Re: CURRENT: build failure with clang 3.7.0

On Wed, 7 Oct 2015 13:23:48 +0200
Dimitry Andric <dim_at_FreeBSD.org> wrote:

> On 07 Oct 2015, at 09:37, O. Hartmann <ohartman_at_zedat.fu-berlin.de> wrote:
> > 
> > I hit on a box this nasty/sticky error when performing buildworld.
> > 
> > /usr/src is on r288980
> ...
> > --- ieee802_11_common.o ---
> ...
> > -c /usr/src/usr.sbin/wpa/wpa_supplicant/../../../contrib/wpa//src/common/ieee802_11_common.c
> > -o ieee802_11_common.o Cannot emit physreg copy instruction UNREACHABLE
> > executed
> > at /usr/src/lib/clang/libllvmx86codegen/../../../contrib/llvm/lib/Target/X86/X86InstrInfo.cpp:3935!
> 
> Somebody else reported the same to me yesterday.  This is an upstream
> bug with AVX (which is still present in llvm trunk), so for now you need
> to set your CPUTYPE to something that doesn't have AVX, or simply unset
> your CPUTYPE.
> 
> The bug has been reported upstream, and once there is a fix, I will
> import it ASAP.
> 
> -Dimitry
> 

When I allow to build with CXXFLAGS+=              -std=c++11 set
in /etx/src.conf, I get the below shown error.

Funny, I have several other boxes, definitely having AVX aboard:

[... from dmesg]
Jul 29 07:05:52 freyja kernel: CPU: Intel(R) Xeon(R) CPU E5-1650 v3 _at_ 3.50GHz
(3491.98-MHz K8-class CPU)
Jul 29 07:05:52 freyja kernel: Origin="GenuineIntel"  Id=0x306f2  Family=0x6
Model=0x3f  Stepping=2
Jul 29 07:05:52 freyja kernel:
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>
Jul 29 07:05:52 freyja kernel:
Features2=0x7dfefbff<SSE3,PCLMULQDQ,DTES64,MON,DS_CPL,VMX,SMX,EST,TM2,SSSE3,SDBG,FMA,CX16,xTPR,PDCM,PCID,DCA,SSE4.1,SSE4.2,x2APIC,MOVBE,POPCNT,TSCDLT,XSAVE,OSXSAVE,AVX,F16C,RDRAND>
Jul 29 07:05:52 freyja kernel: AMD
Features=0x2c100800<SYSCALL,NX,Page1GB,RDTSCP,LM>
Jul 29 07:05:52 freyja kernel: AMD Features2=0x21<LAHF,ABM>
Jul 29 07:05:52 freyja kernel: Structured Extended
Features=0x37ab<FSGSBASE,TSCADJ,BMI1,AVX2,SMEP,BMI2,ERMS,INVPCID,PQM,NFPUSG>

[...]

which is a most recent Haswell XEON and builds world fine. My personal failing
box is a i3-32XX, IvyBridge, but the IvyBridge E3-124XX XEON builds well.

The output shown below and the error I reported is from this hardware:

CPU: Intel(R) Core(TM) i5-3470 CPU _at_ 3.20GHz (3192.81-MHz K8-class CPU)
  Origin="GenuineIntel"  Id=0x306a9  Family=0x6  Model=0x3a  Stepping=9
  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=0x7fbae3ff<SSE3,PCLMULQDQ,DTES64,MON,DS_CPL,VMX,SMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,PCID,SSE4.1,SSE4.2,x2APIC,POPCNT,TSCDLT,AESNI,XSAVE,OSXSAVE,AVX,F16C,RDRAND>
  AMD Features=0x28100800<SYSCALL,NX,RDTSCP,LM>
  AMD Features2=0x1<LAHF>
  Structured Extended Features=0x281<FSGSBASE,SMEP,ERMS>
  XSAVE Features=0x1<XSAVEOPT>
  VT-x: PAT,HLT,MTF,PAUSE,EPT,UG,VPID
  TSC: P-state invariant, performance statistics


The buildworld error when building with CXXFLAGS+=              -std=c++11 is
then 

[...]
cc   -O2 -pipe -O3 -O3 -pipe -march=native  -I.
-I/usr/obj/usr/src/lib/ncurses/menu/../ncurses
-I/usr/src/lib/ncurses/menu/../ncurses -I/usr/src/lib/ncurses/menu/../ncurses
-I/usr/src/lib/ncurses/menu/../../../contrib/ncurses/include
-I/usr/src/lib/ncurses/menu/../../../contrib/ncurses/ncurses -Wall -DNDEBUG
-DHAVE_CONFIG_H -I/usr/src/lib/ncurses/menu/../../../contrib/ncurses/menu
-std=gnu99 -fstack-protector-strong -Wsystem-headers -Werror -Wall
-Wno-format-y2k -W -Wno-unused-parameter -Wstrict-prototypes
-Wmissing-prototypes -Wpointer-arith -Wno-uninitialized -Wno-pointer-sign
-Wno-empty-body -Wno-string-plus-int -Wno-unused-const-variable
-Wno-tautological-compare -Wno-unused-value -Wno-parentheses-equality
-Wno-unused-function -Wno-enum-conversion -Wno-unused-local-typedef
-Qunused-arguments
-c /usr/src/lib/ncurses/menu/../../../contrib/ncurses/menu/m_pad.c -o m_pad.o
--- all_subdir_atf --- In file included
from /usr/src/contrib/atf/atf-c++/detail/application.cpp:26: In file included
from /usr/src/contrib/atf/atf-c++/detail/application.hpp:29: In file included
from /usr/obj/usr/src/tmp/usr/include/c++/v1/ostream:138: In file included
from /usr/obj/usr/src/tmp/usr/include/c++/v1/ios:216: In file included
from /usr/obj/usr/src/tmp/usr/include/c++/v1/__locale:15: /usr/obj/usr/src/tmp/usr/include/c++/v1/string:1938:44:
error: 'basic_string<_CharT, _Traits, _Allocator>' is missing exception
specification
'noexcept(is_nothrow_copy_constructible<allocator_type>::value)' [-Werror]
basic_string<_CharT, _Traits, _Allocator>::basic_string(const allocator_type&
__a) ^ /usr/obj/usr/src/tmp/usr/include/c++/v1/string:1326:40: note: previous
declaration is here _LIBCPP_INLINE_VISIBILITY explicit basic_string(const
allocator_type& __a)