[Bug 257482] buildworld: clang segfaults building 12.2-RELEASE sources on 12.1-p13

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=257482

--- Comment #4 from Helio Luchtenberg Junior <helio.luchtenberg@gmail.com> ---
Second file cited on msg:  /tmp/TGParser-038627.cpp
it is too big for uploading.

More Information on this:

# uname -a
FreeBSD server00.hlj.com.br 12.1-RELEASE-p13 FreeBSD 12.1-RELEASE-p13 GENERIC 
amd64

Complete cronology:

- first installed 12.1-RELEASE from USB
- ran "freebsd-update fetch/install" successfully
- git clone --branch releng/12.2 to "/usr/src.new"
- cd /usr/src.new; make buildworld
Then the compiling fails with the message below, compiling original "/usr/src"
works perfectly:


Here are big part of the tail:

--- Target/Target.o ---
c++  -O2 -pipe -fno-common
-I/usr/obj/usr/src-12.2-p13/amd64.amd64/tmp/obj-tools/lib/clang/libllvm
-I/usr/src-12.2-p13/contrib/llvm-project/llvm/lib/Target/X86
-I/usr/src-12.2-p13/lib/clang/include
-I/usr/src-12.2-p13/contrib/llvm-project/llvm/include -D__STDC_CONSTANT_MACROS
-D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -DHAVE_VCS_VERSION_INC -DNDEBUG
-DLLVM_DEFAULT_TARGET_TRIPLE=\"x86_64-unknown-freebsd12.2\"
-DLLVM_HOST_TRIPLE=\"x86_64-unknown-freebsd12.2\"
-DDEFAULT_SYSROOT=\"/usr/obj/usr/src-12.2-p13/amd64.amd64/tmp\"
-DLLVM_TARGET_ENABLE_X86 -DLLVM_NATIVE_ASMPARSER=LLVMInitializeX86AsmParser
-DLLVM_NATIVE_ASMPRINTER=LLVMInitializeX86AsmPrinter
-DLLVM_NATIVE_DISASSEMBLER=LLVMInitializeX86Disassembler
-DLLVM_NATIVE_TARGET=LLVMInitializeX86Target
-DLLVM_NATIVE_TARGETINFO=LLVMInitializeX86TargetInfo
-DLLVM_NATIVE_TARGETMC=LLVMInitializeX86TargetMC -ffunction-sections
-fdata-sections -gline-tables-only -MD -MF.depend.Target_Target.o
-MTTarget/Target.o -Qunused-arguments
-I/usr/obj/usr/src-12.2-p13/amd64.amd64/tmp/legacy/usr/include  -fno-exceptions
-fno-rtti -gline-tables-only -std=c++14 -stdlib=libc++ -Wno-c++11-extensions 
-c /usr/src-12.2-p13/contrib/llvm-project/llvm/lib/Target/Target.cpp -o
Target/Target.o
--- TableGen/TGParser.o ---
c++: error: unable to execute command: Segmentation fault
c++: error: clang frontend command failed due to signal (use -v to see
invocation)
FreeBSD clang version 8.0.1 (tags/RELEASE_801/final 366581) (based on LLVM
8.0.1)
Target: x86_64-unknown-freebsd12.1
Thread model: posix
InstalledDir: /usr/bin
c++: note: diagnostic msg: PLEASE submit a bug report to
https://bugs.freebsd.org/submit/ and include the crash backtrace, preprocessed
source, and associated run script.
c++: note: diagnostic msg:
********************

PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
c++: note: diagnostic msg: /tmp/TGParser-038627.cpp
c++: note: diagnostic msg: /tmp/TGParser-038627.sh
c++: note: diagnostic msg:

********************
*** [TableGen/TGParser.o] Error code 254

make[4]: stopped in /usr/src-12.2-p13/lib/clang/libllvm
1 error

make[4]: stopped in /usr/src-12.2-p13/lib/clang/libllvm
*** [all_subdir_lib/clang/libllvm] Error code 2

make[3]: stopped in /usr/src-12.2-p13/lib/clang
1 error

make[3]: stopped in /usr/src-12.2-p13/lib/clang
*** [cross-tools] Error code 2

make[2]: stopped in /usr/src-12.2-p13
1 error

make[2]: stopped in /usr/src-12.2-p13
*** [_cross-tools] Error code 2

make[1]: stopped in /usr/src-12.2-p13
1 error

make[1]: stopped in /usr/src-12.2-p13
*** [buildworld] Error code 2

make: stopped in /usr/src-12.2-p13
1 error

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