[Interest] building Qt 4.8.7 with gcc 5 and link-time optimisation on Linux

[René J. V. Bertin]

Thiago Macieira wrote:

>> But what about the fact that that those intrinsics are still used even when
>> configure is called with -no-sse4.1 and -no-sse4.2?
> 
> That shouldn't happen. QT_COMPILER_SUPPORTS_SSE4_2 should not be defined, so
> this wouldn't evaluate to true:
> 
> #if QT_COMPILER_SUPPORTS_HERE(SSE4_2)

That's what I figured and that's why I tried the options. I'll see if I can 
reproduce the issue and report back.

R.