在 libunwind 上构建 LLVM 16（master）失败

Question

我正在尝试在 Ubuntu 22.04 上构建 LLVM master。 但是libunwind有错误。

CMake Error at /home/hxf0223/tmp/llvm-project/libunwind/src/CMakeLists.txt:109 (message):
  Compiler doesn't support generation of unwind tables if exception support
  is disabled.  Building libunwind DSO with runtime dependency on C++ ABI
  library is not supported.

构建命令是：

CC=clang CXX=clang++ cmake -GNinja -DCMAKE_BUILD_TYPE=Release -DLLVM_ENABLE_ASSERTIONS=ON  -DLLVM_ENABLE_PROJECTS="clang;clang-tools-extra;libclc;lld;lldb;mlir;polly;pstl" -DCOMPILER_RT_USE_BUILTINS_LIBRARY=ON -DLIBCXXABI_USE_COMPILER_RT=ON -DLIBCXXABI_USE_LLVM_UNWINDER=ON -DLIBCXX_USE_COMPILER_RT=ON -DLIBUNWIND_USE_COMPILER_RT=ON -DLLVM_ENABLE_EH=ON -DLLVM_ENABLE_RTTI=ON -DLLVM_ENABLE_RUNTIMES=all ../llvm

有没有人在更新大师上建立成功？ 谢谢！

Answer 1

来自 libunwind/src/CMakeLists.txt：

if (LIBUNWIND_ENABLE_SHARED AND
    NOT (LIBUNWIND_SUPPORTS_FNO_EXCEPTIONS_FLAG AND
         LIBUNWIND_SUPPORTS_FUNWIND_TABLES_FLAG))
  message(FATAL_ERROR
          "Compiler doesn't support generation of unwind tables if exception "
          "support is disabled.  Building libunwind DSO with runtime dependency "
          "on C++ ABI library is not supported.")
endif()

似乎在启用LIBUNWIND_ENABLE_SHARED时未设置LIBUNWIND_SUPPORTS_FUNWIND_TABLES_FLAG或LIBUNWIND_SUPPORTS_FNO_EXCEPTIONS_FLAG之一（或两者，我不是这方面的专家）时会出现错误。

您可以尝试手动设置它们或使用不同的编译器。