[Bug 1885247] Re: Build error in Intel 32-bit hosts

[Peter Maydell]

I suspect an extra uintptr_t cast will fix this:

p = (void *)(uintptr_t)(((uintptr_t)iter->map & TARGET_PAGE_MASK) |
off_in_page);

Which looks kind of ugly but then the code is taking a host void*
(iter->map), casting it to integer to do arithmetic on and then wanting
to get it back to a void* which is inherently going to result in a mess
of casting...

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https://bugs.launchpad.net/bugs/1885247

Title:
  Build error in Intel 32-bit hosts

Status in QEMU:
  New

Bug description:
  The code base is on master, checked out on Thursday June25th 2020,
  0250c595c9d. The build procedure:

  $ mkdir build-gcc
  $ cd build-gcc
  $ ../configure
  $ make

  The build error message is:

    CC      x86_64-softmmu/hw/hyperv/hyperv.o
    CC      x86_64-softmmu/hw/hyperv/hyperv_testdev.o
    CC      x86_64-softmmu/hw/hyperv/vmbus.o
  /home/rtrk/Build/qemu-master/hw/hyperv/vmbus.c: In function ‘gpadl_iter_io’:
  /home/rtrk/Build/qemu-master/hw/hyperv/vmbus.c:386:13: error: cast to pointer 
from integer of different size [-Werror=int-to-pointer-cast]
           p = (void *)(((uintptr_t)iter->map & TARGET_PAGE_MASK) | 
off_in_page);
               ^
  cc1: all warnings being treated as errors
  make[1]: *** [/home/rtrk/Build/qemu-master/rules.mak:69: hw/hyperv/vmbus.o] 
Error 1
  make: *** [Makefile:527: x86_64-softmmu/all] Error 2

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