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# - Check if the files can be included
#
# CHECK_INCLUDE_FILES(INCLUDE VARIABLE)
#
# INCLUDE - list of files to include
# VARIABLE - variable to return result
#
# 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 2003-2012 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_FILES INCLUDE VARIABLE)
IF("${VARIABLE}" MATCHES "^${VARIABLE}$")
SET(CMAKE_CONFIGURABLE_FILE_CONTENT "/* */\n")
IF(CMAKE_REQUIRED_INCLUDES)
SET(CHECK_INCLUDE_FILES_INCLUDE_DIRS "-DINCLUDE_DIRECTORIES=${CMAKE_REQUIRED_INCLUDES}")
ELSE(CMAKE_REQUIRED_INCLUDES)
SET(CHECK_INCLUDE_FILES_INCLUDE_DIRS)
ENDIF(CMAKE_REQUIRED_INCLUDES)
SET(CHECK_INCLUDE_FILES_CONTENT "/* */\n")
SET(MACRO_CHECK_INCLUDE_FILES_FLAGS ${CMAKE_REQUIRED_FLAGS})
FOREACH(FILE ${INCLUDE})
SET(CMAKE_CONFIGURABLE_FILE_CONTENT
"${CMAKE_CONFIGURABLE_FILE_CONTENT}#include <${FILE}>\n")
ENDFOREACH(FILE)
SET(CMAKE_CONFIGURABLE_FILE_CONTENT
"${CMAKE_CONFIGURABLE_FILE_CONTENT}\n\nint main(){return 0;}\n")
CONFIGURE_FILE("${CMAKE_ROOT}/Modules/CMakeConfigurableFile.in"
"${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/CheckIncludeFiles.c" @ONLY IMMEDIATE)
SET(_INCLUDE ${INCLUDE}) # remove empty elements
IF("${_INCLUDE}" MATCHES "^([^;]+);.+;([^;]+)$")
LIST(LENGTH _INCLUDE _INCLUDE_LEN)
SET(_description "${_INCLUDE_LEN} include files ${CMAKE_MATCH_1}, ..., ${CMAKE_MATCH_2}")
ELSEIF("${_INCLUDE}" MATCHES "^([^;]+);([^;]+)$")
SET(_description "include files ${CMAKE_MATCH_1}, ${CMAKE_MATCH_2}")
ELSE()
SET(_description "include file ${_INCLUDE}")
ENDIF()
MESSAGE(STATUS "Looking for ${_description}")
TRY_COMPILE(${VARIABLE}
${CMAKE_BINARY_DIR}
${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/CheckIncludeFiles.c
COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS}
CMAKE_FLAGS
-DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_INCLUDE_FILES_FLAGS}
"${CHECK_INCLUDE_FILES_INCLUDE_DIRS}"
OUTPUT_VARIABLE OUTPUT)
IF(${VARIABLE})
MESSAGE(STATUS "Looking for ${_description} - found")
SET(${VARIABLE} 1 CACHE INTERNAL "Have include ${INCLUDE}")
FILE(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
"Determining if files ${INCLUDE} "
"exist passed with the following output:\n"
"${OUTPUT}\n\n")
ELSE(${VARIABLE})
MESSAGE(STATUS "Looking for ${_description} - not found.")
SET(${VARIABLE} "" CACHE INTERNAL "Have includes ${INCLUDE}")
FILE(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
"Determining if files ${INCLUDE} "
"exist failed with the following output:\n"
"${OUTPUT}\nSource:\n${CMAKE_CONFIGURABLE_FILE_CONTENT}\n")
ENDIF(${VARIABLE})
ENDIF("${VARIABLE}" MATCHES "^${VARIABLE}$")
ENDMACRO(CHECK_INCLUDE_FILES)
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