CMakeLists.txt

cmake_minimum_required (VERSION 3.0)
project (s2n C)

if(POLICY CMP0077)
    cmake_policy(SET CMP0077 NEW) #option does nothing when a normal variable of the same name exists.
endif()

set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib)
set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib)
set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/bin)
set(INSTALL_LIB_DIR lib CACHE PATH "Installation directory for libraries")
set(INSTALL_INCLUDE_DIR include CACHE PATH "Installation directory for header files")
set(INSTALL_CMAKE_DIR lib/cmake CACHE PATH "Installation directory for cmake files")

set(CMAKE_FIND_PACKAGE_PREFER_CONFIG TRUE)

# These Version numbers are for major updates only- we won't track minor/patch updates here.
set(VERSION_MAJOR 1)
set(VERSION_MINOR 0)
set(VERSION_PATCH 0)

option(SEARCH_LIBCRYPTO "Set this if you want to let S2N search libcrypto for you,
otherwise a crypto target needs to be defined." ON)
option(UNSAFE_TREAT_WARNINGS_AS_ERRORS "Compiler warnings are treated as errors. Warnings may
indicate danger points where you should verify with the S2N-TLS developers that the security of
the library is not compromised. Turn this OFF to ignore warnings." ON)
option(S2N_WERROR_ALL "This option will cause all artifacts linked to libs2n to use the 
-Werror setting." OFF)
option(S2N_INTERN_LIBCRYPTO "This ensures that s2n-tls is compiled and deployed with a specific
version of libcrypto by interning the code and hiding symbols. This also enables s2n-tls to be
loaded in an application with an otherwise conflicting libcrypto version." OFF)
option(S2N_LTO, "Enables link time optimizations when building s2n-tls." OFF)
option(S2N_STACKTRACE "Enables stacktrace functionality in s2n-tls. Note that this functionality is
only available on platforms that support execinfo." ON)
option(COVERAGE "Enable profiling collection for code coverage calculation" OFF)
option(S2N_INTEG_TESTS "Enable the integrationv2 tests" OFF)
option(S2N_FAST_INTEG_TESTS "Enable the integrationv2 with more parallelism, only has effect if S2N_INTEG_TESTS=ON" ON)
option(S2N_INSTALL_S2NC_S2ND "Install the binaries s2nc and s2nd" OFF)
option(S2N_USE_CRYPTO_SHARED_LIBS "For S2N to use shared libs in Findcrypto" OFF)
option(TSAN "Enable ThreadSanitizer to test thread safety" OFF)
option(ASAN "Enable AddressSanitizer to test memory safety" OFF)
option(SECCOMP "Link with seccomp and run seccomp tests" OFF)

# Turn BUILD_TESTING=ON by default
include(CTest)

file(GLOB API_HEADERS "api/*.h")
file(GLOB API_UNSTABLE_HEADERS "api/unstable/*.h")

file(GLOB CRYPTO_HEADERS "crypto/*.h")
file(GLOB CRYPTO_SRC "crypto/*.c")

file(GLOB ERROR_HEADERS "error/*.h")
file(GLOB ERROR_SRC "error/*.c")

file(GLOB STUFFER_HEADERS "stuffer/*.h")
file(GLOB STUFFER_SRC "stuffer/*.c")

file(GLOB_RECURSE TLS_HEADERS "tls/*.h")
file(GLOB_RECURSE TLS_SRC "tls/*.c")

file(GLOB UTILS_HEADERS "utils/*.h")
file(GLOB UTILS_SRC "utils/*.c")

message(STATUS "Detected CMAKE_SYSTEM_PROCESSOR as ${CMAKE_SYSTEM_PROCESSOR}")

if(CMAKE_SIZEOF_VOID_P EQUAL 4)
  message(STATUS "Detected 32-Bit system")
else()
    message(STATUS "Detected 64-Bit system")
endif()

##be nice to visual studio users
if(MSVC)
    source_group("Header Files\\s2n\\api" FILES ${API_HEADERS} ${API_UNSTABLE_HEADERS})
    source_group("Header Files\\s2n\\crypto" FILES ${CRYPTO_HEADERS})
    source_group("Header Files\\s2n\\error" FILES ${ERROR_HEADERS})
    source_group("Header Files\\s2n\\stuffer" FILES ${STUFFER_HEADERS})
    source_group("Header Files\\s2n\\tls" FILES ${TLS_HEADERS})
    source_group("Header Files\\s2n\\utils" FILES ${UTILS_HEADERS})

    source_group("Source Files\\crypto" FILES ${CRYPTO_SRC})
    source_group("Source Files\\error" FILES ${ERROR_SRC})
    source_group("Source Files\\stuffer" FILES ${STUFFER_SRC})
    source_group("Source Files\\tls" FILES ${TLS_SRC})
    source_group("Source Files\\utils" FILES ${UTILS_SRC})
else()
    set(THREADS_PREFER_PTHREAD_FLAG ON)
    find_package(Threads REQUIRED)
endif()

