https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108391
Bug ID: 108391
Summary: Operator '::operator delete(void*, size_t)' was not
found when clang compiled stdlibc++
Product: gcc
Version: 12.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: jincikang at gmail dot com
Target Milestone: ---
```C++
// main.cpp
#include <new>
int main() {
void* p = ::operator new[](2);
::operator delete[](p, 2);
}
```
# no problem
$ g++ main.cpp -std=c++20
# no problem
$ clang++ main.cpp -std=c++20 -stdlib=libc++
$ clang++ main.cpp -std=c++20
main.cpp:5:3: error: no matching function for call to 'operator delete[]'
::operator delete[](p, 2);
^~~~~~~~~~~~~~~~~~~
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/12.2.0/../../../../include/c++/12.2.0/new:146:6:
note: candidate function not viable: no known conversion from 'int' to 'const
std::nothrow_t' for 2nd argument
void operator delete[](void*, const std::nothrow_t&) _GLIBCXX_USE_NOEXCEPT
^
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/12.2.0/../../../../include/c++/12.2.0/new:161:6:
note: candidate function not viable: no known conversion from 'int' to
'std::align_val_t' for 2nd argument
void operator delete[](void*, std::align_val_t)
^
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/12.2.0/../../../../include/c++/12.2.0/new:181:13:
note: candidate function not viable: no known conversion from 'int' to 'void *'
for 2nd argument
inline void operator delete[](void*, void*) _GLIBCXX_USE_NOEXCEPT { }
^
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/12.2.0/../../../../include/c++/12.2.0/new:132:6:
note: candidate function not viable: requires 1 argument, but 2 were provided
void operator delete[](void*) _GLIBCXX_USE_NOEXCEPT
^
/usr/bin/../lib64/gcc/x86_64-pc-linux-gnu/12.2.0/../../../../include/c++/12.2.0/new:163:6:
note: candidate function not viable: requires 3 arguments, but 2 were provided
void operator delete[](void*, std::align_val_t, const std::nothrow_t&)
^
1 error generated
* The reason is that clang does not define the macro __cpp_sized_deallocation.
* I think `#ifndef _LIBCPP_HAS_NO_LIBRARY_SIZED_DEALLOCATION` in libc++ might
be a bit better
