[libc-commits] [libc] [libc] Update size_t and ssize_t definitions to use __SIZE_TYPE__ and __PTRDIFF_TYPE__ respectively. (PR #143921)

[via libc-commits]

https://github.com/lntue created https://github.com/llvm/llvm-project/pull/143921

None

>From ff636fd261a718d389ce0180e984b133af01bbe8 Mon Sep 17 00:00:00 2001
From: Tue Ly <lntue.h at gmail.com>
Date: Thu, 12 Jun 2025 15:58:04 +0000
Subject: [PATCH] [libc] Update size_t and ssize_t definitions to use
 __SIZE_TYPE__ and __PTRDIFF_TYPE__ respectively.

---
 libc/include/llvm-libc-types/size_t.h  | 7 +------
 libc/include/llvm-libc-types/ssize_t.h | 2 +-
 2 files changed, 2 insertions(+), 7 deletions(-)

diff --git a/libc/include/llvm-libc-types/size_t.h b/libc/include/llvm-libc-types/size_t.h
index 3b31b0820f237..26ae68abe0ee7 100644
--- a/libc/include/llvm-libc-types/size_t.h
+++ b/libc/include/llvm-libc-types/size_t.h
@@ -9,11 +9,6 @@
 #ifndef LLVM_LIBC_TYPES_SIZE_T_H
 #define LLVM_LIBC_TYPES_SIZE_T_H
 
-// Since __need_size_t is defined, we get the definition of size_t from the
-// standalone C header stddef.h. Also, because __need_size_t is defined,
-// including stddef.h will pull only the type size_t and nothing else.
-#define __need_size_t
-#include <stddef.h>
-#undef __need_size_t
+typedef __SIZE_TYPE__ size_t;
 
 #endif // LLVM_LIBC_TYPES_SIZE_T_H
diff --git a/libc/include/llvm-libc-types/ssize_t.h b/libc/include/llvm-libc-types/ssize_t.h
index 41e4b6d2c500a..8f579e2749bac 100644
--- a/libc/include/llvm-libc-types/ssize_t.h
+++ b/libc/include/llvm-libc-types/ssize_t.h
@@ -9,6 +9,6 @@
 #ifndef LLVM_LIBC_TYPES_SSIZE_T_H
 #define LLVM_LIBC_TYPES_SSIZE_T_H
 
-typedef __INT64_TYPE__ ssize_t;
+typedef __PTRDIFF_TYPE__ ssize_t;
 
 #endif // LLVM_LIBC_TYPES_SSIZE_T_H