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[Headers][MSVC] Define wchar_t in stddef.h like MSVC if not using the builtin type 

MSVC expects wchar_t to be defined in stddef.h if /Zc:wchar_t- is specified

Reviewed By: efriedma

Differential Revision: https://reviews.llvm.org/D124026
This commit is contained in:
Stephen Long 2022-05-12 09:10:43 -07:00
parent 23191a4ffe
commit 7f9837cfa6
2 changed files with 7 additions and 1 deletions
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2
clang/lib/Headers/stddef.h
View File

@ -62,7 +62,7 @@ typedef __SIZE_TYPE__ rsize_t;
#endif /* defined(__need_STDDEF_H_misc) */
#if defined(__need_wchar_t)
#ifndef __cplusplus
#if !defined(__cplusplus) || (defined(_MSC_VER) && !_NATIVE_WCHAR_T_DEFINED)
/* Always define wchar_t when modules are available. */
#if !defined(_WCHAR_T) || __has_feature(modules)
#if !__has_feature(modules)

6
clang/test/Headers/ms-no-wchar.cpp Normal file
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@ -0,0 +1,6 @@
// RUN: %clang_cc1 -fsyntax-only -triple x86_64-pc-windows-msvc -fms-compatibility-version=17.00 -fno-wchar %s
// MSVC defines wchar_t instead of using the builtin if /Zc:wchar_t- is passed
#include <stddef.h>
wchar_t c;