I'm trying to compile a small test program: module MacOS.tf; import std.stdio; import core.runtime; void main() { void* vhandle = Runtime.loadLibrary("igvideo"); } on Mac OSX Catalina, and I am getting the following error: (dmd-2.090.1) dmd tf.d Undefined symbols for architecture x86_64: "_rt_loadLibrary", referenced from: __D4core7runtime7Runtime__T11loadLibraryZQoFMxAaZPv in tf.o ld: symbol(s) not found for architecture x86_64 clang: error: linker command failed with exit code 1 (use -v to see invocation) Error: linker exited with status 1 This is similar to bug #19801, but a much simpler case.
Does it work if you do `dmd -defaultlib=libphobos2.so` ?
Thanks for the comment but no, doesn't help :(
OK, I know that helps on Linux but not mac I guess :( will have to wait till someone else gets on.
Introduced by https://github.com/dlang/druntime/pull/593 The symbol is available on Linux but not OSX. We can (should) make it available on OSX, because linker errors are not user friendly. But even if we make it available on OSX, it is not implemented, so you'll have better luck calling `dlopen` / `dlsym` directly.
Actually, it works on Windows as well. And while linker errors are not, as you say, user friendly, even worse, I think, is to add it but not implement it. Is the fact it only works on Windows (and Linux I guess) documented anywhere?
I was having the same error with ldc2 and adding '-link-defaultlib-shared' fixed it: ldc2 -link-defaultlib-shared tf.d Is there something similar to that flag for dmd, or is that only for ldc2? https://github.com/ldc-developers/ldc/issues/3331
This is a duplicate of https://issues.dlang.org/show_bug.cgi?id=16391. *** This issue has been marked as a duplicate of issue 16391 ***
It works for LDC, with shared druntime only (i.e., not with static druntime), because it has proper shared druntime support on Mac too, unlike DMD. It's using a generalized `rt.sections_elf_shared` in druntime for Mac targets. So https://github.com/dlang/druntime/pull/2322 would fix this, but needs compiler support from DMD.