<

##
# Rule for generating dependencies.
##
bin/%.d : src/%.cpp
	@mkdir -p $(dir $@)
	@set -e; \
	rm -f $@; \
	$(COMPILE.cc) -O$O $(TARGET_ARCH) -MM $< > $@.$$$$; \
	sed -e 's,\($(notdir $*)\)\.o[ :]*,$(dir $@)\1\.o $@ : ,g' < $@.$$$$ > $@; \
	rm -f $@.$$$$



.PHONY: help
help:
	@echo '--------------------------------------------------------------------------------'
	@echo 'Stan makefile:'
	@echo '  Current configuration:'
	@echo '  - OS_TYPE (Operating System): ' $(OS_TYPE)
	@echo '  - CC (Compiler):              ' $(CC)
	@echo '  - Compiler version:           ' $(CC_MAJOR).$(CC_MINOR)
	@echo '  - O (Optimization Level):     ' $(O)
	@echo '  - O_STANC (Opt for stanc):    ' $(O_STANC)
ifdef TEMPLATE_DEPTH
	@echo '  - TEMPLATE_DEPTH:             ' $(TEMPLATE_DEPTH)
endif
	@echo '  - STAN_HOME                   ' $(STAN_HOME)
	@echo '  Library configuration:'
	@echo '  - EIGEN                       ' $(EIGEN)
	@echo '  - BOOST                       ' $(BOOST)
	@echo '  - GTEST                       ' $(GTEST)
	@echo ''
	@echo 'Common targets:'
	@echo '  Documentation:'
	@echo '  - doc            : Builds the documention and copies to doc/'
	@echo '                     (requires LaTeX and bookdown installation)'
	@echo '  - doxygen        : Builds the API documentation. The documentation is located'
	@echo '                     doc/api/'
	@echo '                     (requires doxygen installation)'
	@echo '  Submodule:'
	@echo '  - math-revert    : Resets the Stan Math Library git submodule to the tagged'
	@echo '                     version'
	@echo '  - math-update    : Updates the Stan Math Library git submodule to the latest'
	@echo '                     development version'
	@echo '  - math-update/<branch-name> : Updates the Stan Math Library git submodule to'
	@echo '                     the branch specified'
	@echo ''
	@echo 'Tests:'
	@echo ''
	@echo '  Unit tests are built through make by specifying the executable as the target'
	@echo '  to make. For a test in src/test/*_test.cpp, the executable is test/*$(EXE).'
	@echo ''
	@echo '  Header tests'
	@echo '  - test-headers  : tests all source headers to ensure they are compilable and'
	@echo '                     include enough header files.'
	@echo ''
	@echo '  To run a single header test, add "-test" to the end of the file name.'
	@echo '  Example: make src/stan/math/constants.hpp-test'
	@echo ''
	@echo '  Cpplint'
	@echo '  - cpplint       : runs cpplint.py on source files. requires python 2.7.'
	@echo '                    cpplint is called using the CPPLINT variable:'
	@echo '                      CPPLINT = $(CPPLINT)'
	@echo '                    To set the version of python 2, set the PYTHON2 variable:'
	@echo '                      PYTHON2 = $(PYTHON2)'
	@echo ''
	@echo 'Clean:'
	@echo '  - clean         : Basic clean. Leaves doc and compiled libraries intact.'
	@echo '  - clean-manual  : Cleans temporary files from building the manual.'
	@echo '  - clean-deps    : Removes dependency files for tests. If tests stop building,'
	@echo '                    run this target.'
	@echo '  - clean-all     : Cleans up all of Stan.'
	@echo ''
	@echo 'Higher level targets:'
	@echo '  - docs          : Builds all docs.'
	@echo ''
	@echo '--------------------------------------------------------------------------------'


##
# Documentation
##

.PHONY: docs
docs: doc doxygen

##
# Clean up.
##
MODEL_SPECS := $(shell find src/test -type f -name '*.stan')
.PHONY: clean clean-demo clean-dox clean-manual clean-models clean-all clean-deps
clean:
	$(RM) $(shell find src -type f -name '*.dSYM') $(shell find src -type f -name '*.d.*')
	$(RM) $(wildcard $(MODEL_SPECS:%.stan=%.hpp))
	$(RM) $(wildcard $(MODEL_SPECS:%.stan=%$(EXE)))
	$(RM) $(wildcard $(MODEL_SPECS:%.stan=%.o))
	$(RM) $(wildcard $(MODEL_SPECS:%.stan=%.d))

clean-dox:
	$(RM) -r doc/api

clean-deps:
	@echo '  removing dependency files'
	$(shell find . -type f -name '*.d' -exec rm {} +)

clean-all: clean clean-docs clean-deps clean-libraries
	$(RM) -r test bin
	@echo '  removing .o files'
	$(shell find src -type f -name '*.o' -exec rm {} +)


##
# Submodule related tasks
##
.PHONY: math-revert
math-revert:
	git submodule update --init --recursive

.PHONY: math-update
math-update:
	git submodule init
	git submodule update --recursive

math-update/%: math-update
	cd $(MATH) && git fetch --all && git checkout $* && git pull