Re: gfortran: error: unrecognized argument in option '-mcmodel=medium'

[Iain Sandoe <iain@sandoe.co.uk>]

> On 27 Sep 2023, at 08:33, Iain Sandoe <iain@sandoe.co.uk> wrote:
> 
> 
> 
>> On 27 Sep 2023, at 08:25, Andrew Pinski via Fortran <fortran@gcc.gnu.org> wrote:
>> 
>> On Tue, Sep 26, 2023 at 11:39 PM Richard Biener via Fortran
>> <fortran@gcc.gnu.org> wrote:
>>> 
>>> On Tue, Sep 26, 2023 at 4:44 PM Lingadahally, Vishakha (2023)
>>> <Vishakha.Lingadahally.2023@live.rhul.ac.uk> wrote:
>>>> 
>>>> Dear GCC Team,
>>>> 
>>>> I'm running Ubuntu 22 on my Mac virtually and my gfortran version is 11.4.0. When I try to install a certain software package, I encounter the following error:
>>>> 
>>>> gfortran: error: unrecognized argument in option '-mcmodel=medium'
>>>> gfortran: note: valid arguments to '-mcmodel=' are: large small tiny
>>>> 
>>>> Is this due to attempting to run gfortran on arm64 architecture? Could you please let me know how I could resolve the issue?
>>> 
>>> You have to turn to Ubuntu here, -mcmodel=medium is certainly
>>> supported in GCC 11, maybe Ubuntu patches out
>>> the support?
>> 
>> Well -mcmodel=medium is the x86_64 specific option while they are
>> trying to run on aarch64 which has a different set options.
> 
> 
> The current Arm64 port (aarch64 on macOS) only supports the “small” mcmodel
> “tiny” is not supported by macOS and we have not yet implemented “large”.
> 
> Despite it’s name “small” should suffice as an approximate equivalent for the
> x86_64 “medium” (at least on macOS).
> 
> So, either you need to change the flag depending on the architecture, or omit it
> (on macOS currently GCC only supports the default mcmodel).
> 
> We plan to support the “large” model at some stage on Arm64 (but unlikely for
> GCC 14)

Ah, and now I see you are not running native so the comments above are not
relevant.
Iain