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#!/usr/bin/make -f

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BUILD_DIR := build
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RELEASE_OPTIMIZE_FLAGS ?= -g -O3
DEBUG_OPTIMIZE_FLAGS ?= -g -O0
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JS_OPTIMIZE_FLAGS ?= -O3
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FUZZING_OPTIMIZE_FLAGS ?= -O3
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CC = gcc
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EMCC = emcc
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AFL_CC = afl_gcc
AFL_CXX = afl-g++
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RELEASE_TARGET := $(BUILD_DIR)/libolm.so
DEBUG_TARGET := $(BUILD_DIR)/libolm_debug.so
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JS_TARGET := javascript/olm.js

JS_EXPORTED_FUNCTIONS := javascript/exported_functions.json

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PUBLIC_HEADERS := include/olm/olm.h
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SOURCES := $(wildcard src/*.cpp) $(wildcard src/*.c)
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RELEASE_OBJECTS := $(patsubst src/%,$(BUILD_DIR)/release/%,$(patsubst %.c,%.o,$(patsubst %.cpp,%.o,$(SOURCES))))
DEBUG_OBJECTS := $(patsubst src/%,$(BUILD_DIR)/debug/%,$(patsubst %.c,%.o,$(patsubst %.cpp,%.o,$(SOURCES))))
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FUZZER_OBJECTS := $(patsubst src/%,$(BUILD_DIR)/fuzzers/objects/%,$(patsubst %.c,%.o,$(patsubst %.cpp,%.o,$(SOURCES))))
FUZZER_SOURCES := $(wildcard fuzzers/fuzz_*.cpp) $(wildcard fuzzers/fuzz_*.c)
FUZZER_BINARIES := $(patsubst fuzzers/%,$(BUILD_DIR)/fuzzers/%,$(patsubst %.c,%,$(patsubst %.cpp,%,$(FUZZER_SOURCES))))
FUZZER_DEBUG_BINARIES := $(patsubst $(BUILD_DIR)/fuzzers/fuzz_%,$(BUILD_DIR)/fuzzers/debug_%,$(FUZZER_BINARIES))
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TEST_SOURCES := $(wildcard tests/test_*.cpp) $(wildcard tests/test_*.c)
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TEST_BINARIES := $(patsubst tests/%,$(BUILD_DIR)/tests/%,$(patsubst %.c,%,$(patsubst %.cpp,%,$(TEST_SOURCES))))
JS_OBJECTS := $(patsubst src/%,$(BUILD_DIR)/javascript/%,$(patsubst %.c,%.js.bc,$(patsubst %.cpp,%.js.bc,$(SOURCES))))
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JS_PRE := $(wildcard javascript/*pre.js)
JS_POST := $(wildcard javascript/*post.js)
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CPPFLAGS += -Iinclude -Ilib
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# we rely on <stdint.h>, which was introduced in C99
CFLAGS += -Wall -Werror -std=c99 -fPIC
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CXXFLAGS += -Wall -Werror -std=c++11 -fPIC
LDFLAGS += -Wall -Werror
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EMCCFLAGS = --closure 1 --memory-init-file 0 -s NO_FILESYSTEM=1 -s INVOKE_RUN=0
# NO_BROWSER is kept for compatibility with emscripten 1.35.24, but is no
# longer needed.
EMCCFLAGS += -s NO_BROWSER=1

EMCC.c = $(EMCC) $(CFLAGS) $(CPPFLAGS) -c
EMCC.cc = $(EMCC) $(CXXFLAGS) $(CPPFLAGS) -c
EMCC_LINK = $(EMCC) $(LDFLAGS) $(EMCCFLAGS)

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AFL.c = $(AFL_CC) $(CFLAGS) $(CPPFLAGS) -c
AFL.cc = $(AFL_CXX) $(CXXFLAGS) $(CPPFLAGS) -c
AFL_LINK.c = $(AFL_CC) $(LDFLAGS) $(CFLAGS) $(CPPFLAGS)
AFL_LINK.cc = $(AFL_CXX) $(LDFLAGS) $(CXXFLAGS) $(CPPFLAGS)

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# generate .d files when compiling
CPPFLAGS += -MMD

