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gnu-versions.h
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/* Header with interface version macros for library pieces copied elsewhere. Copyright (C) 1995-2018 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, see <http://www.gnu.org/licenses/>. */ #ifndef _GNU_VERSIONS_H #define _GNU_VERSIONS_H 1 /* This file exists to define these few macros. Each specifies a version number associated with the library interface of a piece of the C library which is also distributed with other GNU packages. These pieces are both part of the GNU C library and also distributed with other GNU packages so those packages may use their facilities on systems lacking the GNU C library. The source files for each piece surround all their code with `#ifndef ELIDE_CODE' after defining it with this: #define OBSTACK_INTERFACE_VERSION 1 #if !defined (_LIBC) && defined (__GNU_LIBRARY__) && __GNU_LIBRARY__ > 1 #include <gnu-versions.h> #if _GNU_OBSTACK_INTERFACE_VERSION == OBSTACK_INTERFACE_VERSION #define ELIDE_CODE #endif #endif This allows those one to avoid compiling those files when part of a GNU package not libc, on a system using a GNU C library that supports the same interface. Please preserve the format of the comments after each macro. And remember, if any of these versions change, the libc.so major version number must change too (so avoid it)! */ #define _GNU_OBSTACK_INTERFACE_VERSION 1 /* vs malloc/obstack.c */ #define _GNU_REGEX_INTERFACE_VERSION 1 /* vs posix/regex.c */ #define _GNU_GLOB_INTERFACE_VERSION 2 /* vs posix/glob.c */ #define _GNU_GETOPT_INTERFACE_VERSION 2 /* vs posix/getopt.c and posix/getopt1.c */ #endif /* gnu-versions.h */