[llvm] Fix C++23 build error in llvm/Support/Caching.h (PR #163545)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-llvm-support

Author: Victor Vianna (victorvianna)

<details>
<summary>Changes</summary>

[1] instantiates ~std::unique_ptr<MemoryBuffer>, so it must be a complete type.

[1] https://github.com/llvm/llvm-project/blob/4b89704504dde687ba7983e034cb246581fd1407/llvm/include/llvm/Support/Caching.h#L121

---
Full diff: https://github.com/llvm/llvm-project/pull/163545.diff


1 Files Affected:

- (modified) llvm/include/llvm/Support/Caching.h (+1-2) 


``````````diff
diff --git a/llvm/include/llvm/Support/Caching.h b/llvm/include/llvm/Support/Caching.h
index 7fd9befbef9db..cebf071b0188f 100644
--- a/llvm/include/llvm/Support/Caching.h
+++ b/llvm/include/llvm/Support/Caching.h
@@ -17,11 +17,10 @@
 
 #include "llvm/Support/Compiler.h"
 #include "llvm/Support/Error.h"
+#include "llvm/Support/MemoryBuffer.h"
 
 namespace llvm {
 
-class MemoryBuffer;
-
 /// This class wraps an output stream for a file. Most clients should just be
 /// able to return an instance of this base class from the stream callback, but
 /// if a client needs to perform some action after the stream is written to,

``````````

</details>


https://github.com/llvm/llvm-project/pull/163545