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* [Bug libstdc++/110493] New: 'is not a constant expression' for function-local static std::initializer_list<std::string> with fsanitize=undefined
@ 2023-06-30 4:29 ed at catmur dot uk
2023-06-30 4:32 ` [Bug libstdc++/110493] " pinskia at gcc dot gnu.org
` (3 more replies)
0 siblings, 4 replies; 5+ messages in thread
From: ed at catmur dot uk @ 2023-06-30 4:29 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110493
Bug ID: 110493
Summary: 'is not a constant expression' for function-local
static std::initializer_list<std::string> with
fsanitize=undefined
Product: gcc
Version: 12.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: ed at catmur dot uk
Target Milestone: ---
Since 12.3.0, under -fsanitize=undefined -std=c++20:
#include <initializer_list>
#include <string>
void f() {
static auto a = {std::string()};
}
error: '(((const std::__cxx11::basic_string<char>*)(& <temporary>)) != 0)' is
not a constant expression
Clearly this is an instance of bug 71962, but this is in fairly unexceptional
code and could make ubsan unusable; it's not obvious that this code should have
anything to do with constant evaluation.
Since it only appears in a point release I would hope it might be possible to
fix in library for this specific case, within <initializer_list>?
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug libstdc++/110493] 'is not a constant expression' for function-local static std::initializer_list<std::string> with fsanitize=undefined
2023-06-30 4:29 [Bug libstdc++/110493] New: 'is not a constant expression' for function-local static std::initializer_list<std::string> with fsanitize=undefined ed at catmur dot uk
@ 2023-06-30 4:32 ` pinskia at gcc dot gnu.org
2023-06-30 4:42 ` pinskia at gcc dot gnu.org
` (2 subsequent siblings)
3 siblings, 0 replies; 5+ messages in thread
From: pinskia at gcc dot gnu.org @ 2023-06-30 4:32 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110493
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |DUPLICATE
Status|UNCONFIRMED |RESOLVED
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
std::string::string is a constexpr in C++20 ...
*** This bug has been marked as a duplicate of bug 71962 ***
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug libstdc++/110493] 'is not a constant expression' for function-local static std::initializer_list<std::string> with fsanitize=undefined
2023-06-30 4:29 [Bug libstdc++/110493] New: 'is not a constant expression' for function-local static std::initializer_list<std::string> with fsanitize=undefined ed at catmur dot uk
2023-06-30 4:32 ` [Bug libstdc++/110493] " pinskia at gcc dot gnu.org
@ 2023-06-30 4:42 ` pinskia at gcc dot gnu.org
2023-06-30 4:42 ` [Bug c++/110493] " pinskia at gcc dot gnu.org
2023-06-30 7:49 ` ed at catmur dot uk
3 siblings, 0 replies; 5+ messages in thread
From: pinskia at gcc dot gnu.org @ 2023-06-30 4:42 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110493
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|DUPLICATE |---
See Also| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=107079
Status|RESOLVED |UNCONFIRMED
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Actually let's reopen this ...
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug c++/110493] 'is not a constant expression' for function-local static std::initializer_list<std::string> with fsanitize=undefined
2023-06-30 4:29 [Bug libstdc++/110493] New: 'is not a constant expression' for function-local static std::initializer_list<std::string> with fsanitize=undefined ed at catmur dot uk
2023-06-30 4:32 ` [Bug libstdc++/110493] " pinskia at gcc dot gnu.org
2023-06-30 4:42 ` pinskia at gcc dot gnu.org
@ 2023-06-30 4:42 ` pinskia at gcc dot gnu.org
2023-06-30 7:49 ` ed at catmur dot uk
3 siblings, 0 replies; 5+ messages in thread
From: pinskia at gcc dot gnu.org @ 2023-06-30 4:42 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110493
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Component|libstdc++ |c++
--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Note it was not libstdc++ that changed but the front-end (PR 107079 ).
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug c++/110493] 'is not a constant expression' for function-local static std::initializer_list<std::string> with fsanitize=undefined
2023-06-30 4:29 [Bug libstdc++/110493] New: 'is not a constant expression' for function-local static std::initializer_list<std::string> with fsanitize=undefined ed at catmur dot uk
` (2 preceding siblings ...)
2023-06-30 4:42 ` [Bug c++/110493] " pinskia at gcc dot gnu.org
@ 2023-06-30 7:49 ` ed at catmur dot uk
3 siblings, 0 replies; 5+ messages in thread
From: ed at catmur dot uk @ 2023-06-30 7:49 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110493
--- Comment #4 from Ed Catmur <ed at catmur dot uk> ---
Ah, thanks. So a workaround is something like:
void f() { static auto a = {((bool*)&(int const&)0, std::string())}; }
That's not too bad, then.
^ permalink raw reply [flat|nested] 5+ messages in thread
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2023-06-30 4:29 [Bug libstdc++/110493] New: 'is not a constant expression' for function-local static std::initializer_list<std::string> with fsanitize=undefined ed at catmur dot uk
2023-06-30 4:32 ` [Bug libstdc++/110493] " pinskia at gcc dot gnu.org
2023-06-30 4:42 ` pinskia at gcc dot gnu.org
2023-06-30 4:42 ` [Bug c++/110493] " pinskia at gcc dot gnu.org
2023-06-30 7:49 ` ed at catmur dot uk
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