1// Licensed to the .NET Foundation under one or more agreements.
2// The .NET Foundation licenses this file to you under the MIT license.
3// See the LICENSE file in the project root for more information.
4
5/*++
6
7
8
9Module Name:
10
11 pal_char16.h
12
13Abstract:
14
15This file is used to define the wchar_t type as a 16-bit type on Unix.
16
17
18
19--*/
20
21// The unix compilers use a 32-bit wchar_t, so we must make a 16 bit wchar_t.
22// The windows compilers, gcc and MSVC, both define a 16 bit wchar_t.
23
24// Note : wchar_t is a built-in type in C++, gcc/llvm ignores any attempts to
25// typedef it. Using the preprocessor here, we make sure gcc sees
26// __wchar_16_cpp__ instead of wchar_t. This is apparently not necessary under
27// vc++, for whom wchar_t is already a typedef instead of a built-in.
28
29#ifndef PAL_STDCPP_COMPAT
30#undef wchar_t
31#undef __WCHAR_TYPE__
32#define __WCHAR_TYPE__ __wchar_16_cpp__
33#define wchar_t __wchar_16_cpp__
34
35// Set up the wchar_t type (which got preprocessed to __wchar_16_cpp__).
36// In C++11, the standard gives us char16_t, which is what we want (and matches types with u"")
37// In C, this doesn't exist, so use unsigned short.
38// **** WARNING: Linking C and C++ objects will break with -fstrict-aliasing with GCC/Clang
39// due to conditional typedef
40#if !defined(_WCHAR_T_DEFINED) || !defined(_MSC_VER)
41#if defined(__cplusplus)
42#undef __WCHAR_TYPE__
43#define __WCHAR_TYPE__ char16_t
44typedef char16_t wchar_t;
45#else
46#undef __WCHAR_TYPE__
47#define __WCHAR_TYPE__ unsigned short
48typedef unsigned short wchar_t;
49#endif // __cplusplus
50
51#ifndef _WCHAR_T_DEFINED
52#define _WCHAR_T_DEFINED
53#endif // !_WCHAR_T_DEFINED
54#endif // !_WCHAR_T_DEFINED || !_MSC_VER
55#endif // !PAL_STDCPP_COMPAT
56