[Bug c/77487] gcc reports "file shorter than expected" for regular files on stdin when the offset of fd 0 isn't 0

[pskocik at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77487

pskocik at gmail dot com changed:

           What    |Removed                     |Added
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                 CC|                            |pskocik at gmail dot com

--- Comment #1 from pskocik at gmail dot com ---
Created attachment 39564
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=39564&action=edit
example test

a self-compiling c script -- passes self at an offset to gcc and then runs the
a.out

it should print:

    c: hello world

but instead, there's also the 

    cc1: warning:  is shorter than expected [enabled by default]

line in there