# Based on c_src.mk from erlang.mk by Loic Hoguin <essen@ninenines.eu>

CURDIR := $(shell pwd)
BASEDIR := $(abspath $(CURDIR)/..)

PROJECT ?= keccakf1600
PROJECT := $(strip $(PROJECT))

C_SRC_DIR ?= $(CURDIR)
C_SRC_ENV ?= $(C_SRC_DIR)/env.mk
C_SRC_OUTPUT ?= $(CURDIR)/../priv/$(PROJECT)
ifeq (,$(STATIC_ERLANG_NIF))
C_SRC_TYPE ?= shared
else
C_SRC_TYPE ?= static
endif

OTP_VERSION = $(shell erl -eval 'erlang:display(erlang:system_info(otp_release)), halt().')
# System type and C compiler/flags.

ifeq ($(PLATFORM),)
UNAME_S := $(shell uname -s)

ifeq ($(UNAME_S),Linux)
PLATFORM = linux
else ifeq ($(UNAME_S),Darwin)
PLATFORM = darwin
else ifeq ($(UNAME_S),SunOS)
PLATFORM = solaris
else ifeq ($(UNAME_S),GNU)
PLATFORM = gnu
else ifeq ($(UNAME_S),FreeBSD)
PLATFORM = freebsd
else ifeq ($(UNAME_S),NetBSD)
PLATFORM = netbsd
else ifeq ($(UNAME_S),OpenBSD)
PLATFORM = openbsd
else ifeq ($(UNAME_S),DragonFly)
PLATFORM = dragonfly
else ifeq ($(shell uname -o),Msys)
PLATFORM = msys2
else
$(error Unable to detect platform. Please open a ticket with the output of uname -a.)
endif

export PLATFORM
endif

ifeq ($(PLATFORM),msys2)
	C_SRC_OUTPUT_EXECUTABLE_EXTENSION ?= .exe
	C_SRC_OUTPUT_SHARED_EXTENSION ?= .dll
	C_SRC_OUTPUT_STATIC_EXTENSION ?= .lib
else
	C_SRC_OUTPUT_EXECUTABLE_EXTENSION ?=
	C_SRC_OUTPUT_SHARED_EXTENSION ?= .so
	C_SRC_OUTPUT_STATIC_EXTENSION ?= .a
endif

ifeq ($(C_SRC_TYPE),shared)
	C_SRC_OUTPUT_FILE = $(C_SRC_OUTPUT)$(C_SRC_OUTPUT_SHARED_EXTENSION)
else ifeq ($(C_SRC_TYPE),static)
	C_SRC_OUTPUT_FILE = $(C_SRC_OUTPUT)$(C_SRC_OUTPUT_STATIC_EXTENSION)
else
	C_SRC_OUTPUT_FILE = $(C_SRC_OUTPUT)$(C_SRC_OUTPUT_EXECUTABLE_EXTENSION)
endif

RANLIB ?= ranlib
ARFLAGS ?= cr

ifeq ($(PLATFORM),msys2)
# We hardcode the compiler used on MSYS2. The default CC=cc does
# not produce working code. The "gcc" MSYS2 package also doesn't.
	CC = /mingw64/bin/gcc
	CFLAGS ?= -O3 -std=c99 -finline-functions -fstack-protector -Wall -Wmissing-prototypes
	CXXFLAGS ?= -O3 -finline-functions -fstack-protector -Wall
else ifeq ($(PLATFORM),darwin)
	CC ?= cc
	CFLAGS ?= -O3 -std=c99 -fstack-protector -Wall -Wmissing-prototypes
	CXXFLAGS ?= -O3 -fstack-protector -Wall
	LDFLAGS ?= -flat_namespace -undefined suppress
else ifeq ($(PLATFORM),freebsd)
	CC ?= cc
	CFLAGS ?= -O3 -std=c99 -finline-functions -fstack-protector -Wall -Wmissing-prototypes
	CXXFLAGS ?= -O3 -finline-functions -fstack-protector -Wall
else ifeq ($(PLATFORM),linux)
	CC ?= gcc
	CFLAGS ?= -O3 -std=c99 -finline-functions -fstack-protector -Wall -Wmissing-prototypes
	CXXFLAGS ?= -O3 -finline-functions -fstack-protector -Wall
else ifeq ($(PLATFORM),solaris)
	CC ?= cc
	CFLAGS ?= -O3 -std=c99 -finline-functions -fstack-protector -Wall -Wmissing-prototypes
	CXXFLAGS ?= -O3 -finline-functions -fstack-protector -Wall
	LDLIBS ?= -lssp
endif

ifneq ($(PLATFORM),msys2)
	CFLAGS += -fPIC
	CXXFLAGS += -fPIC
endif

ifneq (,$(STATIC_ERLANG_NIF))
	CFLAGS += -DSTATIC_ERLANG_NIF=1
	CXXFLAGS += -DSTATIC_ERLANG_NIF=1
endif

CFLAGS += -I"$(ERTS_INCLUDE_DIR)" -I"$(ERL_INTERFACE_INCLUDE_DIR)"
CXXFLAGS += -I"$(ERTS_INCLUDE_DIR)" -I"$(ERL_INTERFACE_INCLUDE_DIR)"

