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#
# Checks whether this platform has a given preprocessor directive
#
# VARIABLE - variable to store the result to
#
get_filename_component(_CheckCPPDirective_DIR "${CMAKE_CURRENT_LIST_FILE}" PATH)
macro(CHECK_CPP_DIRECTIVE_EXISTS DIRECTIVE VARIABLE)
if(NOT DEFINED "HAVE_${VARIABLE}")
message(STATUS "Checking to see if this platform has the ${DIRECTIVE} C-Preprocessor directive")
set(DIRECTIVE ${DIRECTIVE})
configure_file(${_CheckCPPDirective_DIR}/CheckCPPDirectiveExists.cxx.in
${CMAKE_BINARY_DIR}/CMakeFiles/CMakeTmp/CheckCPPDirectiveExists.cxx)
try_compile(${VARIABLE}
${CMAKE_BINARY_DIR}
${CMAKE_BINARY_DIR}/CMakeFiles/CMakeTmp/CheckCPPDirectiveExists.cxx
OUTPUT_VARIABLE OUTPUT)
if(${VARIABLE})
set(HAVE_${VARIABLE} TRUE CACHE INTERNAL " ")
message(STATUS "Checking to see if this platform supports has the ${DIRECTIVE} C-Preprocessor directive - yes")
file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
"Checking to see if this platform supports has the ${DIRECTIVE} C-Preprocessor directive with "
"the following output:\n${OUTPUT}\n\n")
else()
message(STATUS "Checking to see if this platform supports has the ${DIRECTIVE} C-Preprocessor directive - no")
file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
"Checking to see if this platform supports has the ${DIRECTIVE} C-Preprocessor directive with "
"the following output:\n${OUTPUT}\n\n")
endif()
endif()
endmacro()
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