On 16/11/16 15:35, Richard Sewards wrote: > With gcc 6, it appears I must add "-ldl" when creating libtcl.so > in order for a subsequent link that uses "-ltcl -ldl" will find > dlopen. Without -ldl when creating libtcl.so the subsequent link > fails to find dlopen even though it's invoked with -ldl. With > gcc 5 this is not necessary. This isn't really a GCC thing, it's more to do with the way that the linker interworks with the shared library loader and the --as-needed flag. Use -ldl always and you'll be fine. Andrew.