if(APPLE)
    set(OS_LIBS c Threads::Threads)
elseif(CMAKE_SYSTEM_NAME STREQUAL "FreeBSD")
    set(OS_LIBS thr execinfo)
elseif(CMAKE_SYSTEM_NAME STREQUAL "NetBSD")
    set(OS_LIBS Threads::Threads)
elseif(CMAKE_SYSTEM_NAME STREQUAL "OpenBSD")
    set(OS_LIBS Threads::Threads kvm)
elseif(CMAKE_SYSTEM_NAME STREQUAL "Android")
    set(OS_LIBS Threads::Threads dl)
else()
    set(OS_LIBS Threads::Threads dl rt)
endif()

# Compiling the unit tests rely on S2N_TEST_IN_FIPS_MODE to be set correctly
if(S2N_FIPS)
    add_definitions(-DS2N_TEST_IN_FIPS_MODE)
endif()

file(GLOB S2N_HEADERS
    ${API_HEADERS}
    ${API_UNSTABLE_HEADERS}
    ${CRYPTO_HEADERS}
    ${ERROR_HEADERS}
    ${STUFFER_HEADERS}
    ${TLS_HEADERS}
    ${UTILS_HEADERS}
)

file(GLOB S2N_SRC
    ${CRYPTO_SRC}
    ${ERROR_SRC}
    ${STUFFER_SRC}
    ${TLS_SRC}
    ${UTILS_SRC}
)

add_library(${PROJECT_NAME} ${S2N_HEADERS} ${S2N_SRC})
set_target_properties(${PROJECT_NAME} PROPERTIES LINKER_LANGUAGE C)

# Version numbers are for major updates only- we won't track minor/patch updates here.
set_target_properties(${PROJECT_NAME} PROPERTIES VERSION ${VERSION_MAJOR}.${VERSION_MINOR}.${VERSION_PATCH})
set_target_properties(${PROJECT_NAME} PROPERTIES SOVERSION ${VERSION_MAJOR})

set(CMAKE_C_FLAGS_DEBUGOPT "")

target_compile_options(${PROJECT_NAME} PRIVATE 
    -pedantic
    -std=gnu99
    -Wall
    -Wcast-align
    -Wchar-subscripts
    -Wcomment
    -Wformat-security
    -Wimplicit
    -Wshadow
    -Wsign-compare
    -Wuninitialized
    -Wunused
    -Wwrite-strings
    
    # Assembler Options
    -Wa,--noexecstack

    # Suppressed Warnings
    -Wno-deprecated-declarations
    # GCC 4 fails to parse our macros with a "missing-braces" error
    -Wno-missing-braces
    -Wno-strict-prototypes
    -Wno-unknown-pragmas
)

if (S2N_WERROR_ALL)
    target_compile_options(${PROJECT_NAME} PUBLIC -Werror)
elseif (UNSAFE_TREAT_WARNINGS_AS_ERRORS)
    target_compile_options(${PROJECT_NAME} PRIVATE -Werror )
endif ()

if(BUILD_TESTING AND BUILD_SHARED_LIBS OR S2N_FUZZ_TEST)
    target_compile_options(${PROJECT_NAME} PRIVATE -fvisibility=default)
else()
    target_compile_options(${PROJECT_NAME} PRIVATE -fvisibility=hidden -DS2N_EXPORTS)
endif()

if(S2N_LTO)
    target_compile_options(${PROJECT_NAME} PRIVATE -flto)
    # if we're building a static lib, make it easier for consuming applications to also perform LTO
    if(NOT BUILD_SHARED_LIBS)
        target_compile_options(${PROJECT_NAME} PRIVATE -ffunction-sections -fdata-sections)
    endif()
endif()

if(NOT APPLE)
    set(CMAKE_SHARED_LINKER_FLAGS -Wl,-z,noexecstack,-z,relro,-z,now)
endif()

