multiple definition of `IID_ID3D12Device'

[Rarity1]

When compiling with mingw64 and using both official (this project) directxtk12 and the official (github project) directx-headers "IID_ID3D12Device" is defined twice.

Once in 'd3d12.h' (line 38576) of the directx-headers header file and again in 'ResourceUploadBatch.cpp' (line 21) in directxtk12 source file.

[walbourn]

What version of MinGW are you using?

[walbourn]

I probably need to change:

#ifdef __MINGW32__
const GUID IID_ID3D12Device = { 0x189819f1, 0x1db6, 0x4b57, { 0xbe, 0x54, 0x18, 0x21, 0x33, 0x9b, 0x85, 0xf7 } };
#endif

to

#if defined(__MINGW32__) && !defined(USING_DIRECTX_HEADERS)
const GUID IID_ID3D12Device = { 0x189819f1, 0x1db6, 0x4b57, { 0xbe, 0x54, 0x18, 0x21, 0x33, 0x9b, 0x85, 0xf7 } };
#endif

[walbourn]

I just tried with MinGW 16.1.0 and didn't get any errors or warnings about a dup.

That said, I don't get any errors with the change above, so I'll do that.

[walbourn]

It does fail with 14.2.0 when I make that change, however

C:/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/14.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: CMakeFiles/DirectXTK12.dir/Src/ResourceUploadBatch.cpp.obj:ResourceUploadBatch.cpp:(.rdata$.refptr.IID_ID3D12Device[.refptr.IID_ID3D12Device]+0x0): undefined reference to `IID_ID3D12Device'

[walbourn]

16.1.0 has it in libdxguid.a. 14.2. 0 does not. I need to figure out which version introduced it.

UPDATE: 15.3.0 doesn't have it either.

I think I'll go with:

#if defined(__MINGW32__) && (__GNUC__ < 16)
const GUID IID_ID3D12Device = { 0x189819f1, 0x1db6, 0x4b57, { 0xbe, 0x54, 0x18, 0x21, 0x33, 0x9b, 0x85, 0xf7 } };
#endif