[master] 777e03ba9 Disable strict aliasing with gcc where vtree.h is used

[Nils Goroll]

late response to an email which I had overlooked:

On 24/03/2021 18:46, Dridi Boukelmoune wrote:
>>     (*(uintptr_t *)&(parent)->entry.rbe_parent) &= ~((uintptr_t)3);
> Is culprit code part of generated vtree.h functions? Or macros that we
> may call directly?

Yes, this is some of the problematic code that the VRBT macros expand to.

>>     https://www.gnu.org/software/automake/manual/html_node/Per_002dObject-Flags.html
> If this is only in generated functions, we may be able to annotate
> them with some kind of v_no_strict_aliasing_ attribute.

Good idea, we could try __attribute__ ((__may_alias__))

https://gcc.gnu.org/onlinedocs/gcc/Common-Type-Attributes.html#Common-Type-Attributes

I have not looked at how invasive this would be.

Nils
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