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# - Check if the files can be included
#
# CHECK_INCLUDE_FILES(INCLUDE VARIABLE)
# - macro which checks the include file exists.
# INCLUDE - list of files to include
# VARIABLE - variable to return result
#
# If CMAKE_REQUIRED_FLAGS is set then those flags will be passed into the
# compile of the program
MACRO(CHECK_INCLUDE_FILES INCLUDE VARIABLE)
IF("${VARIABLE}" MATCHES "^${VARIABLE}$")
SET(CHECK_INCLUDE_FILES_CONTENT "/* */\n")
SET(MACRO_CHECK_INCLUDE_FILES_FLAGS ${CMAKE_REQUIRED_FLAGS})
FOREACH(FILE ${INCLUDE})
SET(CHECK_INCLUDE_FILES_CONTENT
"${CHECK_INCLUDE_FILES_CONTENT}#include <${FILE}>\n")
ENDFOREACH(FILE)
SET(CHECK_INCLUDE_FILES_CONTENT
"${CHECK_INCLUDE_FILES_CONTENT}\n\nint main(){return 0;}\n")
FILE(WRITE ${CMAKE_BINARY_DIR}/CMakeTmp/CheckIncludeFiles.c
"${CHECK_INCLUDE_FILES_CONTENT}")
MESSAGE(STATUS "Looking for include files ${VARIABLE}")
TRY_COMPILE(${VARIABLE}
${CMAKE_BINARY_DIR}
${CMAKE_BINARY_DIR}/CMakeTmp/CheckIncludeFiles.c
CMAKE_FLAGS
-DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_INCLUDE_FILES_FLAGS}
OUTPUT_VARIABLE OUTPUT)
IF(${VARIABLE})
MESSAGE(STATUS "Looking for include files ${VARIABLE} - found")
SET(${VARIABLE} 1 CACHE INTERNAL "Have include ${VARIABLE}")
FILE(APPEND ${CMAKE_BINARY_DIR}/CMakeFiles/CMakeOutput.log
"Determining if files ${INCLUDE} "
"exist passed with the following output:\n"
"${OUTPUT}\n\n")
ELSE(${VARIABLE})
MESSAGE(STATUS "Looking for include files ${VARIABLE} - not found.")
SET(${VARIABLE} "" CACHE INTERNAL "Have includes ${VARIABLE}")
FILE(APPEND ${CMAKE_BINARY_DIR}/CMakeFiles/CMakeError.log
"Determining if files ${INCLUDE} "
"exist failed with the following output:\n"
"${OUTPUT}\nSource:\n${CHECK_INCLUDE_FILES_CONTENT}\n")
ENDIF(${VARIABLE})
ENDIF("${VARIABLE}" MATCHES "^${VARIABLE}$")
ENDMACRO(CHECK_INCLUDE_FILES)
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