diff options
Diffstat (limited to 'include/shlib-compat.h')
-rw-r--r-- | include/shlib-compat.h | 34 |
1 files changed, 26 insertions, 8 deletions
diff --git a/include/shlib-compat.h b/include/shlib-compat.h index c1c5e2c3b1..feacf35f03 100644 --- a/include/shlib-compat.h +++ b/include/shlib-compat.h @@ -1,5 +1,5 @@ /* Macros for managing ABI-compatibility definitions using ELF symbol versions. - Copyright (C) 2000-2016 Free Software Foundation, Inc. + Copyright (C) 2000-2018 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or @@ -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 +78,18 @@ #endif +/* Use compat_symbol_reference for a reference *or* definition of a + specific version of a symbol. Definitions are primarily used to + ensure tests reference the exact compat symbol required, or define an + interposing symbol of the right version e.g. __malloc_initialize_hook + in mcheck-init.c. Use compat_symbol to define such a symbol within + the shared libraries that are built for users. */ +#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. */ @@ -93,4 +101,14 @@ compat_symbol (libc, name, aliasname, version); # endif +/* The TEST_COMPAT macro acts just like the SHLIB_COMPAT macro except + that it does not check IS_IN. It is used by tests that are testing + functionality that is only available in specific GLIBC versions. */ + +# define TEST_COMPAT(lib, introduced, obsoleted) \ + _TEST_COMPAT (lib, introduced, obsoleted) +# define _TEST_COMPAT(lib, introduced, obsoleted) \ + (!(ABI_##lib##_##obsoleted - 0) \ + || ((ABI_##lib##_##introduced - 0) < (ABI_##lib##_##obsoleted - 0))) + #endif /* shlib-compat.h */ |