[Bug middle-end/92014] [10 Regression] bogus warning: writing 8 bytes into a region of size 1 in timezone/zic.c

[msebor at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92014

--- Comment #2 from Martin Sebor <msebor at gcc dot gnu.org> ---
Author: msebor
Date: Tue Oct  8 19:48:27 2019
New Revision: 276711

URL: https://gcc.gnu.org/viewcvs?rev=276711&root=gcc&view=rev
Log:
PR middle-end/92026 - gcc.dg/Wstringop-overflow-18.c FAIL
PR middle-end/92014 - bogus warning: writing 8 bytes into a region of size 1 in
timezone/zic.c

gcc/ChangeLog:
        * tree-ssa-strlen.c (count_nonzero_bytes): Avoid recursing for MEM_REF
        again once nbytes has been set.  Set the access size when not yet set.

gcc/testsuite/ChangeLog:

        PR middle-end/92014
        * gcc.dg/Wstringop-overflow-19.c: New test.

Added:
    trunk/gcc/testsuite/gcc.dg/Wstringop-overflow-19.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/tree-ssa-strlen.c