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* [Bug gdb/29715] New: gdbsupport/default-init-alloc.h fails to compile as C++20, std::allocator::construct() removed
@ 2022-10-21 18:29 andrew at ishiboo dot com
2024-01-06 12:41 ` [Bug gdb/29715] " ssbssa at sourceware dot org
0 siblings, 1 reply; 2+ messages in thread
From: andrew at ishiboo dot com @ 2022-10-21 18:29 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=29715
Bug ID: 29715
Summary: gdbsupport/default-init-alloc.h fails to compile as
C++20, std::allocator::construct() removed
Product: gdb
Version: HEAD
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: gdb
Assignee: unassigned at sourceware dot org
Reporter: andrew at ishiboo dot com
Target Milestone: ---
When attempting to build GDB with `-std=c++20`, `default-init-alloc.h` fails to
compile:
../../gdbsupport/../gdbsupport/default-init-alloc.h: In instantiation of 'class
gdb::default_init_allocator<unsigned char, std::allocator<unsigned char> >':
/usr/include/c++/10/bits/stl_vector.h:87:21: required from 'struct
std::_Vector_base<unsigned char, gdb::default_init_allocator<unsigned char,
std::allocator<unsigned char> > >'
/usr/include/c++/10/bits/stl_vector.h:389:11: required from 'class
std::vector<unsigned char, gdb::default_init_allocator<unsigned char,
std::allocator<unsigned char> > >'
../../gdbsupport/common-utils.cc:439:25: required from here
../../gdbsupport/../gdbsupport/default-init-alloc.h:52:12: error: 'construct'
has not been declared in 'std::allocator<unsigned char>'
52 | using A::construct;
| ^~~~~~~~~
This is because `std::allocator::construct()` was deprecated in C++17 and
removed in C++20. There does not appear to be a more fine-grain feature test
for this, so this class will need to be modified to use the existing code when
<= C++17 and a new implementation using `construct_at()` when >= C++20.
https://en.cppreference.com/w/cpp/memory/allocator/construct
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* [Bug gdb/29715] gdbsupport/default-init-alloc.h fails to compile as C++20, std::allocator::construct() removed
2022-10-21 18:29 [Bug gdb/29715] New: gdbsupport/default-init-alloc.h fails to compile as C++20, std::allocator::construct() removed andrew at ishiboo dot com
@ 2024-01-06 12:41 ` ssbssa at sourceware dot org
0 siblings, 0 replies; 2+ messages in thread
From: ssbssa at sourceware dot org @ 2024-01-06 12:41 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=29715
Hannes Domani <ssbssa at sourceware dot org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |14.1
CC| |ssbssa at sourceware dot org
Status|UNCONFIRMED |RESOLVED
Resolution|--- |FIXED
--- Comment #1 from Hannes Domani <ssbssa at sourceware dot org> ---
Was fixed by this commit:
https://sourceware.org/git/?p=binutils-gdb.git;a=commitdiff;h=6feae66da1d652a50c1759bae46128087f7dfab0
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2022-10-21 18:29 [Bug gdb/29715] New: gdbsupport/default-init-alloc.h fails to compile as C++20, std::allocator::construct() removed andrew at ishiboo dot com
2024-01-06 12:41 ` [Bug gdb/29715] " ssbssa at sourceware dot org
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