[libcxx-commits] [libcxx] [libc++] Support file offsets larger than 2GB in basic_filebuf on 32-bit AIX and 32-bit glibc Linux (PR #215892)

[Nikolas Klauser via libcxx-commits]

================
@@ -217,6 +217,14 @@ typedef basic_fstream<wchar_t> wfstream;
 #      pragma GCC system_header
 #    endif
 
+#    if defined(_AIX)
+// On AIX, fopen64/fseeko64/ftello64 are not guaranteed to always be declared, so we declare them
+// here. They are not POSIX-reserved names, so we use __asm__ to guard them against a user #define.
----------------
philnik777 wrote:

```suggestion
// here. We use `__asm__` to avoid colliding with the declaration in the header in any way.
```
I don't think we care too much about the non-reseved name here, but we _really_ want to avoid inflicting pain on the libc because we're doing funky stuff.

https://github.com/llvm/llvm-project/pull/215892