[PATCH 6/6] elf: Simplify output of hwcap subdirectories in ld.so help

[Carlos O'Donell]

On Wed, Sep 14, 2022 at 08:15:09PM +0200, Javier Pello wrote:
> The print_hwcap_1 machinery was useful for the legacy hwcaps
> subdirectories, but it is not worth the trouble now that they
> are gone.

This fails pre-commit CI for i686:
https://patchwork.sourceware.org/project/glibc/patch/20220914201509.1c642836df76f95d3c2a8f28@otheo.eu/

Which architectures have you tested this on?

> Signed-off-by: Javier Pello <devel@otheo.eu>
> ---
>  elf/dl-usage.c | 43 +++++++------------------------------------
>  1 file changed, 7 insertions(+), 36 deletions(-)
> 
> diff --git a/elf/dl-usage.c b/elf/dl-usage.c
> index efd6c77c..754a6391 100644
> --- a/elf/dl-usage.c
> +++ b/elf/dl-usage.c
> @@ -104,34 +104,6 @@ print_search_path_for_help (struct dl_main_state *state)
>    print_search_path_for_help_1 (__rtld_search_dirs.dirs);
>  }
>  
> -/* Helper function for printing flags associated with a HWCAP name.  */
> -static void
> -print_hwcap_1 (bool *first, bool active, const char *label)
> -{
> -  if (active)
> -    {
> -      if (*first)
> -        {
> -          _dl_printf (" (");
> -          *first = false;
> -        }
> -      else
> -        _dl_printf (", ");
> -      _dl_printf ("%s", label);
> -    }
> -}
> -
> -/* Called after a series of print_hwcap_1 calls to emit the line
> -   terminator.  */
> -static void
> -print_hwcap_1_finish (bool *first)
> -{
> -  if (*first)
> -    _dl_printf ("\n");
> -  else
> -    _dl_printf (")\n");
> -}
> -
>  /* Print the header for print_hwcaps_subdirectories.  */
>  static void
>  print_hwcaps_subdirectories_header (bool *nothing_printed)
> @@ -165,9 +137,7 @@ print_hwcaps_subdirectories (const struct dl_main_state *state)
>      {
>        print_hwcaps_subdirectories_header (&nothing_printed);
>        print_hwcaps_subdirectories_name (&split);
> -      bool first = true;
> -      print_hwcap_1 (&first, true, "searched");
> -      print_hwcap_1_finish (&first);
> +      _dl_printf (" (searched)\n");
>      }
>  
>    /* The built-in glibc-hwcaps subdirectories.  Do the filtering
> @@ -178,13 +148,14 @@ print_hwcaps_subdirectories (const struct dl_main_state *state)
>      {
>        print_hwcaps_subdirectories_header (&nothing_printed);
>        print_hwcaps_subdirectories_name (&split);
> -      bool first = true;
> -      print_hwcap_1 (&first, mask & 1, "supported");
>        bool listed = _dl_hwcaps_contains (state->glibc_hwcaps_mask,
>                                           split.segment, split.length);
> -      print_hwcap_1 (&first, !listed, "masked");
> -      print_hwcap_1 (&first, (mask & 1) && listed, "searched");
> -      print_hwcap_1_finish (&first);
> +      if (mask & 1)
> +        _dl_printf (" (supported, %s)\n", listed ? "searched" : "masked");
> +      else if (!listed)
> +        _dl_printf (" (masked)\n");
> +      else
> +        _dl_printf ("\n");
>        mask >>= 1;
>      }
>  
> -- 
> 2.36.0
>