Static linking D apps for distribution to the cloud, etc.

[David J Kordsmeier]

Hi forums, I have what should be a simple question.  I have an 
application which I would like to distribute to the cloud onto a 
linux system which I will not have root access.  I thought it 
should be easier for me to perform static linking of this D app 
instead of packing the application with library dependencies.

If I try to do this, using my most simple example below, with 
ldc2 (1.15.0) using the --static flag, I get various warnings: 
warning: Using 'dlopen' in statically linked applications 
requires at runtime the shared libraries from the glibc version 
used for linking
warning: Using 'gethostbyaddr' in statically linked applications 
requires at runtime the shared libraries from the glibc version 
used for linking

If I use gdc (4.9.0 2.065) for this, I get linker errors, such 
as: undefined reference to `curl_easy_setopt'

I'll go back and review the best practices for using curl with 
phobos.  I still am struggling to make this work, as something 
that would be relatively simple in C to perform (statically link 
to any libraries I would like).  Without being an expert on 
phobos library construction, what is the recommended practice for 
app distribution?  Does anyone have a great sample project to 
point to?  I've looked at the dlang-tour 
https://github.com/dlang-tour/core/blob/master/dub.sdl , and this 
indeed seems like the right track, however, I still get the curl 
warnings and the app won't run.

I have also tried building and dynamically linking, which works 
fine, but I've had trouble pulling the dependent libraries for 
distribution, and namely having trouble with finding curl at 
runtime.

```
import std.net.curl, std.stdio;
int main() {
   auto http = HTTP("dlang.org");
   http.onReceiveHeader = (in char[] key, in char[] value) { 
writeln(key, ": ", value);  };
   http.onReceive = (ubyte[] data) { /+ drop +/ return 
data.length;  };
   http.perform();
   return 0;
}
```