# Whether to fail the build when compiling s2n's portable C code with non-portable assembly optimizations. Doing this
# can lead to runtime crashes if build artifacts are built on modern hardware, but deployed to older hardware without
# newer CPU instructions. s2n, by default, should be backwards compatible with older CPU types so this flag should be
# enabled in s2n's CI builds and tests, but other consumers of s2n may have stronger control of what CPU types they
# deploy to, and can enable more CPU optimizations.
if(S2N_BLOCK_NONPORTABLE_OPTIMIZATIONS)
    target_compile_options(${PROJECT_NAME} PUBLIC -DS2N_BLOCK_NONPORTABLE_OPTIMIZATIONS=1)
endif()

target_compile_options(${PROJECT_NAME} PUBLIC -fPIC)

add_definitions(-D_POSIX_C_SOURCE=200809L)
if(CMAKE_BUILD_TYPE MATCHES Release)
    add_definitions(-D_FORTIFY_SOURCE=2)
endif()

if(NO_STACK_PROTECTOR)
    target_compile_options(${PROJECT_NAME} PRIVATE -Wstack-protector -fstack-protector-all)
endif()

if(S2N_FUZZ_TEST)
    target_compile_options(${PROJECT_NAME} PUBLIC -fsanitize=fuzzer-no-link,leak)
    target_link_libraries(${PROJECT_NAME} PUBLIC -fsanitize=fuzzer-no-link,leak)
endif()

if(TSAN)
    target_compile_options(${PROJECT_NAME} PUBLIC -fsanitize=thread -DS2N_THREAD_SANITIZER=1)
    target_link_options(${PROJECT_NAME} PUBLIC -fsanitize=thread)
endif()

if(ASAN)
    target_compile_options(${PROJECT_NAME} PUBLIC -fsanitize=address -DS2N_ADDRESS_SANITIZER=1)
    target_link_options(${PROJECT_NAME} PUBLIC -fsanitize=address)
endif()

if (UBSAN)
    target_compile_options(${PROJECT_NAME} PUBLIC -fsanitize=undefined -fno-sanitize-recover=all)
    target_link_options(${PROJECT_NAME} PUBLIC -fsanitize=undefined -fno-sanitize-recover=all)
endif()

if(TSAN OR ASAN OR UBSAN)
    # no-omit-frame-pointer and no-optimize-sibling-calls provide better stack traces
    target_compile_options(${PROJECT_NAME} PUBLIC -fno-omit-frame-pointer -fno-optimize-sibling-calls)
endif()

list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake/modules")

if (NOT $ENV{S2N_LIBCRYPTO} MATCHES "awslc")
    # add cast-qual back in for non AWS-LC
    target_compile_options(${PROJECT_NAME} PRIVATE -Wcast-qual)
endif()

if (COVERAGE)
    # https://cmake.org/cmake/help/latest/variable/CMAKE_LANG_COMPILER_ID.html
    # Coverage is done using LLVM source based coverage. This is only supported
    # on LLVM compilers. GCC would fail with "unrecognized compile options"
    # on -fprofile-instr-generate -fcoverage-mapping flags.
    if (NOT ${CMAKE_C_COMPILER_ID} MATCHES Clang)
        message(FATAL_ERROR "This project requires clang for coverage support")
    endif()
    target_compile_options(${PROJECT_NAME} PUBLIC -fprofile-instr-generate -fcoverage-mapping)
    target_link_options(${PROJECT_NAME} PUBLIC -fprofile-instr-generate -fcoverage-mapping)
endif()

# For interning, we need to find the static libcrypto library. Cmake configs
# can branch on the variable BUILD_SHARED_LIBS to e.g. avoid having to define
# multiple targets. An example is AWS-LC:
# https://github.com/awslabs/aws-lc/blob/main/crypto/cmake/crypto-config.cmake#L5
if (S2N_INTERN_LIBCRYPTO)
    set(BUILD_SHARED_LIBS_BACKUP ${BUILD_SHARED_LIBS})
    set(BUILD_SHARED_LIBS OFF)
endif()

# Work around target differences
if (TARGET crypto)
    message(STATUS "S2N found target: crypto")
    set(LINK_LIB "crypto")
else()
    find_package(crypto REQUIRED)
    message(STATUS "Using libcrypto from the cmake path")
    set(LINK_LIB "AWS::crypto")
endif()

if (S2N_INTERN_LIBCRYPTO)
    # Restore the old BUILD_SHARED_LIBS value
    set(BUILD_SHARED_LIBS ${BUILD_SHARED_LIBS_BACKUP})
    message(STATUS "Enabling libcrypto interning")
endif()

if (NOT DEFINED CMAKE_AR)
    message(STATUS "CMAKE_AR undefined, setting to `ar` by default")
    SET(CMAKE_AR ar)
else()
    message(STATUS "CMAKE_AR found: ${CMAKE_AR}")
endif()

if (NOT DEFINED CMAKE_RANLIB)
    message(STATUS "CMAKE_RANLIB undefined, setting to `ranlib` by default")
    SET(CMAKE_RANLIB ranlib)
else()
    message(STATUS "CMAKE_RANLIB found: ${CMAKE_RANLIB}")
endif()

if (NOT DEFINED CMAKE_OBJCOPY)
    message(STATUS "CMAKE_OBJCOPY undefined, setting to `objcopy` by default")
    SET(CMAKE_OBJCOPY objcopy)
else()
    message(STATUS "CMAKE_OBJCOPY found: ${CMAKE_OBJCOPY}")
endif()

