[1/2] Add -B support to gcc-ar/ranlib/nm

From: Andi Kleen <ak@linux.intel.com>

To use gcc-{ar,ranlib} for boot strap we need to add a -B option
to the tool. Since ar has weird and unusual argument conventions
implement the code by hand instead of using any libraries.

v2: Fix typo
v3: Improve comments. Use strlen. Use DIR_SEPARATOR. Add prefixes at
begin.

gcc/:

2014-08-31  Andi Kleen  <ak@linux.intel.com>

	* file-find.c (add_prefix_begin): Add.
	(do_add_prefix): Rename from add_prefix with first argument.
	(add_prefix): Add new wrapper.
	* file-find.h (add_prefix_begin): Add.
	* gcc-ar.c (main): Support -B option.
---
 gcc/file-find.c | 23 ++++++++++++++++++++---
 gcc/file-find.h |  1 +
 gcc/gcc-ar.c    | 43 +++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 64 insertions(+), 3 deletions(-)

On Sun, Aug 31, 2014 at 4:51 PM, Andi Kleen <andi@firstfloor.org> wrote:
> From: Andi Kleen <ak@linux.intel.com>
>
> To use gcc-{ar,ranlib} for boot strap we need to add a -B option
> to the tool. Since ar has weird and unusual argument conventions
> implement the code by hand instead of using any libraries.
>
> v2: Fix typo
> v3: Improve comments. Use strlen. Use DIR_SEPARATOR. Add prefixes at
> begin.

Ok.

Thanks,
Richard.

> gcc/:
>
> 2014-08-31  Andi Kleen  <ak@linux.intel.com>
>
>         * file-find.c (add_prefix_begin): Add.
>         (do_add_prefix): Rename from add_prefix with first argument.
>         (add_prefix): Add new wrapper.
>         * file-find.h (add_prefix_begin): Add.
>         * gcc-ar.c (main): Support -B option.
> ---
>  gcc/file-find.c | 23 ++++++++++++++++++++---
>  gcc/file-find.h |  1 +
>  gcc/gcc-ar.c    | 43 +++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 64 insertions(+), 3 deletions(-)
>
> diff --git a/gcc/file-find.c b/gcc/file-find.c
> index 87d486d..be608b2 100644
> --- a/gcc/file-find.c
> +++ b/gcc/file-find.c
> @@ -105,15 +105,16 @@ find_a_file (struct path_prefix *pprefix, const char *name, int mode)
>    return 0;
>  }
>
> -/* Add an entry for PREFIX to prefix list PPREFIX.  */
> +/* Add an entry for PREFIX to prefix list PREFIX.
> +   Add at beginning if FIRST is true.  */
>
>  void
> -add_prefix (struct path_prefix *pprefix, const char *prefix)
> +do_add_prefix (struct path_prefix *pprefix, const char *prefix, bool first)
>  {
>    struct prefix_list *pl, **prev;
>    int len;
>
> -  if (pprefix->plist)
> +  if (pprefix->plist && !first)
>      {
>        for (pl = pprefix->plist; pl->next; pl = pl->next)
>         ;
> @@ -138,6 +139,22 @@ add_prefix (struct path_prefix *pprefix, const char *prefix)
>    *prev = pl;
>  }
>
> +/* Add an entry for PREFIX at the end of prefix list PREFIX.  */
> +
> +void
> +add_prefix (struct path_prefix *pprefix, const char *prefix)
> +{
> +  do_add_prefix (pprefix, prefix, false);
> +}
> +
> +/* Add an entry for PREFIX at the begin of prefix list PREFIX.  */
> +
> +void
> +add_prefix_begin (struct path_prefix *pprefix, const char *prefix)
> +{
> +  do_add_prefix (pprefix, prefix, true);
> +}
> +
>  /* Take the value of the environment variable ENV, break it into a path, and
>     add of the entries to PPREFIX.  */
>
> diff --git a/gcc/file-find.h b/gcc/file-find.h
> index b438056..0754d99 100644
> --- a/gcc/file-find.h
> +++ b/gcc/file-find.h
> @@ -40,6 +40,7 @@ struct path_prefix
>  extern void find_file_set_debug (bool);
>  extern char *find_a_file (struct path_prefix *, const char *, int);
>  extern void add_prefix (struct path_prefix *, const char *);
> +extern void add_prefix_begin (struct path_prefix *, const char *);
>  extern void prefix_from_env (const char *, struct path_prefix *);
>  extern void prefix_from_string (const char *, struct path_prefix *);
>
> diff --git a/gcc/gcc-ar.c b/gcc/gcc-ar.c
> index aebaa92..b5199e6 100644
> --- a/gcc/gcc-ar.c
> +++ b/gcc/gcc-ar.c
> @@ -132,9 +132,52 @@ main (int ac, char **av)
>    const char **nargv;
>    bool is_ar = !strcmp (PERSONALITY, "ar");
>    int exit_code = FATAL_EXIT_CODE;
> +  int i;
>
>    setup_prefixes (av[0]);
>
> +  /* Not using getopt for now.  */
> +  for (i = 0; i < ac; i++)
> +      if (!strncmp (av[i], "-B", 2))
> +       {
> +         const char *arg = av[i] + 2;
> +         const char *end;
> +         size_t len;
> +
> +         memmove (av + i, av + i + 1, sizeof (char *) * ((ac + 1) - i));
> +         ac--;
> +         if (*arg == 0)
> +           {
> +             arg = av[i + 1];
> +             if (!arg)
> +               {
> +                 fprintf (stderr, "Usage: gcc-ar [-B prefix] ar arguments ...\n");
> +                 exit (EXIT_FAILURE);
> +               }
> +             memmove (av + i, av + i + 1, sizeof (char *) * ((ac + 1) - i));
> +             ac--;
> +             i++;
> +           }
> +         /* else it's a joined argument  */
> +
> +         len = strlen (arg);
> +         if (len > 0)
> +                 len--;
> +         end = arg + len;
> +
> +         /* Always add a dir separator for the prefix list.  */
> +         if (end > arg && !IS_DIR_SEPARATOR (*end))
> +           {
> +             static const char dir_separator_str[] = { DIR_SEPARATOR, 0 };
> +             arg = concat (arg, dir_separator_str, NULL);
> +           }
> +
> +         add_prefix_begin (&path, arg);
> +         add_prefix_begin (&target_path, arg);
> +         break;
> +       }
> +
> +
>    /* Find the GCC LTO plugin */
>    plugin = find_a_file (&target_path, LTOPLUGINSONAME, R_OK);
>    if (!plugin)
> --
> 2.0.4
>