libc/hdr/stdio_overlay.h

   1 //===-- Including stdio.h in overlay mode ---------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #ifndef LLVM_LIBC_HDR_STDIO_OVERLAY_H
  10 #define LLVM_LIBC_HDR_STDIO_OVERLAY_H
  11
  12 #ifdef LIBC_FULL_BUILD
  13 #error "This header should only be included in overlay mode"
  14 #endif
  15
  16 // Overlay mode
  17
  18 // glibc <stdio.h> header might provide extern inline definitions for few
  19 // functions, causing external alias errors.  They are guarded by
  20 // `__USE_EXTERN_INLINES` macro.  We temporarily disable `__USE_EXTERN_INLINES`
  21 // macro by defining `__NO_INLINE__` before including <stdio.h>.
  22 // And the same with `__USE_FORTIFY_LEVEL`, which will be temporarily disabled
  23 // with `_FORTIFY_SOURCE`.
  24
  25 #ifdef _FORTIFY_SOURCE
  26 #define LIBC_OLD_FORTIFY_SOURCE _FORTIFY_SOURCE
  27 #undef _FORTIFY_SOURCE
  28 #endif
  29
  30 #ifdef __USE_EXTERN_INLINES
  31 #define LIBC_OLD_USE_EXTERN_INLINES
  32 #undef __USE_EXTERN_INLINES
  33 #endif
  34
  35 #ifdef __USE_FORTIFY_LEVEL
  36 #define LIBC_OLD_USE_FORTIFY_LEVEL __USE_FORTIFY_LEVEL
  37 #undef __USE_FORTIFY_LEVEL
  38 #define __USE_FORTIFY_LEVEL 0
  39 #endif
  40
  41 #ifndef __NO_INLINE__
  42 #define __NO_INLINE__ 1
  43 #define LIBC_SET_NO_INLINE
  44 #endif
  45
  46 #include <stdio.h>
  47
  48 #ifdef LIBC_OLD_FORTIFY_SOURCE
  49 #define _FORTIFY_SOURCE LIBC_OLD_FORTIFY_SOURCE
  50 #undef LIBC_OLD_FORTIFY_SOURCE
  51 #endif
  52
  53 #ifdef LIBC_SET_NO_INLINE
  54 #undef __NO_INLINE__
  55 #undef LIBC_SET_NO_INLINE
  56 #endif
  57
  58 #ifdef LIBC_OLD_USE_FORTIFY_LEVEL
  59 #undef __USE_FORTIFY_LEVEL
  60 #define __USE_FORTIFY_LEVEL LIBC_OLD_USE_FORTIFY_LEVEL
  61 #undef LIBC_OLD_USE_FORTIFY_LEVEL
  62 #endif
  63
  64 #ifdef LIBC_OLD_USE_EXTERN_INLINES
  65 #define __USE_EXTERN_INLINES
  66 #undef LIBC_OLD_USE_EXTERN_INLINES
  67 #endif
  68
  69 #endif // LLVM_LIBC_HDR_STDIO_OVERLAY_H