Hey all,
I'm currently using D for a hook-based project that requires me
to build both a 32bit and 64bit DLL. Naturally, the 32bit DLL
builds fine, however I'm encountering linking issues for the
64bit.
I followed the instructions at
http://wiki.dlang.org/Installing_DMD_on_64-bit_Windows_7_(COFF-compatible)
for setting up 64bit building (albeit I didn't use his
environment variables - I just put the paths into sc.ini
directly), so if there's a problem with my setup, I don't see it.
Here is my build output (I'm using Xamarin Studio with Mono-D, if
that means anything):
---------------------------------------------------------------------------
Building: HookLib (Debug|x64)
Performing main compilation...
Current dictionary:
C:\Development\Projects\EyefinityMaximizer\HookLib
dmd.exe -debug -gc "main.d"
"C:\Development\Projects\EyefinityMaximizer\EyefinityMaximizer\eyemax\WinAPI.d"
"HookLib.def" "user32.lib"
"-IC:\Development\Compilers\D\dmd2\src\phobos"
"-IC:\Development\Compilers\D\dmd2\src\druntime\src"
"-L/IMPLIB:C:\Development\Projects\EyefinityMaximizer\bin\Debug\HookLib.x64.lib"
"-odobj\Debug"
"-ofC:\Development\Projects\EyefinityMaximizer\bin\Debug\HookLib.x64.dll"
-m64
HookLib.def(1) : warning LNK4017: EXETYPE statement not supported
for the target platform; ignored
HookLib.def(2) : warning LNK4017: SUBSYSTEM statement not
supported for the target platform; ignored
HookLib.x64.obj : warning LNK4197: export 'CallWndProc' specified
multiple times; using first specification
Creating library
C:\Development\Projects\EyefinityMaximizer\bin\Debug\HookLib.x64.lib
and object
C:\Development\Projects\EyefinityMaximizer\bin\Debug\HookLib.x64.exp
phobos64.lib(dmain2_4ac_1a5.obj) : error LNK2019: unresolved
external symbol _Dmain referenced in function main
C:\Development\Projects\EyefinityMaximizer\bin\Debug\HookLib.x64.dll
: fatal error LNK1120: 1 unresolved externals
--- errorlevel 1120
Exit code 1120
Build complete -- 1 error, 0 warnings
---------------------------------------------------------------------------
As you can see, there appears to be an issue with my usage of
WinMain() as opposed to just main(). For 32bit building, the
documentation states that the compiler recognizes WinMain and
works accordingly - is this also the case for 64bit building?
Here is my WinMain function, in case I'm doing something wrong
with it:
---------------------------------------------------------------------------
extern(Windows) int WinMain(HINSTANCE hInstance, HINSTANCE
hPrevInstance, LPSTR lpCmdLine, int iCmdShow) {
int result;
void exceptionHandler(Throwable e) { throw e; }
// Init the D runtime
try {
Runtime.initialize(&exceptionHandler);
result = myWinMain(hInstance, hPrevInstance, lpCmdLine,
iCmdShow);
Runtime.terminate(&exceptionHandler);
} catch (Throwable e) {
MessageBoxA(null, e.toString().toStringz, "Error", MB_OK |
MB_ICONEXCLAMATION);
result = 0;
}
return result;
}
---------------------------------------------------------------------------
Any assistance would be appreciated, as this project is stalled
until I can build 64bit binaries.
Thanks and regards,
Trey
