https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85650
Bug ID: 85650
Summary: Additional warnings when -fsanitize=undefined is used
with -Wstringop-truncation
Product: gcc
Version: 8.1.0
Status: UNCONFIRMED
Keywords: diagnostic
Severity: normal
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
Reporter: sirl at gcc dot gnu.org
Target Milestone: ---
Created attachment 44067
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44067&action=edit
testcase 1
These 2 testcases show additional warnings when -fsanitize=undefined is added
to the commandline.
$ LANG=C gcc-8 -c -O2 -fsanitize=undefined -Wstringop-truncation t8.c
t8.c: In function 'ay':
t8.c:13:3: warning: 'strncpy' output may be truncated copying between 0 and
7998 bytes from a string of length 7999 [-Wstringop-truncation]
strncpy(c, a, b);
^~~~~~~~~~~~~~~~
$ LANG=C gcc-8 -c -O2 -fsanitize=undefined -Wstringop-truncation t9.c
t9.c: In function 'd':
t9.c:15:3: warning: 'strncpy' output may be truncated copying between 0 and
4094 bytes from a string of length 4094 [-Wstringop-truncation]
strncpy(st, a.ah.a, len);
^~~~~~~~~~~~~~~~~~~~~~~~
Current trunk@r259927 shows the same behaviour.
