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List: gcc-bugs
Subject: [Bug c++/107106] New: Incorrect use of uninitialized value warning
From: jlame646 at gmail dot com via Gcc-bugs <gcc-bugs () gcc ! gnu ! org>
Date: 2022-09-30 19:22:55
Message-ID: bug-107106-4 () http ! gcc ! gnu ! org/bugzilla/
[Download RAW message or body]
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107106
Bug ID: 107106
Summary: Incorrect use of uninitialized value warning
Product: gcc
Version: 12.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: jlame646 at gmail dot com
Target Milestone: ---
The following program with `-fanalyzer` flag produces incorrect warning. Demo:
https://godbolt.org/z/YWd4cKbGc
```
#include <string>
std::string square(int num) {
return std::to_string(num * num);
}
```
The warning says:
```
<source>: In function 'std::string square(int)':
<source>:4:36: warning: use of uninitialized value '<unknown>' [CWE-457]
[-Wanalyzer-use-of-uninitialized-value]
4 | return std::to_string(num * num);
| ^
'std::string square(int)': events 1-2
|
| 3 | std::string square(int num) {
| | ^
| | |
| | (1) region created on stack here
| 4 | return std::to_string(num * num);
| | ~
| | |
| | (2) use of uninitialized value
'<unknown>' here
|
<source>:4:36: warning: use of uninitialized value '<unknown>' [CWE-457]
[-Wanalyzer-use-of-uninitialized-value]
4 | return std::to_string(num * num);
| ^
'std::string square(int)': events 1-2
|
| 3 | std::string square(int num) {
| | ^
| | |
| | (1) region created on stack here
| 4 | return std::to_string(num * num);
| | ~
| | |
| | (2) use of uninitialized value
'<unknown>' here
|
```
On searching for possible dupes, i came across this:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=13025 that may be related to this
bug.=
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