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* [Bug middle-end/100571] New: bogus -Wstringop-overflow with VLA of elements larger than byte @ 2021-05-12 18:42 msebor at gcc dot gnu.org 2021-05-12 18:43 ` [Bug middle-end/100571] " msebor at gcc dot gnu.org ` (4 more replies) 0 siblings, 5 replies; 6+ messages in thread From: msebor at gcc dot gnu.org @ 2021-05-12 18:42 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100571 Bug ID: 100571 Summary: bogus -Wstringop-overflow with VLA of elements larger than byte Product: gcc Version: 10.3.1 Status: UNCONFIRMED Severity: normal Priority: P3 Component: middle-end Assignee: unassigned at gcc dot gnu.org Reporter: msebor at gcc dot gnu.org Target Milestone: --- This is probably a duplicate of an existing bug already fixed in GCC 11 but not in GCC 10. A recent enhancement to Glibc to add attribute access to a bunch of APIs has triggered a couple of false positives in the test suite, including: https://sourceware.org/pipermail/libc-alpha/2021-May/125987.html and https://sourceware.org/pipermail/libc-alpha/2021-May/126250.html A simple test case for the problem is as follows: $ cat t.c && gcc -O2 -S -Wall t.c __attribute__ ((access (read_only, 1, 2))) void f (int *, int); __SIZE_TYPE__ n; void g (void) { int a[n]; a[0] = 0; f (a, n); } t.t: In function 'g': t.c:9:3: warning: 'f' specified size 18446744073709551615 exceeds maximum object size 9223372036854775807 [-Wstringop-overflow=] 9 | f (a, n); | ^~~~~~~~ t.t:1:49: note: in a call to function 'f' declared with attribute 'read_only (1, 2)' 1 | __attribute__ ((access (read_only, 1, 2))) void f (int *, int); | ^ ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug middle-end/100571] bogus -Wstringop-overflow with VLA of elements larger than byte 2021-05-12 18:42 [Bug middle-end/100571] New: bogus -Wstringop-overflow with VLA of elements larger than byte msebor at gcc dot gnu.org @ 2021-05-12 18:43 ` msebor at gcc dot gnu.org 2021-05-12 18:45 ` msebor at gcc dot gnu.org ` (3 subsequent siblings) 4 siblings, 0 replies; 6+ messages in thread From: msebor at gcc dot gnu.org @ 2021-05-12 18:43 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100571 Martin Sebor <msebor at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Blocks| |88443 Ever confirmed|0 |1 Last reconfirmed| |2021-05-12 Known to fail| |10.1.0, 10.2.0, 10.3.0 Known to work| |11.1.0, 9.3.0 Assignee|unassigned at gcc dot gnu.org |msebor at gcc dot gnu.org Target Milestone|--- |10.4 Status|UNCONFIRMED |ASSIGNED Keywords| |diagnostic Referenced Bugs: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88443 [Bug 88443] [meta-bug] bogus/missing -Wstringop-overflow warnings ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug middle-end/100571] bogus -Wstringop-overflow with VLA of elements larger than byte 2021-05-12 18:42 [Bug middle-end/100571] New: bogus -Wstringop-overflow with VLA of elements larger than byte msebor at gcc dot gnu.org 2021-05-12 18:43 ` [Bug middle-end/100571] " msebor at gcc dot gnu.org @ 2021-05-12 18:45 ` msebor at gcc dot gnu.org 2021-05-12 21:49 ` cvs-commit at gcc dot gnu.org ` (2 subsequent siblings) 4 siblings, 0 replies; 6+ messages in thread From: msebor at gcc dot gnu.org @ 2021-05-12 18:45 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100571 Martin Sebor <msebor at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- URL| |https://sourceware.org/bugz | |illa/show_bug.cgi?id=27832 --- Comment #1 from Martin Sebor <msebor at gcc dot gnu.org> --- See also https://sourceware.org/bugzilla/show_bug.cgi?id=27832 ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug