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Add support for referencing specific symbol versions

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This is needed for writing tests of compat symbols.
This commit is contained in:
Florian Weimer 2016-08-02 17:18:08 +02:00
parent f690b56979
commit 968dc26df6
3 changed files with 37 additions and 12 deletions
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12
ChangeLog
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@ -1,3 +1,15 @@
2016-08-02 Florian Weimer <fweimer@redhat.com>
Support linking against compatibility symbols, for use in tests.
* include/libc-symbols.h (symbol_version_reference): New macro.
(symbol_version): Use it.
* include/shlib-compat.h: Unconditionally include <abi-versions.h>.
(compat_symbol): Use compat_symbol_reference.
(compat_symbol_1, compat_symbol_2): Remove.
(compat_symbol_reference, compat_symbol_reference_1)
(compat_symbol_reference_2): New macro. Use
symbol_version_reference.
2016-08-02 Florian Weimer <fweimer@redhat.com>
[BZ #19469]

19
include/libc-symbols.h
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@ -282,19 +282,28 @@ for linking")
past the last element in SET. */
#define symbol_set_end_p(set, ptr) ((ptr) >= (void *const *) &__stop_##set)
/* 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. */
#ifdef __ASSEMBLER__
# define symbol_version_reference(real, name, version) \
.symver real, name##@##version
#else /* !__ASSEMBLER__ */
# define symbol_version_reference(real, name, version) \
__asm__ (".symver " #real "," #name "@" #version)
#endif
#ifdef SHARED
# define symbol_version(real, name, version) \
_symbol_version(real, name, version)
symbol_version_reference(real, name, version)
# define default_symbol_version(real, name, version) \
_default_symbol_version(real, name, version)
# ifdef __ASSEMBLER__
# define _symbol_version(real, name, version) \
.symver real, name##@##version
# define _default_symbol_version(real, name, version) \
.symver real, name##@##@##version
# else
# define _symbol_version(real, name, version) \
__asm__ (".symver " #real "," #name "@" #version)
# define _default_symbol_version(real, name, version) \
__asm__ (".symver " #real "," #name "@@" #version)
# endif

18
include/shlib-compat.h
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@ -19,10 +19,10 @@
#ifndef _SHLIB_COMPAT_H
#define _SHLIB_COMPAT_H 1
#ifdef SHARED
# include <abi-versions.h>
#ifdef SHARED
/* The file abi-versions.h (generated by scripts/abi-versions.awk) defines
symbols like `ABI_libm_GLIBC_2_0' for each version set in the source
code for each library. For a version set that is subsumed by a later
@ -62,11 +62,7 @@
default_symbol_version (local, symbol, name)
# define compat_symbol(lib, local, symbol, version) \
compat_symbol_1 (lib, local, symbol, version)
# define compat_symbol_1(lib, local, symbol, version) \
compat_symbol_2 (local, symbol, VERSION_##lib##_##version)
# define compat_symbol_2(local, symbol, name) \
symbol_version (local, symbol, name)
compat_symbol_reference (lib, local, symbol, version)
#else
@ -82,6 +78,14 @@
#endif
/* Use compat_symbol_reference for a reference to a specific version
of a symbol. Use compat_symbol to define such a symbol. */
#define compat_symbol_reference(lib, local, symbol, version) \
compat_symbol_reference_1 (lib, local, symbol, version)
#define compat_symbol_reference_1(lib, local, symbol, version) \
compat_symbol_reference_2 (local, symbol, VERSION_##lib##_##version)
#define compat_symbol_reference_2(local, symbol, name) \
symbol_version_reference (local, symbol, name)
# ifdef LINK_OBSOLETE_RPC
/* Export the symbol for both static and dynamic linking. */