[Bug c/61846] gcc assumes errno might be negative and issues unnecessary warning

[zbyszek at in dot waw.pl]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61846

Zbigniew Jędrzejewski-Szmek <zbyszek at in dot waw.pl> changed:

           What    |Removed                     |Added
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  Attachment #33148|0                           |1
        is obsolete|                            |

--- Comment #3 from Zbigniew Jędrzejewski-Szmek <zbyszek at in dot waw.pl> ---
Created attachment 33152
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=33152&action=edit
sample program