[Bug driver/37551] gcc help should provide subarchitecture details

["pinskia at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #1 from pinskia at gmail dot com  2008-09-17 03:09 -------
Subject: Re:   New: gcc help should provide subarchitecture details



Sent from my iPhone

On Sep 16, 2008, at 7:44 PM, "martinrb at google dot com"
<gcc-bugzilla@gcc.gnu.org 
 > wrote:

> How do I find out whether a particular gcc supports a
> particular subarchitecture, e.g. MMX instructions, by default?
> If the gcc has been configured --with-arch=XXXX,
> I can get that value using:
> gcc -v --help 2>&1 | grep 'Configured with'
>
> but if the arch has defaulted based on the target triplet,
> it is less obvious.  Is it documented that
> configure i486-xxxxxx
> is equivalent to
> configure .... --with-arch=i486
> ?
>
> Even better, it would be nice if gcc -v --help
> said something like:
> mmx support is enabled (use -mno-mmx to disable it)
> sse support is disabled (use -msse to enable it)
>
> I would have guessed gcc -dumpspecs would give me
> this kind of information, but it appears not to.

This is already done in 4.3.0 where it shows the options and what are  
enabled already.

>
>
>
> -- 
>           Summary: gcc help should provide subarchitecture details
>           Product: gcc
>           Version: 4.2.3
>            Status: UNCONFIRMED
>          Severity: normal
>          Priority: P3
>         Component: driver
>        AssignedTo: unassigned at gcc dot gnu dot org
>        ReportedBy: martinrb at google dot com
>  GCC host triplet: x86_64-linux-gnu
>
>
> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37551
>


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37551