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

[Thiago Macieira]

On Sunday 26 July 2015 12:24:04 René J. V. Bertin wrote:
> Thiago Macieira wrote:
> >> %> clang -dM -E -xc /dev/null | fgrep -i SSE
> >> #define __SSE2_MATH__ 1
> >> #define __SSE2__ 1
> >> #define __SSE3__ 1
> >> #define __SSE_MATH__ 1
> >> #define __SSE__ 1
> >> #define __SSSE3__ 1
> > 
> > This confirms it enables SSS3 by default, but not SSE4.1.
> 
> I didn't check this yet:
> 
> %> clang -dM -E -xc -mno-sse3 /dev/null | fgrep -i SSE
> #define __SSE2_MATH__ 1
> #define __SSE2__ 1
> #define __SSE_MATH__ 1
> #define __SSE__ 1
> 
> So it is still possible to override the default (fortunately). 

But it's unnecessary since all Mac x86 hardware has SSE3 and all 64-bit x86 
hardware has SSSE3.

-- 
Thiago Macieira - thiago.macieira (AT) intel.com
  Software Architect - Intel Open Source Technology Center