NOINTERFACE := $(shell [ $(OTP_VERSION) -ge 23  ] && echo true)
ifeq ($(NOINTERFACE),true)
    LDLIBS += -L"$(ERL_INTERFACE_LIB_DIR)" -lei
else
    LDLIBS += -L"$(ERL_INTERFACE_LIB_DIR)" -lerl_interface -lei
endif

# Verbosity.

V ?= 0

verbose_0 = @
verbose_2 = set -x;
verbose = $(verbose_$(V))

c_verbose_0 = @echo " C     " $(?F);
c_verbose = $(c_verbose_$(V))

cpp_verbose_0 = @echo " CPP   " $(?F);
cpp_verbose = $(cpp_verbose_$(V))

dep_verbose_0 = @echo " DEP   " $(1);
dep_verbose_2 = set -x;
dep_verbose = $(dep_verbose_$(V))

gen_verbose_0 = @echo " GEN   " $@;
gen_verbose_2 = set -x;
gen_verbose = $(gen_verbose_$(V))

link_verbose_0 = @echo " LD    " $(@F);
link_verbose = $(link_verbose_$(V))

ar_verbose_0 = @echo " AR    " $(@F);
ar_verbose = $(ar_verbose_$(V))

ranlib_verbose_0 = @echo " RANLIB" $(@F);
ranlib_verbose = $(ranlib_verbose_$(V))

# Targets.

core_find = $(if $(wildcard $1),$(shell find $(1:%/=%) -type f -name $(subst *,\*,$2)))

ifeq ($(SOURCES),)
	SOURCES := $(sort $(foreach pat,*.c *.C *.cc *.cpp,$(call core_find,$(C_SRC_DIR)/,$(pat))))
endif
OBJECTS = $(addsuffix .o, $(basename $(SOURCES)))

COMPILE_C = $(c_verbose) $(CC) $(CFLAGS) $(CPPFLAGS) -c
COMPILE_CPP = $(cpp_verbose) $(CXX) $(CXXFLAGS) $(CPPFLAGS) -c

all:: deps app

app:: $(C_SRC_OUTPUT_FILE)

deps::

test-build:: $(C_SRC_OUTPUT_FILE)

ifneq (static,$(C_SRC_TYPE))
$(C_SRC_OUTPUT_FILE): $(OBJECTS)
	$(verbose) mkdir -p $(BASEDIR)/priv/
	$(link_verbose) $(CC) $(OBJECTS) \
		$(LDFLAGS) $(if $(filter $(C_SRC_TYPE),shared),-shared) $(LDLIBS) \
		-o $(C_SRC_OUTPUT_FILE)
else
$(C_SRC_OUTPUT_FILE): $(OBJECTS)
	$(verbose) mkdir -p $(BASEDIR)/priv/
	$(ar_verbose) $(AR) $(ARFLAGS) $(C_SRC_OUTPUT_FILE) $(OBJECTS)
	$(ranlib_verbose) $(RANLIB) $(C_SRC_OUTPUT_FILE)
endif

%.o: %.c
	$(COMPILE_C) $(OUTPUT_OPTION) $<

%.o: %.cc
	$(COMPILE_CPP) $(OUTPUT_OPTION) $<

%.o: %.C
	$(COMPILE_CPP) $(OUTPUT_OPTION) $<

%.o: %.cpp
	$(COMPILE_CPP) $(OUTPUT_OPTION) $<

clean:: clean-c_src

clean-c_src:
	$(gen_verbose) rm -f $(C_SRC_OUTPUT_FILE) $(OBJECTS)

ifneq ($(wildcard $(C_SRC_ENV)),)
-include $(C_SRC_ENV)
else
ERTS_INCLUDE_DIR ?= $(shell erl -noshell -s init stop -eval "io:format(\"~s/erts-~s/include/\", [code:root_dir(), erlang:system_info(version)]).")
ERL_INTERFACE_INCLUDE_DIR ?= $(shell erl -noshell -s init stop -eval "io:format(\"~s\", [code:lib_dir(erl_interface, include)]).")
ERL_INTERFACE_LIB_DIR ?= $(shell erl -noshell -s init stop -eval "io:format(\"~s\", [code:lib_dir(erl_interface, lib)]).")
endif