CMakeTestCXXCompiler.cmake 3.6 KB

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  1. # Distributed under the OSI-approved BSD 3-Clause License. See accompanying
  2. # file Copyright.txt or https://cmake.org/licensing for details.
  3. if(CMAKE_CXX_COMPILER_FORCED)
  4. # The compiler configuration was forced by the user.
  5. # Assume the user has configured all compiler information.
  6. set(CMAKE_CXX_COMPILER_WORKS TRUE)
  7. return()
  8. endif()
  9. include(CMakeTestCompilerCommon)
  10. # work around enforced code signing and / or missing exectuable target type
  11. set(__CMAKE_SAVED_TRY_COMPILE_TARGET_TYPE ${CMAKE_TRY_COMPILE_TARGET_TYPE})
  12. if(_CMAKE_FEATURE_DETECTION_TARGET_TYPE)
  13. set(CMAKE_TRY_COMPILE_TARGET_TYPE ${_CMAKE_FEATURE_DETECTION_TARGET_TYPE})
  14. endif()
  15. # Remove any cached result from an older CMake version.
  16. # We now store this in CMakeCXXCompiler.cmake.
  17. unset(CMAKE_CXX_COMPILER_WORKS CACHE)
  18. # This file is used by EnableLanguage in cmGlobalGenerator to
  19. # determine that the selected C++ compiler can actually compile
  20. # and link the most basic of programs. If not, a fatal error
  21. # is set and cmake stops processing commands and will not generate
  22. # any makefiles or projects.
  23. if(NOT CMAKE_CXX_COMPILER_WORKS)
  24. PrintTestCompilerStatus("CXX" "")
  25. __TestCompiler_setTryCompileTargetType()
  26. file(WRITE ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/testCXXCompiler.cxx
  27. "#ifndef __cplusplus\n"
  28. "# error \"The CMAKE_CXX_COMPILER is set to a C compiler\"\n"
  29. "#endif\n"
  30. "int main(){return 0;}\n")
  31. try_compile(CMAKE_CXX_COMPILER_WORKS ${CMAKE_BINARY_DIR}
  32. ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/testCXXCompiler.cxx
  33. OUTPUT_VARIABLE __CMAKE_CXX_COMPILER_OUTPUT)
  34. # Move result from cache to normal variable.
  35. set(CMAKE_CXX_COMPILER_WORKS ${CMAKE_CXX_COMPILER_WORKS})
  36. unset(CMAKE_CXX_COMPILER_WORKS CACHE)
  37. set(CXX_TEST_WAS_RUN 1)
  38. __TestCompiler_restoreTryCompileTargetType()
  39. endif()
  40. if(NOT CMAKE_CXX_COMPILER_WORKS)
  41. PrintTestCompilerStatus("CXX" " -- broken")
  42. file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
  43. "Determining if the CXX compiler works failed with "
  44. "the following output:\n${__CMAKE_CXX_COMPILER_OUTPUT}\n\n")
  45. string(REPLACE "\n" "\n " _output "${__CMAKE_CXX_COMPILER_OUTPUT}")
  46. message(FATAL_ERROR "The C++ compiler\n \"${CMAKE_CXX_COMPILER}\"\n"
  47. "is not able to compile a simple test program.\nIt fails "
  48. "with the following output:\n ${_output}\n\n"
  49. "CMake will not be able to correctly generate this project.")
  50. else()
  51. if(CXX_TEST_WAS_RUN)
  52. PrintTestCompilerStatus("CXX" " -- works")
  53. file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
  54. "Determining if the CXX compiler works passed with "
  55. "the following output:\n${__CMAKE_CXX_COMPILER_OUTPUT}\n\n")
  56. endif()
  57. # Try to identify the ABI and configure it into CMakeCXXCompiler.cmake
  58. include(${CMAKE_ROOT}/Modules/CMakeDetermineCompilerABI.cmake)
  59. CMAKE_DETERMINE_COMPILER_ABI(CXX ${CMAKE_ROOT}/Modules/CMakeCXXCompilerABI.cpp)
  60. # Try to identify the compiler features
  61. include(${CMAKE_ROOT}/Modules/CMakeDetermineCompileFeatures.cmake)
  62. CMAKE_DETERMINE_COMPILE_FEATURES(CXX)
  63. # Re-configure to save learned information.
  64. configure_file(
  65. ${CMAKE_ROOT}/Modules/CMakeCXXCompiler.cmake.in
  66. ${CMAKE_PLATFORM_INFO_DIR}/CMakeCXXCompiler.cmake
  67. @ONLY
  68. )
  69. include(${CMAKE_PLATFORM_INFO_DIR}/CMakeCXXCompiler.cmake)
  70. if(CMAKE_CXX_SIZEOF_DATA_PTR)
  71. foreach(f ${CMAKE_CXX_ABI_FILES})
  72. include(${f})
  73. endforeach()
  74. unset(CMAKE_CXX_ABI_FILES)
  75. endif()
  76. endif()
  77. set(CMAKE_TRY_COMPILE_TARGET_TYPE ${__CMAKE_SAVED_TRY_COMPILE_TARGET_TYPE})
  78. unset(__CMAKE_SAVED_TRY_COMPILE_TARGET_TYPE)
  79. unset(__CMAKE_CXX_COMPILER_OUTPUT)