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# Ask xcode-select where to find /Developer or fall back to ancient location.
execute_process(COMMAND xcode-select -print-path
OUTPUT_VARIABLE _stdout
OUTPUT_STRIP_TRAILING_WHITESPACE
ERROR_VARIABLE _stderr
RESULT_VARIABLE _failed)
if(NOT _failed AND IS_DIRECTORY ${_stdout})
set(OSX_DEVELOPER_ROOT ${_stdout})
elseif(IS_DIRECTORY "/Developer")
set(OSX_DEVELOPER_ROOT "/Developer")
else()
set(OSX_DEVELOPER_ROOT "")
endif()
execute_process(COMMAND sw_vers -productVersion
OUTPUT_VARIABLE CURRENT_OSX_VERSION
OUTPUT_STRIP_TRAILING_WHITESPACE)
# Save CMAKE_OSX_ARCHITECTURES from the environment.
set(CMAKE_OSX_ARCHITECTURES "$ENV{CMAKE_OSX_ARCHITECTURES}" CACHE STRING
"Build architectures for OSX")
if(NOT CMAKE_CROSSCOMPILING AND
CMAKE_SYSTEM_NAME STREQUAL "Darwin" AND
CMAKE_HOST_SYSTEM_PROCESSOR MATCHES "^(arm64|x86_64)$")
execute_process(COMMAND sysctl -q hw.optional.arm64
OUTPUT_VARIABLE _sysctl_stdout
ERROR_VARIABLE _sysctl_stderr
RESULT_VARIABLE _sysctl_result
)
# When building on an Apple Silicon host, we need to explicitly specify
# the architecture to the toolchain since it will otherwise guess the
# architecture based on that of the build system tool.
# Set an *internal variable* to tell the generators to do this.
if(_sysctl_result EQUAL 0 AND _sysctl_stdout MATCHES "hw.optional.arm64: 1")
set(_CMAKE_APPLE_ARCHS_DEFAULT "${CMAKE_HOST_SYSTEM_PROCESSOR}")
endif()
unset(_sysctl_result)
unset(_sysctl_stderr)
unset(_sysctl_stdout)
endif()
# macOS, iOS, tvOS, and watchOS should lookup compilers from
# Platform/Apple-${CMAKE_CXX_COMPILER_ID}-<LANG>
set(CMAKE_EFFECTIVE_SYSTEM_NAME "Apple")
#----------------------------------------------------------------------------
# _CURRENT_OSX_VERSION - as a two-component string: 10.5, 10.6, ...
#
string(REGEX REPLACE "^([0-9]+\\.[0-9]+).*$" "\\1"
_CURRENT_OSX_VERSION "${CURRENT_OSX_VERSION}")
#----------------------------------------------------------------------------
# CMAKE_OSX_DEPLOYMENT_TARGET
# Set cache variable - end user may change this during ccmake or cmake-gui configure.
if(CMAKE_SYSTEM_NAME STREQUAL "Darwin" AND _CURRENT_OSX_VERSION VERSION_GREATER 10.3)
set(CMAKE_OSX_DEPLOYMENT_TARGET "$ENV{MACOSX_DEPLOYMENT_TARGET}" CACHE STRING
"Minimum OS X version to target for deployment (at runtime); newer APIs weak linked. Set to empty string for default value.")
endif()
#----------------------------------------------------------------------------
# CMAKE_OSX_SYSROOT
if(CMAKE_OSX_SYSROOT)
# Use the existing value without further computation to choose a default.
set(_CMAKE_OSX_SYSROOT_DEFAULT "${CMAKE_OSX_SYSROOT}")
elseif(NOT "x$ENV{SDKROOT}" STREQUAL "x" AND
(NOT "x$ENV{SDKROOT}" MATCHES "/" OR IS_DIRECTORY "$ENV{SDKROOT}"))
