On /16/11/16 Andrew Haley wrote: > 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. Thanks, that's helpful. My GCC 5 is built to use binutils 2.25 and gcc 6 uses binutils 2.27. Rebuilding gcc 6 to use 2.25 eliminates the link errors, so gold 1.12 must differ from gold 1.11 somehow. I don't see anything obvious in the Changelog or News files. I suppose the solution is to be more careful when creating libraries, using -ldl and possibly --no-undefined. Is there something special about -ldl? And are there accepted conventiosn for this now? Regards, -- Richard Sewards
