zhjwpku opened a new issue, #46998:
URL: https://github.com/apache/arrow/issues/46998
### Describe the bug, including details regarding any error messages,
version, and platform.
On MacOS, I use the following command to configure arrow:
```
cmake ../cpp/ -DARROW_FILESYSTEM=ON -DARROW_PARQUET=ON
-DARROW_POSITION_INDEPENDENT_CODE=ON -DARROW_BUILD_SHARED=ON
-DARROW_WITH_ZLIB=ON -DZLIB_SOURCE=SYSTEM -DARROW_DEPENDENCY_SOURCE=BUNDLED
-DCMAKE_CXX_STANDARD=23
```
Compiler:
```
Apple clang version 17.0.0 (clang-1700.0.13.5)
Target: x86_64-apple-darwin24.3.0
Thread model: posix
InstalledDir: /Library/Developer/CommandLineTools/usr/bin
```
The compile fails on mockfs.cc with the following error:
```
/Library/Developer/CommandLineTools/SDKs/MacOSX15.5.sdk/usr/include/c++/v1/__memory/unique_ptr.h:79:19:
error: invalid application of 'sizeof' to an incomplete type
'arrow::fs::internal::(anonymous namespace)::Entry'
79 | static_assert(sizeof(_Tp) >= 0, "cannot delete an incomplete
type");
| ^~~~~~~~~~~
/Library/Developer/CommandLineTools/SDKs/MacOSX15.5.sdk/usr/include/c++/v1/__memory/unique_ptr.h:293:7:
note: in instantiation of member function
'std::default_delete<arrow::fs::internal::(anonymous
namespace)::Entry>::operator()' requested here
293 | __ptr_.second()(__tmp);
| ^
/Library/Developer/CommandLineTools/SDKs/MacOSX15.5.sdk/usr/include/c++/v1/__memory/unique_ptr.h:233:5:
note: in instantiation of member function
'std::unique_ptr<arrow::fs::internal::(anonymous namespace)::Entry>::reset'
requested here
233 | reset(__u.release());
| ^
/Users/zhjwpku/zhjwpku/arrow/cpp/src/arrow/filesystem/mockfs.cc:113:16:
note: in instantiation of member function
'std::unique_ptr<arrow::fs::internal::(anonymous namespace)::Entry>::operator='
requested here
113 | entries[s] = std::move(entry);
| ^
/Users/zhjwpku/zhjwpku/arrow/cpp/src/arrow/filesystem/mockfs.cc:57:7: note:
forward declaration of 'arrow::fs::internal::(anonymous namespace)::Entry'
57 | class Entry;
| ^
1 error generated.
```
### Component(s)
C++
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