Date: Mon, 20 May 2013 16:20:23 GMT From: Bert Regeer <bert.regeer@absio.com> To: freebsd-gnats-submit@FreeBSD.org Subject: amd64/178792: -march=native fails with clang on certain CPU's Message-ID: <201305201620.r4KGKN2u075820@oldred.FreeBSD.org> Resent-Message-ID: <201305201630.r4KGU0hq056021@freefall.freebsd.org>
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>Number: 178792
>Category: amd64
>Synopsis: -march=native fails with clang on certain CPU's
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-amd64
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Mon May 20 16:30:00 UTC 2013
>Closed-Date:
>Last-Modified:
>Originator: Bert Regeer
>Release: FreeBSD 9.1-RELEASE
>Organization:
Absio Corporation
>Environment:
FreeBSD TestVM.absio.local 9.1-RELEASE FreeBSD 9.1-RELEASE #0 r243825: Tue Dec 4 09:23:10 UTC 2012 root@farrell.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC amd64
>Description:
When compiling with clang passing the flag "-march=native" causes clang to fail with the following error message:
touch test.c
clang -march=native test.c
error: unknown target CPU 'i686'
This is an issue when the Python has also been installed with clang as the compiler, as all of the python packages from pypi that require a c compiler will invoke clang with the -march=native and fail.
It is only on certain CPU's that I am able to replicate the issue, see the following output from dmesg:
FreeBSD 9.1-RELEASE #0 r243825: Tue Dec 4 09:23:10 UTC 2012
root@farrell.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC amd64
CPU: Intel(R) Core(TM) i7-3615QM CPU @ 2.30GHz (2294.19-MHz K8-class CPU)
Origin = "GenuineIntel" Id = 0x306a9 Family = 6 Model = 3a Stepping = 9
Features=0xfa3fbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,DTS,MMX,FXSR,SSE,SSE2,SS>
Features2=0x9e982203<SSE3,PCLMULQDQ,SSSE3,CX16,SSE4.1,SSE4.2,POPCNT,AESNI,XSAVE,OSXSAVE,AVX,HV>
AMD Features=0x28100800<SYSCALL,NX,RDTSCP,LM>
AMD Features2=0x1<LAHF>
TSC: P-state invariant
>How-To-Repeat:
touch test.c
clang -march=native test.c
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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