[PATCH] x86: reject architecture settings that are invalid to be set from the command line (v2)

[H.J. Lu]

On Thu, Jun 10, 2010 at 8:13 AM, Jan Beulich <JBeulich@novell.com> wrote:
> So far, options like -march=i8086 were accepted despite the assembler
> subsequently choking on other consistency checks, leading to reasonably
> cryptic error messages. This patch makes it so that impossible
> architecure settings are neither accepted nor displayed (i.e. it is now
> made sure that those settings can only be used via directives).
>
> gas/
> 2010-06-10  Jan Beulich  <jbeulich@novell.com>
>
>        * config/tc-i386.c (md_parse_option): Ignore impossible processor
>        types.
>        (show_arch): New parameter 'check'.
>        (md_show_usage): Adjust calls to show_arch().
>
> --- a/gas/config/tc-i386.c
> +++ b/gas/config/tc-i386.c
> @@ -8166,6 +8166,11 @@ md_parse_option (int c, char *arg)
>              if (strcmp (arch, cpu_arch [j].name) == 0)
>                {
>                  /* Processor.  */
> +                 if (! (strcmp (default_arch, "i386")
> +                        ? cpu_arch[j].flags.bitfield.cpulm
> +                        : cpu_arch[j].flags.bitfield.cpui386))
> +                   continue;


This is still wrong:

[hjl@gnu-6 gas]$ ./as-new -march=i386 --32 x.s -o x.o
Assembler messages:
Fatal error: Invalid -march= option: `i386'
[hjl@gnu-6 gas]$

Please change it to

if (!cpu_arch[j].flags.bitfield.cpui386)
continue;


H.J.