# Use the value of SDKROOT from the environment.
set(_CMAKE_OSX_SYSROOT_DEFAULT "$ENV{SDKROOT}")
elseif(CMAKE_SYSTEM_NAME STREQUAL iOS)
set(_CMAKE_OSX_SYSROOT_DEFAULT "iphoneos")
elseif(CMAKE_SYSTEM_NAME STREQUAL tvOS)
set(_CMAKE_OSX_SYSROOT_DEFAULT "appletvos")
elseif(CMAKE_SYSTEM_NAME STREQUAL watchOS)
set(_CMAKE_OSX_SYSROOT_DEFAULT "watchos")
elseif("${CMAKE_GENERATOR}" MATCHES Xcode
OR CMAKE_OSX_DEPLOYMENT_TARGET
OR CMAKE_OSX_ARCHITECTURES MATCHES "[^;]"
OR NOT EXISTS "/usr/include/sys/types.h")
# Find installed SDKs in either Xcode-4.3+ or pre-4.3 SDKs directory.
set(_CMAKE_OSX_SDKS_DIR "")
if(OSX_DEVELOPER_ROOT)
foreach(_d Platforms/MacOSX.platform/Developer/SDKs SDKs)
file(GLOB _CMAKE_OSX_SDKS ${OSX_DEVELOPER_ROOT}/${_d}/*)
if(_CMAKE_OSX_SDKS)
set(_CMAKE_OSX_SDKS_DIR ${OSX_DEVELOPER_ROOT}/${_d})
break()
endif()
endforeach()
endif()
if(_CMAKE_OSX_SDKS_DIR)
# Find the latest SDK as recommended by Apple (Technical Q&A QA1806)
set(_CMAKE_OSX_LATEST_SDK_VERSION "0.0")
file(GLOB _CMAKE_OSX_SDKS RELATIVE "${_CMAKE_OSX_SDKS_DIR}" "${_CMAKE_OSX_SDKS_DIR}/MacOSX*.sdk")
foreach(_SDK ${_CMAKE_OSX_SDKS})
if(IS_DIRECTORY "${_CMAKE_OSX_SDKS_DIR}/${_SDK}"
AND _SDK MATCHES "MacOSX([0-9]+\\.[0-9]+)[^/]*\\.sdk"
AND CMAKE_MATCH_1 VERSION_GREATER ${_CMAKE_OSX_LATEST_SDK_VERSION})
set(_CMAKE_OSX_LATEST_SDK_VERSION "${CMAKE_MATCH_1}")
endif()
endforeach()
if(NOT _CMAKE_OSX_LATEST_SDK_VERSION STREQUAL "0.0")
set(_CMAKE_OSX_SYSROOT_DEFAULT "${_CMAKE_OSX_SDKS_DIR}/MacOSX${_CMAKE_OSX_LATEST_SDK_VERSION}.sdk")
else()
message(WARNING "Could not find any valid SDKs in ${_CMAKE_OSX_SDKS_DIR}")
endif()
if(NOT CMAKE_CROSSCOMPILING AND NOT CMAKE_OSX_DEPLOYMENT_TARGET
AND (_CURRENT_OSX_VERSION VERSION_LESS _CMAKE_OSX_LATEST_SDK_VERSION
OR _CMAKE_OSX_LATEST_SDK_VERSION STREQUAL "0.0"))
set(CMAKE_OSX_DEPLOYMENT_TARGET ${_CURRENT_OSX_VERSION} CACHE STRING
"Minimum OS X version to target for deployment (at runtime); newer APIs weak linked. Set to empty string for default value." FORCE)
endif()
else()
# Assume developer files are in root (such as Xcode 4.5 command-line tools).
set(_CMAKE_OSX_SYSROOT_DEFAULT "")
endif()
endif()
# Set cache variable - end user may change this during ccmake or cmake-gui configure.
# Choose the type based on the current value.
set(_CMAKE_OSX_SYSROOT_TYPE STRING)
foreach(_v CMAKE_OSX_SYSROOT _CMAKE_OSX_SYSROOT_DEFAULT)
if("x${${_v}}" MATCHES "/")
set(_CMAKE_OSX_SYSROOT_TYPE PATH)
break()
endif()
endforeach()
set(CMAKE_OSX_SYSROOT "${_CMAKE_OSX_SYSROOT_DEFAULT}" CACHE ${_CMAKE_OSX_SYSROOT_TYPE}
"The product will be built against the headers and libraries located inside the indicated SDK.")
