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  set(default_build_type "RelWithDebInfo")
  if(is_multi_config)
    set(CMAKE_CONFIGURATION_TYPES "${default_build_type}" "Release" "Debug" "MinSizeRel" "Coverage" CACHE STRING
      "Supported configuration types."
      FORCE
    )
  else()
    set_property(CACHE CMAKE_BUILD_TYPE PROPERTY
      STRINGS "${default_build_type}" "Release" "Debug" "MinSizeRel" "Coverage"
    )
    if(NOT CMAKE_BUILD_TYPE)
      message(STATUS "Setting build type to \"${default_build_type}\" as none was specified")
      set(CMAKE_BUILD_TYPE "${default_build_type}" CACHE STRING
        "Choose the type of build."
        FORCE
      )
    endif()
  endif()
endif()

include(TryAppendCFlags)
if(MSVC)
  # Keep the following commands ordered lexicographically.
  try_append_c_flags(/W3) # Production quality warning level.
  try_append_c_flags(/wd4146) # Disable warning C4146 "unary minus operator applied to unsigned type, result still unsigned".
  try_append_c_flags(/wd4244) # Disable warning C4244 "'conversion' conversion from 'type1' to 'type2', possible loss of data".
  try_append_c_flags(/wd4267) # Disable warning C4267 "'var' : conversion from 'size_t' to 'type', possible loss of data".
  # Eliminate deprecation warnings for the older, less secure functions.
  add_compile_definitions(_CRT_SECURE_NO_WARNINGS)
else()
  # Keep the following commands ordered lexicographically.
  try_append_c_flags(-pedantic)
  try_append_c_flags(-Wall) # GCC >= 2.95 and probably many other compilers.
  try_append_c_flags(-Wcast-align) # GCC >= 2.95.
  try_append_c_flags(-Wcast-align=strict) # GCC >= 8.0.
  try_append_c_flags(-Wconditional-uninitialized) # Clang >= 3.0 only.
  try_append_c_flags(-Wextra) # GCC >= 3.4, this is the newer name of -W, which we don't use because older GCCs will warn about unused functions.
  try_append_c_flags(-Wnested-externs)
  try_append_c_flags(-Wno-long-long) # GCC >= 3.0, -Wlong-long is implied by -pedantic.
  try_append_c_flags(-Wno-overlength-strings) # GCC >= 4.2, -Woverlength-strings is implied by -pedantic.
  try_append_c_flags(-Wno-unused-function) # GCC >= 3.0, -Wunused-function is implied by -Wall.
  try_append_c_flags(-Wreserved-identifier) # Clang >= 13.0 only.
  try_append_c_flags(-Wshadow)
  try_append_c_flags(-Wstrict-prototypes)
  try_append_c_flags(-Wundef)
endif()

set(CMAKE_C_VISIBILITY_PRESET hidden)

set(print_msan_notice)
if(SECP256K1_BUILD_CTIME_TESTS)
  include(CheckMemorySanitizer)
  check_memory_sanitizer(msan_enabled)
  if(msan_enabled)
    try_append_c_flags(-fno-sanitize-memory-param-retval)
    set(print_msan_notice YES)
  endif()
  unset(msan_enabled)
endif()

set(SECP256K1_APPEND_CFLAGS "" CACHE STRING "Compiler flags that are appended to the command line after all other flags added by the build system. This variable is intended for debugging and special builds.")
if(SECP256K1_APPEND_CFLAGS)
  # Appending to this low-level rule variable is the only way to
  # guarantee that the flags appear at the end of the command line.
  string(APPEND CMAKE_C_COMPILE_OBJECT " ${SECP256K1_APPEND_CFLAGS}")
endif()

set(SECP256K1_APPEND_LDFLAGS "" CACHE STRING "Linker flags that are appended to the command line after all other flags added by the build system. This variable is intended for debugging and special builds.")
if(SECP256K1_APPEND_LDFLAGS)
  # Appending to this low-level rule variable is the only way to
  # guarantee that the flags appear at the end of the command line.
  string(APPEND CMAKE_C_CREATE_SHARED_LIBRARY " ${SECP256K1_APPEND_LDFLAGS}")
  string(APPEND CMAKE_C_LINK_EXECUTABLE " ${SECP256K1_APPEND_LDFLAGS}")
endif()

if(NOT CMAKE_RUNTIME_OUTPUT_DIRECTORY)
  set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${PROJECT_BINARY_DIR}/bin)
endif()
if(NOT CMAKE_LIBRARY_OUTPUT_DIRECTORY)
  set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${PROJECT_BINARY_DIR}/lib)
endif()
if(NOT CMAKE_ARCHIVE_OUTPUT_DIRECTORY)
  set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${PROJECT_BINARY_DIR}/lib)
endif()
add_subdirectory(src)
if(SECP256K1_BUILD_EXAMPLES)
  add_subdirectory(examples)
endif()

message("\n")
message("secp256k1 configure summary")
message("===========================")
message("Build artifacts:")
if(BUILD_SHARED_LIBS)
  set(library_type "Shared")
else()
  set(library_type "Static")
endif()

message("  library type ........................ ${library_type}")
message("Optional modules:")
message("  ECDH ................................ ${SECP256K1_ENABLE_MODULE_ECDH}")
message("  ECDSA pubkey recovery ............... ${SECP256K1_ENABLE_MODULE_RECOVERY}")
message("  extrakeys ........................... ${SECP256K1_ENABLE_MODULE_EXTRAKEYS}")
message("  schnorrsig .......................... ${SECP256K1_ENABLE_MODULE_SCHNORRSIG}")
message("  musig ............................... ${SECP256K1_ENABLE_MODULE_MUSIG}")
message("  ElligatorSwift ...................... ${SECP256K1_ENABLE_MODULE_ELLSWIFT}")
message("Parameters:")
message("  ecmult window size .................. ${SECP256K1_ECMULT_WINDOW_SIZE}")
message("  ecmult gen table size ............... ${SECP256K1_ECMULT_GEN_KB} KiB")
message("Optional features:")
message("  assembly ............................ ${SECP256K1_ASM}")
message("  external callbacks .................. ${SECP256K1_USE_EXTERNAL_DEFAULT_CALLBACKS}")
if(SECP256K1_TEST_OVERRIDE_WIDE_MULTIPLY)
  message("  wide multiplication (test-only) ..... ${SECP256K1_TEST_OVERRIDE_WIDE_MULTIPLY}")
endif()
message("Optional binaries:")
message("  benchmark ........................... ${SECP256K1_BUILD_BENCHMARK}")
message("  noverify_tests ...................... ${SECP256K1_BUILD_TESTS}")
set(tests_status "${SECP256K1_BUILD_TESTS}")
if(CMAKE_BUILD_TYPE STREQUAL "Coverage")
  set(tests_status OFF)
endif()
message("  tests ............................... ${tests_status}")
message("  exhaustive tests .................... ${SECP256K1_BUILD_EXHAUSTIVE_TESTS}")
message("  ctime_tests ......................... ${SECP256K1_BUILD_CTIME_TESTS}")
message("  examples ............................ ${SECP256K1_BUILD_EXAMPLES}")
message("")