issue with clang and CPUTYPE native

[Roman Divacky]

-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


and try to

clang -march=native hello_world.c

? I wonder what cpu (if any) is detected.


On Mon, Dec 27, 2010 at 09:35:59PM +0000, Alexander Best wrote:
> hi there,
> 
> i've been experiencing the following problems with clang during TARGET
> buildworld for quite a while now:
> 
> **** CODE ****
> clang++ -O2 -pipe -march=native -DIN_GLIBCPP_V3 -DHAVE_CONFIG_H -I/usr/subversion-src/gnu/lib/libsupc++/../../../contrib/gcclibs/include -I/usr/subversion-src/gnu/lib/libsupc++/../../../contrib/libstdc++/libsupc++ -I/usr/subversion-src/gnu/lib/libsupc++/../../../contrib/gcc -I/usr/subversion-src/gnu/lib/libsupc++/../libstdc++ -I. -frandom-seed=RepeatabilityConsideredGood -DNDEBUG -g -fstack-protector -fno-implicit-templates -ffunction-sections -fdata-sections -c /usr/subversion-src/gnu/lib/libsupc++/../../../contrib/libstdc++/libsupc++/tinfo2.cc
> clang++: warning: argument unused during compilation: '-fno-implicit-templates'
> clang++ -O2 -pipe -march=native -DIN_GLIBCPP_V3 -DHAVE_CONFIG_H -I/usr/subversion-src/gnu/lib/libsupc++/../../../contrib/gcclibs/include -I/usr/subversion-src/gnu/lib/libsupc++/../../../contrib/libstdc++/libsupc++ -I/usr/subversion-src/gnu/lib/libsupc++/../../../contrib/gcc -I/usr/subversion-src/gnu/lib/libsupc++/../libstdc++ -I. -frandom-seed=RepeatabilityConsideredGood -DNDEBUG -g -fstack-protector -fno-implicit-templates -ffunction-sections -fdata-sections -c /usr/subversion-src/gnu/lib/libsupc++/../../../contrib/libstdc++/libsupc++/vec.cc
> clang++: warning: argument unused during compilation: '-fno-implicit-templates'
> clang++ -O2 -pipe -march=native -DIN_GLIBCPP_V3 -DHAVE_CONFIG_H -I/usr/subversion-src/gnu/lib/libsupc++/../../../contrib/gcclibs/include -I/usr/subversion-src/gnu/lib/libsupc++/../../../contrib/libstdc++/libsupc++ -I/usr/subversion-src/gnu/lib/libsupc++/../../../contrib/gcc -I/usr/subversion-src/gnu/lib/libsupc++/../libstdc++ -I. -frandom-seed=RepeatabilityConsideredGood -DNDEBUG -g -fstack-protector -fno-implicit-templates -ffunction-sections -fdata-sections -c /usr/subversion-src/gnu/lib/libsupc++/../../../contrib/libstdc++/libsupc++/vterminate.cc
> clang++: warning: argument unused during compilation: '-fno-implicit-templates'
> clang -O2 -pipe -march=native -DIN_GLIBCPP_V3 -DHAVE_CONFIG_H -I/usr/subversion-src/gnu/lib/libsupc++/../../../contrib/gcclibs/include -I/usr/subversion-src/gnu/lib/libsupc++/../../../contrib/libstdc++/libsupc++ -I/usr/subversion-src/gnu/lib/libsupc++/../../../contrib/gcc -I/usr/subversion-src/gnu/lib/libsupc++/../libstdc++ -I. -frandom-seed=RepeatabilityConsideredGood -DNDEBUG -g -std=gnu99 -fstack-protector  -c /usr/subversion-src/gnu/lib/libsupc++/../../../contrib/gcclibs/libiberty/cp-demangle.c
> building static supc++ library
> ranlib libsupc++.a
> ===> gnu/lib/libobjc (all)
> gcc -O2 -pipe -march=native -DHAVE_GTHR_DEFAULT -DIN_GCC -DIN_TARGET_LIBS -I. -I/usr/subversion-src/gnu/lib/libobjc/../../usr.bin/cc/cc_tools -I/usr/subversion-src/gnu/lib/libobjc/../../../contrib/libobjc/objc -I/usr/subversion-src/gnu/lib/libobjc/../../../contrib/libobjc -I/usr/subversion-src/gnu/lib/libobjc/../../../contrib/gcc/config -I/usr/subversion-src/gnu/lib/libobjc/../../../contrib/gcc -I/usr/subversion-src/gnu/lib/libobjc/../../../contrib/gcclibs/include -fexceptions -frandom-seed=RepeatabilityConsideredGood -DNDEBUG -g -std=gnu99 -fstack-protector  -c /usr/subversion-src/gnu/lib/libobjc/../../../contrib/libobjc/archive.c
> *** Signal 11
> 
> Stop in /usr/subversion-src/gnu/lib/libobjc.
> *** Error code 1
> 
> Stop in /usr/subversion-src/gnu/lib.
> *** Error code 1
> 
> Stop in /usr/subversion-src.
> *** Error code 1
> 
> Stop in /usr/subversion-src.
> *** Error code 1
> 
> Stop in /usr/subversion-src.
> *** Error code 1
> 
> Stop in /usr/subversion-src.
> **** CODE ****
> 
> i've finally figured out that the following line in make.conf is causing the
> problem:
> 
> CPUTYPE ?= native
> 
> if i remove it or change it to CPUTYPE ?= nocona everything works fine. if i'm
> using gcc as compiler, having CPUTYPE ?= native in my make.conf causes no harm.
> 
> this is on amd64 and a very recent HEAD snapshot.
> 
> can somebody verify this issue?
> 
> cheers.
> alex
> 
> -- 
> a13x
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