================
@@ -166,8 +167,15 @@ ContentCache::getBufferOrNone(DiagnosticsEngine &Diag,
FileManager &FM,
// Unless this is a named pipe (in which case we can handle a mismatch),
// check that the file's size is the same as in the file entry (which may
// have come from a stat cache).
+#ifndef __MVS__
if (!ContentsEntry->isNamedPipe() &&
Buffer->getBufferSize() != (size_t)ContentsEntry->getSize()) {
+#else
+ // The buffer will always be larger than the file size on z/OS in the
presence
+ // of characters outside the base character set.
+ if (!ContentsEntry->isNamedPipe() &&
+ Buffer->getBufferSize() < (size_t)ContentsEntry->getSize()) {
----------------
perry-ca wrote:
To remove the #if we could just replace the != with < and then add an assert:
```cpp
assert(Buffer->getBufferSize() <= (size_t)ContentsEntry->getSize());
f (!ContentsEntry->isNamedPipe() &&
Buffer->getBufferSize() < (size_t)ContentsEntry->getSize()) {
```
https://github.com/llvm/llvm-project/pull/98652
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