https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91667
Bug ID: 91667
Summary: bogus -Wformat-overflow warning
Product: gcc
Version: 9.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: jbeulich at novell dot com
Target Milestone: ---
Created attachment 46829
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=46829&action=edit
testcase
The attached example causes undue warnings - arrays of <N> chars without nul
terminator ought to not cause such a warning when the format specifier is
%.<N>s.
Observations:
- requires -O1 or higher
- no warning (as expected) on the one printf() after the loop
- warning disappears with one array element removed (loop gets unrolled in this
case)
- warning disappears when un-commenting the commented out array element
For the full original file the issue was noticed with see
https://xenbits.xen.org/gitweb/?p=xen.git;a=blob;f=tools/tests/cpu-policy/test-cpu-policy.c;h=ca3b8dd45fe18fd809804e8ec2e1a7c8d098c3da;hb=refs/heads/staging
