Re: A patch to add --with-oldest-abi=ABI. [Re: A patch to add --disable-old-version.]

["H . J . Lu" <hjl at valinux dot com>]

On Sat, Dec 02, 2000 at 01:05:23AM -0800, Ulrich Drepper wrote:
> I have applied this patch now although I'm still not 100% satisfied:

Thanks. But there are no ChangeLog entries for this patch. BTW, have
you looked at my syscall patch for SHLIB_COMPAT?

> 
> - res_init is not handled correctly

What is wrong? There is

#if SHLIB_COMPAT(libc, GLIBC_2_0, GLIBC_2_2)
# undef res_init
weak_alias (__res_init, res_init);
#endif

It indicates that res_init is obsoleted by GLIBC_2.2.

# objdump --dynamic-sym libc.so.6 | grep res_init
000eaad0 g    DF .text  00000078  GLIBC_2.2   __res_init

res_init is gone with --with-oldest-abi=2.2.

> 
> - applications using the old interfaces start up with the reduced library
>   and will crash later.  This really has to be avoided.  Looking through

This a.out was compiled on glibc 2.0.

# objdump --dynamic-sym a.out| grep GLIBC
08048324  w   DF *UND*  00000074  GLIBC_2.0   __register_frame_info
08048334      DF *UND*  00000024  GLIBC_2.0   fprintf
08048344  w   DF *UND*  000000a2  GLIBC_2.0   __deregister_frame_info
08048354      DF *UND*  000000ed  GLIBC_2.0   fclose
08048364      DF *UND*  0000006e  GLIBC_2.0   fopen
08048374      DF *UND*  00000105  GLIBC_2.0   __libc_start_main
# /work/build/gnu/bin/glibc-current/elf/ld-linux.so.2 --library-path /work/build/gnu/bin/glibc-current ./a.out
./a.out: error while loading shared libraries: ./a.out: symbol fopen, version GLIBC_2.0 not defined in file libc.so.6 with link time reference

I must have missed something.

H.J.