[Bug 246274] 11.2-STABLE/i386 to 11.3-STABLE/i386 buildworld fails: clang Abort trap

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=246274

--- Comment #7 from Dimitry Andric <dim at FreeBSD.org> ---
Yeah, this looks about the same. I tried installing 11.2-RELEASE which comes
with clang version 6.0.0 (tags/RELEASE_600/final 326565), and that gives:

$ /usr/bin/time -l clang -cc1 -triple i386-unknown-freebsd11.2 -emit-obj
-disable-free -disable-llvm-verifier -discard-value-names -main-file-name
AArch64InstPrinter.cpp -mrelocation-model static -mthread-model posix
-mdisable-fp-elim -masm-verbose -mconstructor-aliases -target-cpu i486
-dwarf-column-info -debugger-tuning=gdb -ffunction-sections -fdata-sections
-coverage-notes-file
/usr/obj/home/src/tmp/home/src/lib/clang/libllvm/Target/AArch64/MCTargetDesc/AArch64InstPrinter.gcno
-D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -D
HAVE_VCS_VERSION_INC -D NDEBUG -D
LLVM_DEFAULT_TARGET_TRIPLE=\"i386-unknown-freebsd11.4\" -D
LLVM_HOST_TRIPLE=\"i386-unknown-freebsd11.4\" -D
DEFAULT_SYSROOT=\"/usr/obj/home/src/tmp\" -D LLVM_TARGET_ENABLE_AARCH64 -D
LLVM_TARGET_ENABLE_ARM -D LLVM_TARGET_ENABLE_MIPS -D LLVM_TARGET_ENABLE_POWERPC
-D LLVM_TARGET_ENABLE_SPARC -D LLVM_TARGET_ENABLE_X86 -D
LLVM_NATIVE_ASMPARSER=LLVMInitializeX86AsmParser -D
LLVM_NATIVE_ASMPRINTER=LLVMInitializeX86AsmPrinter -D
LLVM_NATIVE_DISASSEMBLER=LLVMInitializeX86Disassembler -D
LLVM_NATIVE_TARGET=LLVMInitializeX86Target -D
LLVM_NATIVE_TARGETINFO=LLVMInitializeX86TargetInfo -D
LLVM_NATIVE_TARGETMC=LLVMInitializeX86TargetMC -O2 -Wno-c++11-extensions
-std=c++11 -fdeprecated-macro -ferror-limit 19 -fmessage-length 0 -fno-rtti
-fobjc-runtime=gnustep -fdiagnostics-show-option -vectorize-loops
-vectorize-slp -x c++ AArch64InstPrinter-5a6d13.cpp
      165.43 real        30.21 user        45.18 sys
   3876424  maximum resident set size
     60691  average shared memory size
       436  average unshared data size
       271  average unshared stack size
   4423574  page reclaims
    130240  page faults
         0  swaps
         0  block input operations
         5  block output operations
         0  messages sent
         0  messages received
         0  signals received
    130255  voluntary context switches
       958  involuntary context switches

so it takes ~3.7 GiB and a *long* time to compile, though it does not crash.

With -O1, it takes about 20 seconds and ~250 MiB instead, so I suggest using
that for now.

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