diff options
Diffstat (limited to 'sysdeps/generic/libc-symver.h')
| -rw-r--r-- | sysdeps/generic/libc-symver.h | 56 |
1 files changed, 53 insertions, 3 deletions
diff --git a/sysdeps/generic/libc-symver.h b/sysdeps/generic/libc-symver.h index 11c77ae1cd..69d147e2a8 100644 --- a/sysdeps/generic/libc-symver.h +++ b/sysdeps/generic/libc-symver.h @@ -22,17 +22,67 @@ #ifndef _LIBC_SYMVER_H #define _LIBC_SYMVER_H 1 +#include <config.h> + /* Use symbol_version_reference to specify the version a symbol reference should link to. Use symbol_version or default_symbol_version for the definition of a versioned symbol. The difference is that the latter is a no-op in non-shared - builds. */ + builds. + + _set_symbol_version is similar to symbol_version_reference, except + that this macro expects the name and symbol version as a single + string or token sequence, with an @ or @@ separator. (A string is + used in C mode and a token sequence in assembler mode.) + _set_symbol_version only be used for definitions because it may + introduce an alias symbol that would not be globally unique for + mere references. The _set_symbol_version macro is used to define + default_symbol_version and compat_symbol. */ + #ifdef __ASSEMBLER__ # define symbol_version_reference(real, name, version) \ .symver real, name##@##version -#else /* !__ASSEMBLER__ */ +#else # define symbol_version_reference(real, name, version) \ __asm__ (".symver " #real "," #name "@" #version) -#endif +#endif /* !__ASSEMBLER__ */ + +#if SYMVER_NEEDS_ALIAS +/* If the assembler cannot support multiple versions for the same + symbol, introduce __SInnn_ aliases to which the symbol version is + attached. */ +# define __symbol_version_unique_concat(x, y) __SI ## x ## _ ## y +# define _symbol_version_unique_concat(x, y) \ + __symbol_version_unique_concat (x, y) +# define _symbol_version_unique_alias(name) \ + _symbol_version_unique_concat (name, __COUNTER__) +# ifdef __ASSEMBLER__ +# define _set_symbol_version_2(real, alias, name_version) \ + .globl alias ASM_LINE_SEP \ + .equiv alias, real ASM_LINE_SEP \ + .symver alias, name_version +# else +# define _set_symbol_version_2(real, alias, name_version) \ + __asm__ (".globl " #alias "\n\t" \ + ".equiv " #alias ", " #real "\n\t" \ + ".symver " #alias "," name_version) +# endif +# define _set_symbol_version_1(real, alias, name_version) \ + _set_symbol_version_2 (real, alias, name_version) +/* REAL must be globally unique, so that the counter also produces + globally unique symbols. */ +# define _set_symbol_version(real, name_version) \ + _set_symbol_version_1 (real, _symbol_version_unique_alias (real), \ + name_version) +# else /* !SYMVER_NEEDS_ALIAS */ +# ifdef __ASSEMBLER__ +# define _set_symbol_version(real, name_version) \ + .symver real, name_version +# else +# define _set_symbol_version(real, name_version) \ + __asm__ (".symver " #real "," name_version) +# endif +#endif /* !SYMVER_NEEDS_ALIAS */ + #endif /* _LIBC_SYMVER_H */ |