# Sets the result of the feature probe to `IS_AVAILABLE`
function(feature_probe_result PROBE_NAME IS_AVAILABLE)
    # normalize the boolean value
    if(IS_AVAILABLE)
        set(NORMALIZED TRUE)
    else()
        set(NORMALIZED FALSE)
    endif()

    # indicate the status of the probe
    message(STATUS "feature ${PROBE_NAME}: ${NORMALIZED}")
    # set the probe result in the parent scope for other probes
    set(${PROBE_NAME} ${NORMALIZED} PARENT_SCOPE)

    # define the probe if available
    if(NORMALIZED)
        add_definitions(-D${PROBE_NAME})
    endif()
endfunction()

# Tries to compile a feature probe and initializes the corresponding flags
function(feature_probe PROBE_NAME)
    # Load the global probe flags
    file(READ "${CMAKE_CURRENT_LIST_DIR}/tests/features/GLOBAL.flags" GLOBAL_FILE)
    string(REPLACE "\n" "" GLOBAL_FLAGS "${GLOBAL_FILE}")

    # Load the probe's flags
    file(READ "${CMAKE_CURRENT_LIST_DIR}/tests/features/${PROBE_NAME}.flags" PROBE_FILE)
    string(REPLACE "\n" "" PROBE_FLAGS "${PROBE_FILE}")

    # Try to compile the probe with the given flags
    try_compile(
        IS_AVAILABLE
        ${CMAKE_BINARY_DIR}
        SOURCES "${CMAKE_CURRENT_LIST_DIR}/tests/features/${PROBE_NAME}.c"
        LINK_LIBRARIES ${LINK_LIB} ${OS_LIBS}
        CMAKE_FLAGS ${ADDITIONAL_FLAGS}
        COMPILE_DEFINITIONS -c ${GLOBAL_FLAGS} ${PROBE_FLAGS}
        ${ARGN}
        OUTPUT_VARIABLE TRY_COMPILE_OUTPUT
    )
    # Uncomment the line below to get the output of the try_compile command
    #message(STATUS "Output of try_compile: ${TRY_COMPILE_OUTPUT}")

    # Set the result of the probe
    feature_probe_result(${PROBE_NAME} ${IS_AVAILABLE})

    # Make sure the variable is set in the parent scope
    set(${PROBE_NAME} ${IS_AVAILABLE} PARENT_SCOPE)

    # Set the flags that we used for the probe
    set(${PROBE_NAME}_FLAGS ${PROBE_FLAGS} PARENT_SCOPE)
endfunction()

# Iterate over all of the features and try to compile them
FILE(GLOB FEATURE_SRCS "${CMAKE_CURRENT_LIST_DIR}/tests/features/*.c")
list(SORT FEATURE_SRCS)
foreach(file ${FEATURE_SRCS})
    get_filename_component(feature_name ${file} NAME_WE)
    feature_probe(${feature_name})
endforeach()

# FreeBSD might need to link to execinfo explicitly
if(NOT S2N_EXECINFO_AVAILABLE AND CMAKE_SYSTEM_NAME STREQUAL "FreeBSD")
    feature_probe(S2N_EXECINFO_AVAILABLE LINK_LIBRARIES execinfo)
endif()

# Stack traces are only available if execinfo is
if (NOT S2N_EXECINFO_AVAILABLE)
    set(S2N_STACKTRACE FALSE)
endif()
feature_probe_result(S2N_STACKTRACE ${S2N_STACKTRACE})

if (S2N_INTERN_LIBCRYPTO)

    # Check if the AWS::crypto target has beeen added and handle it
    if (TARGET AWS::crypto)
        # Get the target library type (shared or static)
        get_target_property(target_type AWS::crypto TYPE)
        message(STATUS "AWS::crypto target type: ${target_type}")

        # If we didn't find the a target with static library type, fallback to
        # existing crypto_STATIC_LIBRARY and crypto_INCLUDE_DIR
        if (target_type STREQUAL STATIC_LIBRARY)
            # We need an path to the include directory and libcrypto.a archive.
            # The finder module defines these appropriately, but if we go through
            # the target config we need to query this information from the target
            # first.
            get_target_property(crypto_STATIC_LIBRARY AWS::crypto LOCATION)
            get_target_property(crypto_INCLUDE_DIR AWS::crypto INTERFACE_INCLUDE_DIRECTORIES)
        endif()
    endif()

    if (NOT crypto_STATIC_LIBRARY)
        message(FATAL_ERROR "libcrypto interning requires a static build of libcrypto.a to be available")
    endif()

    message(STATUS "crypto_STATIC_LIBRARY: ${crypto_STATIC_LIBRARY}")
    message(STATUS "crypto_INCLUDE_DIR: ${crypto_INCLUDE_DIR}")

