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# - Check if the include file exists.
# CHECK_INCLUDE_FILE_CXX(INCLUDE VARIABLE)
#
# 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.
#
# The following variables may be set before calling this macro to
# modify the way the check is run:
#
# CMAKE_REQUIRED_FLAGS = string of compile command line flags
# CMAKE_REQUIRED_DEFINITIONS = list of macros to define (-DFOO=bar)
# CMAKE_REQUIRED_INCLUDES = list of include directories
#
#=============================================================================
# Copyright 2002-2009 Kitware, Inc.
#
# 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.
#=============================================================================
# (To distribute this file outside of CMake, substitute the full
# License text for the above reference.)
macro(CHECK_INCLUDE_FILE_CXX INCLUDE VARIABLE)
if("${VARIABLE}" MATCHES "^${VARIABLE}$")
if(CMAKE_REQUIRED_INCLUDES)
set(CHECK_INCLUDE_FILE_CXX_INCLUDE_DIRS "-DINCLUDE_DIRECTORIES=${CMAKE_REQUIRED_INCLUDES}")
else(CMAKE_REQUIRED_INCLUDES)
set(CHECK_INCLUDE_FILE_CXX_INCLUDE_DIRS)
endif(CMAKE_REQUIRED_INCLUDES)
set(MACRO_CHECK_INCLUDE_FILE_FLAGS ${CMAKE_REQUIRED_FLAGS})
set(CHECK_INCLUDE_FILE_VAR ${INCLUDE})
configure_file(${CMAKE_ROOT}/Modules/CheckIncludeFile.cxx.in
${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/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}
${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/CheckIncludeFile.cxx
COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS}
CMAKE_FLAGS
-DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_INCLUDE_FILE_FLAGS}
"${CHECK_INCLUDE_FILE_CXX_INCLUDE_DIRS}"
OUTPUT_VARIABLE OUTPUT)
if(${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 ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/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 ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/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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