middle-end/100571] bogus -Wstringop-overflow with VLA of elements larger than byte 2021-05-12 18:42 [Bug middle-end/100571] New: bogus -Wstringop-overflow with VLA of elements larger than byte msebor at gcc dot gnu.org 2021-05-12 18:43 ` [Bug middle-end/100571] " msebor at gcc dot gnu.org 2021-05-12 18:45 ` msebor at gcc dot gnu.org @ 2021-05-12 21:49 ` cvs-commit at gcc dot gnu.org 2021-05-12 21:51 ` msebor at gcc dot gnu.org 2021-05-12 21:59 ` cvs-commit at gcc dot gnu.org 4 siblings, 0 replies; 6+ messages in thread From: cvs-commit at gcc dot gnu.org @ 2021-05-12 21:49 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100571 --- Comment #2 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The releases/gcc-10 branch has been updated by Martin Sebor <msebor@gcc.gnu.org>: https://gcc.gnu.org/g:0d1e4025b2bd2ce36d6ee2a5d836d31ec8a12999 commit r10-9819-g0d1e4025b2bd2ce36d6ee2a5d836d31ec8a12999 Author: Martin Sebor <msebor@redhat.com> Date: Wed May 12 15:45:44 2021 -0600 PR middle-end/100571 - bogus -Wstringop-overflow with VLA of elements larger than byte gcc/ChangeLog: PR middle-end/100571 * calls.c (maybe_warn_rdwr_sizes): Clear object size if it can't be determined. gcc/testsuite/ChangeLog: PR middle-end/100571 * gcc.dg/Wstringop-overflow-67.c: New test. ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug middle-end/100571] bogus -Wstringop-overflow with VLA of elements larger than byte 2021-05-12 18:42 [Bug middle-end/100571] New: bogus -Wstringop-overflow with VLA of elements larger than byte msebor at gcc dot gnu.org ` (2 preceding siblings ...) 2021-05-12 21:49 ` cvs-commit at gcc dot gnu.org @ 2021-05-12 21:51 ` msebor at gcc dot gnu.org 2021-05-12 21:59 ` cvs-commit at gcc dot gnu.org 4 siblings, 0 replies; 6+ messages in thread From: msebor at gcc dot gnu.org @ 2021-05-12 21:51 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100571 Martin Sebor <msebor at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|ASSIGNED |RESOLVED Resolution|--- |FIXED --- Comment #3 from Martin Sebor <msebor at gcc dot gnu.org> --- Fixed in r10-9819. ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug middle-end/100571] bogus -Wstringop-overflow with VLA of elements larger than byte 2021-05-12 18:42 [Bug middle-end/100571] New: bogus -Wstringop-overflow with VLA of elements larger than byte msebor at gcc dot gnu.org ` (3 preceding siblings ...) 2021-05-12 21:51 ` msebor at gcc dot gnu.org @ 2021-05-12 21:59 ` cvs-commit at gcc dot gnu.org 4 siblings, 0 replies; 6+ messages in thread From: cvs-commit at gcc dot gnu.org @ 2021-05-12 21:59 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100571 --- Comment #4 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Martin Sebor <msebor@gcc.gnu.org>: https://gcc.gnu.org/g:db514f98a383b2ebdcfe74feb80f98f406cec174 commit r12-756-gdb514f98a383b2ebdcfe74feb80f98f406cec174 Author: Martin Sebor <msebor@redhat.com> Date: Wed May 12 15:57:34 2021 -0600 Add test for PR middle-end/100571. gcc/testsuite: PR middle-end/100571 * gcc.dg/Wstringop-overflow-67.c: New test. ^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2021-05-12 21:59 UTC | newest] Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2021-05-12 18:42 [Bug middle-end/100571] New: bogus -Wstringop-overflow with VLA of elements larger than byte msebor at gcc dot gnu.org 2021-05-12 18:43 ` [Bug middle-end/100571] " msebor at gcc dot gnu.org 2021-05-12 18:45 ` msebor at gcc dot gnu.org 2021-05-12 21:49 ` cvs-commit at gcc dot gnu.org 2021-05-12 21:51 ` msebor at gcc dot gnu.org 2021-05-12 21:59 ` cvs-commit at gcc dot gnu.org
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