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docker - 如何通过 LLVM build_docker_image.sh 默认使用 libc++ 构建 clang?

转载 作者:行者123 更新时间:2023-12-02 18:29:24 24 4
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我想用 clang 6 和 libc++ 作为默认的 C++ 标准库构建一个 docker 容器。我想包含(并使用)LLVM 项目 clang、libcxx、libcxxabi、lld 和 compiler-rt。

要将 libc++ 设置为默认值,我使用了 CMAKE 选项 CLANG_DEFAULT_CXX_STDLIB=libc++ (另外 DCLANG_DEFAULT_RTLIB=compiler-rt 默认为 compiler-rt)。第一阶段构建确实有效,但似乎没有安装 libc++:

$ git clone https://github.com/llvm-mirror/llvm.git
$ cd llvm
$ git checkout release_60
$ utils/docker/build_docker_image.sh -s debian8 \
-d "clang" -t "6" --branch branches/release_60 \
-p compiler-rt -p libcxxabi -p libcxx -p clang \
-i stage2-install-compiler-rt \
-i stage2-install-libcxxabi \
-i stage2-install-libcxx \
-i stage2-install-clang \
-i stage2-install-clang-headers -- \
-DCMAKE_BUILD_TYPE=Release \
-DCLANG_DEFAULT_CXX_STDLIB=libc++ \
-DCLANG_DEFAULT_RTLIB=compiler-rt \
-DLIBCXXABI_USE_LLVM_UNWINDER=YES \
-DCLANG_ENABLE_BOOTSTRAP=ON \
-DBOOTSTRAP_CMAKE_BUILD_TYPE=Release \
-DBOOTSTRAP_CLANG_DEFAULT_CXX_STDLIB=libc++ \
-DBOOTSTRAP_CLANG_DEFAULT_RTLIB=compiler-rt \
-DBOOTSTRAP_LIBCXX_USE_COMPILER_RT=YES \
-DBOOTSTRAP_LIBCXXABI_USE_COMPILER_RT=YES \
-DCLANG_BOOTSTRAP_TARGETS="install-compiler-rt;install-libcxxabi;install-libcxx;install-clang;install-clang-headers"

在第二阶段构建中,我得到:
[...]
-- The C compiler identification is Clang 6.0.1
-- The CXX compiler identification is Clang 6.0.1
-- The ASM compiler identification is unknown
-- Found assembler: /tmp/clang-build/build/./bin/clang
-- Check for working C compiler: /tmp/clang-build/build/./bin/clang
-- Check for working C compiler: /tmp/clang-build/build/./bin/clang -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: /tmp/clang-build/build/./bin/clang++
-- Check for working CXX compiler: /tmp/clang-build/build/./bin/clang++ -- broken
CMake Error at /usr/local/share/cmake-3.7/Modules/CMakeTestCXXCompiler.cmake:44 (message):
The C++ compiler "/tmp/clang-build/build/./bin/clang++" is not able to
compile a simple test program.

It fails with the following output:

Change Dir: /tmp/clang-build/build/tools/clang/stage2-bins/CMakeFiles/CMakeTmp



Run Build Command:"/usr/bin/ninja" "cmTC_d8e88"

[1/2] Building CXX object CMakeFiles/cmTC_d8e88.dir/testCXXCompiler.cxx.o

[2/2] Linking CXX executable cmTC_d8e88

FAILED: : && /tmp/clang-build/build/./bin/clang++
CMakeFiles/cmTC_d8e88.dir/testCXXCompiler.cxx.o -o cmTC_d8e88 && :

/usr/bin/ld: cannot find -lc++

clang-6.0: error: linker command failed with exit code 1 (use -v to see
invocation)

ninja: build stopped: subcommand failed.





CMake will not be able to correctly generate this project.
Call Stack (most recent call first):
CMakeLists.txt:45 (project)
[...]

单阶段构建似乎已成功完成:
$ git clone https://github.com/llvm-mirror/llvm.git
$ cd llvm
$ git checkout release_60
$ utils/docker/build_docker_image.sh -s debian8 \
-d "clang-1stage" -t "6" --branch branches/release_60 \
-p compiler-rt -p libcxxabi -p libcxx -p clang \
-i install-compiler-rt \
-i install-libcxxabi \
-i install-libcxx \
-i install-clang \
-i install-clang-headers -- \
-DCMAKE_BUILD_TYPE=Release \
-DCLANG_DEFAULT_CXX_STDLIB=libc++ \
-DCLANG_DEFAULT_RTLIB=compiler-rt

但是当我运行容器时,链接也存在问题:
$ docker run -it clang:6
root@1e95a7ffe57a:/# echo "#include <iostream>" > main.cpp
root@1e95a7ffe57a:/# echo "int main(){ std::cout << \"Hello World\\n\"; }" >> main.cpp
root@1e95a7ffe57a:/# clang++ main.cpp
/usr/bin/ld: /tmp/main-7d03e7.o: undefined reference to symbol '_Unwind_Resume@@GCC_3.0'
//lib/x86_64-linux-gnu/libgcc_s.so.1: error adding symbols: DSO missing from command line
clang-6.0: error: linker command failed with exit code 1 (use -v to see invocation)

我究竟做错了什么?

最佳答案

您缺少另一个 LLVM 项目,libunwind .

LLVM 的 libunwind 提供了一个轻量级的堆栈展开接口(interface),并与 libcxx 和 libcxxabi 紧密耦合。

您应该在 projects 中查看 libunwind文件夹,它应该由 LLVM 自动选择。您可能还需要添加 -DLIBCXXABI_USE_LLVM_UNWINDER=YES到 CMake 命令行。

有用链接:Clang 8 documentation - Assembling a Complete Toolchain .

关于docker - 如何通过 LLVM build_docker_image.sh 默认使用 libc++ 构建 clang?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/51713120/

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