1 /* 2 * ALSA lib - dynamic symbol versions 3 * Copyright (c) 2002 by Jaroslav Kysela <perex@perex.cz> 4 * 5 * 6 * This library is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU Lesser General Public License as 8 * published by the Free Software Foundation; either version 2.1 of 9 * the License, or (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU Lesser General Public License for more details. 15 * 16 * You should have received a copy of the GNU Lesser General Public 17 * License along with this library; if not, write to the Free Software 18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 19 * 20 */ 21 22 #ifndef __ALSA_SYMBOLS_H 23 #define __ALSA_SYMBOLS_H 24 25 #if defined(PIC) && defined(VERSIONED_SYMBOLS) /* might be also configurable */ 26 #define USE_VERSIONED_SYMBOLS 27 #endif 28 29 #define INTERNAL_CONCAT2_2(Pre, Post) Pre##Post 30 #define INTERNAL(Name) INTERNAL_CONCAT2_2(__, Name) 31 32 #if HAVE_ATTRIBUTE_SYMVER && __GNUC__ > 10 33 #define symbol_version(real, name, version) \ 34 extern __typeof (real) real __attribute__((symver (#name "@" #version))) 35 #define default_symbol_version(real, name, version) \ 36 extern __typeof (real) real __attribute__((symver (#name "@@" #version))) 37 #else 38 #define symbol_version(real, name, version) \ 39 __asm__ (".symver " ASM_NAME(#real) "," ASM_NAME(#name) "@" #version) 40 #define default_symbol_version(real, name, version) \ 41 __asm__ (".symver " ASM_NAME(#real) "," ASM_NAME(#name) "@@" #version) 42 #endif 43 44 #ifdef __clang__ 45 #define EXPORT_SYMBOL __attribute__((visibility("default"))) 46 #else 47 #define EXPORT_SYMBOL __attribute__((visibility("default"),externally_visible)) 48 #endif 49 50 #ifdef USE_VERSIONED_SYMBOLS 51 #define use_symbol_version(real, name, version) \ 52 symbol_version(real, name, version) 53 #define use_default_symbol_version(real, name, version) \ 54 default_symbol_version(real, name, version) 55 #else 56 #define use_symbol_version(real, name, version) /* nothing */ 57 #if defined(__alpha__) || defined(__mips__) 58 #define use_default_symbol_version(real, name, version) \ 59 __asm__ (".weak " ASM_NAME(#name)); \ 60 __asm__ (ASM_NAME(#name) " = " ASM_NAME(#real)) 61 #else 62 #define use_default_symbol_version(real, name, version) \ 63 __asm__ (".weak " ASM_NAME(#name)); \ 64 __asm__ (".set " ASM_NAME(#name) "," ASM_NAME(#real)) 65 #endif 66 #endif 67 68 #endif /* __ALSA_SYMBOLS_H */ 69