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#!/usr/bin/make -f

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MAJOR := 2
MINOR := 0
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PATCH := 0
VERSION := $(MAJOR).$(MINOR).$(PATCH)
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PREFIX ?= /usr/local
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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
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AFL_CXX = afl-g++
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RELEASE_TARGET := $(BUILD_DIR)/libolm.so.$(VERSION)
DEBUG_TARGET := $(BUILD_DIR)/libolm_debug.so.$(VERSION)
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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 include/olm/outbound_group_session.h include/olm/inbound_group_session.h
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SOURCES := $(wildcard src/*.cpp) $(wildcard src/*.c) \
    lib/crypto-algorithms/sha256.c \
    lib/crypto-algorithms/aes.c \
    lib/curve25519-donna/curve25519-donna.c

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FUZZER_SOURCES := $(wildcard fuzzers/fuzz_*.cpp) $(wildcard fuzzers/fuzz_*.c)
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TEST_SOURCES := $(wildcard tests/test_*.cpp) $(wildcard tests/test_*.c)
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OBJECTS := $(patsubst %.c,%.o,$(patsubst %.cpp,%.o,$(SOURCES)))
RELEASE_OBJECTS := $(addprefix $(BUILD_DIR)/release/,$(OBJECTS))
DEBUG_OBJECTS := $(addprefix $(BUILD_DIR)/debug/,$(OBJECTS))
FUZZER_OBJECTS := $(addprefix $(BUILD_DIR)/fuzzers/objects/,$(OBJECTS))
FUZZER_BINARIES := $(addprefix $(BUILD_DIR)/,$(basename $(FUZZER_SOURCES)))
FUZZER_DEBUG_BINARIES := $(patsubst $(BUILD_DIR)/fuzzers/fuzz_%,$(BUILD_DIR)/fuzzers/debug_%,$(FUZZER_BINARIES))
TEST_BINARIES := $(patsubst tests/%,$(BUILD_DIR)/tests/%,$(basename $(TEST_SOURCES)))
JS_OBJECTS := $(addprefix $(BUILD_DIR)/javascript/,$(OBJECTS))
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JS_PRE := $(wildcard javascript/*pre.js)
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JS_POST := javascript/olm_outbound_group_session.js \
    javascript/olm_inbound_group_session.js \
    javascript/olm_post.js
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DOCS := tracing/README.html \
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    docs/megolm.html \
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    docs/olm.html \
    README.html \
    CHANGELOG.html
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CPPFLAGS += -Iinclude -Ilib \
    -DOLMLIB_VERSION_MAJOR=$(MAJOR) -DOLMLIB_VERSION_MINOR=$(MINOR) \
    -DOLMLIB_VERSION_PATCH=$(PATCH)

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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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$(RELEASE_TARGET): $(RELEASE_OBJECTS)
	$(CXX) $(LDFLAGS) --shared -fPIC \
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            -Wl,-soname,libolm.so.$(MAJOR) \
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            -Wl,--version-script,version_script.ver \
            $(OUTPUT_OPTION) $(RELEASE_OBJECTS)
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	ln -sf libolm.so.$(VERSION) $(BUILD_DIR)/libolm.so.$(MAJOR)
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debug: $(DEBUG_TARGET)
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.PHONY: debug

$(DEBUG_TARGET): $(DEBUG_OBJECTS)
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	$(CXX) $(LDFLAGS) --shared -fPIC \
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            -Wl,-soname,libolm_debug.so.$(MAJOR) \
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            -Wl,--version-script,version_script.ver \
            $(OUTPUT_OPTION) $(DEBUG_OBJECTS)
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	ln -sf libolm_debug.so.$(VERSION) $(BUILD_DIR)/libolm_debug.so.$(MAJOR)
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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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               $(foreach f,$(JS_PRE),--pre-js $(f)) \
               $(foreach f,$(JS_POST),--post-js $(f)) \
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               -s "EXPORTED_FUNCTIONS=@$(JS_EXPORTED_FUNCTIONS)" \
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               $(JS_OBJECTS) -o $@

