diff options
Diffstat (limited to 'lib/eu-config.h')
| -rw-r--r-- | lib/eu-config.h | 65 |
1 files changed, 53 insertions, 12 deletions
diff --git a/lib/eu-config.h b/lib/eu-config.h index f0e3d07a..c7d7cbb2 100644 --- a/lib/eu-config.h +++ b/lib/eu-config.h @@ -176,27 +176,68 @@ asm (".section predict_data, \"aw\"; .previous\n" /* This macro is used by the tests conditionalize for standalone building. */ #define ELFUTILS_HEADER(name) <lib##name.h> +/* Don't reorder with global asm blocks or optimize away. (Doesn't reliably + keep it in the same LTO partition, though; -flto-partition=none may be + still needed for some gcc versions < 10.) */ +#ifdef __has_attribute +# if __has_attribute(no_reorder) +# define used_in_asm __attribute__ ((externally_visible, no_reorder)) +# endif +#endif +#ifndef used_in_asm +# define used_in_asm /* empty */ +#endif #ifdef SYMBOL_VERSIONING -# define OLD_VERSION(name, version) \ - asm (".globl _compat." #version "." #name "\n" \ - "_compat." #version "." #name " = " #name "\n" \ - ".symver _compat." #version "." #name "," #name "@" #version); -# define NEW_VERSION(name, version) \ - asm (".symver " #name "," #name "@@@" #version); -# define COMPAT_VERSION_NEWPROTO(name, version, prefix) \ - asm (".symver _compat." #version "." #name "," #name "@" #version); \ +# define NEW_INTDEF(name) __typeof (name) INTUSE(name) \ + __attribute__ ((alias ("_new." #name))) attribute_hidden; +# ifdef __has_attribute +# if __has_attribute(symver) +# define NEW_VERSION(name, version) \ + __typeof (name) name __asm__ ("_new." #name) \ + __attribute__ ((symver (#name "@@" #version))); +# define OLD_VERSION(name, version) _OLD_VERSION1(name, __COUNTER__, version) +# define _OLD_VERSION1(name, num, version) _OLD_VERSION2(name, num, version) +# define _OLD_VERSION2(name, num, version) \ + __typeof (name) _compat_old##num##_##name \ + __asm__ ("_compat." #version "." #name) \ + __attribute__ ((alias ("_new." #name), symver (#name "@" #version))); +# define COMPAT_VERSION_NEWPROTO(name, version, prefix) \ __typeof (_compat_##prefix##_##name) _compat_##prefix##_##name \ - asm ("_compat." #version "." #name); -# define COMPAT_VERSION(name, version, prefix) \ + __asm__ ("_compat." #version "." #name) \ + __attribute__ ((symver (#name "@" #version))); +# define COMPAT_VERSION(name, version, prefix) \ asm (".symver _compat." #version "." #name "," #name "@" #version); \ - __typeof (name) _compat_##prefix##_##name asm ("_compat." #version "." #name); + __typeof (name) _compat_##prefix##_##name \ + __asm__ ("_compat." #version "." #name) \ + __attribute__ ((symver (#name "@" #version))); +# endif +# endif +# ifndef NEW_VERSION +# define OLD_VERSION(name, version) \ + asm (".globl _compat." #version "." #name "\n\t" \ + "_compat." #version "." #name " = _new." #name "\n\t" \ + ".symver _compat." #version "." #name "," #name "@" #version); +# define NEW_VERSION(name, version) \ + __typeof (name) name __asm__ ("_new." #name) used_in_asm; \ + asm (".symver _new." #name ", " #name "@@" #version); +# define COMPAT_VERSION_NEWPROTO(name, version, prefix) \ + __typeof (_compat_##prefix##_##name) _compat_##prefix##_##name \ + __asm__ ("_compat." #version "." #name) used_in_asm; \ + asm (".symver _compat." #version "." #name ", " #name "@" #version); +# define COMPAT_VERSION(name, version, prefix) \ + __typeof (name) _compat_##prefix##_##name \ + __asm__ ("_compat." #version "." #name) used_in_asm; \ + asm (".symver _compat." #version "." #name ", " #name "@" #version); +# endif #else +# define NEW_INTDEF(name) INTDEF(name) # define OLD_VERSION(name, version) /* Nothing for static linking. */ # define NEW_VERSION(name, version) /* Nothing for static linking. */ # define COMPAT_VERSION_NEWPROTO(name, version, prefix) \ error "should use #ifdef SYMBOL_VERSIONING" -# define COMPAT_VERSION(name, version, prefix) error "should use #ifdef SYMBOL_VERSIONING" +# define COMPAT_VERSION(name, version, prefix) \ + error "should use #ifdef SYMBOL_VERSIONING" #endif #ifndef FALLTHROUGH |