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
5if(CMAKE_CXX_COMPILER_FORCED)
6  # The compiler configuration was forced by the user.
7  # Assume the user has configured all compiler information.
8  set(CMAKE_CXX_COMPILER_WORKS TRUE)
9  return()
10endif()
11
12include(CMakeTestCompilerCommon)
13
14# work around enforced code signing and / or missing executable target type
15set(__CMAKE_SAVED_TRY_COMPILE_TARGET_TYPE ${CMAKE_TRY_COMPILE_TARGET_TYPE})
16if(_CMAKE_FEATURE_DETECTION_TARGET_TYPE)
17  set(CMAKE_TRY_COMPILE_TARGET_TYPE ${_CMAKE_FEATURE_DETECTION_TARGET_TYPE})
18endif()
19
20# Remove any cached result from an older CMake version.
21# We now store this in CMakeCXXCompiler.cmake.
22unset(CMAKE_CXX_COMPILER_WORKS CACHE)
23
24# Try to identify the ABI and configure it into CMakeCXXCompiler.cmake
25include(${CMAKE_ROOT}/Modules/CMakeDetermineCompilerABI.cmake)
26CMAKE_DETERMINE_COMPILER_ABI(CXX ${CMAKE_ROOT}/Modules/CMakeCXXCompilerABI.cpp)
27if(CMAKE_CXX_ABI_COMPILED)
28  # The compiler worked so skip dedicated test below.
29  set(CMAKE_CXX_COMPILER_WORKS TRUE)
30  message(STATUS "Check for working CXX compiler: ${CMAKE_CXX_COMPILER} - skipped")
31endif()
32
33# This file is used by EnableLanguage in cmGlobalGenerator to
34# determine that the selected C++ compiler can actually compile
35# and link the most basic of programs.   If not, a fatal error
36# is set and cmake stops processing commands and will not generate
37# any makefiles or projects.
38if(NOT CMAKE_CXX_COMPILER_WORKS)
39  PrintTestCompilerStatus("CXX")
40  __TestCompiler_setTryCompileTargetType()
41  file(WRITE ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/testCXXCompiler.cxx
42    "#ifndef __cplusplus\n"
43    "# error \"The CMAKE_CXX_COMPILER is set to a C compiler\"\n"
44    "#endif\n"
45    "int main(){return 0;}\n")
46  # Clear result from normal variable.
47  unset(CMAKE_CXX_COMPILER_WORKS)
48  # Puts test result in cache variable.
49  try_compile(CMAKE_CXX_COMPILER_WORKS ${CMAKE_BINARY_DIR}
50    ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/testCXXCompiler.cxx
51    OUTPUT_VARIABLE __CMAKE_CXX_COMPILER_OUTPUT)
52  # Move result from cache to normal variable.
53  set(CMAKE_CXX_COMPILER_WORKS ${CMAKE_CXX_COMPILER_WORKS})
54  unset(CMAKE_CXX_COMPILER_WORKS CACHE)
55  __TestCompiler_restoreTryCompileTargetType()
56  if(NOT CMAKE_CXX_COMPILER_WORKS)
57    PrintTestCompilerResult(CHECK_FAIL "broken")
58    file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
59      "Determining if the CXX compiler works failed with "
60      "the following output:\n${__CMAKE_CXX_COMPILER_OUTPUT}\n\n")
61    string(REPLACE "\n" "\n  " _output "${__CMAKE_CXX_COMPILER_OUTPUT}")
62    message(FATAL_ERROR "The C++ compiler\n  \"${CMAKE_CXX_COMPILER}\"\n"
63      "is not able to compile a simple test program.\nIt fails "
64      "with the following output:\n  ${_output}\n\n"
65      "CMake will not be able to correctly generate this project.")
66  endif()
67  PrintTestCompilerResult(CHECK_PASS "works")
68  file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
69    "Determining if the CXX compiler works passed with "
70    "the following output:\n${__CMAKE_CXX_COMPILER_OUTPUT}\n\n")
71endif()
72
73# Try to identify the compiler features
74include(${CMAKE_ROOT}/Modules/CMakeDetermineCompileFeatures.cmake)
75CMAKE_DETERMINE_COMPILE_FEATURES(CXX)
76
77# Re-configure to save learned information.
78configure_file(
79  ${CMAKE_ROOT}/Modules/CMakeCXXCompiler.cmake.in
80  ${CMAKE_PLATFORM_INFO_DIR}/CMakeCXXCompiler.cmake
81  @ONLY
82  )
83include(${CMAKE_PLATFORM_INFO_DIR}/CMakeCXXCompiler.cmake)
84
85if(CMAKE_CXX_SIZEOF_DATA_PTR)
86  foreach(f ${CMAKE_CXX_ABI_FILES})
87    include(${f})
88  endforeach()
89  unset(CMAKE_CXX_ABI_FILES)
90endif()
91
92set(CMAKE_TRY_COMPILE_TARGET_TYPE ${__CMAKE_SAVED_TRY_COMPILE_TARGET_TYPE})
93unset(__CMAKE_SAVED_TRY_COMPILE_TARGET_TYPE)
94unset(__CMAKE_CXX_COMPILER_OUTPUT)
95