abseil-cpp/absl/copts/AbseilConfigureCopts.cmake

# See absl/copts/copts.py and absl/copts/generate_copts.py
include(GENERATED_AbseilCopts)

set(ABSL_DEFAULT_LINKOPTS "")

if (BUILD_SHARED_LIBS AND MSVC)
  set(ABSL_BUILD_DLL TRUE)
  set(CMAKE_WINDOWS_EXPORT_ALL_SYMBOLS ON)
else()
  set(ABSL_BUILD_DLL FALSE)
endif()

if(APPLE AND CMAKE_CXX_COMPILER_ID MATCHES [[Clang]])
  # Some CMake targets (not known at the moment of processing) could be set to
  # compile for multiple architectures as specified by the OSX_ARCHITECTURES
  # property, which is target-specific.  We should neither inspect nor rely on
  # any CMake property or variable to detect an architecture, in particular:
  #
  #   - CMAKE_OSX_ARCHITECTURES
  #     is just an initial value for OSX_ARCHITECTURES; set too early.
  #
  #   - OSX_ARCHITECTURES
  #     is a per-target property; targets could be defined later, and their
  #     properties could be modified any time later.
  #
  #   - CMAKE_SYSTEM_PROCESSOR
  #     does not reflect multiple architectures at all.
  #
  # When compiling for multiple architectures, a build system can invoke a
  # compiler either
  #
  #   - once: a single command line for multiple architectures (Ninja build)
  #   - twice: two command lines per each architecture (Xcode build system)
  #
  # If case of Xcode, it would be possible to set an Xcode-specific attributes
  # like XCODE_ATTRIBUTE_OTHER_CPLUSPLUSFLAGS[arch=arm64] or similar.
  #
  # In both cases, the viable strategy is to pass all arguments at once, allowing
  # the compiler to dispatch arch-specific arguments to a designated backend.
  set(ABSL_RANDOM_RANDEN_COPTS "")
  foreach(_arch IN ITEMS "x86_64" "arm64")
    string(TOUPPER "${_arch}" _arch_uppercase)
    string(REPLACE "X86_64" "X64" _arch_uppercase ${_arch_uppercase})
    foreach(_flag IN LISTS ABSL_RANDOM_HWAES_${_arch_uppercase}_FLAGS)
      list(APPEND ABSL_RANDOM_RANDEN_COPTS "-Xarch_${_arch}" "${_flag}")
    endforeach()
  endforeach()
  # If a compiler happens to deal with an argument for a currently unused
  # architecture, it will warn about an unused command line argument.
  option(ABSL_RANDOM_RANDEN_COPTS_WARNING OFF
         "Warn if one of ABSL_RANDOM_RANDEN_COPTS is unused")
  if(ABSL_RANDOM_RANDEN_COPTS AND NOT ABSL_RANDOM_RANDEN_COPTS_WARNING)
    list(APPEND ABSL_RANDOM_RANDEN_COPTS "-Wno-unused-command-line-argument")
  endif()
elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "x86_64|amd64|AMD64")
  if (MSVC)
    set(ABSL_RANDOM_RANDEN_COPTS "${ABSL_RANDOM_HWAES_MSVC_X64_FLAGS}")
  else()
    set(ABSL_RANDOM_RANDEN_COPTS "${ABSL_RANDOM_HWAES_X64_FLAGS}")
  endif()
elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "arm.*|aarch64")
  if (CMAKE_SIZEOF_VOID_P STREQUAL "8")
    set(ABSL_RANDOM_RANDEN_COPTS "${ABSL_RANDOM_HWAES_ARM64_FLAGS}")
  elseif(CMAKE_SIZEOF_VOID_P STREQUAL "4")
    set(ABSL_RANDOM_RANDEN_COPTS "${ABSL_RANDOM_HWAES_ARM32_FLAGS}")
  else()
    message(WARNING "Value of CMAKE_SIZEOF_VOID_P (${CMAKE_SIZEOF_VOID_P}) is not supported.")
  endif()
else()
  message(WARNING "Value of CMAKE_SYSTEM_PROCESSOR (${CMAKE_SYSTEM_PROCESSOR}) is unknown and cannot be used to set ABSL_RANDOM_RANDEN_COPTS")
  set(ABSL_RANDOM_RANDEN_COPTS "")
endif()


if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
  set(ABSL_DEFAULT_COPTS "${ABSL_GCC_FLAGS}")
  set(ABSL_TEST_COPTS "${ABSL_GCC_FLAGS};${ABSL_GCC_TEST_FLAGS}")
elseif(CMAKE_CXX_COMPILER_ID MATCHES "Clang")  # MATCHES so we get both Clang and AppleClang
  if(MSVC)
    # clang-cl is half MSVC, half LLVM
    set(ABSL_DEFAULT_COPTS "${ABSL_CLANG_CL_FLAGS}")
    set(ABSL_TEST_COPTS "${ABSL_CLANG_CL_FLAGS};${ABSL_CLANG_CL_TEST_FLAGS}")
  else()
    set(ABSL_DEFAULT_COPTS "${ABSL_LLVM_FLAGS}")
    set(ABSL_TEST_COPTS "${ABSL_LLVM_FLAGS};${ABSL_LLVM_TEST_FLAGS}")
  endif()
elseif(CMAKE_CXX_COMPILER_ID STREQUAL "MSVC")
  set(ABSL_DEFAULT_COPTS "${ABSL_MSVC_FLAGS}")
  set(ABSL_TEST_COPTS "${ABSL_MSVC_FLAGS};${ABSL_MSVC_TEST_FLAGS}")
  set(ABSL_DEFAULT_LINKOPTS "${ABSL_MSVC_LINKOPTS}")
else()
  message(WARNING "Unknown compiler: ${CMAKE_CXX_COMPILER}.  Building with no default flags")
  set(ABSL_DEFAULT_COPTS "")
  set(ABSL_TEST_COPTS "")
endif()

set(ABSL_CXX_STANDARD "${CMAKE_CXX_STANDARD}")