Modules/CMakeTestCCompiler.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
   5 if(CMAKE_C_COMPILER_FORCED)
   6   # The compiler configuration was forced by the user.
   7   # Assume the user has configured all compiler information.
   8   set(CMAKE_C_COMPILER_WORKS TRUE)
   9   return()
  10 endif()
  11
  12 include(CMakeTestCompilerCommon)
  13
  14 # work around enforced code signing and / or missing executable target type
  15 set(__CMAKE_SAVED_TRY_COMPILE_TARGET_TYPE ${CMAKE_TRY_COMPILE_TARGET_TYPE})
  16 if(_CMAKE_FEATURE_DETECTION_TARGET_TYPE)
  17   set(CMAKE_TRY_COMPILE_TARGET_TYPE ${_CMAKE_FEATURE_DETECTION_TARGET_TYPE})
  18 endif()
  19
  20 # Remove any cached result from an older CMake version.
  21 # We now store this in CMakeCCompiler.cmake.
  22 unset(CMAKE_C_COMPILER_WORKS CACHE)
  23
  24 # Try to identify the ABI and configure it into CMakeCCompiler.cmake
  25 include(${CMAKE_ROOT}/Modules/CMakeDetermineCompilerABI.cmake)
  26 CMAKE_DETERMINE_COMPILER_ABI(C ${CMAKE_ROOT}/Modules/CMakeCCompilerABI.c)
  27 if(CMAKE_C_ABI_COMPILED)
  28   # The compiler worked so skip dedicated test below.
  29   set(CMAKE_C_COMPILER_WORKS TRUE)
  30   message(STATUS "Check for working C compiler: ${CMAKE_C_COMPILER} - skipped")
  31 endif()
  32
  33 # This file is used by EnableLanguage in cmGlobalGenerator to
  34 # determine that that 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.
  38 if(NOT CMAKE_C_COMPILER_WORKS)
  39   PrintTestCompilerStatus("C")
  40   __TestCompiler_setTryCompileTargetType()
  41   file(WRITE ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/testCCompiler.c
  42     "#ifdef __cplusplus\n"
  43     "# error \"The CMAKE_C_COMPILER is set to a C++ compiler\"\n"
  44     "#endif\n"
  45     "#if defined(__CLASSIC_C__)\n"
  46     "int main(argc, argv)\n"
  47     "  int argc;\n"
  48     "  char* argv[];\n"
  49     "#else\n"
  50     "int main(int argc, char* argv[])\n"
  51     "#endif\n"
  52     "{ (void)argv; return argc-1;}\n")
  53   # Clear result from normal variable.
  54   unset(CMAKE_C_COMPILER_WORKS)
  55   # Puts test result in cache variable.
  56   try_compile(CMAKE_C_COMPILER_WORKS ${CMAKE_BINARY_DIR}
  57     ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/testCCompiler.c
  58     OUTPUT_VARIABLE __CMAKE_C_COMPILER_OUTPUT)
  59   # Move result from cache to normal variable.
  60   set(CMAKE_C_COMPILER_WORKS ${CMAKE_C_COMPILER_WORKS})
  61   unset(CMAKE_C_COMPILER_WORKS CACHE)
  62   __TestCompiler_restoreTryCompileTargetType()
  63   if(NOT CMAKE_C_COMPILER_WORKS)
  64     PrintTestCompilerResult(CHECK_FAIL "broken")
  65     file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
  66       "Determining if the C compiler works failed with "
  67       "the following output:\n${__CMAKE_C_COMPILER_OUTPUT}\n\n")
  68     string(REPLACE "\n" "\n  " _output "${__CMAKE_C_COMPILER_OUTPUT}")
  69     message(FATAL_ERROR "The C compiler\n  \"${CMAKE_C_COMPILER}\"\n"
  70       "is not able to compile a simple test program.\nIt fails "
  71       "with the following output:\n  ${_output}\n\n"
  72       "CMake will not be able to correctly generate this project.")
  73   endif()
  74   PrintTestCompilerResult(CHECK_PASS "works")
  75   file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
  76     "Determining if the C compiler works passed with "
  77     "the following output:\n${__CMAKE_C_COMPILER_OUTPUT}\n\n")
  78 endif()
  79
  80 # Try to identify the compiler features
  81 include(${CMAKE_ROOT}/Modules/CMakeDetermineCompileFeatures.cmake)
  82 CMAKE_DETERMINE_COMPILE_FEATURES(C)
  83
  84 # Re-configure to save learned information.
  85 configure_file(
  86   ${CMAKE_ROOT}/Modules/CMakeCCompiler.cmake.in
  87   ${CMAKE_PLATFORM_INFO_DIR}/CMakeCCompiler.cmake
  88   @ONLY
  89   )
  90 include(${CMAKE_PLATFORM_INFO_DIR}/CMakeCCompiler.cmake)
  91
  92 if(CMAKE_C_SIZEOF_DATA_PTR)
  93   foreach(f ${CMAKE_C_ABI_FILES})
  94     include(${f})
  95   endforeach()
  96   unset(CMAKE_C_ABI_FILES)
  97 endif()
  98
  99 set(CMAKE_TRY_COMPILE_TARGET_TYPE ${__CMAKE_SAVED_TRY_COMPILE_TARGET_TYPE})
 100 unset(__CMAKE_SAVED_TRY_COMPILE_TARGET_TYPE)
 101 unset(__CMAKE_C_COMPILER_OUTPUT)