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* [Bug c/103145] New: False positive of -Wstringop-overread on gcc-11 @ 2021-11-09 2:56 tonyfettes at tonyfettes dot com 2021-11-09 19:38 ` [Bug tree-optimization/103145] " msebor at gcc dot gnu.org ` (5 more replies) 0 siblings, 6 replies; 7+ messages in thread From: tonyfettes at tonyfettes dot com @ 2021-11-09 2:56 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103145 Bug ID: 103145 Summary: False positive of -Wstringop-overread on gcc-11 Product: gcc Version: 11.1.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c Assignee: unassigned at gcc dot gnu.org Reporter: tonyfettes at tonyfettes dot com Target Milestone: --- Hi, The following piece of code will trigger -Wstringop-overread $ cat test.c // test.c #include <stdio.h> #define ARRAY_SIZE 4 struct func_in_t { int x; int y; }; struct example_t { int field0; int field1; int field2; int field3; int field4; }; struct example_t func(const struct func_in_t *in, const int array[ARRAY_SIZE]) { struct example_t out = {0}; return out; } int main() { int array[ARRAY_SIZE] = { 0, 0, 0, 0 }; struct func_in_t in = { .x = 0, .y = 0, }; struct example_t col = func(&in, array); (void) col; return 0; } $ gcc -fno-strict-aliasing -fwrapv -Wall test.c -o test test.c: In function ‘main’: test.c:30:26: warning: ‘func’ reading 16 bytes from a region of size 8 [-Wstringop-overread] 30 | struct example_t col = func(&in, array); | ^~~~~~~~~~~~~~~~ test.c:30:26: note: referencing argument 2 of type ‘const int *’ test.c:19:18: note: in a call to function ‘func’ 19 | struct example_t func(const struct func_in_t *in, const int array[ARRAY_SIZE]) { | ^~~~ $ gcc -v Using built-in specs. COLLECT_GCC=gcc COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-pc-linux-gnu/11.1.0/lto-wrapper Target: x86_64-pc-linux-gnu Configured with: /build/gcc/src/gcc/configure --prefix=/usr --libdir=/usr/lib --libexecdir=/usr/lib --mandir=/usr/share/man --infodir=/usr/share/info --with-bugurl=https://bugs.archlinux.org/ --enable-languages=c,c++,ada,fortran,go,lto,objc,obj-c++,d --with-isl --with-linker-hash-style=gnu --with-system-zlib --enable-__cxa_atexit --enable-cet=auto --enable-checking=release --enable-clocale=gnu --enable-default-pie --enable-default-ssp --enable-gnu-indirect-function --enable-gnu-unique-object --enable-install-libiberty --enable-linker-build-id --enable-lto --enable-multilib --enable-plugin --enable-shared --enable-threads=posix --disable-libssp --disable-libstdcxx-pch --disable-libunwind-exceptions --disable-werror gdc_include_dir=/usr/include/dlang/gdc Thread model: posix Supported LTO compression algorithms: zlib zstd gcc version 11.1.0 (GCC) It seems like a duplication of https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101854, but I'm not sure about it since gcc gave different diagnostics (one is overread, the other is overflow), so I decide to submit it anyway. ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug tree-optimization/103145] False positive of -Wstringop-overread on gcc-11 2021-11-09 2:56 [Bug c/103145] New: False positive of -Wstringop-overread on gcc-11 tonyfettes at tonyfettes dot com @ 2021-11-09 19:38 ` msebor at gcc dot gnu.org 2021-11-09 19:40 ` [Bug tree-optimization/103145] [11 Regression] bogus -Wstringop-overread with an array argument msebor at gcc dot gnu.org ` (4 subsequent siblings) 5 siblings, 0 replies; 7+ messages in thread From: msebor at gcc dot gnu.org @ 2021-11-09 19:38 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103145 Martin Sebor <msebor at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Known to work| |10.3.0, 12.0 Blocks| |97048 Status|UNCONFIRMED |NEW Last reconfirmed| |2021-11-09 Known to fail| |11.2.0 Ever confirmed|0 |1 --- Comment #1 from Martin Sebor <msebor at gcc dot gnu.org> --- Confirmed with GCC 11. It's fixed on trunk but at the moment I'm having trouble finding the commit that fixed to see if it's suitable for backporting. Referenced Bugs: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97048 [Bug 97048] [meta-bug] bogus/missing -Wstringop-overread warnings ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug tree-optimization/103145] [11 Regression] bogus -Wstringop-overread with an array argument 2021-11-09 2:56 [Bug c/103145] New: False positive of -Wstringop-overread on gcc-11 tonyfettes at tonyfettes dot com 2021-11-09 19:38 ` [Bug tree-optimization/103145] " msebor at gcc dot gnu.org @ 2021-11-09 19:40 ` msebor at gcc dot gnu.org 2021-11-16 13:09 ` rguenth at gcc dot gnu.org ` (3 subsequent siblings) 5 siblings, 0 replies; 7+ messages in thread From: msebor at gcc dot gnu.org @ 2021-11-09 19:40 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103145 Martin Sebor <msebor at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Summary|False positive of |[11 Regression] bogus |-Wstringop-overread on |-Wstringop-overread with an |gcc-11 |array argument See Also| |https://gcc.gnu.org/bugzill | |a/show_bug.cgi?id=102810 --- Comment #2 from Martin Sebor <msebor at gcc dot gnu.org> --- See also pr102810 for a similar looking problem (not yet fixed). ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug tree-optimization/103145] [11 Regression] bogus -Wstringop-overread with an array argument 2021-11-09 2:56 [Bug c/103145] New: False positive of -Wstringop-overread on gcc-11 tonyfettes at tonyfettes dot com 2021-11-09 19:38 ` [Bug tree-optimization/103145] " msebor at gcc dot gnu.org 2021-11-09 19:40 ` [Bug tree-optimization/103145] [11 Regression] bogus -Wstringop-overread with an array argument msebor at gcc dot gnu.org @ 2021-11-16 13:09 ` rguenth at gcc dot gnu.org 2021-11-18 15:45 ` redi at gcc dot gnu.org ` (2 subsequent siblings) 5 siblings, 0 replies; 7+ messages in thread From: rguenth at gcc dot gnu.org @ 2021-11-16 13:09 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103145 Richard Biener <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Keywords| |needs-bisection Priority|P3 |P2 Target Milestone|--- |11.3 ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug tree-optimization/103145] [11 Regression] bogus -Wstringop-overread with an array argument 2021-11-09 2:56 [Bug c/103145] New: False positive of -Wstringop-overread on gcc-11 tonyfettes at tonyfettes dot com ` (2 preceding siblings ...) 2021-11-16 13:09 ` rguenth at gcc dot gnu.org @ 2021-11-18 15:45 ` redi at gcc dot gnu.org 2022-04-21 7:50 ` rguenth at gcc dot gnu.org 2023-05-29 10:06 ` jakub at gcc dot gnu.org 5 siblings, 0 replies; 7+ messages in thread From: redi at gcc dot gnu.org @ 2021-11-18 15:45 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103145 Jonathan Wakely <redi at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Keywords|needs-bisection | --- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> --- The warning started with r11-3305 and went away with r12-2976 ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug tree-optimization/103145] [11 Regression] bogus -Wstringop-overread with an array argument 2021-11-09 2:56 [Bug c/103145] New: False positive of -Wstringop-overread on gcc-11 tonyfettes at tonyfettes dot com ` (3 preceding siblings ...) 2021-11-18 15:45 ` redi at gcc dot gnu.org @ 2022-04-21 7:50 ` rguenth at gcc dot gnu.org 2023-05-29 10:06 ` jakub at gcc dot gnu.org 5 siblings, 0 replies; 7+ messages in thread From: rguenth at gcc dot gnu.org @ 2022-04-21 7:50 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103145 Richard Biener <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Target Milestone|11.3 |11.4 --- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> --- GCC 11.3 is being released, retargeting bugs to GCC 11.4. ^ permalink raw reply [flat|nested] 7+ messages in thread
* [Bug tree-optimization/103145] [11 Regression] bogus -Wstringop-overread with an array argument 2021-11-09 2:56 [Bug c/103145] New: False positive of -Wstringop-overread on gcc-11 tonyfettes at tonyfettes dot com ` (4 preceding siblings ...) 2022-04-21 7:50 ` rguenth at gcc dot gnu.org @ 2023-05-29 10:06 ` jakub at gcc dot gnu.org 5 siblings, 0 replies; 7+ messages in thread From: jakub at gcc dot gnu.org @ 2023-05-29 10:06 UTC (permalink / raw) To: gcc-bugs https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103145 Jakub Jelinek <jakub at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Target Milestone|11.4 |11.5 --- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> --- GCC 11.4 is being released, retargeting bugs to GCC 11.5. ^ permalink raw reply [flat|nested] 7+ messages in thread
end of thread, other threads:[~2023-05-29 10:06 UTC | newest] Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2021-11-09 2:56 [Bug c/103145] New: False positive of -Wstringop-overread on gcc-11 tonyfettes at tonyfettes dot com 2021-11-09 19:38 ` [Bug tree-optimization/103145] " msebor at gcc dot gnu.org 2021-11-09 19:40 ` [Bug tree-optimization/103145] [11 Regression] bogus -Wstringop-overread with an array argument msebor at gcc dot gnu.org 2021-11-16 13:09 ` rguenth at gcc dot gnu.org 2021-11-18 15:45 ` redi at gcc dot gnu.org 2022-04-21 7:50 ` rguenth at gcc dot gnu.org 2023-05-29 10:06 ` jakub at gcc dot gnu.org
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