Bug in calling C function on Windows?

[Bradley Smith]

I'm experimenting with using D for Java Native Interface (JNI) 
programming. I may have encountered a bug with GDC calling a C function 
in the JavaVM invocation API. The following is the relevant code.

JNI_CreateJavaVM(&jvm, cast(void**)&env, &vm_args);
version (gdcBugWorkaround) {
   // Any statement can go here (even "int x = 0;")
   assert (jvm !is null, "JNI_CreateJavaVM failed");
}

For some reason, the program will crash unless some kinds of statements 
follow the call to JNI_CreateJavaVM. Is this a bug?

The full code and a build.bat script are in the attached zip. I'm using 
gdc --version: "gdc (GCC) 3.4.5 (mingw special) (gdc 0.21, using dmd 1.00)"

Thanks,
   Bradley
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