#
# Copyright 2014 Amazon.com, Inc. or its affiliates. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License").
# You may not use this file except in compliance with the License.
# A copy of the License is located at
#
#  http://aws.amazon.com/apache2.0
#
# or in the "license" file accompanying this file. This file is distributed
# on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
# express or implied. See the License for the specific language governing
# permissions and limitations under the License.
#

ifeq ($(PLATFORM),Darwin)
    LIBS = -lc -lpthread
else ifeq ($(PLATFORM),FreeBSD)
    LIBS = -lthr
else ifeq ($(PLATFORM),NetBSD)
    LIBS = -lpthread
else
    LIBS = -lpthread -ldl -lrt
endif

CRYPTO_LIBS = -lcrypto

CC	:= $(CROSS_COMPILE)$(CC)
AR	= $(CROSS_COMPILE)ar
RANLIB	= $(CROSS_COMPILE)ranlib
CLANG    ?= clang-3.8
LLVMLINK ?= llvm-link-3.8

SOURCES = $(wildcard *.c *.h)
CRUFT   = $(wildcard *.c~ *.h~ *.c.BAK *.h.BAK *.o *.a *.so *.dylib *.bc *.gcov *.gcda *.gcno *.info *.profraw *.tmp)
INDENT  = $(shell (if indent --version 2>&1 | grep GNU > /dev/null; then echo indent ; elif gindent --version 2>&1 | grep GNU > /dev/null; then echo gindent; else echo true ; fi ))

DEFAULT_CFLAGS = -pedantic -Wall -Werror -Wimplicit -Wunused -Wcomment -Wchar-subscripts -Wuninitialized \
                 -Wshadow -Wcast-qual -Wcast-align -Wwrite-strings -fPIC -Wno-missing-braces\
                 -std=c99 -D_POSIX_C_SOURCE=200809L -O2 -I$(LIBCRYPTO_ROOT)/include/ \
                 -I$(S2N_ROOT)/api/ -I$(S2N_ROOT) -Wno-deprecated-declarations -Wno-unknown-pragmas -Wformat-security \
                 -D_FORTIFY_SOURCE=2 -fgnu89-inline 

COVERAGE_CFLAGS = -fprofile-arcs -ftest-coverage
COVERAGE_LDFLAGS = --coverage

ifdef S2N_COVERAGE
    DEFAULT_CFLAGS += ${COVERAGE_CFLAGS}
    LIBS += ${COVERAGE_LDFLAGS}
endif

# Add a flag to disable stack protector for alternative libcs without
# libssp.
ifneq ($(NO_STACK_PROTECTOR), 1)
DEFAULT_CFLAGS += -Wstack-protector -fstack-protector-all
endif

# Define S2N_TEST_IN_FIPS_MODE - to be used for testing when present.
ifdef S2N_TEST_IN_FIPS_MODE
    DEFAULT_CFLAGS += -DS2N_TEST_IN_FIPS_MODE
endif

CFLAGS += ${DEFAULT_CFLAGS}

ifdef GCC_VERSION
	ifneq ("$(GCC_VERSION)","NONE")
		CC=gcc-$(GCC_VERSION)
	endif
# Make doesn't support greater than checks, this uses `test` to compare values, then `echo $$?` to return the value of test's
# exit code and finally using the built in make `ifeq` to check if it was true and then add the extra flag.
	ifeq ($(shell test $(GCC_VERSION) -gt 7; echo $$?),0)
		CFLAGS += -Wimplicit-fallthrough
	endif
endif

DEBUG_CFLAGS = -g3 -ggdb -fno-omit-frame-pointer -fno-optimize-sibling-calls

ifdef S2N_ADDRESS_SANITIZER
	CFLAGS += -fsanitize=address -fuse-ld=gold ${DEBUG_CFLAGS}
endif

ifdef S2N_DEBUG
	CFLAGS += ${DEBUG_CFLAGS}
endif

FUZZ_CFLAGS = -fsanitize-coverage=trace-pc-guard -fsanitize=address,undefined,leak
LLVM_GCOV_MARKER_FILE=${COVERAGE_DIR}/use-llvm-gcov.tmp

ifeq ($(S2N_UNSAFE_FUZZING_MODE),1)
    # Override compiler to clang if fuzzing, since gcc does not support as many sanitizer flags as clang
    CC=clang

    # Create a marker file so that later invocations of make can pick the right COV_TOOL by default
    $(shell touch "${LLVM_GCOV_MARKER_FILE}")

    # Turn on debugging and fuzzing flags when S2N_UNSAFE_FUZZING_MODE is enabled to give detailed stack traces in case
    # an error occurs while fuzzing.
    CFLAGS += ${DEFAULT_CFLAGS} ${DEBUG_CFLAGS} ${FUZZ_CFLAGS}
endif

# If COV_TOOL isn't set, pick a default COV_TOOL depending on if the LLVM Marker File was created.
ifndef COV_TOOL
	ifneq ("$(wildcard $(LLVM_GCOV_MARKER_FILE))","")
		COV_TOOL=llvm-gcov.sh
	else
		COV_TOOL=gcov
	endif
endif

CFLAGS_LLVM = ${DEFAULT_CFLAGS} -emit-llvm -c -g -O1

$(BITCODE_DIR)%.bc: %.c
	$(CLANG) $(CFLAGS_LLVM) -o $@ $< 


INDENTOPTS = -npro -kr -i4 -ts4 -nut -sob -l180 -ss -ncs -cp1

.PHONY : indentsource
indentsource:
	( for source in ${SOURCES} ; do ${INDENT} ${INDENTOPTS} $$source; done )
	
.PHONY : gcov
gcov: 
	( for source in ${SOURCES} ; do $(COV_TOOL) $$source;  done )

.PHONY : lcov
lcov: 
	lcov --capture --directory . --gcov-tool $(COV_TOOL) --output ./coverage.info


.PHONY : decruft
decruft:
	$(RM) -- ${CRUFT}