Undefined symbol?

[John Colvin via Digitalmars-d-learn]

On Wednesday, 18 February 2015 at 08:55:51 UTC, Tofu Ninja wrote:
> When I compile my project in release dmd suddenly starts 
> complains about missing symbols that look like they are from 
> phobos.
>
> Symbol Undefined 
> _D3std9exception134__T12errnoEnforceTbVAyaa50_433a5c445c646d64325c77696e646f77735c62696e5c2e2e5cA7E6C89D7777F0A958C3336C905AF5DE
>
> Any idea what is causing it and what a fix might be?

These errors are normally caused by combining object files or 
libraries that were compiled by different compiler versions. The 
biggest mistake is accidentally linking to an older/newer version 
of phobos.