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#
# Check if the symbol exists in include files
#
# CHECK_FUNCTIONWITHHEADER_EXISTS - macro which checks the symbol exists in include files.
# SYMBOL - symbol
# FILES - include files to check
# VARIABLE - variable to return result
# ... - additional arguments will be interpreted as additional libraries to link during testing.
#
macro(CHECK_FUNCTIONWITHHEADER_EXISTS SYMBOL FILES VARIABLE)
if(NOT DEFINED "${VARIABLE}")
set(CHECK_SYMBOL_EXISTS_CONTENT "/* */\n")
set(MACRO_CHECK_SYMBOL_EXISTS_FLAGS ${CMAKE_REQUIRED_FLAGS})
if(CMAKE_REQUIRED_LIBRARIES)
set(CHECK_SYMBOL_EXISTS_LIBS
"-DLINK_LIBRARIES:STRING=${CMAKE_REQUIRED_LIBRARIES};${ARGN}")
endif()
foreach(FILE ${FILES})
set(CHECK_SYMBOL_EXISTS_CONTENT
"${CHECK_SYMBOL_EXISTS_CONTENT}#include <${FILE}>\n")
endforeach()
set(CHECK_SYMBOL_EXISTS_CONTENT
"${CHECK_SYMBOL_EXISTS_CONTENT}\nint main()\n{\n${SYMBOL};return 0;\n}\n")
file(WRITE ${CMAKE_BINARY_DIR}/CMakeTmp/CheckSymbolExists.cxx
"${CHECK_SYMBOL_EXISTS_CONTENT}")
message(STATUS "Looking for prototype of ${SYMBOL}")
try_compile(${VARIABLE}
"${CMAKE_BINARY_DIR}"
"${CMAKE_BINARY_DIR}/CMakeTmp/CheckSymbolExists.cxx"
CMAKE_FLAGS
-DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_SYMBOL_EXISTS_FLAGS}
"-DINCLUDE_DIRECTORIES:STRING=${CMAKE_REQUIRED_INCLUDES}"
"${CHECK_SYMBOL_EXISTS_LIBS}"
${DCMTK_TRY_COMPILE_REQUIRED_CMAKE_FLAGS}
OUTPUT_VARIABLE OUTPUT)
if(${VARIABLE})
message(STATUS "Looking for prototype of ${SYMBOL} - found")
set(${VARIABLE} 1 CACHE INTERNAL "Have symbol ${SYMBOL}")
file(APPEND "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log"
"Determining if the ${SYMBOL} "
"exist passed with the following output:\n"
"${OUTPUT}\nFile ${CMAKE_BINARY_DIR}/CMakeTmp/CheckSymbolExists.ccc:\n"
"${CHECK_SYMBOL_EXISTS_CONTENT}\n")
else()
message(STATUS "Looking for prototype of ${SYMBOL} - not found.")
set(${VARIABLE} "" CACHE INTERNAL "Have symbol ${SYMBOL}")
file(APPEND "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log"
"Determining if the ${SYMBOL} "
"exist failed with the following output:\n"
"${OUTPUT}\nFile ${CMAKE_BINARY_DIR}/CMakeTmp/CheckSymbolExists.cxx:\n"
"${CHECK_SYMBOL_EXISTS_CONTENT}\n")
endif()
endif()
endmacro()
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