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* [Bug c++/57566] New: [C++11][constexpr] static temporaries bound recursively in reference constant expressions don't get initialized
@ 2013-06-08 0:26 richard-gccbugzilla at metafoo dot co.uk
2021-08-09 19:30 ` [Bug c++/57566] [C++11] " pinskia at gcc dot gnu.org
0 siblings, 1 reply; 2+ messages in thread
From: richard-gccbugzilla at metafoo dot co.uk @ 2013-06-08 0:26 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57566
Bug ID: 57566
Summary: [C++11][constexpr] static temporaries bound
recursively in reference constant expressions don't
get initialized
Product: gcc
Version: 4.9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: richard-gccbugzilla at metafoo dot co.uk
If a temporary is lifetime-extended by being bound to a reference within a
lifetime-extended temporary, and the complete initializer is a constant
expression, the outer temporary does not get initialized and the inner
temporary does not get emitted. Example:
struct S { int &&a; int b; };
S &&s = { 123, 456 };
GCC emits:
.local _ZGR1s0
.comm _ZGR1s0,16,16
.globl s
.bss
.align 8
.type s, @object
.size s, 8
s:
.zero 8
GCC emits code to dynamically initialize 's.a' to the address of _ZGR1s0. GCC
does not emit any code to initialize _ZGR1s0 itself, nor to initialize s.b.
Both s and the temporaries should be emitted as constants.
^ permalink raw reply [flat|nested] 2+ messages in thread
* [Bug c++/57566] [C++11] static temporaries bound recursively in reference constant expressions don't get initialized
2013-06-08 0:26 [Bug c++/57566] New: [C++11][constexpr] static temporaries bound recursively in reference constant expressions don't get initialized richard-gccbugzilla at metafoo dot co.uk
@ 2021-08-09 19:30 ` pinskia at gcc dot gnu.org
0 siblings, 0 replies; 2+ messages in thread
From: pinskia at gcc dot gnu.org @ 2021-08-09 19:30 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=57566
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |5.0
Status|UNCONFIRMED |RESOLVED
Resolution|--- |FIXED
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Fixed in GCC 5+.
Maybe by r5-5022.
^ permalink raw reply [flat|nested] 2+ messages in thread
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2013-06-08 0:26 [Bug c++/57566] New: [C++11][constexpr] static temporaries bound recursively in reference constant expressions don't get initialized richard-gccbugzilla at metafoo dot co.uk
2021-08-09 19:30 ` [Bug c++/57566] [C++11] " pinskia at gcc dot gnu.org
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