Modules/CMakeTestSwiftCompiler.cmake

   1 # Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
   2 # file Copyright.txt or https://cmake.org/licensing for details.
   3
   4 if(CMAKE_Swift_COMPILER_FORCED)
   5   # The compiler configuration was forced by the user.
   6   # Assume the user has configured all compiler information.
   7   set(CMAKE_Swift_COMPILER_WORKS TRUE)
   8   return()
   9 endif()
  10
  11 include(CMakeTestCompilerCommon)
  12
  13 # Remove any cached result from an older CMake version.
  14 # We now store this in CMakeSwiftCompiler.cmake.
  15 unset(CMAKE_Swift_COMPILER_WORKS CACHE)
  16
  17 # This file is used by EnableLanguage in cmGlobalGenerator to
  18 # determine that the selected C++ compiler can actually compile
  19 # and link the most basic of programs.   If not, a fatal error
  20 # is set and cmake stops processing commands and will not generate
  21 # any makefiles or projects.
  22 if(NOT CMAKE_Swift_COMPILER_WORKS)
  23   PrintTestCompilerStatus("Swift")
  24   # Clear result from normal variable.
  25   unset(CMAKE_Swift_COMPILER_WORKS)
  26   # Puts test result in cache variable.
  27   set(__CMAKE_Swift_TEST_SOURCE "print(\"CMake\")\n")
  28   try_compile(CMAKE_Swift_COMPILER_WORKS
  29     SOURCE_FROM_VAR main.swift __CMAKE_Swift_TEST_SOURCE
  30     OUTPUT_VARIABLE __CMAKE_Swift_COMPILER_OUTPUT)
  31   # Move result from cache to normal variable.
  32   set(CMAKE_Swift_COMPILER_WORKS ${CMAKE_Swift_COMPILER_WORKS})
  33   unset(CMAKE_Swift_COMPILER_WORKS CACHE)
  34   set(Swift_TEST_WAS_RUN 1)
  35 endif()
  36
  37 if(NOT CMAKE_Swift_COMPILER_WORKS)
  38   PrintTestCompilerResult(CHECK_FAIL "broken")
  39   file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
  40     "Determining if the Swift compiler works failed with "
  41     "the following output:\n${__CMAKE_Swift_COMPILER_OUTPUT}\n\n")
  42   string(REPLACE "\n" "\n  " _output "${__CMAKE_Swift_COMPILER_OUTPUT}")
  43   message(FATAL_ERROR "The Swift compiler\n  \"${CMAKE_Swift_COMPILER}\"\n"
  44     "is not able to compile a simple test program.\nIt fails "
  45     "with the following output:\n  ${_output}\n\n"
  46     "CMake will not be able to correctly generate this project.")
  47 else()
  48   if(Swift_TEST_WAS_RUN)
  49     PrintTestCompilerResult(CHECK_PASS "works")
  50     file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
  51       "Determining if the Swift compiler works passed with "
  52       "the following output:\n${__CMAKE_Swift_COMPILER_OUTPUT}\n\n")
  53   endif()
  54
  55   # Unlike C and CXX we do not yet detect any information about the Swift ABI.
  56   # However, one of the steps done for C and CXX as part of that detection is
  57   # to initialize the implicit include directories.  That is relevant here.
  58   set(CMAKE_Swift_IMPLICIT_INCLUDE_DIRECTORIES "${_CMAKE_Swift_IMPLICIT_INCLUDE_DIRECTORIES_INIT}")
  59
  60   # Re-configure to save learned information.
  61   configure_file(${CMAKE_ROOT}/Modules/CMakeSwiftCompiler.cmake.in
  62                  ${CMAKE_PLATFORM_INFO_DIR}/CMakeSwiftCompiler.cmake @ONLY)
  63   include(${CMAKE_PLATFORM_INFO_DIR}/CMakeSwiftCompiler.cmake)
  64 endif()
  65
  66 unset(__CMAKE_Swift_TEST_SOURCE)
  67 unset(__CMAKE_Swift_COMPILER_OUTPUT)