Problems building libc++ for MemorySanitizer

[Desperado17]

I try to build an instrumented libc++ to avoid false positives with memorysanitizer according to this manual:
https://github.com/google/sanitizers/wiki/MemorySanitizerLibcxxHowTo

Clang 14, Ubuntu 22.04, x64

Unfortunately, it doesn't work.

First of all the call

cmake -GNinja ../llvm
-DCMAKE_BUILD_TYPE=Release
-DLLVM_ENABLE_PROJECTS="libcxx;libcxxabi"
-DCMAKE_C_COMPILER=clang
-DCMAKE_CXX_COMPILER=clang++
-DLLVM_USE_SANITIZER=MemoryWithOrigins

fails with

CMake Error at CMakeLists.txt:130 (MESSAGE):
libcxx isn't a known project:
bolt;clang;clang-tools-extra;compiler-rt;cross-project-tests;libc;libclc;lld;lldb;mlir;openmp;polly;pstl;flang.
Did you mean to enable it as a runtime in LLVM_ENABLE_RUNTIMES?

So I try

cmake -GNinja ../llvm
-DCMAKE_BUILD_TYPE=Release
-DLLVM_ENABLE_RUNTIMES="libcxx;libcxxabi"
-DCMAKE_C_COMPILER=clang
-DCMAKE_CXX_COMPILER=clang++
-DLLVM_USE_SANITIZER=MemoryWithOrigins

and it fails with

[221/1510] Building IntrinsicsS390.h...
FAILED: include/llvm/IR/IntrinsicsS390.h /home/user/instrumentedlibcpp/llvm-project/build/include/llvm/IR/IntrinsicsS390.h
cd /home/user/instrumentedlibcpp/llvm-project/build && /home/user/instrumentedlibcpp/llvm-project/build/bin/llvm-min-tblgen -gen-intrinsic-enums -intrinsic-prefix=s390 -I /home/user/instrumentedlibcpp/llvm-project/llvm/include/llvm/IR -I/home/user/instrumentedlibcpp/llvm-project/build/include -I/home/user/instrumentedlibcpp/llvm-project/llvm/include /home/user/instrumentedlibcpp/llvm-project/llvm/include/llvm/IR/Intrinsics.td --write-if-changed -o include/llvm/IR/IntrinsicsS390.h -d include/llvm/IR/IntrinsicsS390.h.d
==59846==WARNING: MemorySanitizer: use-of-uninitialized-value
#0 0x5575aa91fc4d in _M_is_local /usr/bin/../lib/gcc/x86_64-linux-gnu/12/../../../../include/c++/12/bits/basic_string.h:275:6
#1 0x5575aa91fc4d in operator= /usr/bin/../lib/gcc/x86_64-linux-gnu/12/../../../../include/c++/12/bits/basic_string.h:867:12
#2 0x5575aa91fc4d in ParseCommandLineOptions /home/user/instrumentedlibcpp/llvm-project/llvm/lib/Support/CommandLine.cpp:1502:15
#3 0x5575aa91fc4d in llvm::cl::ParseCommandLineOptions(int, char const* const*, llvm::StringRef, llvm::raw_ostream*, char const*, bool) /home/user/instrumentedlibcpp/llvm-project/llvm/lib/Support/CommandLine.cpp:1451:24
#4 0x5575aa82a765 in main /home/user/instrumentedlibcpp/llvm-project/llvm/utils/TableGen/TableGen.cpp:82:3
#5 0x7c2a48229d8f in __libc_start_call_main csu/../sysdeps/nptl/libc_start_call_main.h:58:16
#6 0x7c2a48229e3f in __libc_start_main csu/../csu/libc-start.c:392:3
#7 0x5575aa78ef54 in _start (/home/user/instrumentedlibcpp/llvm-project/build/bin/llvm-min-tblgen+0x2df54) (BuildId: 4841a2ffffe3c7bb16513e25069a7e3d1d433c62)

Uninitialized value was created by an allocation of 'ref.tmp13.i' in the stack frame of function '_ZN4llvm2cl23ParseCommandLineOptionsEiPKPKcNS_9StringRefEPNS_11raw_ostreamES2_b'
#0 0x5575aa9121d0 in llvm::cl::ParseCommandLineOptions(int, char const* const*, llvm::StringRef, llvm::raw_ostream*, char const*, bool) /home/user/instrumentedlibcpp/llvm-project/llvm/lib/Support/CommandLine.cpp:1431

SUMMARY: MemorySanitizer: use-of-uninitialized-value /usr/bin/../lib/gcc/x86_64-linux-gnu/12/../../../../include/c++/12/bits/basic_string.h:275:6 in _M_is_local
Exiting
[228/1510] Building CXX object lib/DebugInfo/CodeView/CMakeFiles/LLVMDebugInfoCodeView.dir/LazyRandomTypeCollection.cpp.o
ninja: build stopped: subcommand failed.

Any ideas how to fix this?

Regards

[jpflori]

Same issue for me.
Isn't there a bootstrap issue with llvm-min-tblgen?