Build fails on Mac M4: LLDB test suite requires libc++ but it is disabled

[steven-studio]

Environment

• Mac M4
• macOS version: [請填]
• LLVM commit: [請填，如有]

Build Command

cmake -G "Unix Makefiles" -DLLVM_ENABLE_PROJECTS="clang;lld;lldb" -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=./install ../llvm

Observed error

CMake Error at /Users/youzhewei/Desktop/llvm-project/lldb/test/CMakeLists.txt:201 (message):
  LLDB test suite requires libc++, but it is currently disabled.  Please add
  `libcxx` to `LLVM_ENABLE_RUNTIMES` or disable tests via
  `LLDB_INCLUDE_TESTS=OFF.

Expectation
CMake should configure successfully, or at least document proper flags for Mac M4 builds with lldb enabled.

Steps tried
• Re-checked cmake flags
• No explicit disabling of libcxx

Thanks!

[ldionne]

I think the error message is sufficiently clear about what is wrong and what you should do to fix it:

 LLDB test suite requires libc++, but it is currently disabled.  Please add
  `libcxx` to `LLVM_ENABLE_RUNTIMES` or disable tests via
  `LLDB_INCLUDE_TESTS=OFF.

Closing as NTBF.