The runtime linker's processing of a filter defers the loading of a filtee until a reference to a symbol within the filter has occurred. This implementation is analogous to the filter performing a dlopen(3DL) on each of its filtees as they are required. This implementation accounts for differences in dependency reporting that can be produced by tools such as ldd(1).
The link-editor's -z loadfltr option can be used when creating a filter to cause the immediate processing of its filtees at runtime. In addition, the immediate processing of any filtees within a process can be triggered by setting the
LD_LOADFLTR environment variable to any value.