[Bug 52664] New: x86_64 bit vkd3d broken in --without-mingw build

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=52664

Bug ID: 52664
           Summary: x86_64 bit vkd3d broken in --without-mingw build
           Product: Wine
           Version: unspecified
          Hardware: x86-64
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: directx-d3d
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

Created attachment 71988
  --> https://bugs.winehq.org/attachment.cgi?id=71988
backtrace

When building Wine on x86_64 without mingw, wined3d's Vulkan backend doesn't
work. An assertion is raised when creating a device, here for example when
running the d3d11 tests:

Assertion failed: 1 <= count && count <= VKD3D_VEC4_SIZE, file
../../src/wine/libs/vkd3d/libs/vkd3d-shader/vkd3d_shader_private.h, line 1162

This is a regression caused by 24432a24d5e922cbd824b0af8f7b0c66ff2b66e8.

I investigated the possibility that wined3d and vkd3d use different calling
conventions, but I don't think this is the case. Rather, I suspect that vkd3d
might be built with Unix libc headers and linked against msvcrt.

For some reason I can't get a backtrace with the d3d11 tests (they just exit
without breaking into the debugger), but I can get one with World of Tanks. I
have attached the backtrace.

The reason why I am trying to run a non-mingw build is to investigate the
performance differences between mingw and gcc builds.