gnu-versions.h

   1 /* Header with interface version macros for library pieces copied elsewhere.
   2 Copyright (C) 1995 Free Software Foundation, Inc.
   3 This file is part of the GNU C Library.
   4
   5 The GNU C Library is free software; you can redistribute it and/or
   6 modify it under the terms of the GNU Library General Public License as
   7 published by the Free Software Foundation; either version 2 of the
   8 License, or (at your option) any later version.
   9
  10 The GNU C Library is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13 Library General Public License for more details.
  14
  15 You should have received a copy of the GNU Library General Public
  16 License along with the GNU C Library; see the file COPYING.LIB.  If
  17 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  18 Cambridge, MA 02139, USA.  */
  19
  20 #ifndef _GNU_VERSIONS_H
  21 #define _GNU_VERSIONS_H 1
  22
  23 /* This file exists to define these few macros.  Each specifies a version
  24    number associated with the library interface of a piece of the C library
  25    which is also distributed with other GNU packages.  These pieces are
  26    both part of the GNU C library and also distributed with other GNU
  27    packages so those packages may use their facilities on systems lacking
  28    the GNU C library.  The source files for each piece surround all their
  29    code with `#ifndef ELIDE_CODE' after defining it with this:
  30
  31    #define OBSTACK_INTERFACE_VERSION 1
  32    #if !defined (_LIBC) && defined (__GNU_LIBRARY__) && __GNU_LIBRARY__ > 1
  33    #include <gnu-versions.h>
  34    #if _GNU_OBSTACK_INTERFACE_VERSION == OBSTACK_INTERFACE_VERSION
  35    #define ELIDE_CODE
  36    #endif
  37    #endif
  38
  39    This allows those one to avoid compiling those files when part of a GNU
  40    package not libc, on a system using a GNU C library that supports the
  41    same interface.
  42
  43    Please preserve the format of the comments after each macro.  And
  44    remember, if any of these versions change, the libc.so major version
  45    number must change too (so avoid it)!  */
  46
  47 #define _GNU_OBSTACK_INTERFACE_VERSION  1 /* vs malloc/obstack.c */
  48 #define _GNU_REGEX_INTERFACE_VERSION    1 /* vs posix/regex.c */
  49
  50 #endif  /* gnu-versions.h */