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* [Bug c++/107106] New: Incorrect use of uninitialized value warning
@ 2022-09-30 19:22 jlame646 at gmail dot com
2022-09-30 23:48 ` [Bug analyzer/107106] " dmalcolm at gcc dot gnu.org
2023-02-19 20:23 ` [Bug analyzer/107106] Incorrect use of uninitialized value warning on C++ jg at jguk dot org
0 siblings, 2 replies; 3+ messages in thread
From: jlame646 at gmail dot com @ 2022-09-30 19:22 UTC (permalink / raw)
To: gcc-bugs
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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2022-09-30 19:22 [Bug c++/107106] New: Incorrect use of uninitialized value warning jlame646 at gmail dot com
2022-09-30 23:48 ` [Bug analyzer/107106] " dmalcolm at gcc dot gnu.org
2023-02-19 20:23 ` [Bug analyzer/107106] Incorrect use of uninitialized value warning on C++ jg at jguk dot org
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