# Toolchain configuration when compiling for Darwin Platforms
set(CMAKE_SYSTEM_NAME Darwin)
set(CMAKE_Swift_COMPILER_WORKS YES)
set(CMAKE_C_COMPILER_WORKS YES)
set(CMAKE_CXX_COMPILER_WORKS YES)

find_program(XCRUN_EXECUTABLE NAMES "xcrun" REQUIRED)

if(NOT CMAKE_OSX_SYSROOT)
  if(NOT DEFINED ENV{SDKROOT})
    message(FATAL_ERROR "`CMAKE_OSX_SYSROOT` and the 'SDKROOT' environment variable are not set")
  endif()

  execute_process(COMMAND "${XCRUN_EXECUTABLE}" --show-sdk-path -sdk $ENV{SDKROOT}
    OUTPUT_VARIABLE SDKROOT
    ERROR_QUIET
    OUTPUT_STRIP_TRAILING_WHITESPACE)

  if(NOT EXISTS ${SDKROOT})
    message(FATAL_ERROR "SDKROOT could not be detected!")
  endif()

  message(STATUS "Using SDKROOT: ${SDKROOT}")
  set(CMAKE_OSX_SYSROOT "${SDKROOT}" CACHE FILEPATH "")
endif()

if(NOT CMAKE_C_COMPILER)
  execute_process(COMMAND "${XCRUN_EXECUTABLE}" --sdk ${CMAKE_OSX_SYSROOT} --find clang
    OUTPUT_VARIABLE CMAKE_C_COMPILER
    ERROR_QUIET
    OUTPUT_STRIP_TRAILING_WHITESPACE)
  message(STATUS "Using C compiler ${CMAKE_C_COMPILER}")
endif()

if(NOT CMAKE_CXX_COMPILER)
  execute_process(COMMAND "${XCRUN_EXECUTABLE}" --sdk ${CMAKE_OSX_SYSROOT} --find clang++
    OUTPUT_VARIABLE CMAKE_CXX_COMPILER
    ERROR_QUIET
    OUTPUT_STRIP_TRAILING_WHITESPACE)
  message(STATUS "Using CXX compiler ${CMAKE_CXX_COMPILER}")
endif()

if(NOT CMAKE_Swift_COMPILER)
  execute_process(COMMAND "${XCRUN_EXECUTABLE}" --sdk ${CMAKE_OSX_SYSROOT} --find swiftc
    OUTPUT_VARIABLE CMAKE_Swift_COMPILER
    ERROR_QUIET
    OUTPUT_STRIP_TRAILING_WHITESPACE)
  message(STATUS "Using Swift compiler ${CMAKE_Swift_COMPILER}")
endif()

if(NOT CMAKE_AR)
  execute_process(COMMAND "${XCRUN_EXECUTABLE}" --sdk ${CMAKE_OSX_SYSROOT} --find ar
    OUTPUT_VARIABLE CMAKE_AR
    ERROR_QUIET
    OUTPUT_STRIP_TRAILING_WHITESPACE)
  message(STATUS "Using ar ${CMAKE_AR}")
endif()

if(NOT CMAKE_RANLIB)
  execute_process(COMMAND "${XCRUN_EXECUTABLE}" --sdk ${CMAKE_OSX_SYSROOT} --find ranlib
    OUTPUT_VARIABLE CMAKE_RANLIB
    ERROR_QUIET
    OUTPUT_STRIP_TRAILING_WHITESPACE)
  message(STATUS "Using ranlib ${CMAKE_RANLIB}")
endif()

if(NOT CMAKE_STRIP)
  execute_process(COMMAND "${XCRUN_EXECUTABLE}" --sdk ${CMAKE_OSX_SYSROOT} --find strip
    OUTPUT_VARIABLE CMAKE_STRIP
    ERROR_QUIET
    OUTPUT_STRIP_TRAILING_WHITESPACE)
  message(STATUS "Using strip ${CMAKE_STRIP}")
endif()

if(NOT CMAKE_DSYMUTIL)
  execute_process(COMMAND "${XCRUN_EXECUTABLE}" --sdk ${CMAKE_OSX_SYSROOT} --find dsymutil
    OUTPUT_VARIABLE CMAKE_DSYMUTIL
    ERROR_QUIET
    OUTPUT_STRIP_TRAILING_WHITESPACE)
  message(STATUS "Using dsymutil ${CMAKE_DSYMUTIL}")
endif()

if(NOT CMAKE_LIBTOOL)
  execute_process(COMMAND "${XCRUN_EXECUTABLE}" --sdk ${CMAKE_OSX_SYSROOT} --find libtool
   OUTPUT_VARIABLE CMAKE_LIBTOOL
   ERROR_QUIET
   OUTPUT_STRIP_TRAILING_WHITESPACE)
  message(STATUS "Using libtool ${CMAKE_LIBTOOL}")
endif()

if(NOT CMAKE_CODESIGN)
  execute_process(COMMAND "${XCRUN_EXECUTABLE}" --sdk ${CMAKE_OSX_SYSROOT} --find codesign
   OUTPUT_VARIABLE CMAKE_CODESIGN
   ERROR_QUIET
   OUTPUT_STRIP_TRAILING_WHITESPACE)
  message(STATUS "Using codesign ${CMAKE_CODESIGN}")
endif()

if(NOT CMAKE_CODESIGN_ALLOCATE)
  execute_process(
    COMMAND "${XCRUN_EXECUTABLE}" --sdk ${CMAKE_OSX_SYSROOT} --find codesign_allocate
    OUTPUT_VARIABLE CMAKE_CODESIGN_ALLOCATE
    ERROR_QUIET
    OUTPUT_STRIP_TRAILING_WHITESPACE)
  message(STATUS "Using codesign_allocate ${CMAKE_CODESIGN_ALLOCATE}")
endif()