Add a common wchar_overlay.h header.

Author: lntue

libc/hdr/CMakeLists.txt

@@ -161,10 +161,14 @@ add_proxy_header_library(
     libc.include.sys_auxv
 )
 
+add_header_library(wchar_overlay HDRS wchar_overlay.h)
+
 add_proxy_header_library(
   wchar_macros
   HDRS
     wchar_macros.h
+  DEPENDS
+    .wchar_overlay
   FULL_BUILD_DEPENDS
     libc.include.llvm-libc-macros.wchar_macros
     libc.include.wchar

libc/hdr/types/CMakeLists.txt

@@ -230,6 +230,8 @@ add_proxy_header_library(
   wchar_t
   HDRS
     wchar_t.h
+  DEPENDS
+    libc.hdr.wchar_overlay
   FULL_BUILD_DEPENDS
     libc.include.llvm-libc-types.wchar_t
     libc.include.wchar
@@ -239,6 +241,8 @@ add_proxy_header_library(
   wint_t
   HDRS
     wint_t.h
+  DEPENDS
+    libc.hdr.wchar_overlay
   FULL_BUILD_DEPENDS
     libc.include.llvm-libc-types.wint_t
     libc.include.wchar

libc/hdr/types/wchar_t.h

@@ -16,34 +16,7 @@
 
 #else // overlay mode
 
-// glibc <wchar.h header might provide extern inline definitions for few
-// functions, causing external alias errors.  They are guarded by
-// `__USE_EXTERN_INLINES` macro.  We temporarily disable `__USE_EXTERN_INLINES`
-// macro by defining `__NO_INLINE__` before including <wchar.h>.
-// And the same with `__USE_FORTIFY_LEVEL`, which will be temporarily disabled
-// with `_FORTIFY_SOURCE`.
-
-#ifdef _FORTIFY_SOURCE
-#define LIBC_OLD_FORTIFY_SOURCE _FORTIFY_SOURCE
-#undef _FORTIFY_SOURCE
-#endif
-
-#ifndef __NO_INLINE__
-#define __NO_INLINE__ 1
-#define LIBC_SET_NO_INLINE
-#endif
-
-#include <wchar.h>
-
-#ifdef LIBC_OLD_FORTIFY_SOURCE
-#define _FORTIFY_SOURCE LIBC_OLD_FORTIFY_SOURCE
-#undef LIBC_OLD_FORTIFY_SOURCE
-#endif
-
-#ifdef LIBC_SET_NO_INLINE
-#undef __NO_INLINE__
-#undef LIBC_SET_NO_INLINE
-#endif
+#include "hdr/wchar_overlay.h"
 
 #endif // LLVM_LIBC_FULL_BUILD
 

libc/hdr/types/wint_t.h

@@ -16,34 +16,7 @@
 
 #else // overlay mode
 
-// glibc <wchar.h header might provide extern inline definitions for few
-// functions, causing external alias errors.  They are guarded by
-// `__USE_EXTERN_INLINES` macro.  We temporarily disable `__USE_EXTERN_INLINES`
-// macro by defining `__NO_INLINE__` before including <wchar.h>.
-// And the same with `__USE_FORTIFY_LEVEL`, which will be temporarily disabled
-// with `_FORTIFY_SOURCE`.
-
-#ifdef _FORTIFY_SOURCE
-#define LIBC_OLD_FORTIFY_SOURCE _FORTIFY_SOURCE
-#undef _FORTIFY_SOURCE
-#endif
-
-#ifndef __NO_INLINE__
-#define __NO_INLINE__ 1
-#define LIBC_SET_NO_INLINE
-#endif
-
-#include <wchar.h>
-
-#ifdef LIBC_OLD_FORTIFY_SOURCE
-#define _FORTIFY_SOURCE LIBC_OLD_FORTIFY_SOURCE
-#undef LIBC_OLD_FORTIFY_SOURCE
-#endif
-
-#ifdef LIBC_SET_NO_INLINE
-#undef __NO_INLINE__
-#undef LIBC_SET_NO_INLINE
-#endif
+#include "hdr/wchar_overlay.h"
 
 #endif // LLVM_LIBC_FULL_BUILD
 

libc/hdr/wchar_macros.h

@@ -15,34 +15,7 @@
 
 #else // Overlay mode
 
-// glibc <wchar.h header might provide extern inline definitions for few
-// functions, causing external alias errors.  They are guarded by
-// `__USE_EXTERN_INLINES` macro.  We temporarily disable `__USE_EXTERN_INLINES`
-// macro by defining `__NO_INLINE__` before including <wchar.h>.
-// And the same with `__USE_FORTIFY_LEVEL`, which will be temporarily disabled
-// with `_FORTIFY_SOURCE`.
-
-#ifdef _FORTIFY_SOURCE
-#define LIBC_OLD_FORTIFY_SOURCE _FORTIFY_SOURCE
-#undef _FORTIFY_SOURCE
-#endif
-
-#ifndef __NO_INLINE__
-#define __NO_INLINE__ 1
-#define LIBC_SET_NO_INLINE
-#endif
-
-#include <wchar.h>
-
-#ifdef LIBC_OLD_FORTIFY_SOURCE
-#define _FORTIFY_SOURCE LIBC_OLD_FORTIFY_SOURCE
-#undef LIBC_OLD_FORTIFY_SOURCE
-#endif
-
-#ifdef LIBC_SET_NO_INLINE
-#undef __NO_INLINE__
-#undef LIBC_SET_NO_INLINE
-#endif
+#include "hdr/wchar_overlay.h"
 
 #endif // LLVM_LIBC_FULL_BUILD
 

libc/hdr/wchar_overlay.h

@@ -0,0 +1,47 @@
+//===-- Including wchar.h in overlay mode ---------------------------------===//
+//
+// 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_WCHAR_OVERLAY_H
+#define LLVM_LIBC_HDR_WCHAR_OVERLAY_H
+
+#ifdef LIBC_FULL_BUILD
+#error "This header should only be included in overlay mode"
+#endif
+
+// Overlay mode
+
+// glibc <wchar.h header might provide extern inline definitions for few
+// functions, causing external alias errors.  They are guarded by
+// `__USE_EXTERN_INLINES` macro.  We temporarily disable `__USE_EXTERN_INLINES`
+// macro by defining `__NO_INLINE__` before including <wchar.h>.
+// And the same with `__USE_FORTIFY_LEVEL`, which will be temporarily disabled
+// with `_FORTIFY_SOURCE`.
+
+#ifdef _FORTIFY_SOURCE
+#define LIBC_OLD_FORTIFY_SOURCE _FORTIFY_SOURCE
+#undef _FORTIFY_SOURCE
+#endif
+
+#ifndef __NO_INLINE__
+#define __NO_INLINE__ 1
+#define LIBC_SET_NO_INLINE
+#endif
+
+#include <wchar.h>
+
+#ifdef LIBC_OLD_FORTIFY_SOURCE
+#define _FORTIFY_SOURCE LIBC_OLD_FORTIFY_SOURCE
+#undef LIBC_OLD_FORTIFY_SOURCE
+#endif
+
+#ifdef LIBC_SET_NO_INLINE
+#undef __NO_INLINE__
+#undef LIBC_SET_NO_INLINE
+#endif
+
+#endif // LLVM_LIBC_HDR_WCHAR_OVERLAY_H