[libcxx-commits] [libcxx] [libc++] use copy_file_range for fs::copy (PR #109211)

[Yi Kong via libcxx-commits]

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In-Reply-To: <llvm.org/llvm/llvm-project/pull/109211 at github.com>


kongy wrote:

`copy_file_range` was introduced in glibc 2.27. This change breaks environments with older glibc than that.

```
libcxx/src/filesystem/operations.cpp:246:18: error: no member named 'copy_file_range' in the global namespace
  246 |     if ((res = ::copy_file_range(read_fd.fd, &off_in, write_fd.fd, &off_out, count, 0)) == -1) {
      |                ~~^
1 error generated.
```

https://github.com/llvm/llvm-project/pull/109211