CMakeTestCCompiler.cmake 2.15 KB
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# This file is used by EnableLanguage in cmGlobalGenerator to
# determine that that selected C compiler can actually compile
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# and link the most basic of programs.   If not, a fatal error
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# is set and cmake stops processing commands and will not generate
# any makefiles or projects.
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IF(NOT CMAKE_C_COMPILER_WORKS)
  MESSAGE(STATUS "Check for working C compiler: ${CMAKE_C_COMPILER}")
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  FILE(WRITE ${CMAKE_BINARY_DIR}/CMakeFiles/CMakeTmp/testCCompiler.c
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    "#ifdef __cplusplus\n"
    "# error \"The CMAKE_C_COMPILER is set to a C++ compiler\"\n"
    "#endif\n"
    "int main(){return 0;}\n")
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  TRY_COMPILE(CMAKE_C_COMPILER_WORKS ${CMAKE_BINARY_DIR} 
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    ${CMAKE_BINARY_DIR}/CMakeFiles/CMakeTmp/testCCompiler.c
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    OUTPUT_VARIABLE OUTPUT) 
  SET(C_TEST_WAS_RUN 1)
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ENDIF(NOT CMAKE_C_COMPILER_WORKS)

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IF(NOT CMAKE_C_COMPILER_WORKS)
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  MESSAGE(STATUS "Check for working C compiler: ${CMAKE_C_COMPILER} -- broken")
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  FILE(APPEND ${CMAKE_BINARY_DIR}/CMakeFiles/CMakeError.log
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    "Determining if the C compiler works failed with "
    "the following output:\n${OUTPUT}\n\n")
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  MESSAGE(FATAL_ERROR "The C compiler \"${CMAKE_C_COMPILER}\" "
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    "is not able to compile a simple test program.\nIt fails "
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    "with the following output:\n ${OUTPUT}\n\n"
    "CMake will not be able to correctly generate this project.")
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ELSE(NOT CMAKE_C_COMPILER_WORKS)
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  IF(C_TEST_WAS_RUN)
    MESSAGE(STATUS "Check for working C compiler: ${CMAKE_C_COMPILER} -- works")
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    FILE(APPEND ${CMAKE_BINARY_DIR}/CMakeFiles/CMakeOutput.log
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      "Determining if the C compiler works passed with "
      "the following output:\n${OUTPUT}\n\n") 
  ENDIF(C_TEST_WAS_RUN)
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  INCLUDE (${CMAKE_ROOT}/Modules/CheckTypeSize.cmake)
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  # Check the size of void*.  This used to be "void *" but icc expands the *.
  CHECK_TYPE_SIZE("void*"  CMAKE_SIZEOF_VOID_P)
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  SET(CMAKE_C_COMPILER_WORKS 1 CACHE INTERNAL "")
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  # re-configure this file CMakeCCompiler.cmake so that it gets
  # the value for CMAKE_SIZEOF_VOID_P
  # configure variables set in this file for fast reload later on
  CONFIGURE_FILE(${CMAKE_ROOT}/Modules/CMakeCCompiler.cmake.in 
    ${CMAKE_BINARY_DIR}/CMakeFiles/CMakeCCompiler.cmake IMMEDIATE)
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ENDIF(NOT CMAKE_C_COMPILER_WORKS)
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