Re: [PATCH v2 0/1] MR7460: propsys/tests: Add broken for unexpected value in windows 7.

[Bernhard Übelacker (＠bernhardu)]

On Mon Mar  3 04:22:16 2025 +0000, Bernhard Übelacker wrote:
> > This isn't just a precision issue, but completely garbage output, right?
>
> I think this windows version handles `VT_R4` and `VT_R8` the same.
> Therefore VT_R4 returns the interpretation as a double instead of a float.
> This is what gdb shows when placing the 0.125 to some memory and casting
> this to float or double:
> $ gdb -q --args tools/makedep 
> Reading symbols from tools/makedep...
> (gdb) starti
> ...
> (gdb) set *(long long*)$rsp = 0
> (gdb) x/8xb $rsp
> 0x7fffffffd600: 0x00    0x00    0x00    0x00    0x00    0x00    0x00    0x00
> (gdb) set *(float*)$rsp = 0.125
> (gdb) x/8xb $rsp
> 0x7fffffffd600: 0x00    0x00    0x00    0x3e    0x00    0x00    0x00    0x00
> (gdb) print *(float*)$rsp
> $1 = 0.125
> (gdb) print *(double*)$rsp
> $2 = 5.1392085562440189e-315
> (gdb)
>
> So it seems not completely garbage, just the bits from a float
> interpreted as double.
> I will try to push a check_PropVariantToBSTR2 version later.

I pushed v2, is this somewhere near what you suggested?