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add support for hosts that have custom symbol prefixes

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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 :)
This commit is contained in:
Takashi Iwai 2006-09-19 18:07:51 +02:00
parent 0211bc3b68
commit f0fbd4c03e
3 changed files with 33 additions and 19 deletions
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28
include/alsa-symbols.h
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@ -31,16 +31,16 @@
#ifdef __powerpc64__
# define symbol_version(real, name, version) \
__asm__ (".symver " #real "," #name "@" #version); \
__asm__ (".symver ." #real ",." #name "@" #version)
__asm__ (".symver " ASM_NAME(#real) "," ASM_NAME(#name) "@" #version); \
__asm__ (".symver ." ASM_NAME(#real) ",." ASM_NAME(#name) "@" #version)
# define default_symbol_version(real, name, version) \
__asm__ (".symver " #real "," #name "@@" #version); \
__asm__ (".symver ." #real ",." #name "@@" #version)
__asm__ (".symver " ASM_NAME(#real) "," ASM_NAME(#name) "@@" #version); \
__asm__ (".symver ." ASM_NAME(#real) ",." ASM_NAME(#name) "@@" #version)
#else
# define symbol_version(real, name, version) \
__asm__ (".symver " #real "," #name "@" #version)
__asm__ (".symver " ASM_NAME(#real) "," ASM_NAME(#name) "@" #version)
# define default_symbol_version(real, name, version) \
__asm__ (".symver " #real "," #name "@@" #version)
__asm__ (".symver " ASM_NAME(#real) "," ASM_NAME(#name) "@@" #version)
#endif
#ifdef USE_VERSIONED_SYMBOLS
@ -52,19 +52,19 @@
#define use_symbol_version(real, name, version) /* nothing */
#ifdef __powerpc64__
#define use_default_symbol_version(real, name, version) \
__asm__ (".weak " #name); \
__asm__ (".weak ." #name); \
__asm__ (".set " #name "," #real); \
__asm__ (".set ." #name ",." #real)
__asm__ (".weak " ASM_NAME(#name)); \
__asm__ (".weak ." ASM_NAME(#name)); \
__asm__ (".set " ASM_NAME(#name) "," ASM_NAME(#real)); \
__asm__ (".set ." ASM_NAME(#name) ",." ASM_NAME(#real))
#else
#if defined(__alpha__) || defined(__mips__)
#define use_default_symbol_version(real, name, version) \
__asm__ (".weak " #name); \
__asm__ (#name " = " #real)
__asm__ (".weak " ASM_NAME(#name)); \
__asm__ (ASM_NAME(#name) " = " ASM_NAME(#real))
#else
#define use_default_symbol_version(real, name, version) \
__asm__ (".weak " #name); \
__asm__ (".set " #name "," #real)
__asm__ (".weak " ASM_NAME(#name)); \
__asm__ (".set " ASM_NAME(#name) "," ASM_NAME(#real))
#endif
#endif
#endif