path: root/include/libc-symbols.h

/* Support macros for making weak and strong aliases for symbols,
   and for using symbol sets and linker warnings with GNU ld.
   Copyright (C) 1995-2017 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 _LIBC_SYMBOLS_H
#define _LIBC_SYMBOLS_H	1

/* This file is included implicitly in the compilation of every source file,
   using -include.  It includes config.h.  */

/* Enable declarations of GNU extensions, since we are compiling them.  */
#define _GNU_SOURCE 1

#ifdef MODULE_NAME

/* Use `#if IS_IN (module)` to detect what component is being compiled.  */
#define PASTE_NAME1(a,b) a##b
#define PASTE_NAME(a,b)	 PASTE_NAME1 (a,b)
#define IN_MODULE	 PASTE_NAME (MODULE_, MODULE_NAME)
#define IS_IN(lib)	 (IN_MODULE == MODULE_##lib)

/* True if the current module is a versioned library.  Versioned
   library names culled from shlib-versions files are assigned a
   MODULE_* value greater than MODULE_LIBS_BEGIN.  */
#define IS_IN_LIB	 (IN_MODULE > MODULE_LIBS_BEGIN)

/* The testsuite, and some other ancillary code, should be compiled against
   as close an approximation to the installed headers as possible.
   Defining this symbol disables most internal-use-only declarations
   provided by this header, and all those provided by other internal
   wrapper headers.  */
#if IS_IN (testsuite) || defined IS_IN_build || defined __cplusplus
# define _ISOMAC 1
#endif

#else
/* The generation process for a few files created very early in the
   build (notably libc-modules.h itself) involves preprocessing this
   header without defining MODULE_NAME.  Under these conditions,
   internal declarations (especially from config.h) must be visible,
   but IS_IN should always evaluate as false.  */
# define IS_IN(lib) 0
# define IS_IN_LIB 0
# define IN_MODULE (-1)
#endif

#ifndef _ISOMAC

/* This is defined for the compilation of all C library code.  features.h
   tests this to avoid inclusion of stubs.h wh