    # Don't call link_target_libraries here, just make sure the libcrypto include dir is in the path
    include_directories("${crypto_INCLUDE_DIR}")

    add_custom_command(
        OUTPUT libcrypto.symbols
        COMMAND
          # copy the static version of libcrypto
          cp ${crypto_STATIC_LIBRARY} s2n_libcrypto.a &&
          # dump all of the symbols and prefix them with `s2n$`
          bash -c "${CMAKE_NM} s2n_libcrypto.a | awk '/ [A-Z] /{print $3\" s2n$\"$3}' | sort | uniq > libcrypto.symbols" &&
          # redefine the libcrypto libary symbols
          ${CMAKE_OBJCOPY} --redefine-syms libcrypto.symbols s2n_libcrypto.a &&
          rm -rf s2n_libcrypto &&
          mkdir s2n_libcrypto &&
          cd s2n_libcrypto &&
          # extract libcrypto objects from the archive
          ${CMAKE_AR} x ../s2n_libcrypto.a &&
          # rename all of the object files so we don't have any object name collisions
          bash -c "find . -name '*.o' -type f -print0 | xargs -0 -n1 -- basename | xargs -I{} mv {} s2n_crypto__{}"
        VERBATIM
    )

    add_custom_target(s2n_libcrypto ALL
      DEPENDS libcrypto.symbols
    )
    add_dependencies(${PROJECT_NAME} s2n_libcrypto)
    add_definitions(-DS2N_INTERN_LIBCRYPTO)

    if ((BUILD_SHARED_LIBS AND BUILD_TESTING) OR NOT BUILD_SHARED_LIBS)
        # if libcrypto needs to be interned, rewrite libcrypto references so use of internal functions will link correctly
        add_custom_command(
            TARGET ${PROJECT_NAME} PRE_LINK
            COMMAND
              find "${CMAKE_CURRENT_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/${PROJECT_NAME}.dir" -name '*.c.o' -exec objcopy --redefine-syms libcrypto.symbols {} \\\;
        )
    endif()

    # copy the static libcrypto into the final artifact
    if (BUILD_SHARED_LIBS)
        if (BUILD_TESTING)
            # if we're building tests, we export the prefixed symbols so tests can link to them
            set_target_properties(${PROJECT_NAME} PROPERTIES LINK_FLAGS
                "-Wl,--whole-archive s2n_libcrypto.a -Wl,--no-whole-archive")
        else()
            # if we're not building tests, then just copy the original archive, unmodified
            set_target_properties(${PROJECT_NAME} PROPERTIES LINK_FLAGS
                "-Wl,--whole-archive ${crypto_STATIC_LIBRARY} -Wl,--no-whole-archive -Wl,--exclude-libs=ALL")
        endif()
    else()
        # add all of the prefixed symbols to the archive
        add_custom_command(
            TARGET ${PROJECT_NAME} POST_BUILD
            DEPENDS libcrypto.symbols
            COMMAND
                bash -c "${CMAKE_AR} -r lib/libs2n.a s2n_libcrypto/*.o"
            VERBATIM
        )
    endif()
else()
    # LINK_LIB is set above after checking targets. It handles the find_package craziness.
    target_link_libraries(${PROJECT_NAME} PUBLIC ${LINK_LIB})
endif()

target_link_libraries(${PROJECT_NAME} PUBLIC ${OS_LIBS} m)

target_include_directories(${PROJECT_NAME} PUBLIC $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}>)
target_include_directories(${PROJECT_NAME} PUBLIC $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/api> $<INSTALL_INTERFACE:include>)

if (BUILD_TESTING)
    enable_testing()

    ############################################################################
    ################### build testlib (utility library) ########################
    ############################################################################

    file(GLOB TESTLIB_SRC "tests/testlib/*.c")
    file(GLOB EXAMPLES_SRC "docs/examples/*.c")

    add_library(testss2n STATIC ${TESTLIB_SRC} ${EXAMPLES_SRC})
    target_include_directories(testss2n PUBLIC tests)
    target_compile_options(testss2n PRIVATE -std=gnu99)
    target_link_libraries(testss2n PUBLIC ${PROJECT_NAME})
    if (SECCOMP)
        message(STATUS "Linking tests with seccomp")
        target_link_libraries(testss2n PRIVATE seccomp)
        target_compile_definitions(testss2n PRIVATE SECCOMP)
    endif()

    if (S2N_INTERN_LIBCRYPTO)
        # if libcrypto was interned, rewrite libcrypto symbols so use of internal
        # functions will link correctly
        add_custom_command(
            TARGET testss2n POST_BUILD
            COMMAND
                objcopy --redefine-syms libcrypto.symbols lib/libtestss2n.a
        )
    endif()

