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From: Mike Frysinger <vapier@gentoo.org> some architectures, like Blackfin, have a prefix added to all symbols (in our case it's historical baggage) while normally packages shouldnt care, when code starts mixing assembler with C (like symbol versioning), you need to dip down into the inner details. find attached a patch which queries gcc for the prefix (all gcc toolchains have a builtin define of __USER_LABEL_PREFIX__) and then automatically has asm() constructs utilize this since most targets define __USER_LABEL_PREFIX__ to nothing, hopefully this shouldnt cause any problems :)
72 lines
2.7 KiB
C
72 lines
2.7 KiB
C
/*
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* ALSA lib - dynamic symbol versions
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* Copyright (c) 2002 by Jaroslav Kysela <perex@suse.cz>
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*
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*
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* This library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as
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* published by the Free Software Foundation; either version 2.1 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#ifndef __ALSA_SYMBOLS_H
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#define __ALSA_SYMBOLS_H
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#if defined(PIC) && defined(VERSIONED_SYMBOLS) /* might be also configurable */
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#define USE_VERSIONED_SYMBOLS
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#endif
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#define INTERNAL_CONCAT2_2(Pre, Post) Pre##Post
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#define INTERNAL(Name) INTERNAL_CONCAT2_2(__, Name)
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#ifdef __powerpc64__
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# define symbol_version(real, name, version) \
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__asm__ (".symver " ASM_NAME(#real) "," ASM_NAME(#name) "@" #version); \
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__asm__ (".symver ." ASM_NAME(#real) ",." ASM_NAME(#name) "@" #version)
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# define default_symbol_version(real, name, version) \
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__asm__ (".symver " ASM_NAME(#real) "," ASM_NAME(#name) "@@" #version); \
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__asm__ (".symver ." ASM_NAME(#real) ",." ASM_NAME(#name) "@@" #version)
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#else
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# define symbol_version(real, name, version) \
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__asm__ (".symver " ASM_NAME(#real) "," ASM_NAME(#name) "@" #version)
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# define default_symbol_version(real, name, version) \
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__asm__ (".symver " ASM_NAME(#real) "," ASM_NAME(#name) "@@" #version)
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#endif
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#ifdef USE_VERSIONED_SYMBOLS
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#define use_symbol_version(real, name, version) \
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symbol_version(real, name, version)
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#define use_default_symbol_version(real, name, version) \
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default_symbol_version(real, name, version)
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#else
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#define use_symbol_version(real, name, version) /* nothing */
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#ifdef __powerpc64__
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#define use_default_symbol_version(real, name, version) \
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__asm__ (".weak " ASM_NAME(#name)); \
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__asm__ (".weak ." ASM_NAME(#name)); \
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__asm__ (".set " ASM_NAME(#name) "," ASM_NAME(#real)); \
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__asm__ (".set ." ASM_NAME(#name) ",." ASM_NAME(#real))
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#else
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#if defined(__alpha__) || defined(__mips__)
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#define use_default_symbol_version(real, name, version) \
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__asm__ (".weak " ASM_NAME(#name)); \
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__asm__ (ASM_NAME(#name) " = " ASM_NAME(#real))
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#else
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#define use_default_symbol_version(real, name, version) \
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__asm__ (".weak " ASM_NAME(#name)); \
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__asm__ (".set " ASM_NAME(#name) "," ASM_NAME(#real))
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#endif
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#endif
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#endif
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#endif /* __ALSA_SYMBOLS_H */
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