Zack Weinberg wrote:
We could change the libc headers used on old-ILP32 ABIs so that _FILE_OFFSET_BITS=64 is defined by default (matching the LP64-ABI headers). This would break the ABI of every shared library that exports a structure (transitively) containing a field of type off_t, ino_t, fsblkcnt_t, fsfilcnt_t, or rlim_t.
As I understand it, most (all important?) such libraries are already compiled with _FILE_OFFSET_BITS=64 anyway, so their ABIs wouldn't break.
How about if we start the transition by deprecating the use of 32-bit off_t in user or library code on platforms with 32-bit long? The attached patch plus lots of similar patches, say (this is just a sketch). Really, it's long since time that file offsets were 64 bits.
diff --git a/libio/stdio.h b/libio/stdio.h index e37f901..a5f65e9 100644 --- a/libio/stdio.h +++ b/libio/stdio.h @@ -88,7 +88,11 @@ typedef _G_va_list va_list; #if defined __USE_UNIX98 || defined __USE_XOPEN2K # ifndef __off_t_defined # ifndef __USE_FILE_OFFSET64 +# if !_SUPPRESS_FILE_OFFSET_DEPRECATION && __LONG_MAX__ < __LONG_LONG_MAX__ +typedef __off_t off_t __attribute_deprecated__; +# else typedef __off_t off_t; +# endif # else typedef __off64_t off_t; # endif