### per-target variables

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$(RELEASE_OBJECTS): CFLAGS += $(RELEASE_OPTIMIZE_FLAGS)
$(RELEASE_OBJECTS): CXXFLAGS += $(RELEASE_OPTIMIZE_FLAGS)
$(RELEASE_TARGET): LDFLAGS += $(RELEASE_OPTIMIZE_FLAGS)

$(DEBUG_OBJECTS): CFLAGS += $(DEBUG_OPTIMIZE_FLAGS)
$(DEBUG_OBJECTS): CXXFLAGS += $(DEBUG_OPTIMIZE_FLAGS)
$(DEBUG_TARGET): LDFLAGS += $(DEBUG_OPTIMIZE_FLAGS)
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$(TEST_BINARIES): CPPFLAGS += -Itests/include
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$(TEST_BINARIES): LDFLAGS += $(DEBUG_OPTIMIZE_FLAGS) -L$(BUILD_DIR)
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$(FUZZER_OBJECTS): CFLAGS += $(FUZZER_OPTIMIZE_FLAGS)
$(FUZZER_OBJECTS): CXXFLAGS += $(FUZZER_OPTIMIZE_FLAGS)
$(FUZZER_BINARIES): CPPFLAGS += -Ifuzzers/include
$(FUZZER_BINARIES): LDFLAGS += $(FUZZER_OPTIMIZE_FLAGS) -L$(BUILD_DIR)
$(FUZZER_DEBUG_BINARIES): CPPFLAGS += -Ifuzzers/include
$(FUZZER_DEBUG_BINARIES): LDFLAGS += $(DEBUG_OPTIMIZE_FLAGS)

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$(JS_OBJECTS): CFLAGS += $(JS_OPTIMIZE_FLAGS)
$(JS_OBJECTS): CXXFLAGS += $(JS_OPTIMIZE_FLAGS)
$(JS_TARGET): LDFLAGS += $(JS_OPTIMIZE_FLAGS)

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### top-level targets

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lib: $(RELEASE_TARGET)
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.PHONY: lib

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# Make sure that the build directory exists.
# We can't check the build directory into git because it is empty.
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makedirs:
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	mkdir -p $(BUILD_DIR)/release $(BUILD_DIR)/debug $(BUILD_DIR)/javascript\
            $(BUILD_DIR)/tests $(BUILD_DIR)/fuzzers/objects
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.PHONY: makedirs

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$(RELEASE_TARGET): $(RELEASE_OBJECTS)
	$(CXX) $(LDFLAGS) --shared -fPIC \
            -Wl,--version-script,version_script.ver \
            $(OUTPUT_OPTION) $(RELEASE_OBJECTS)

debug: $(DEBUG_TARGET)
.PHONY: debug

$(DEBUG_TARGET): $(DEBUG_OBJECTS)
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	$(CXX) $(LDFLAGS) --shared -fPIC \
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            -Wl,--version-script,version_script.ver \
            $(OUTPUT_OPTION) $(DEBUG_OBJECTS)

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js: $(JS_TARGET)
.PHONY: js

$(JS_TARGET): $(JS_OBJECTS) $(JS_PRE) $(JS_POST) $(JS_EXPORTED_FUNCTIONS)
	$(EMCC_LINK) \
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               --pre-js $(JS_PRE) --post-js $(JS_POST) \
               -s "EXPORTED_FUNCTIONS=@$(JS_EXPORTED_FUNCTIONS)" \
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               $(JS_OBJECTS) -o $@

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clean:;
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	rm -rf $(RELEASE_OBJECTS) $(RELEASE_OBJECTS:.o=.d) \
               $(DEBUG_OBJECTS) $(DEBUG_OBJECTS:.o=.d) \
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               $(TEST_BINARIES) $(TEST_BINARIES:=.d) \
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               $(JS_OBJECTS) $(JS_OBJECTS:.bc=.d) $(JS_TARGET) \
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               $(JS_EXPORTED_FUNCTIONS)\
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               $(RELEASE_TARGET) $(DEBUG_TARGET)\
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               $(FUZZER_OBJECTS) $(FUZZER_OBJECTS:.o=.d)\
               $(FUZZER_BINARIES) $(FUZZER_BINARIES:=.d)\
               $(FUZZER_DEBUG_BINARIES) $(FUZZER_DEBUG_BINARIES:=.d)\
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build_tests: $(TEST_BINARIES)

test: build_tests
	for i in $(TEST_BINARIES); do \
	    echo $$i; \
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	    $$i || exit $$?; \
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	done

