/*
* Copyright © 2015 Guillem Jover <guillem@hadrons.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
* THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef LIBBSD_LOCAL_LINK_H
#define LIBBSD_LOCAL_LINK_H
#include <sys/cdefs.h>
#ifdef __ELF__
#define libbsd_link_warning(symbol, msg) \
static const char libbsd_emit_link_warning_##symbol[] \
__attribute__((__used__,__section__(".gnu.warning." #symbol))) = msg
#else
#define libbsd_link_warning(symbol, msg)
#endif
#if defined(__APPLE__)
#define libbsd_strong_alias(symbol, alias) \
__asm__(".globl _" #alias); \
__asm__(".set _" #alias ", _" #symbol); \
extern __typeof(symbol) alias
#elif !defined(_MSC_VER)
#define libbsd_strong_alias(symbol, alias) \
extern __typeof__(symbol) alias __attribute__((__alias__(#symbol)))
#endif
#if defined(__ELF__) && !defined(__sun)
# if __has_attribute(symver)
/* The symver attribute is supported since gcc 10.x. */
#define libbsd_symver_default(symbol, alias, version) \
extern __typeof__(symbol) symbol \
__attribute__((__symver__(#alias "@@" #version)))
#define libbsd_symver_variant(symbol, alias, version) \
extern __typeof__(symbol) symbol \
__attribute__((__symver__(#alias "@" #version)))
#define libbsd_symver_weak(symbol, alias, version) \
extern __typeof__(symbol) symbol \
__attribute__((__symver__(#alias "@" #version), __weak__))
# else
#define libbsd_symver_default(symbol, alias, version) \
__asm__(".symver " #symbol "," #alias "@@" #version)
#define libbsd_symver_variant(symbol, alias, version) \
__asm__(".symver " #symbol "," #alias "@" #version)
#define libbsd_symver_weak(symbol, alias, version) \
libbsd_symver_variant(symbol, alias, version); \
extern __typeof__(symbol) alias \
__attribute__((__weak__))
# endif
#else
#define libbsd_symver_default(symbol, alias, version) \
libbsd_strong_alias(symbol, alias)
#define libbsd_symver_variant(symbol, alias, version)
#define libbsd_symver_weak(symbol, alias, version)
#endif
#endif