    ############################################################################
    ########################## configure unit tests ############################
    ############################################################################

    set(UNIT_TEST_ENVS S2N_DONT_MLOCK=1)
    if (TSAN OR ASAN)
        set(UNIT_TEST_ENVS ${UNIT_TEST_ENVS} S2N_ADDRESS_SANITIZER=1)
    endif()
    if(TSAN)
        set(TSAN_SUPPRESSIONS_FILE ${CMAKE_SOURCE_DIR}/tests/.tsan_suppressions)
        if(NOT EXISTS ${TSAN_SUPPRESSIONS_FILE})
            message(FATAL_ERROR "TSAN suppression file ${TSAN_SUPPRESSIONS_FILE} missing")
        endif()
        set(TSAN_OPTIONS suppressions=${TSAN_SUPPRESSIONS_FILE})
        if(DEFINED ENV{TSAN_OPTIONS})
            set(TSAN_OPTIONS "${TSAN_OPTIONS} $ENV{TSAN_OPTIONS}")
        endif()
        set(UNIT_TEST_ENVS ${UNIT_TEST_ENVS} TSAN_OPTIONS=${TSAN_OPTIONS})
    endif()
    if(ASAN)
        # "detect_odr_violation" detects violations of the "one definition rule",
        # ensuring that symbols are only defined once.
        # But some of our unit tests intentionally include *.c files for testing,
        # resulting in duplicate global values.
        set(ASAN_OPTIONS detect_odr_violation=0)
        if(DEFINED ENV{ASAN_OPTIONS})
            set(ASAN_OPTIONS "${ASAN_OPTIONS} $ENV{ASAN_OPTIONS}")
        endif()
        set(UNIT_TEST_ENVS ${UNIT_TEST_ENVS} ASAN_OPTIONS=${ASAN_OPTIONS})
    endif()
    message(STATUS "Running tests with environment: ${UNIT_TEST_ENVS}")

    ############################################################################
    ############################ build unit tests ##############################
    ############################################################################

    file(GLOB UNITTESTS_SRC "tests/unit/*.c")
    foreach(test_case ${UNITTESTS_SRC})
        # NAME_WE: name without extension
        get_filename_component(test_case_name ${test_case} NAME_WE)

        add_executable(${test_case_name} ${test_case})
        target_link_libraries(${test_case_name} PRIVATE testss2n)
        if (S2N_INTERN_LIBCRYPTO)
            # if libcrypto was interned, rewrite libcrypto symbols so use of internal functions will link correctly
            add_custom_command(
                TARGET ${test_case_name} PRE_LINK
                COMMAND
                  find . -name '${test_case_name}.c.o' -exec objcopy --redefine-syms libcrypto.symbols {} \\\;
            )
        endif()
        target_compile_options(${test_case_name} PRIVATE 
            -Wall -Wimplicit -Wunused -Wcomment -Wchar-subscripts -Wuninitialized 
            -Wshadow  -Wcast-align -Wwrite-strings -Wformat-security
            -Wno-deprecated-declarations -Wno-unknown-pragmas -Wno-deprecated -std=gnu99
        )
        if (S2N_LTO)
            target_compile_options(${test_case_name} PRIVATE -flto)
        endif()

        add_test(
            NAME ${test_case_name} 
            COMMAND $<TARGET_FILE:${test_case_name}> 
            WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/tests/unit
        )
        set_property(TEST ${test_case_name} PROPERTY LABELS "unit")
        set_property(TEST ${test_case_name} PROPERTY ENVIRONMENT ${UNIT_TEST_ENVS})

    endforeach(test_case)

    ############################################################################
    ######################### build utility binaries ###########################
    ############################################################################

    add_executable(s2nc "bin/s2nc.c" "bin/echo.c" "bin/https.c" "bin/common.c")
    target_link_libraries(s2nc ${PROJECT_NAME})
    target_compile_options(s2nc PRIVATE -std=gnu99)

    add_executable(s2nd "bin/s2nd.c" "bin/echo.c" "bin/https.c" "bin/common.c")
    target_link_libraries(s2nd ${PROJECT_NAME})
    target_compile_options(s2nd PRIVATE -std=gnu99)

    add_executable(policy "bin/policy.c")
    target_link_libraries(policy ${PROJECT_NAME})
    target_compile_options(policy PRIVATE -std=gnu99)

    if(S2N_LTO)
        target_compile_options(s2nc PRIVATE -flto)
        target_compile_options(s2nd PRIVATE -flto)
    endif()