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fuzzers: $(FUZZER_BINARIES) $(FUZZER_DEBUG_BINARIES)
.PHONY: fuzzers

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$(JS_EXPORTED_FUNCTIONS): $(PUBLIC_HEADERS)
	perl -MJSON -ne '/(olm_[^( ]*)\(/ && push @f, "_$$1"; END { print encode_json \@f }' $^ > $@.tmp
	mv $@.tmp $@

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all: test js lib debug
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.PHONY: lib

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### rules for building objects
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$(BUILD_DIR)/release/%.o: src/%.c | makedirs
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	$(COMPILE.c) $(OUTPUT_OPTION) $<

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$(BUILD_DIR)/release/%.o: src/%.cpp | makedirs
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	$(COMPILE.cc) $(OUTPUT_OPTION) $<

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$(BUILD_DIR)/debug/%.o: src/%.c | makedirs
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	$(COMPILE.c) $(OUTPUT_OPTION) $<

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$(BUILD_DIR)/debug/%.o: src/%.cpp | makedirs
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	$(COMPILE.cc) $(OUTPUT_OPTION) $<

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$(BUILD_DIR)/javascript/%.js.bc: src/%.c | makedirs
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	$(EMCC.c) $(OUTPUT_OPTION) $<

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$(BUILD_DIR)/javascript/%.js.bc: src/%.cpp | makedirs
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	$(EMCC.cc) $(OUTPUT_OPTION) $<

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$(BUILD_DIR)/tests/%: tests/%.c $(DEBUG_OBJECTS)
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	$(LINK.c) $< $(DEBUG_OBJECTS) $(LOADLIBES) $(LDLIBS) -o $@
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$(BUILD_DIR)/tests/%: tests/%.cpp $(DEBUG_OBJECTS)
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	$(LINK.cc) $< $(DEBUG_OBJECTS) $(LOADLIBES) $(LDLIBS) -o $@
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$(BUILD_DIR)/fuzzers/objects/%.o: src/%.c | makedirs
	$(AFL.c) $(OUTPUT_OPTION) $<

$(BUILD_DIR)/fuzzers/objects/%.o: src/%.cpp | makedirs
	$(AFL.cc) $(OUTPUT_OPTION) $<

$(BUILD_DIR)/fuzzers/fuzz_%: fuzzers/fuzz_%.c $(FUZZER_OBJECTS)
	$(AFL_LINK.c) $< $(FUZZER_OBJECTS) $(LOADLIBES) $(LDLIBS) -o $@

$(BUILD_DIR)/fuzzers/fuzz_%: fuzzers/fuzz_%.cpp $(FUZZER_OBJECTS)
	$(AFL_LINK.cc) $< $(FUZZER_OBJECTS) $(LOADLIBES) $(LDLIBS) -o $@

$(BUILD_DIR)/fuzzers/debug_%: fuzzers/fuzz_%.c $(DEBUG_OBJECTS)
	$(LINK.c) $< $(DEBUG_OBJECTS) $(LOADLIBES) $(LDLIBS) -o $@

$(BUILD_DIR)/fuzzers/debug_%: fuzzers/fuzz_%.cpp $(DEBUG_OBJECTS)
	$(LINK.cc) $< $(DEBUG_OBJECTS) $(LOADLIBES) $(LDLIBS) -o $@
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### dependencies

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-include $(RELEASE_OBJECTS:.o=.d)
-include $(DEBUG_OBJECTS:.o=.d)
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-include $(JS_OBJECTS:.bc=.d)
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-include $(TEST_BINARIES:=.d)
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-include $(FUZZER_OBJECTS:.o=.d)
-include $(FUZZER_BINARIES:=.d)
-include $(FUZZER_DEBUG_BINARIES:=.d)