go version go1.4beta1 linux/amd64

With some make-fu is it possible to have SWIG+CGO build a DLL out of a package. This
fixes the issue of external linking not available in Windows.

Basically, applying the following patches to SWIG does the following:
- Mark all structs as __packed__ [1]
- Bind crosscall2 and _cgo_* via DllMain (instead of extern) [2]
- Mark all wrap functions as SWIGEXPORT [3]
- Mark all the functions in the _gc.c file as dynimport name name "mylib.dll"

Once the file is generated/compiled, to get a .dll, I do the following:
- unpack the library
- repack the library minus the _wrap object file
- cc -shared the _wrap object file into a .dll (with linked needed libraries)

Everything does compile after that with no issues.

The issue is that cgo_import_dynamic doesn't properly resolve the symbol in the DLL, but
in the IAT section of the .exe file. This causes the executing program to crash.

I traced the program with IDA and confirmed that. See the thread of go-nuts with lots of
additional informations and IDA outputs [4].

I have no idea why C code using this pragma works fine, but Go code using the variable
generated to the symbol doesn't. Maybe a bug in the PE linker?

Thank you

[1] steeve/swig@e70fce1
[2] steeve/swig@27bb9bd
[3] steeve/swig@2c55397
[4] https://groups.google.com/forum/#!topic/golang-nuts/-M-8X-PLvOw