[libc++] fix largefile handling in fs::copy_file

[Jannik2099]

fix for #109211

[llvmbot]

@llvm/pr-subscribers-libcxx

Author: Jannik Glückert (Jannik2099)

Changes

fix for #109211

---

Full diff: https://github.com/llvm/llvm-project/pull/121855.diff

1 Files Affected:

• (modified) libcxx/src/filesystem/operations.cpp (+6)

diff --git a/libcxx/src/filesystem/operations.cpp b/libcxx/src/filesystem/operations.cpp
index bd37c5af86f6c3..208a55723d8838 100644
--- a/libcxx/src/filesystem/operations.cpp
+++ b/libcxx/src/filesystem/operations.cpp
@@ -238,8 +238,14 @@ bool copy_file_impl_copy_file_range(FileDescriptor& read_fd, FileDescriptor& wri
     return false;
   }
   // do not modify the fd positions as copy_file_impl_sendfile may be called after a partial copy
+#  if defined(__linux__)
+  loff_t off_in  = 0;
+  loff_t off_out = 0;
+#  else
   off_t off_in  = 0;
   off_t off_out = 0;
+#  endif
+
   do {
     ssize_t res;
 

[vitalybuka]

Thanks, this fixed our build.

[thesamesam]

The change is correct, but to add context in case anybody wonders in future: see https://inbox.sourceware.org/libc-alpha/[email protected]/ onwards.