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

            Bug ID: 83038
           Summary: [8 regression] warning at random points in the input
                    (array subscript -1 is below array bounds)
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: regression
          Assignee: unassigned at gcc dot gnu.org
          Reporter: gerald at pfeifer dot com
                CC: dmalcolm at redhat dot com, msebor at gcc dot gnu.org,
                    polacek at redhat dot com
  Target Milestone: ---

Created attachment 42641
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=42641&action=edit
Testcase

A couple of days the attached testcase started issuing a new warning
which is actually wrong -- or at least points to a completely bogus
location.

In fact, trying to trim this down, the message started pointing to a
different location, until I reached a case which definitely makes no
sense at all:

  gcc -c -o config.o -O2 -g -Wall c2.i
  config.c: In function ‘ConfigureDevicesDlgProc’:
  config.c:132:29: warning: array subscript -1 is below array bounds of   
  ‘DIDEVICEOBJECTINSTANCEW[256] {aka struct DIDEVICEOBJECTINSTANCEW[256]}’  
  [-Warray-bounds]
     /* Keep the action and text in the listview item */
                             ^~~

This was on an i386-unknown-freebsd10 system, but compiling the testcase
on amd64-unknown-freebsd11 I got the same (at a different location).

(This is from Wine, where I build the latest git code nightly with the
latest version of GCC head.)

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