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#
# Check if the include file exists.
#
# CHECK_INCLUDE_FILE - macro which checks the include file exists.
# INCLUDE - name of include file
# VARIABLE - variable to return result
#
# an optional third argument is the CFlags to add to the compile line
# or you can use CMAKE_REQUIRED_FLAGS
#
MACRO(CHECK_INCLUDE_FILE_CXX INCLUDE VARIABLE)
IF("${VARIABLE}" MATCHES "^${VARIABLE}$")
SET(MACRO_CHECK_INCLUDE_FILE_FLAGS ${CMAKE_REQUIRED_FLAGS})
SET(CHECK_INCLUDE_FILE_VAR ${INCLUDE})
CONFIGURE_FILE(${CMAKE_ROOT}/Modules/CheckIncludeFile.cxx.in
${CMAKE_BINARY_DIR}/CMakeTmp/CheckIncludeFile.cxx IMMEDIATE)
MESSAGE(STATUS "Looking for C++ include ${INCLUDE}")
IF(${ARGC} EQUAL 3)
SET(CMAKE_CXX_FLAGS_SAVE ${CMAKE_CXX_FLAGS})
SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${ARGV2}")
ENDIF(${ARGC} EQUAL 3)
TRY_COMPILE(${VARIABLE}
${CMAKE_BINARY_DIR}
${CMAKE_BINARY_DIR}/CMakeTmp/CheckIncludeFile.cxx
CMAKE_FLAGS
-DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_INCLUDE_FILE_FLAGS}
OUTPUT_VARIABLE OUTPUT)
IF(${ARGC} EQUAL 3)
SET(CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS_SAVE})
ENDIF(${ARGC} EQUAL 3)
IF(${VARIABLE})
MESSAGE(STATUS "Looking for C++ include ${INCLUDE} - found")
SET(${VARIABLE} 1 CACHE INTERNAL "Have include ${INCLUDE}")
FILE(APPEND ${CMAKE_BINARY_DIR}/CMakeFiles/CMakeOutput.log
"Determining if the include file ${INCLUDE} "
"exists passed with the following output:\n"
"${OUTPUT}\n\n")
ELSE(${VARIABLE})
MESSAGE(STATUS "Looking for C++ include ${INCLUDE} - not found")
SET(${VARIABLE} "" CACHE INTERNAL "Have include ${INCLUDE}")
FILE(APPEND ${CMAKE_BINARY_DIR}/CMakeFiles/CMakeError.log
"Determining if the include file ${INCLUDE} "
"exists failed with the following output:\n"
"${OUTPUT}\n\n")
ENDIF(${VARIABLE})
ENDIF("${VARIABLE}" MATCHES "^${VARIABLE}$")
ENDMACRO(CHECK_INCLUDE_FILE_CXX)
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