Re: [Minios-devel] Should we have to be aware of GCC version in Unikraft?

[Simon Kuenzer <simon.kuenzer@xxxxxxxxx>]

Hey Wei,

we have some code in the build system that stores the used GCC version 
in a variable already. Have a look to Makefile in the base directory and 
search for CC_VERSION. Maybe you need to modify it - e.g., separate 
major and minor number. There is no code or Makefile that uses this 
variable currently. So, you do not need to worry that something would break.
On 12.03.2018 08:26, Wei Chen wrote:
> Hi Simon,
>
> In Unikraft, we will add corresponding GCC flags to do processor optimization
> for target processor. In this case, I want to list a full set of standard ARMv8
> Cortex-A series processors (from Cortex-a53 to latest Cortex-a75) in this menu.
>
> But different GCC version supports different processors set for -mtune. For
> example the latest gcc-7 can support the full set of standard ARMv8 Cortex-A
> series processors, but gcc-4.9 only supports cortex-a53 and cortex-a57. Other
> processor values for -mtune will get an error about "invalid parameter" for
> gcc-4.9.
What I would raise an error with Make via the architecture's Makefile.uk 
if the used GCC version is too old for a specific CPU mtune switch. The 
error should tell the user that a newer GCC version is required.
> In this case, should we import the GCC version into Unikraft's build system?
> If yes, we can provide different processor list for different GCC version.
> Another method is to use a minimal set of processors (cortex-a53, cortex-a57)
> to avoid such error. But we will not be able to optimize code for latest ARM
> processors.
>
> I am not sure whether x86 has similar issue?
Did not happen yet but might in the future, too.

> Regards,
> Wei Chen
Thanks,

Simon

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