https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86345
Bug ID: 86345
Summary: Likely false warning with -Wstringop-overflow and
memset
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Keywords: diagnostic
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: sirl at gcc dot gnu.org
Target Milestone: ---
Created attachment 44335
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44335&action=edit
testcase
The attached testcase warns like this with trunk@262215:
gcc-trunk -c -O2 -Wstringop-overflow test-stringop-overflow.c
test-stringop-overflow.c: In function 'func2':
test-stringop-overflow.c:56:3: warning: 'memset' specified size between
18446744071562067968 and 18446744073709551615 exceeds maximum object size
9223372036854775807 [-Wstringop-overflow=]
memset ((buf), 0, (len));
^~~~~~~~~~~~~~~~~~~~~~~~
This is a relatively new regression on trunk (gcc-8-branch is fine). The code
is quite sensitive to changes, so I didn't reduce it further.
