[Bug regression/83038] [8 regression] warning at random points in the input (array subscript -1 is below array bounds)

[gerald at pfeifer dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83038

--- Comment #2 from Gerald Pfeifer <gerald at pfeifer dot com> ---
Created attachment 42643
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=42643&action=edit
Full preprocesssed source file

(In reply to David Malcolm from comment #1)
> This is a .i file; have the source files it refers to been edited since the
> .i file was generated?

Just the .i file I stripped down a little.

Here is the full original.  This shows

config.c: In function ‘ConfigureDevicesDlgProc’:
config.c:303:29: warning: array subscript -1 is below array bounds of
‘DIDEVICEOBJECTINSTANCEW[256] {aka struct DIDEVICEOBJECTINSTANCEW[256]}’
[-Warray-bounds]
     DIDEVICEOBJECTINSTANCEW ddo = device->ddo[obj];
                             ^~~

Note, no subscript (nor -1) present where the ^~~ points to.