# Resolves the SDK name into a path
function(_apple_resolve_sdk_path sdk_name ret)
execute_process(
COMMAND xcrun -sdk ${sdk_name} --show-sdk-path
OUTPUT_VARIABLE _stdout
OUTPUT_STRIP_TRAILING_WHITESPACE
ERROR_VARIABLE _stderr
RESULT_VARIABLE _failed
)
set(${ret} "${_stdout}" PARENT_SCOPE)
endfunction()
function(_apple_resolve_supported_archs_for_sdk_from_system_lib sdk_path ret ret_failed)
# Detect the supported SDK architectures by inspecting the main libSystem library.
set(common_lib_prefix "${sdk_path}/usr/lib/libSystem")
set(system_lib_dylib_path "${common_lib_prefix}.dylib")
set(system_lib_tbd_path "${common_lib_prefix}.tbd")
# Newer SDKs ship text based dylib stub files which contain the architectures supported by the
# library in text form.
if(EXISTS "${system_lib_tbd_path}")
file(STRINGS "${system_lib_tbd_path}" tbd_lines REGEX "^(archs|targets): +\\[.+\\]")
if(NOT tbd_lines)
set(${ret_failed} TRUE PARENT_SCOPE)
return()
endif()
# The tbd architectures line looks like the following:
# archs: [ armv7, armv7s, arm64, arm64e ]
# or for version 4 TBD files:
# targets: [ armv7-ios, armv7s-ios, arm64-ios, arm64e-ios ]
list(GET tbd_lines 0 first_arch_line)
string(REGEX REPLACE
"(archs|targets): +\\[ (.+) \\]" "\\2" arches_comma_separated "${first_arch_line}")
string(STRIP "${arches_comma_separated}" arches_comma_separated)
string(REPLACE "," ";" arch_list "${arches_comma_separated}")
string(REPLACE " " "" arch_list "${arch_list}")
# Remove -platform suffix from target (version 4 only)
string(REGEX REPLACE "-[a-z-]+" "" arch_list "${arch_list}")
if(NOT arch_list)
set(${ret_failed} TRUE PARENT_SCOPE)
return()
endif()
set(${ret} "${arch_list}" PARENT_SCOPE)
elseif(EXISTS "${system_lib_dylib_path}")
# Old SDKs (Xcode < 7) ship dylib files, use lipo to inspect the supported architectures.
# Can't use -archs because the option is not available in older Xcode versions.
execute_process(
COMMAND lipo -info ${system_lib_dylib_path}
OUTPUT_VARIABLE lipo_output
OUTPUT_STRIP_TRAILING_WHITESPACE
ERROR_VARIABLE _stderr
RESULT_VARIABLE _failed
)
if(_failed OR NOT lipo_output OR NOT lipo_output MATCHES "(Non-fat file:|Architectures in the fat file:)")
set(${ret_failed} TRUE PARENT_SCOPE)
return()
endif()
# The lipo output looks like the following:
# Non-fat file: <path> is architecture: i386
# Architectures in the fat file: <path> are: i386 x86_64
string(REGEX REPLACE
"^(.+)is architecture:(.+)" "\\2" arches_space_separated "${lipo_output}")
string(REGEX REPLACE
"^(.+)are:(.+)" "\\2" arches_space_separated "${arches_space_separated}")
# Need to clean up the arches, with Xcode 4.6.3 the output of lipo -info contains some
# additional info, e.g.
# Architectures in the fat file: <path> are: armv7 (cputype (12) cpusubtype (11))
string(REGEX REPLACE
"\\(.+\\)" "" arches_space_separated "${arches_space_separated}")
# The output is space separated.
string(STRIP "${arches_space_separated}" arches_space_separated)
string(REPLACE " " ";" arch_list "${arches_space_separated}")
if(NOT arch_list)
set(${ret_failed} TRUE PARENT_SCOPE)
return()
endif()
set(${ret} "${arch_list}" PARENT_SCOPE)
else()
# This shouldn't happen, but keep it for safety.
message(WARNING "No way to find architectures for given sdk_path '${sdk_path}'")
set(${ret_failed} TRUE PARENT_SCOPE)
endif()
endfunction()
