Accessing D globals in C

[Thad via Digitalmars-d-learn]

Hello,
I am mixing some of my existing C code with D via static linking. 
I can access C globals from D using __gshared but I cannot seem 
to be able to access a D global from within the C code. Keep in 
mind I am a novice programmer. Everything is built with gcc and 
gdc under Linux.

e.g.
//D code
import std.stdio;

extern (C) void print_global();

__gshared int global = 5;

void main(){
     writeln("The global value is: ", global);
     print_global(); //Call our C code
}

//C code
#include <stdio.h>
int global;

void print_global(){
	printf("Global value: %d\n", global);
	return;
}

If I compile and link the above two object files, the 
print_global function prints "Global value: 0". But of course, 
the writeln in the D code prints 5. If I put "extern int global;" 
or remove "int global" in the C file, gdc exits with:
staticdC.o: In function `print_global':
staticdC.c:(.text+0xa5): undefined reference to `global'

Am I missing something? Or is accessing D globals from C not 
possible?