Date: Thu, 30 Dec 2010 18:40:48 +0000 From: Alexander Best <arundel@freebsd.org> To: Roman Divacky <rdivacky@freebsd.org> Cc: freebsd-toolchain@freebsd.org Subject: Re: issue with clang and CPUTYPE native Message-ID: <20101230184048.GA34628@freebsd.org> In-Reply-To: <20101230081445.GA99446@freebsd.org> References: <20101227213559.GA53178@freebsd.org> <20101228142203.GA69674@freebsd.org> <20101230002033.GA23583@freebsd.org> <20101230081445.GA99446@freebsd.org>
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On Thu Dec 30 10, Roman Divacky wrote: > On Thu, Dec 30, 2010 at 12:20:33AM +0000, Alexander Best wrote: > > On Tue Dec 28 10, Roman Divacky wrote: > > > -march=native in clang works by detecting CPU name > > > and passing it (if found) to llvm. if the CPU is not > > > detected nothing is passed. > > > > > > nocona is supported > > > > > > ie. leaving the CPUNAME empty or specifying it to "nocona" should > > > be equivalent to setting it to "native". > > > > > > > > > can you apply this patch: > > > > > > Index: Driver/Tools.cpp > > > =================================================================== > > > --- Driver/Tools.cpp (revision 122591) > > > +++ Driver/Tools.cpp (working copy) > > > @@ -684,6 +684,7 @@ > > > // FIXME: We should also incorporate the detected target features for use > > > // with -native. > > > std::string CPU = llvm::sys::getHostCPUName(); > > > + llvm::outs() << "detected CPU = " << CPU << "\n"; > > > if (!CPU.empty()) > > > CPUName = Args.MakeArgString(CPU); > > > } else > > > > thanks a lot for the patch. i've applied it, but am not sure how to only > > compile clang. 'make' in usr.bin/clang fails. do i have to run target > > buildworld or is there a way to only build clang? > > I would guess that cd lib/clang && make && cd ../../usr.bin/clang && make > should work, if not - full buildworld is necessary I guess thanks. that worked. this is what clang detects as my cpu: -march=native this the dmesg output: CPU: Intel(R) Pentium(R) Dual CPU E2160 @ 1.80GHz (2394.05-MHz K8-class CPU) Origin = "GenuineIntel" Id = 0x6fd Family = 6 Model = f Stepping = 13 Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE> Features2=0xe39d<SSE3,DTES64,MON,DS_CPL,EST,TM2,SSSE3,CX16,xTPR,PDCM> AMD Features=0x20100800<SYSCALL,NX,LM> AMD Features2=0x1<LAHF> TSC: P-state invariant cheers. alex -- a13x
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