Re: [patch] amdgcn: config.gcc - enable gfx1030 and gfx1100 multilib; add them to the docs

[Thomas Schwinge <tschwinge@baylibre.com>]

Hi!

Great progress that you've made!  :-)

On 2024-01-26T13:32:02+0100, Tobias Burnus <tburnus@baylibre.com> wrote:
> Tobias Burnus wrote:
>> Am 24.01.24 um 17:01 schrieb Tobias Burnus:
>>> Okay to enable gfx1100 multilib building and to document gfx1100 in 
>>> the manual?
>>
>> and, with this patch, additionally gfx1030?

> amdgcn: config.gcc - enable gfx1030 and gfx1100 multilib; add them to the docs

> --- a/gcc/doc/install.texi
> +++ b/gcc/doc/install.texi
> @@ -1258,12 +1258,12 @@ default set of libraries is selected based on the value of
>  
>  @item amdgcn*-*-*
>  @var{list} is a comma separated list of ISA names (allowed values: @code{fiji},
> -@code{gfx900}, @code{gfx906}, @code{gfx908}, @code{gfx90a}). It ought not
> -include the name of the default ISA, specified via @option{--with-arch}.  If
> -@var{list} is empty, then there will be no multilibs and only the default
> -run-time library will be built.  If @var{list} is @code{default} or
> -@option{--with-multilib-list=} is not specified, then the default set of
> -libraries is selected.
> +@code{gfx900}, @code{gfx906}, @code{gfx908}, @code{gfx90a}, @code{gfx1030},
> +@code{gfx1100}).  It ought not include the name of the default ISA, specified
> +via @option{--with-arch}.  If @var{list} is empty, then there will be no
> +multilibs and only the default run-time library will be built.  If @var{list}
> +is @code{default} or @option{--with-multilib-list=} is not specified, then
> +the default set of libraries is selected.

Further down in that file, we state:

    @anchor{amdgcn-x-amdhsa}
    @heading amdgcn-*-amdhsa
    AMD GCN GPU target.
    
    Instead of GNU Binutils, you will need to install LLVM 13.0.1, or later, [...]

LLVM 13.0.1 may still be fine for gfx1030
('[...]/amdgcn-amdhsa/gfx1030/libgcc' does get built; I've not further
tested), but it's not sufficient for gfx1100 anymore:

    [...]
    checking for suffix of object files... configure: error: in `[...]/amdgcn-amdhsa/gfx1100/libgcc':
    configure: error: cannot compute suffix of object files: cannot compile
    See `config.log' for more details
    make[1]: *** [Makefile:14105: configure-target-libgcc] Error 1
    [...]

'[...]/amdgcn-amdhsa/gfx1100/libgcc/config.log':

    [...]
    'gfx1100' is not a recognized processor for this target (ignoring processor)
    'gfx1100' is not a recognized processor for this target (ignoring processor)
    /tmp/ccZdohcj.s:1:17: error: .amdgcn_target directive's target id amdgcn-unknown-amdhsa--gfx1100 does not match the specified target id amdgcn-unknown-amdhsa--gfx000
            .amdgcn_target "amdgcn-unknown-amdhsa--gfx1100"
                           ^
    [...]

Which version of LLVM should we be recommending?


Grüße
 Thomas