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silence GCC's -Wuninitialized in utility.h #563

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@virt00l virt00l commented Feb 21, 2025

to silence string's swap warning (perhaps only when it's part of pair?) It obviously fails compilation with -Werror (treat warnings as errors)

Full error looks like:

In file included from .../EASTL/internal/function_detail.h:22,
from .../EASTL/internal/function.h:14,
from .../EASTL/functional.h:1359,
...
In function ‘void eastl::swap(T&, T&) [with T = eastl::basic_string<char, eastl::allocator>::RawLayout]’,
inlined from ‘void eastl::basic_string<T, A>::Layout::Move(eastl::basic_string<T, A>::Layout&, eastl::basic_string<T, A>::Layout&) [with T = char; Allocator = eastl::allocator]’ at .../EASTL/string.h:486:78,
inlined from ‘eastl::basic_string<T, A>::Layout::Layout(eastl::basic_string<T, A>::Layout&&) [with T = char; Allocator = eastl::allocator]’ at .../EASTL/string.h:399:68,
inlined from ‘void eastl::swap(T&, T&) [with T = eastl::basic_string<char, eastl::allocator>::Layout]’ at .../EASTL/utility.h:56:5,
inlined from ‘eastl::basic_string<T, Allocator>& eastl::basic_string<T, A>::assign(eastl::basic_string<T, A>::this_type&&) [with T = char; Allocator = eastl::allocator]’ at .../EASTL/string.h:1979:15,
inlined from ‘eastl::basic_string<T, A>::this_type& eastl::basic_string<T, A>::operator=(eastl::basic_string<T, A>::this_type&&) [with T = char; Allocator = eastl::allocator]’ at .../EASTL/string.h:1304:16,
inlined from ‘eastl::pair<T1, T2>& eastl::pair<T1, T2>::operator=(eastl::pair<T1, T2>&&) [with T1 = unsigned int; T2 = eastl::basic_string<char, eastl::allocator>]’ at .../EASTL/utility.h:542:28,
inlined from ‘void eastl::swap(T&, T&) [with T = eastl::pair<unsigned int, eastl::basic_string<char, eastl::allocator> >]’ at .../EASTL/utility.h:57:5:
.../EASTL/utility.h:56:19: error: ‘temp.eastl::basic_string<char, eastl::allocator>::Layout::.eastl::basic_string<char, eastl::allocator>::Layout::._anon_111::raw’ is used uninitialized [-Werror=uninitialized]
56 | T temp(EASTL_MOVE(a)); // EASTL_MOVE uses EASTL::move when available, else is a no-op.
| ^~~~
.../EASTL/utility.h: In function ‘void eastl::swap(T&, T&) [with T = eastl::pair<unsigned int, eastl::basic_string<char, eastl::allocator> >]’:
.../EASTL/utility.h:56:19: note: ‘temp’ declared here
56 | T temp(EASTL_MOVE(a)); // EASTL_MOVE uses EASTL::move when available, else is a no-op.
| ^~~~

Repro-ed at least on GCC version 11.2.1 & 12.2.1

to silence string's swap warning (perhaps only when it's part of pair?)
It obviously fails compilation with -Werror (treat warnings as errors)

Full error looks like:

In file included from .../EASTL/internal/function_detail.h:22,
                 from .../EASTL/internal/function.h:14,
                 from .../EASTL/functional.h:1359,
                 ...
In function ‘void eastl::swap(T&, T&) [with T = eastl::basic_string<char, eastl::allocator>::RawLayout]’,
    inlined from ‘void eastl::basic_string<T, A>::Layout::Move(eastl::basic_string<T, A>::Layout&, eastl::basic_string<T, A>::Layout&) [with T = char; Allocator = eastl::allocator]’ at .../EASTL/string.h:486:78,
    inlined from ‘eastl::basic_string<T, A>::Layout::Layout(eastl::basic_string<T, A>::Layout&&) [with T = char; Allocator = eastl::allocator]’ at .../EASTL/string.h:399:68,
    inlined from ‘void eastl::swap(T&, T&) [with T = eastl::basic_string<char, eastl::allocator>::Layout]’ at .../EASTL/utility.h:56:5,
    inlined from ‘eastl::basic_string<T, Allocator>& eastl::basic_string<T, A>::assign(eastl::basic_string<T, A>::this_type&&) [with T = char; Allocator = eastl::allocator]’ at .../EASTL/string.h:1979:15,
    inlined from ‘eastl::basic_string<T, A>::this_type& eastl::basic_string<T, A>::operator=(eastl::basic_string<T, A>::this_type&&) [with T = char; Allocator = eastl::allocator]’ at .../EASTL/string.h:1304:16,
    inlined from ‘eastl::pair<T1, T2>& eastl::pair<T1, T2>::operator=(eastl::pair<T1, T2>&&) [with T1 = unsigned int; T2 = eastl::basic_string<char, eastl::allocator>]’ at .../EASTL/utility.h:542:28,
    inlined from ‘void eastl::swap(T&, T&) [with T = eastl::pair<unsigned int, eastl::basic_string<char, eastl::allocator> >]’ at .../EASTL/utility.h:57:5:
.../EASTL/utility.h:56:19: error: ‘temp.eastl::basic_string<char, eastl::allocator>::Layout::<unnamed>.eastl::basic_string<char, eastl::allocator>::Layout::._anon_111::raw’ is used uninitialized [-Werror=uninitialized]
   56 |                 T temp(EASTL_MOVE(a));  // EASTL_MOVE uses EASTL::move when available, else is a no-op.
      |                   ^~~~
.../EASTL/utility.h: In function ‘void eastl::swap(T&, T&) [with T = eastl::pair<unsigned int, eastl::basic_string<char, eastl::allocator> >]’:
.../EASTL/utility.h:56:19: note: ‘temp’ declared here
   56 |                 T temp(EASTL_MOVE(a));  // EASTL_MOVE uses EASTL::move when available, else is a no-op.
      |                   ^~~~

Repro-ed at least on GCC version 11.2.1 & 12.2.1
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