[PATCH v5] objcopy: add option to specify custom prefix for symbol of binary input

[Alan Modra]

On Mon, Oct 27, 2025 at 03:53:48PM +0200, Alon Bar-Lev wrote:
> --- a/bfd/bfd.c
> +++ b/bfd/bfd.c
> @@ -105,6 +105,9 @@ CODE_FRAGMENT
>  .  {* The filename the application opened the BFD with.  *}
>  .  const char *filename;
>  .
> +.  {* The symbol name for the file or NULL.  *}
> +.  const char *binary_symbol_prefix;
> +.

Move this to binary.c line 44, without the special markup, and better
call the variable _bfd_binary_symbol_prefix.  We're just giving a side
channel from binutils/objcopy.c to bfd/binary.c.  (See for example
_bfd_srec_len.)  No need for any bfd.c changes.  I don't think it
makes sense to add a pointer to every bfd opened just for a "clean"
interface.  Yes, it would be nice to tidy these some day, and get rid
of most libbfd static variables too, but that's probably a job for a
global maintainer.

> diff --git a/binutils/objcopy.c b/binutils/objcopy.c
> index 9373b75d6ed..6613af01bab 100644
> --- a/binutils/objcopy.c
> +++ b/binutils/objcopy.c
> @@ -334,6 +334,7 @@ enum command_line_switch
>    OPTION_HEAP,
>    OPTION_IMAGE_BASE,
>    OPTION_IMPURE,
> +  OPTION_INPUT_SYMBOL,
>    OPTION_INTERLEAVE_WIDTH,
>    OPTION_KEEPGLOBAL_SYMBOLS,
>    OPTION_KEEP_FILE_SYMBOLS,

Let's make that enum better match the changed option name.  You can
simplify your objcopy.c patch too, just write directly to
_bfd_binary_symbol_prefix in copy_main.

-- 
Alan Modra