    if (S2N_INTEG_TESTS)
        find_package (Python3 COMPONENTS Interpreter Development)
        file(GLOB integv2_test_files "${PROJECT_SOURCE_DIR}/tests/integrationv2/test_*.py")
        set(N 1)
        if (S2N_FAST_INTEG_TESTS)
            set(N auto)
        endif()
        foreach(test_file_path ${integv2_test_files})
            get_filename_component(test_filename ${test_file_path} NAME_WE)
            string(REGEX REPLACE "^test_" "integrationv2_" test_target ${test_filename})
            if (S2N_INTEG_NIX)
                # For Nix and environments where LD_LIBRARY_PATH is already correct.
                # We're also dropping tox and calling pytest directly, because
                # Nix is already handling all of the python setup.
                if (CMAKE_SYSTEM_PROCESSOR STREQUAL "aarch64" AND ${test_target} STREQUAL "integrationv2_sslyze" )
                  # sslyze/nassl is not available on aarch64.
                  message(WARNING "Skipping ${test_target} due to missing tools on ${CMAKE_SYSTEM_PROCESSOR}")
                  continue()
                endif()
                message(STATUS "Adding integ test ${test_target}")
                add_test(NAME ${test_target}
                        COMMAND
                        pytest
                        -x -n=${N} --reruns=2 --durations=10 --cache-clear -rpfsq
                        -o log_cli=true --log-cli-level=DEBUG --provider-version=$ENV{S2N_LIBCRYPTO}
                        --provider-criterion=off --fips-mode=0 ${test_file_path}
                        WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}/tests/integrationv2
                )
            else()
                # For use with libcryptos built into test-deps, and not in LD_LIBRARY_PATH.
                # This is a duplication of tests/integrationv2/Makefile and
                # can go away once all the Nix porting is finished.
                add_test(NAME ${test_target}
                        COMMAND
                        ${CMAKE_COMMAND} -E env
                        DYLD_LIBRARY_PATH=${PROJECT_SOURCE_DIR}/libcrypto-root/lib:$ENV{DYLD_LIBRARY_PATH}
                        LD_LIBRARY_PATH=${PROJECT_SOURCE_DIR}/libcrypto-root/lib:${PROJECT_SOURCE_DIR}/test-deps/openssl-1.1.1/lib:${PROJECT_SOURCE_DIR}/test-deps/gnutls37/nettle/lib:$ENV{LD_LIBRARY_PATH}
                        PATH=${PROJECT_SOURCE_DIR}/bin:${PROJECT_SOURCE_DIR}/test-deps/openssl-1.1.1/bin:${PROJECT_SOURCE_DIR}/test-deps/gnutls37/bin:$ENV{PATH}
                        PYTHONNOUSERSITE=1
                        S2N_INTEG_TEST=1
                        TOX_TEST_NAME=${test_file_path}
                        ${Python3_EXECUTABLE} -m tox
                        WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}/tests/integrationv2)
            endif()
            set_property(TEST ${test_target} PROPERTY LABELS "integrationv2")
            set_property(TEST ${test_target} PROPERTY TIMEOUT 7200)
        endforeach()
    endif()

    if(S2N_FUZZ_TEST)
        message(STATUS "Fuzz build enabled")
        set(SCRIPT_PATH "${CMAKE_CURRENT_SOURCE_DIR}/tests/fuzz/runFuzzTest.sh")
        file(GLOB FUZZ_TEST_SRCS "${CMAKE_CURRENT_SOURCE_DIR}/tests/fuzz/*.c")

        file(GLOB TESTLIB_SRC "tests/testlib/*.c")
        file(GLOB TESTLIB_HEADERS "tests/testlib/*.h" "tests/s2n_test.h")

        # This must be a shared object so that symbols can be overridden by the
        # fuzz test specific LD_PRELOAD libraries.
        add_library(fuzztest SHARED ${TESTLIB_SRC})
        target_include_directories(fuzztest PUBLIC tests)
        target_link_libraries(fuzztest PUBLIC ${PROJECT_NAME})

        # Set default values for fuzzing if not defined
        if(NOT DEFINED FUZZ_TIMEOUT_SEC)
            set(FUZZ_TIMEOUT_SEC 60)
        endif()

        if(DEFINED ENV{CORPUS_UPLOAD_LOC})
            set(CORPUS_UPLOAD_LOC $ENV{CORPUS_UPLOAD_LOC})
        else()
            set(CORPUS_UPLOAD_LOC "none")
        endif()

        if(DEFINED ENV{ARTIFACT_UPLOAD_LOC})
            set(ARTIFACT_UPLOAD_LOC $ENV{ARTIFACT_UPLOAD_LOC})
        else()
            set(ARTIFACT_UPLOAD_LOC "none")
        endif()

