CMakeTestCXXCompiler.cmake 3.5 KB
Newer Older
1

2
#=============================================================================
3
# Copyright 2003-2012 Kitware, Inc.
4 5 6 7 8 9 10 11
#
# Distributed under the OSI-approved BSD License (the "License");
# see accompanying file Copyright.txt for details.
#
# This software is distributed WITHOUT ANY WARRANTY; without even the
# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
# See the License for more information.
#=============================================================================
12
# (To distribute this file outside of CMake, substitute the full
13 14
#  License text for the above reference.)

15 16 17 18 19 20 21
if(CMAKE_CXX_COMPILER_FORCED)
  # The compiler configuration was forced by the user.
  # Assume the user has configured all compiler information.
  set(CMAKE_CXX_COMPILER_WORKS TRUE)
  return()
endif()

22
include(CMakeTestCompilerCommon)
23

24 25 26 27
# Remove any cached result from an older CMake version.
# We now store this in CMakeCXXCompiler.cmake.
unset(CMAKE_CXX_COMPILER_WORKS CACHE)

28 29
# This file is used by EnableLanguage in cmGlobalGenerator to
# determine that that selected C++ compiler can actually compile
Brad King's avatar
Brad King committed
30
# and link the most basic of programs.   If not, a fatal error
31 32
# is set and cmake stops processing commands and will not generate
# any makefiles or projects.
33
if(NOT CMAKE_CXX_COMPILER_WORKS)
34
  PrintTestCompilerStatus("CXX" "")
35
  file(WRITE ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/testCXXCompiler.cxx
36 37 38 39
    "#ifndef __cplusplus\n"
    "# error \"The CMAKE_CXX_COMPILER is set to a C compiler\"\n"
    "#endif\n"
    "int main(){return 0;}\n")
40
  try_compile(CMAKE_CXX_COMPILER_WORKS ${CMAKE_BINARY_DIR}
41
    ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/testCXXCompiler.cxx
42
    OUTPUT_VARIABLE __CMAKE_CXX_COMPILER_OUTPUT)
43 44 45
  # Move result from cache to normal variable.
  set(CMAKE_CXX_COMPILER_WORKS ${CMAKE_CXX_COMPILER_WORKS})
  unset(CMAKE_CXX_COMPILER_WORKS CACHE)
46
  set(CXX_TEST_WAS_RUN 1)
47
endif()
48

49
if(NOT CMAKE_CXX_COMPILER_WORKS)
50
  PrintTestCompilerStatus("CXX" " -- broken")
51
  file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
52
    "Determining if the CXX compiler works failed with "
53
    "the following output:\n${__CMAKE_CXX_COMPILER_OUTPUT}\n\n")
54
  message(FATAL_ERROR "The C++ compiler \"${CMAKE_CXX_COMPILER}\" "
Brad King's avatar
Brad King committed
55
    "is not able to compile a simple test program.\nIt fails "
56
    "with the following output:\n ${__CMAKE_CXX_COMPILER_OUTPUT}\n\n"
57
    "CMake will not be able to correctly generate this project.")
58
else()
59
  if(CXX_TEST_WAS_RUN)
60
    PrintTestCompilerStatus("CXX" " -- works")
61
    file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
62
      "Determining if the CXX compiler works passed with "
63
      "the following output:\n${__CMAKE_CXX_COMPILER_OUTPUT}\n\n")
64
  endif()
65

66 67 68
  # Try to identify the ABI and configure it into CMakeCXXCompiler.cmake
  include(${CMAKE_ROOT}/Modules/CMakeDetermineCompilerABI.cmake)
  CMAKE_DETERMINE_COMPILER_ABI(CXX ${CMAKE_ROOT}/Modules/CMakeCXXCompilerABI.cpp)
69 70 71
  # Try to identify the compiler features
  include(${CMAKE_ROOT}/Modules/CMakeDetermineCompileFeatures.cmake)
  CMAKE_DETERMINE_COMPILE_FEATURES(CXX)
72 73 74 75 76

  # Re-configure to save learned information.
  configure_file(
    ${CMAKE_ROOT}/Modules/CMakeCXXCompiler.cmake.in
    ${CMAKE_PLATFORM_INFO_DIR}/CMakeCXXCompiler.cmake
77
    @ONLY
78 79 80
    )
  include(${CMAKE_PLATFORM_INFO_DIR}/CMakeCXXCompiler.cmake)

81 82 83 84 85 86
  if(CMAKE_CXX_SIZEOF_DATA_PTR)
    foreach(f ${CMAKE_CXX_ABI_FILES})
      include(${f})
    endforeach()
    unset(CMAKE_CXX_ABI_FILES)
  endif()
87
endif()
88

89
unset(__CMAKE_CXX_COMPILER_OUTPUT)