_rt_loadLibrary symbol not found

[jda-iocom]

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:

(ldc-1.20.0) ldc2 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: /usr/bin/cc failed with status: 1

[dnadlinger]

Are you linking against the shared version of druntime?

[jda-iocom]

No idea! That's all I'm typing in - ldc2 tf.d

[kinke]

Then try with -link-defaultlib-shared.

[jda-iocom]

Nice! That fixed it. Should I leave this bug opened though?

[kinke]

There's an upstream issue wrt. this. It doesn't apply to LDC, as we use the same proper shared-libs mechanism for Mac as on Linux.

According to the comment for Runtime.loadLibrary(), I wouldn't assume that the function is only available in the shared libs though (on Linux too), and especially wouldn't expect an ugly linker error when using static druntime. So that might be worth another issue, upstream though as not really LDC-specific.