        # Build LD_PRELOAD shared libraries
        set(LIBRARY_OUTPUT_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/tests/fuzz/LD_PRELOAD)
        file(GLOB LIBRARY_SRCS "${CMAKE_CURRENT_SOURCE_DIR}/tests/fuzz/LD_PRELOAD/*.c")
        foreach(SRC ${LIBRARY_SRCS})
            get_filename_component(LIB_NAME ${SRC} NAME_WE)
            add_library(${LIB_NAME} SHARED ${SRC})
            target_include_directories(${LIB_NAME} PRIVATE 
                ${CMAKE_CURRENT_SOURCE_DIR}
                ${CMAKE_CURRENT_SOURCE_DIR}/api
            )
            # Set the output directory and remove the default "lib" prefix
            set_target_properties(${LIB_NAME} PROPERTIES
                PREFIX ""
                LIBRARY_OUTPUT_DIRECTORY ${LIBRARY_OUTPUT_DIRECTORY}
            )
            target_compile_options(${LIB_NAME} PRIVATE
                -fPIC
            )
        endforeach()

        set(CMAKE_C_COMPILER clang)

        foreach(src ${FUZZ_TEST_SRCS})
            get_filename_component(TEST_NAME ${src} NAME_WE)

            add_executable(${TEST_NAME} ${src})
            
            target_compile_options(${TEST_NAME} PRIVATE 
                -g -Wno-unknown-pragmas -Wno-unused-result
            )
            target_link_options(${TEST_NAME} PRIVATE 
                -fsanitize=fuzzer -lstdc++
            )
            target_link_libraries(${TEST_NAME} PRIVATE 
                fuzztest
            )

            # Set the output directory for the fuzzing binaries
            set(FUZZ_BIN_DIR "${CMAKE_CURRENT_SOURCE_DIR}/tests/fuzz")
            set_target_properties(${TEST_NAME} PROPERTIES
                RUNTIME_OUTPUT_DIRECTORY ${FUZZ_BIN_DIR}
            )

            add_test(NAME ${TEST_NAME}
                    COMMAND ${CMAKE_COMMAND} -E env
                        DYLD_LIBRARY_PATH=${CMAKE_CURRENT_BINARY_DIR}/lib:${CMAKE_CURRENT_BINARY_DIR}/tests/testlib:${CMAKE_CURRENT_SOURCE_DIR}/libcrypto-root/lib:$ENV{DYLD_LIBRARY_PATH}
                        LD_LIBRARY_PATH=${CMAKE_CURRENT_BINARY_DIR}/lib:${CMAKE_CURRENT_BINARY_DIR}/tests/testlib:${CMAKE_CURRENT_SOURCE_DIR}/libcrypto-root/lib:$ENV{LD_LIBRARY_PATH}
                        bash ${SCRIPT_PATH} ${TEST_NAME} ${FUZZ_TIMEOUT_SEC} ${CORPUS_UPLOAD_LOC} ${ARTIFACT_UPLOAD_LOC}
                    WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/tests/fuzz)
            set_property(TEST ${TEST_NAME} PROPERTY LABELS "fuzz")
        endforeach()
    endif()
endif()

#install the s2n files
install(FILES ${API_HEADERS} DESTINATION "include/" COMPONENT Development)
install(FILES ${API_UNSTABLE_HEADERS} DESTINATION "include/s2n/unstable" COMPONENT Development)

if (UNIX AND NOT APPLE)
    include(GNUInstallDirs)
elseif(NOT DEFINED CMAKE_INSTALL_LIBDIR)
    set(CMAKE_INSTALL_LIBDIR "lib")
endif()

if (S2N_INSTALL_S2NC_S2ND)
  install(
    TARGETS s2nc s2nd RUNTIME DESTINATION bin
    )
endif()

install(
        TARGETS ${PROJECT_NAME}
        EXPORT ${PROJECT_NAME}-targets
        ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR} COMPONENT Development
        LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR} COMPONENT Runtime
        RUNTIME DESTINATION bin COMPONENT Runtime
)

configure_file("cmake/${PROJECT_NAME}-config.cmake"
        "${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}-config.cmake"
        @ONLY)

if (BUILD_SHARED_LIBS)
   set (TARGET_DIR "shared")
else()
   set (TARGET_DIR "static")
endif()

install(EXPORT "${PROJECT_NAME}-targets"
        DESTINATION "${CMAKE_INSTALL_LIBDIR}/${PROJECT_NAME}/cmake/${TARGET_DIR}"
        NAMESPACE AWS::
        COMPONENT Development)

install(FILES "${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}-config.cmake"
        DESTINATION "${CMAKE_INSTALL_LIBDIR}/${PROJECT_NAME}/cmake/"
        COMPONENT Development)

install(FILES "cmake/modules/Findcrypto.cmake"
        DESTINATION "${CMAKE_INSTALL_LIBDIR}/${PROJECT_NAME}/cmake/modules/"
        COMPONENT Development)