[INFO]: import of clang/LLVM to happen on June 9th
swell.k at gmail.com
Sat Jun 5 06:11:06 UTC 2010
Doug Barton <dougb at FreeBSD.org> writes:
> On 06/04/10 17:38, Doug Barton wrote:
>> On 06/04/10 11:28, Andrius Morkūnas wrote:
> Ok, everything in that section seems clear except this in 3.3:
> It is possible to completely replace CFLAGS and/or define custom
> CPUTYPE as well. We recommend setting CPUTYPE because many ports
> decide their optimizations flags based on this variable.
Most ports decide features based on MACHINE_CPU not CPUTYPE. However,
MACHINE_CPU doesn't support non-base compiler and `native' CPUTYPE. Plus
core2 CPUTYPE is silently degraded to nocona/prescott even when it's
supported by underlying compiler. See conf/112997.
> How do I figure out what to set for CPUTYPE? Also, what else should I
> include in CFLAGS besides -mssse3? I have a core 2 duo processor,
IIRC, on gcc44+ -march=native automatically enables -msse.
But if you don't want to use CPUTYPE=native then add cc1 flags to
$ gcc45 -E -v -march=native - </dev/null |& sed -nE 's/.*cc1 -E -quiet -v (- )?//p'
-march=core2 -mcx16 -msahf -msse4.1 --param l1-cache-size=32 --param l1-cache-line-size=64 --param l2-cache-size=6144 -mtune=core2
> which says this at boot time:
> CPU: Intel(R) Core(TM)2 CPU T7600 @ 2.33GHz (2330.23-MHz
> 686-class CPU)
> Origin = "GenuineIntel" Id = 0x6f6 Family = 6 Model = f Stepping = 6
> AMD Features=0x20100000<NX,LM>
> AMD Features2=0x1<LAHF>
> TSC: P-state invariant
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