1 files changed, 47 insertions, 0 deletions
diff --git a/3rdparty/cmake/FindFunctionLibrary.cmake b/3rdparty/cmake/FindFunctionLibrary.cmake
new file mode 100644
index 000000000..f1d32001e
--- /dev/null
+++ b/3rdparty/cmake/FindFunctionLibrary.cmake
@@ -0,0 +1,47 @@
+# - 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 )
+