cmake/PythonAutoDetectOSX.cmake
if(APPLE)
if(NOT CMAKE_OSX_SDK)
execute_process(
COMMAND xcrun
--show-sdk-version
OUTPUT_VARIABLE
SDK_VERSION
RESULT_VARIABLE
res
ERROR_QUIET
OUTPUT_STRIP_TRAILING_WHITESPACE)
# Transform into a two-component string (e.g "10.15.6" -> "10.15")
string(REGEX REPLACE "^([0-9]+\\.[0-9]+).*$" "\\1" SDK_VERSION "${SDK_VERSION}")
if(res)
# Probably running on an older version of XCode, instead try to list all available
# SDKs and extract the version of the first one.
execute_process(
COMMAND xcodebuild
-showsdks
OUTPUT_VARIABLE
xcodebuild_sdks
RESULT_VARIABLE
res
OUTPUT_STRIP_TRAILING_WHITESPACE)
string(REGEX MATCH "sdk macosx([0-9\\. ]+)" output "${xcodebuild_sdks}")
if(res OR output STREQUAL "")
message(FATAL_ERROR "Failed to detect CMAKE_OSX_SDK; please set manually (e.g. \"macosx10.6\")")
endif()
set(SDK_VERSION ${CMAKE_MATCH_1})
endif()
set(CMAKE_OSX_SDK macosx${SDK_VERSION})
endif()
if(NOT CMAKE_OSX_SYSROOT)
execute_process(
COMMAND xcodebuild
-sdk ${CMAKE_OSX_SDK}
-version Path
OUTPUT_VARIABLE
CMAKE_OSX_SYSROOT
RESULT_VARIABLE
res
OUTPUT_STRIP_TRAILING_WHITESPACE)
if(res)
message(FATAL_ERROR "Cannot determine SDK path for SDK: ${CMAKE_OSX_SDK}")
endif()
endif()
if(NOT CMAKE_OSX_DEPLOYMENT_TARGET)
execute_process(
COMMAND xcodebuild
-sdk ${CMAKE_OSX_SDK}
-version SDKVersion
OUTPUT_VARIABLE
CMAKE_OSX_DEPLOYMENT_TARGET
RESULT_VARIABLE
res
OUTPUT_STRIP_TRAILING_WHITESPACE)
if(res)
message(FATAL_ERROR "Cannot determine SDK version for SDK: ${CMAKE_OSX_SDK}")
endif()
endif()
endif()