Modules/CheckIncludeFile.cmake

   1 #
   2 # Check if the include file exists.
   3 #
   4 # CHECK_INCLUDE_FILE - macro which checks the include file exists.
   5 # INCLUDE - name of include file
   6 # VARIABLE - variable to return result
   7 #
   8
   9 MACRO(CHECK_INCLUDE_FILE INCLUDE VARIABLE)
  10   IF("${VARIABLE}" MATCHES "^${VARIABLE}$")
  11     SET(MACRO_CHECK_INCLUDE_FILE_FLAGS ${CMAKE_REQUIRED_FLAGS})
  12     SET(CHECK_INCLUDE_FILE_VAR ${INCLUDE})
  13     CONFIGURE_FILE(${CMAKE_ROOT}/Modules/CheckIncludeFile.c.in
  14       ${CMAKE_BINARY_DIR}/CMakeTmp/CheckIncludeFile.c IMMEDIATE)
  15     MESSAGE(STATUS "Looking for ${INCLUDE}")
  16     IF(${ARGC} EQUAL 3)
  17       SET(CMAKE_C_FLAGS_SAVE ${CMAKE_C_FLAGS})
  18       SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${ARGV2}")
  19     ENDIF(${ARGC} EQUAL 3)
  20
  21     TRY_COMPILE(${VARIABLE}
  22       ${CMAKE_BINARY_DIR}
  23       ${CMAKE_BINARY_DIR}/CMakeTmp/CheckIncludeFile.c
  24       CMAKE_FLAGS
  25       -DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_INCLUDE_FILE_FLAGS}
  26       OUTPUT_VARIABLE OUTPUT)
  27
  28     IF(${ARGC} EQUAL 3)
  29       SET(CMAKE_C_FLAGS ${CMAKE_C_FLAGS_SAVE})
  30     ENDIF(${ARGC} EQUAL 3)
  31
  32     IF(${VARIABLE})
  33       MESSAGE(STATUS "Looking for ${INCLUDE} - found")
  34       SET(${VARIABLE} 1 CACHE INTERNAL "Have include ${INCLUDE}")
  35       FILE(APPEND ${CMAKE_BINARY_DIR}/CMakeOutput.log
  36         "Determining if the include file ${INCLUDE} "
  37         "exists passed with the following output:\n"
  38         "${OUTPUT}\n\n")
  39     ELSE(${VARIABLE})
  40       MESSAGE(STATUS "Looking for ${INCLUDE} - not found.")
  41       SET(${VARIABLE} "" CACHE INTERNAL "Have include ${INCLUDE}")
  42       FILE(APPEND ${CMAKE_BINARY_DIR}/CMakeError.log
  43         "Determining if the include file ${INCLUDE} "
  44         "exists failed with the following output:\n"
  45         "${OUTPUT}\n\n")
  46     ENDIF(${VARIABLE})
  47   ENDIF("${VARIABLE}" MATCHES "^${VARIABLE}$")
  48 ENDMACRO(CHECK_INCLUDE_FILE)