https://github.com/AaronBallman created
https://github.com/llvm/llvm-project/pull/154767
Reverts llvm/llvm-project#154599
It seems to be causing staging failures:
https://lab.llvm.org/staging/#/builders/192/builds/1329
https://lab.llvm.org/staging/#/builders/192/builds/1330
>From d72ad36f407f28cf8b3f23f3a8bdb835eb7b8776 Mon Sep 17 00:00:00 2001
From: Aaron Ballman <aa...@aaronballman.com>
Date: Thu, 21 Aug 2025 10:01:23 -0400
Subject: [PATCH] Revert "[C++] Expose nullptr_t from stddef.h in C++ mode
(#154599)"
This reverts commit 7d167f45643b37a627e2aef49f718a5a2debd5d3.
---
clang/docs/ReleaseNotes.rst | 1 -
clang/lib/Headers/__stddef_nullptr_t.h | 3 +--
clang/test/Headers/stddefneeds.cpp | 26 +-------------------------
3 files changed, 2 insertions(+), 28 deletions(-)
diff --git a/clang/docs/ReleaseNotes.rst b/clang/docs/ReleaseNotes.rst
index c32102d102cd3..fe1dd15c6f885 100644
--- a/clang/docs/ReleaseNotes.rst
+++ b/clang/docs/ReleaseNotes.rst
@@ -229,7 +229,6 @@ Bug Fixes in This Version
cast chain. (#GH149967).
- Fixed a crash with incompatible pointer to integer conversions in designated
initializers involving string literals. (#GH154046)
-- Clang's ``<stddef.h>`` now properly declares ``nullptr_t`` in C++ mode.
(#GH154577).
Bug Fixes to Compiler Builtins
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
diff --git a/clang/lib/Headers/__stddef_nullptr_t.h
b/clang/lib/Headers/__stddef_nullptr_t.h
index c84b7bc2dc198..7f3fbe6fe0d3a 100644
--- a/clang/lib/Headers/__stddef_nullptr_t.h
+++ b/clang/lib/Headers/__stddef_nullptr_t.h
@@ -16,8 +16,7 @@
#define _NULLPTR_T
#ifdef __cplusplus
-#if __cplusplus >= 201103L ||
\
- (defined(_MSC_EXTENSIONS) && defined(_NATIVE_NULLPTR_SUPPORTED))
+#if defined(_MSC_EXTENSIONS) && defined(_NATIVE_NULLPTR_SUPPORTED)
namespace std {
typedef decltype(nullptr) nullptr_t;
}
diff --git a/clang/test/Headers/stddefneeds.cpp
b/clang/test/Headers/stddefneeds.cpp
index 6e8829bc1be67..0282e8afa600d 100644
--- a/clang/test/Headers/stddefneeds.cpp
+++ b/clang/test/Headers/stddefneeds.cpp
@@ -1,12 +1,10 @@
// RUN: %clang_cc1 -fsyntax-only -triple x86_64-apple-macosx10.9.0 -verify
-Wsentinel -std=c++11 %s
-// RUN: %clang_cc1 -fsyntax-only -triple x86_64-apple-macosx10.9.0
-verify=old,expected -Wsentinel -std=c++98 %s
ptrdiff_t p0; // expected-error{{unknown}}
size_t s0; // expected-error{{unknown}}
void* v0 = NULL; // expected-error{{undeclared}}
wint_t w0; // expected-error{{unknown}}
max_align_t m0; // expected-error{{unknown}}
-nullptr_t n0; // expected-error {{unknown}}
#define __need_ptrdiff_t
#include <stddef.h>
@@ -16,7 +14,6 @@ size_t s1; // expected-error{{unknown}}
void* v1 = NULL; // expected-error{{undeclared}}
wint_t w1; // expected-error{{unknown}}
max_align_t m1; // expected-error{{unknown}}
-nullptr_t n1; // expected-error{{unknown}}
#define __need_size_t
#include <stddef.h>
@@ -26,16 +23,6 @@ size_t s2;
void* v2 = NULL; // expected-error{{undeclared}}
wint_t w2; // expected-error{{unknown}}
max_align_t m2; // expected-error{{unknown}}
-nullptr_t n2; // expected-error{{unknown}}
-
-#define __need_nullptr_t
-#include <stddef.h>
-ptrdiff_t p6;
-size_t s6;
-void* v6 = NULL; // expected-error{{undeclared}}
-wint_t w6; // expected-error{{unknown}}
-max_align_t m6; // expected-error{{unknown}}
-nullptr_t n6; // old-error{{unknown}}
#define __need_NULL
#include <stddef.h>
@@ -45,16 +32,6 @@ size_t s3;
void* v3 = NULL;
wint_t w3; // expected-error{{unknown}}
max_align_t m3; // expected-error{{unknown}}
-nullptr_t n3; // old-error{{unknown}}
-
-#define __need_max_align_t
-#include <stddef.h>
-ptrdiff_t p7;
-size_t s7;
-void* v7 = NULL;
-wint_t w7; // expected-error{{unknown}}
-max_align_t m7;
-nullptr_t n7; // old-error{{unknown}}
// Shouldn't bring in wint_t by default:
#include <stddef.h>
@@ -64,7 +41,6 @@ size_t s4;
void* v4 = NULL;
wint_t w4; // expected-error{{unknown}}
max_align_t m4;
-nullptr_t n4; // old-error{{unknown}}
#define __need_wint_t
#include <stddef.h>
@@ -74,7 +50,7 @@ size_t s5;
void* v5 = NULL;
wint_t w5;
max_align_t m5;
-nullptr_t n5; // old-error{{unknown}}
+
// linux/stddef.h does something like this for cpp files:
#undef NULL
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