[Bug 263019] lang/gcc10 build fails with Illegal instruction

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=263019

            Bug ID: 263019
           Summary: lang/gcc10 build fails with Illegal instruction
           Product: Ports & Packages
           Version: Latest
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: gerald@FreeBSD.org
          Reporter: shurd@FreeBSD.org
          Assignee: gerald@FreeBSD.org
             Flags: maintainer-feedback?(gerald@FreeBSD.org)

Created attachment 232910
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=232910&action=edit
Last boot (pending rebot to latest patch level)

When building lang/gcc10 on a Xeon D-1587, the build fails at:

/usr/ports/lang/gcc10/work/.build/./gcc/xgcc
-B/usr/ports/lang/gcc10/work/.build/./gcc/
-B/usr/local/x86_64-portbld-freebsd13.0/bin/
-B/usr/local/x86_64-portbld-freebsd13.0/lib/ -isystem
/usr/local/x86_64-portbld-freebsd13.0/include -isystem
/usr/local/x86_64-portbld-freebsd13.0/sys-include   -fno-checking -g -O2 -pipe
-DLIBICONV_PLUG -fstack-protector-strong -fno-strict-aliasing -m32 -O2  -g -O2
-pipe  -DLIBICONV_PLUG -fstack-protector-strong -fno-strict-aliasing  -DIN_GCC 
  -W -Wall -Wno-narrowing -Wwrite-strings -Wcast-qual -Wno-error=format-diag
-Wno-format -Wstrict-prototypes -Wmissing-prototypes -Wno-error=format-diag
-Wold-style-definition  -isystem ./include  -fpic -pthread -g -DIN_LIBGCC2
-fbuilding-libgcc -fno-stack-protector  -fpic -pthread -I. -I. -I../../.././gcc
-I/usr/ports/lang/gcc10/work/gcc-10.3.0/libgcc
-I/usr/ports/lang/gcc10/work/gcc-10.3.0/libgcc/.
-I/usr/ports/lang/gcc10/work/gcc-10.3.0/libgcc/../gcc
-I/usr/ports/lang/gcc10/work/gcc-10.3.0/libgcc/../include  -DHAVE_CC_TLS  -o
_mulxc3.o -MT _mulxc3.o -MD -MP -MF _mulxc3.dep -DL_mulxc3 -c
/usr/ports/lang/gcc10/work/gcc-10.3.0/libgcc/libgcc2.c -fvisibility=hidden
-DHIDE_EXPORTS
during RTL pass: expand
/usr/ports/lang/gcc10/work/gcc-10.3.0/libgcc/libgcc2.c: In function '__mulxc3':
/usr/ports/lang/gcc10/work/gcc-10.3.0/libgcc/libgcc2.c:1989:10: internal
compiler error: Illegal instruction
 1989 |       if (isinf (a) || isinf (b))
      |          ^
no stack trace because unwind library not available

This appears to be related to floating point in some way.  I've tried with and
without the bootstrap method.

CPU is:
CPU: Intel(R) Xeon(R) CPU D-1587 @ 1.70GHz (1700.03-MHz K8-class CPU)
  Origin="GenuineIntel"  Id=0x50664  Family=0x6  Model=0x56  Stepping=4
 
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=0x7ffefbff<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,AESNI,
XSAVE,OSXSAVE,AVX,F16C,RDRAND>
  AMD Features=0x2c100800<SYSCALL,NX,Page1GB,RDTSCP,LM>
  AMD Features2=0x121<LAHF,ABM,Prefetch>
  Structured Extended
Features=0x21cbfbb<FSGSBASE,TSCADJ,BMI1,HLE,AVX2,SMEP,BMI2,ERMS,INVPCID,RTM,PQM,NFPUSG,PQE,RDSEED,ADX,SMAP,PROCTRACE>
  XSAVE Features=0x1<XSAVEOPT>
  VT-x: PAT,HLT,MTF,PAUSE,EPT,UG,VPID,VID,PostIntr
  TSC: P-state invariant, performance statistics

A full MAKE_JOBS_UNSAFE build log should usually be fetchable from
http://home.bbsdev.net/tmp/buildlog.txt

Attaching dmesg.boot

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