I'm using dmd v2.048, WinDbg 5.1.

  I seem to be having trouble, perhaps i can get this cleared up. I'm trying to build a new structure type using math overloads (for testing). My asserts are failing; i need to debug them but can't. I've run 'dmd -gc mysource.d' as per the site, neither gdb nor windbg seems to want to accept it. When i use windbg supplied all i get is this:

> g _Dmain
Module Load: D:\PROGS\D\STR_BIGNUM.EXE  (symbol loading deferred)
Thread Create:  Process=0, Thread=0
Module Load: C:\WINDOWS\system32\NTDLL.DLL  (symbol loading deferred)
Module Load: C:\WINDOWS\SYSTEM32\KERNEL32.DLL  (symbol loading deferred)
Module Load: C:\WINDOWS\SYSTEM32\SHELL32.DLL  (symbol loading deferred)
Module Load: C:\WINDOWS\SYSTEM32\ADVAPI32.DLL  (symbol loading deferred)
Module Load: C:\WINDOWS\SYSTEM32\RPCRT4.DLL  (symbol loading deferred)
Module Load: C:\WINDOWS\SYSTEM32\SECUR32.DLL  (symbol loading deferred)
Module Load: C:\WINDOWS\SYSTEM32\GDI32.DLL  (symbol loading deferred)
Module Load: C:\WINDOWS\SYSTEM32\USER32.DLL  (symbol loading deferred)
Module Load: C:\WINDOWS\SYSTEM32\MSVCRT.DLL  (symbol loading deferred)
Module Load: C:\WINDOWS\SYSTEM32\SHLWAPI.DLL  (symbol loading deferred)
Module Load: C:\WINDOWS\system32\NTDLL.DLL  (no symbols loaded)
Module Load: D:\PROGS\D\STR_BIGNUM.EXE  (symbols loaded)
Module Load: C:\WINDOWS\WINSXS\X86_MICROSOFT.WINDOWS.COMMON-CONTROLS_6595B64144CCF1DF_6.0.2600.5512_X-WW_35D4CE83\COMCTL32.DLL
  (symbol loading deferred)
Module Load: C:\WINDOWS\WINSXS\X86_MICROSOFT.WINDOWS.COMMON-CONTROLS_6595B64144CCF1DF_6.0.2600.5512_X-WW_35D4CE83\COMCTL32.DLL
  (symbol loading deferred)
STR_BIGNUM!__Dmain+0x25:
0x004024c1  bed0404300       mov          esi,004340d0
^C <process stopping...>
>

You could try cv2pdb.

== Quote from Trass3r (un@known.com)'s article
> You could try cv2pdb.

  I'll look it up. I'm trying ddbg, and although it is working so far, there has
to be something better (At least giving it commands and breakpoints)

> I'll look it up. I'm trying ddbg, and although it is working so far, there has to be something better (At least giving it commands and breakpoints)

Isn't ddbg dead?
Your best shot is to debug on Windows using cv2pdb or the upcoming Mago Debugger plugin with Visual Studio.