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# - Check which library is needed to link a C function
# find_function_library( <function> <variable> [<library> ...] )
#
# Check which library provides the <function>.
# Sets <variable> to 0 if found in the global libraries.
# Sets <variable> to the library path if found in the provided libraries.
# Raises a FATAL_ERROR if not found.
#
# 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
# CMAKE_REQUIRED_LIBRARIES = list of libraries to link
include( CheckFunctionExists )
macro( find_function_library FUNC VAR )
if( "${VAR}" MATCHES "^${VAR}$" )
CHECK_FUNCTION_EXISTS( ${FUNC} ${VAR} )
if( ${VAR} )
message( STATUS "Found ${FUNC} in global libraries" )
set( ${VAR} 0 CACHE INTERNAL "Found ${FUNC} in global libraries" )# global
else()
foreach( LIB IN ITEMS ${ARGN} )
message( STATUS "Looking for ${FUNC} in ${LIB}" )
find_library( ${LIB}_LIBRARY ${LIB} )
mark_as_advanced( ${LIB}_LIBRARY )
if( ${LIB}_LIBRARY )
unset( ${VAR} CACHE )
set( CMAKE_REQUIRED_LIBRARIES ${${LIB}_LIBRARY} )
CHECK_FUNCTION_EXISTS( ${FUNC} ${VAR} )
set( CMAKE_REQUIRED_LIBRARIES )
if( ${VAR} )
message( STATUS "Found ${FUNC} in ${LIB}: ${${LIB}_LIBRARY}" )
set( ${VAR} ${${LIB}_LIBRARY} CACHE INTERNAL "Found ${FUNC} in ${LIB}" )# lib
break()
endif()
endif()
endforeach()
if( NOT ${VAR} )
message( FATAL_ERROR "Function ${FUNC} not found" )
endif()
endif()
endif()
endmacro( find_function_library )
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