[PATCH util/macros] Drop -fno-strict-aliasing from XORG_CWARNFLAGS

[Peter Harris]

On 2017-12-14 11:35 AM, Michel Dänzer wrote:
> I don't think compilers can reliably warn about all strict aliasing
> violations yet (ever?).
> 
> Is this really worth the risk? Do you have any numbers showing tangible
> benefits of this change?

The main benefit is in code cleanliness, not necessarily performance.

The risk if we don't make this change is to those of us with non-gcc
compilers (that don't have -fno-strict-aliasing or an equivalent as an
option). Replacing -fno-strict-aliasing with -Werror=strict-aliasing is
a step in the right direction.

Peter Harris
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