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

[Wei Chen <Wei.Chen@xxxxxxx>]

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.

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?

Regards,
Wei Chen
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