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# - Check if the function exists.
# CHECK_LIBRARY_EXISTS (LIBRARY FUNCTION LOCATION VARIABLE)
#
# LIBRARY - the name of the library you are looking for
# FUNCTION - the name of the function
# LOCATION - location where the library should be found
# VARIABLE - variable to store the 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_LIBRARIES = list of libraries to link
#=============================================================================
# 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_LIBRARY_EXISTS LIBRARY FUNCTION LOCATION VARIABLE)
if("${VARIABLE}" MATCHES "^${VARIABLE}$")
set(MACRO_CHECK_LIBRARY_EXISTS_DEFINITION
"-DCHECK_FUNCTION_EXISTS=${FUNCTION} ${CMAKE_REQUIRED_FLAGS}")
message(STATUS "Looking for ${FUNCTION} in ${LIBRARY}")
set(CHECK_LIBRARY_EXISTS_LIBRARIES ${LIBRARY})
if(CMAKE_REQUIRED_LIBRARIES)
set(CHECK_LIBRARY_EXISTS_LIBRARIES
${CHECK_LIBRARY_EXISTS_LIBRARIES} ${CMAKE_REQUIRED_LIBRARIES})
endif()
try_compile(${VARIABLE}
${CMAKE_BINARY_DIR}
${CMAKE_ROOT}/Modules/CheckFunctionExists.c
COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS}
LINK_LIBRARIES ${CHECK_LIBRARY_EXISTS_LIBRARIES}
CMAKE_FLAGS
-DCOMPILE_DEFINITIONS:STRING=${MACRO_CHECK_LIBRARY_EXISTS_DEFINITION}
-DLINK_DIRECTORIES:STRING=${LOCATION}
OUTPUT_VARIABLE OUTPUT)
if(${VARIABLE})
message(STATUS "Looking for ${FUNCTION} in ${LIBRARY} - found")
set(${VARIABLE} 1 CACHE INTERNAL "Have library ${LIBRARY}")
file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeOutput.log
"Determining if the function ${FUNCTION} exists in the ${LIBRARY} "
"passed with the following output:\n"
"${OUTPUT}\n\n")
else()
message(STATUS "Looking for ${FUNCTION} in ${LIBRARY} - not found")
set(${VARIABLE} "" CACHE INTERNAL "Have library ${LIBRARY}")
file(APPEND ${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeError.log
"Determining if the function ${FUNCTION} exists in the ${LIBRARY} "
"failed with the following output:\n"
"${OUTPUT}\n\n")
endif()
endif()
endmacro()
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