https://github.com/bassiounix updated 
https://github.com/llvm/llvm-project/pull/163238

>From 02bef79b92f2f091ee2241a9eb6fd91abb406f94 Mon Sep 17 00:00:00 2001
From: bassiounix <[email protected]>
Date: Mon, 13 Oct 2025 21:14:40 +0300
Subject: [PATCH] [libc][annex_k] Add rsize_t.

---
 libc/hdr/types/CMakeLists.txt               |  8 +++++++
 libc/hdr/types/rsize_t.h                    | 23 +++++++++++++++++++++
 libc/include/llvm-libc-types/CMakeLists.txt |  1 +
 libc/include/llvm-libc-types/rsize_t.h      | 18 ++++++++++++++++
 4 files changed, 50 insertions(+)
 create mode 100644 libc/hdr/types/rsize_t.h
 create mode 100644 libc/include/llvm-libc-types/rsize_t.h

diff --git a/libc/hdr/types/CMakeLists.txt b/libc/hdr/types/CMakeLists.txt
index 8ec2926ee16fc..6fe26881f737e 100644
--- a/libc/hdr/types/CMakeLists.txt
+++ b/libc/hdr/types/CMakeLists.txt
@@ -135,6 +135,14 @@ add_proxy_header_library(
     libc.include.llvm-libc-types.struct_tm
 )
 
+add_proxy_header_library(
+  rsize_t
+  HDRS
+    rsize_t.h
+  FULL_BUILD_DEPENDS
+    libc.include.llvm-libc-types.rsize_t
+)
+
 add_proxy_header_library(
   size_t
   HDRS
diff --git a/libc/hdr/types/rsize_t.h b/libc/hdr/types/rsize_t.h
new file mode 100644
index 0000000000000..130e6c308e264
--- /dev/null
+++ b/libc/hdr/types/rsize_t.h
@@ -0,0 +1,23 @@
+//===-- Proxy for rsize_t 
-------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM 
Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_LIBC_HDR_TYPES_SIZE_T_H
+#define LLVM_LIBC_HDR_TYPES_SIZE_T_H
+
+#ifdef LIBC_FULL_BUILD
+
+#include "include/llvm-libc-types/rsize_t.h"
+
+#else
+
+#define __need_rsize_t
+#include <stddef.h>
+#undef __need_rsize_t
+
+#endif // LIBC_FULL_BUILD
+
+#endif // LLVM_LIBC_HDR_TYPES_SIZE_T_H
diff --git a/libc/include/llvm-libc-types/CMakeLists.txt 
b/libc/include/llvm-libc-types/CMakeLists.txt
index e8b3ae8c08a90..cc7b2847909e4 100644
--- a/libc/include/llvm-libc-types/CMakeLists.txt
+++ b/libc/include/llvm-libc-types/CMakeLists.txt
@@ -1,4 +1,5 @@
 add_header(off64_t HDR off64_t.h)
+add_header(rsize_t HDR rsize_t.h)
 add_header(size_t HDR size_t.h)
 add_header(ssize_t HDR ssize_t.h)
 add_header(__atfork_callback_t HDR __atfork_callback_t.h)
diff --git a/libc/include/llvm-libc-types/rsize_t.h 
b/libc/include/llvm-libc-types/rsize_t.h
new file mode 100644
index 0000000000000..dc8be02bee592
--- /dev/null
+++ b/libc/include/llvm-libc-types/rsize_t.h
@@ -0,0 +1,18 @@
+//===-- Definition of size_t types 
----------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM 
Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_TYPES_RSIZE_T_H
+#define LLVM_LIBC_TYPES_RSIZE_T_H
+
+#ifdef LIBC_HAS_ANNEX_K
+
+typedef __SIZE_TYPE__ rsize_t;
+
+#endif // LIBC_HAS_ANNEX_K
+
+#endif // LLVM_LIBC_TYPES_RSIZE_T_H

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