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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)
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	perl -MJSON -ne '$$f{"_$$1"}=1 if /(olm_[^( ]*)\(/; END { @f=sort keys %f; print encode_json \@f }' $^ > $@.tmp
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	mv $@.tmp $@

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all: test js lib debug doc
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.PHONY: all

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install-headers: $(PUBLIC_HEADERS)
	test -d $(DESTDIR)$(PREFIX)/include/olm || mkdir -p $(DESTDIR)$(PREFIX)/include/olm
	install -Dm644 $(PUBLIC_HEADERS) $(DESTDIR)$(PREFIX)/include/olm/
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.PHONY: install-headers
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install-debug: debug install-headers
	test -d $(DESTDIR)$(PREFIX)/lib || mkdir -p $(DESTDIR)$(PREFIX)/lib
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	install -Dm755 $(DEBUG_TARGET) $(DESTDIR)$(PREFIX)/lib/libolm_debug.so.$(VERSION)
	ln -s libolm_debug.so.$(VERSION) $(DESTDIR)$(PREFIX)/lib/libolm_debug.so.$(MAJOR)
	ln -s libolm_debug.so.$(VERSION) $(DESTDIR)$(PREFIX)/lib/libolm_debug.so
.PHONY: install-debug

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install: lib install-headers
	test -d $(DESTDIR)$(PREFIX)/lib || mkdir -p $(DESTDIR)$(PREFIX)/lib
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	install -Dm755 $(RELEASE_TARGET) $(DESTDIR)$(PREFIX)/lib/libolm.so.$(VERSION)
	ln -s libolm.so.$(VERSION) $(DESTDIR)$(PREFIX)/lib/libolm.so.$(MAJOR)
	ln -s libolm.so.$(VERSION) $(DESTDIR)$(PREFIX)/lib/libolm.so
.PHONY: install

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clean:;
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	rm -rf $(BUILD_DIR) $(DOCS)
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.PHONY: clean
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doc: $(DOCS)
.PHONY: doc

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### rules for building objects
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$(BUILD_DIR)/release/%.o: %.c
	mkdir -p $(dir $@)
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	$(COMPILE.c) $(OUTPUT_OPTION) $<

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$(BUILD_DIR)/release/%.o: %.cpp
	mkdir -p $(dir $@)
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	$(COMPILE.cc) $(OUTPUT_OPTION) $<

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$(BUILD_DIR)/debug/%.o: %.c
	mkdir -p $(dir $@)
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	$(COMPILE.c) $(OUTPUT_OPTION) $<

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$(BUILD_DIR)/debug/%.o: %.cpp
	mkdir -p $(dir $@)
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	$(COMPILE.cc) $(OUTPUT_OPTION) $<

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$(BUILD_DIR)/javascript/%.o: %.c
	mkdir -p $(dir $@)
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	$(EMCC.c) $(OUTPUT_OPTION) $<

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$(BUILD_DIR)/javascript/%.o: %.cpp
	mkdir -p $(dir $@)
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	$(EMCC.cc) $(OUTPUT_OPTION) $<

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$(BUILD_DIR)/tests/%: tests/%.c $(DEBUG_OBJECTS)
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	mkdir -p $(dir $@)
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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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	mkdir -p $(dir $@)
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	$(LINK.cc) $< $(DEBUG_OBJECTS) $(LOADLIBES) $(LDLIBS) -o $@
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$(BUILD_DIR)/fuzzers/objects/%.o: %.c
	mkdir -p $(dir $@)
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	$(AFL.c) $(OUTPUT_OPTION) $<

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$(BUILD_DIR)/fuzzers/objects/%.o: %.cpp
	mkdir -p $(dir $@)
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	$(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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%.html: %.rst
	rst2html $< $@

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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:.o=.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)