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e0976d7e90
We had several cases of code needing a strong alias, so we switch those to use the new macro. This covers systems that support the alias attribute and others such as macOS where we need to use assembler directives to add the alias as the attribute is not supported.
85 lines
3.2 KiB
C
85 lines
3.2 KiB
C
/*
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* Copyright © 2015 Guillem Jover <guillem@hadrons.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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* THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef LIBBSD_LOCAL_LINK_H
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#define LIBBSD_LOCAL_LINK_H
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#include <sys/cdefs.h>
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#ifdef __ELF__
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#define libbsd_link_warning(symbol, msg) \
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static const char libbsd_emit_link_warning_##symbol[] \
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__attribute__((__used__,__section__(".gnu.warning." #symbol))) = msg
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#else
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#define libbsd_link_warning(symbol, msg)
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#endif
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#if defined(__APPLE__)
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#define libbsd_strong_alias(alias, symbol) \
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__asm__(".globl _" #alias); \
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__asm__(".set _" #alias ", _" #symbol); \
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extern __typeof(symbol) alias
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#elif !defined(_MSC_VER)
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#define libbsd_strong_alias(alias, symbol) \
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extern __typeof__(symbol) alias __attribute__((__alias__(#symbol)))
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#endif
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#ifdef __ELF__
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# if __has_attribute(symver)
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/* The symver attribute is supported since gcc 10.x. */
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#define libbsd_symver_default(alias, symbol, version) \
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extern __typeof__(symbol) symbol \
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__attribute__((__symver__(#alias "@@" #version)))
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#define libbsd_symver_variant(alias, symbol, version) \
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extern __typeof__(symbol) symbol \
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__attribute__((__symver__(#alias "@" #version)))
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#define libbsd_symver_weak(alias, symbol, version) \
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extern __typeof__(symbol) symbol \
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__attribute__((__symver__(#alias "@" #version), __weak__))
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# else
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#define libbsd_symver_default(alias, symbol, version) \
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__asm__(".symver " #symbol "," #alias "@@" #version)
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#define libbsd_symver_variant(alias, symbol, version) \
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__asm__(".symver " #symbol "," #alias "@" #version)
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#define libbsd_symver_weak(alias, symbol, version) \
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libbsd_symver_variant(alias, symbol, version); \
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extern __typeof__(symbol) alias \
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__attribute__((__weak__))
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# endif
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#else
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#define libbsd_symver_default(alias, symbol, version) \
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libbsd_strong_alias(alias, symbol)
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#define libbsd_symver_variant(alias, symbol, version)
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#define libbsd_symver_weak(alias, symbol, version)
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#endif
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#endif
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