CMakeTestCCompiler.cmake 3.6 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_C_COMPILER_FORCED)
  # The compiler configuration was forced by the user.
  # Assume the user has configured all compiler information.
  set(CMAKE_C_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 CMakeCCompiler.cmake.
unset(CMAKE_C_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_C_COMPILER_WORKS)
34
  PrintTestCompilerStatus("C" "")
35
  file(WRITE ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/testCCompiler.c
36 37 38
    "#ifdef __cplusplus\n"
    "# error \"The CMAKE_C_COMPILER is set to a C++ compiler\"\n"
    "#endif\n"
39 40 41 42 43 44 45
    "#if defined(__CLASSIC_C__)\n"
    "int main(argc, argv)\n"
    "  int argc;\n"
    "  char* argv[];\n"
    "#else\n"
    "int main(int argc, char* argv[])\n"
    "#endif\n"
46
    "{ (void)argv; return argc-1;}\n")
47
  try_compile(CMAKE_C_COMPILER_WORKS ${CMAKE_BINARY_DIR}
48
    ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/testCCompiler.c
49
    OUTPUT_VARIABLE __CMAKE_C_COMPILER_OUTPUT)
50 51 52
  # Move result from cache to normal variable.
  set(CMAKE_C_COMPILER_WORKS ${CMAKE_C_COMPILER_WORKS})
  unset(CMAKE_C_COMPILER_WORKS CACHE)
53
  set(C_TEST_WAS_RUN 1)
54
endif()
55

56
if(NOT CMAKE_C_COMPILER_WORKS)
57
  PrintTestCompilerStatus("C" " -- broken")
58
  file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
59
    "Determining if the C compiler works failed with "
60
    "the following output:\n${__CMAKE_C_COMPILER_OUTPUT}\n\n")
61
  message(FATAL_ERROR "The C compiler \"${CMAKE_C_COMPILER}\" "
Brad King's avatar
Brad King committed
62
    "is not able to compile a simple test program.\nIt fails "
63
    "with the following output:\n ${__CMAKE_C_COMPILER_OUTPUT}\n\n"
64
    "CMake will not be able to correctly generate this project.")
65
else()
66
  if(C_TEST_WAS_RUN)
67
    PrintTestCompilerStatus("C" " -- works")
68
    file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
69
      "Determining if the C compiler works passed with "
70
      "the following output:\n${__CMAKE_C_COMPILER_OUTPUT}\n\n")
71
  endif()
72

73 74 75
  # Try to identify the ABI and configure it into CMakeCCompiler.cmake
  include(${CMAKE_ROOT}/Modules/CMakeDetermineCompilerABI.cmake)
  CMAKE_DETERMINE_COMPILER_ABI(C ${CMAKE_ROOT}/Modules/CMakeCCompilerABI.c)
76 77 78
  # Try to identify the compiler features
  include(${CMAKE_ROOT}/Modules/CMakeDetermineCompileFeatures.cmake)
  CMAKE_DETERMINE_COMPILE_FEATURES(C)
79 80 81 82 83

  # Re-configure to save learned information.
  configure_file(
    ${CMAKE_ROOT}/Modules/CMakeCCompiler.cmake.in
    ${CMAKE_PLATFORM_INFO_DIR}/CMakeCCompiler.cmake
84
    @ONLY
85 86 87
    )
  include(${CMAKE_PLATFORM_INFO_DIR}/CMakeCCompiler.cmake)

88 89 90 91 92 93
  if(CMAKE_C_SIZEOF_DATA_PTR)
    foreach(f ${CMAKE_C_ABI_FILES})
      include(${f})
    endforeach()
    unset(CMAKE_C_ABI_FILES)
  endif()
94
endif()
Bill Hoffman's avatar
Bill Hoffman committed
95

96
unset(__CMAKE_C_COMPILER_OUTPUT)