diff options
Diffstat (limited to 'libio/libio.h')
| -rw-r--r-- | libio/libio.h | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/libio/libio.h b/libio/libio.h index 12826ffe11..edf52401f3 100644 --- a/libio/libio.h +++ b/libio/libio.h @@ -472,11 +472,25 @@ extern _IO_wint_t _IO_getwc (_IO_FILE *__fp) __THROW; extern _IO_wint_t _IO_putwc (wchar_t __wc, _IO_FILE *__fp) __THROW; extern int _IO_fwide (_IO_FILE *__fp, int __mode) __THROW; # if __GNUC__ >= 2 +/* While compiling glibc we have to handle compatibility with very old + versions. */ +# if defined _LIBC && defined SHARED +# include <shlib-compat.h> +# if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_1) +# define _IO_fwide_maybe_incompatible \ + (__builtin_expect (&_IO_stdin_used == NULL, 0)) +extern const int _IO_stdin_used; +weak_extern (_IO_stdin_used); +# endif +# endif +# ifndef _IO_fwide_maybe_incompatible +# define _IO_fwide_maybe_incompatible (0) +# endif /* A special optimized version of the function above. It optimizes the case of initializing an unoriented byte stream. */ # define _IO_fwide(__fp, __mode) \ ({ int __result = (__mode); \ - if (__result < 0) \ + if (__result < 0 && ! _IO_fwide_maybe_incompatible) \ { \ if ((__fp)->_mode == 0) \ /* We know that all we have to do is to set the flag. */ \ |