# Handle multi-arch sysroots. Do this before CMAKE_OSX_SYSROOT is
# transformed into a path, so that we know the sysroot name.
function(_apple_resolve_multi_arch_sysroots)
if(DEFINED CMAKE_APPLE_ARCH_SYSROOTS)
return() # Already cached
endif()
list(LENGTH CMAKE_OSX_ARCHITECTURES _num_archs)
if(NOT (_num_archs GREATER 1))
return() # Only apply to multi-arch
endif()
if(CMAKE_OSX_SYSROOT STREQUAL "macosx")
# macOS doesn't have a simulator sdk / sysroot, so there is no need to handle per-sdk arches.
return()
endif()
if(IS_DIRECTORY "${CMAKE_OSX_SYSROOT}")
if(NOT CMAKE_OSX_SYSROOT STREQUAL _CMAKE_OSX_SYSROOT_DEFAULT)
message(WARNING "Can not resolve multi-arch sysroots with CMAKE_OSX_SYSROOT set to path (${CMAKE_OSX_SYSROOT})")
endif()
return()
endif()
string(REPLACE "os" "simulator" _simulator_sdk ${CMAKE_OSX_SYSROOT})
set(_sdks "${CMAKE_OSX_SYSROOT};${_simulator_sdk}")
foreach(sdk ${_sdks})
_apple_resolve_sdk_path(${sdk} _sdk_path)
if(NOT IS_DIRECTORY "${_sdk_path}")
message(WARNING "Failed to resolve SDK path for '${sdk}'")
continue()
endif()
_apple_resolve_supported_archs_for_sdk_from_system_lib(${_sdk_path} _sdk_archs _failed)
if(_failed)
# Failure to extract supported architectures for an SDK means that the installed SDK is old
# and does not provide such information (SDKs that come with Xcode >= 10.x started providing
# the information). In such a case, return early, and handle multi-arch builds the old way
# (no per-sdk arches).
return()
endif()
set(_sdk_archs_${sdk} ${_sdk_archs})
set(_sdk_path_${sdk} ${_sdk_path})
endforeach()
foreach(arch ${CMAKE_OSX_ARCHITECTURES})
set(_arch_sysroot "")
foreach(sdk ${_sdks})
list(FIND _sdk_archs_${sdk} ${arch} arch_index)
if(NOT arch_index EQUAL -1)
set(_arch_sysroot ${_sdk_path_${sdk}})
break()
endif()
endforeach()
if(_arch_sysroot)
list(APPEND _arch_sysroots ${_arch_sysroot})
else()
message(WARNING "No SDK found for architecture '${arch}'")
list(APPEND _arch_sysroots "${arch}-SDK-NOTFOUND")
endif()
endforeach()
set(CMAKE_APPLE_ARCH_SYSROOTS "${_arch_sysroots}" CACHE INTERNAL
"Architecture dependent sysroots, one per CMAKE_OSX_ARCHITECTURES")
endfunction()
_apple_resolve_multi_arch_sysroots()
# Transform CMAKE_OSX_SYSROOT to absolute path
set(_CMAKE_OSX_SYSROOT_PATH "")
if(CMAKE_OSX_SYSROOT)
if("x${CMAKE_OSX_SYSROOT}" MATCHES "/")
# This is a path to the SDK. Make sure it exists.
if(NOT IS_DIRECTORY "${CMAKE_OSX_SYSROOT}")
message(WARNING "Ignoring CMAKE_OSX_SYSROOT value:\n ${CMAKE_OSX_SYSROOT}\n"
"because the directory does not exist.")
set(CMAKE_OSX_SYSROOT "")
endif()
set(_CMAKE_OSX_SYSROOT_PATH "${CMAKE_OSX_SYSROOT}")
else()
_apple_resolve_sdk_path(${CMAKE_OSX_SYSROOT} _sdk_path)
if(IS_DIRECTORY "${_sdk_path}")
set(_CMAKE_OSX_SYSROOT_PATH "${_sdk_path}")
# For non-Xcode generators use the path.
if(NOT "${CMAKE_GENERATOR}" MATCHES "Xcode")
set(CMAKE_OSX_SYSROOT "${_CMAKE_OSX_SYSROOT_PATH}")
endif()
endif()
endif()
endif()