backward compatibility

Author: arahlin

cmake/Spt3gIncludes.cmake

@@ -58,9 +58,11 @@ endmacro(add_spt3g_library lib_name)
 macro(add_spt3g_module lib_name)
 	set(mod_name "_lib${lib_name}")
 	pybind11_add_module(${mod_name} MODULE WITH_SOABI ${ARGN})
-	if (NOT ${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
-		# Assume Linux-style ld linker
-		target_link_options(${mod_name} PUBLIC "LINKER:--no-as-needed")
+	# Assume Linux-style ld linker
+	if(${CMAKE_VERSION} VERSION_GREATER_EQUAL 3.17)
+		target_link_options(${prog_name} PUBLIC "LINKER:--no-as-needed")
+	else()
+		set_target_properties(${prog_name} PROPERTIES LINK_FLAGS "-Wl,--no-as-needed")
 	endif()
 	target_link_libraries(${mod_name} PUBLIC ${lib_name})
 	set_target_properties(${mod_name} PROPERTIES LIBRARY_OUTPUT_DIRECTORY ${SPT3G_MODULE_DIR})