使用cmake构建和打包LLVM clang 3.4

Question

我cmake大约两周前开始学习并喜欢它.到目前为止,我已经成功地构建和包装(与本地系统封装格式)libc++abi,libc++,llvm3.4所有cmake(libc++abi我自己cmake设置)为RHEL 6.x中,20 +的Fedora和Ubuntu 12.04 LTS +.

我想创建一个C++构建环境

1. 让我们libstdc++完全依赖GNU GCC(因此我们不希望从上述发行版或LLVM Debian/Ubuntu夜间软件包下载站点获得任何LLVM RPM/DEB )
2. 使我们能够完全探索C++ 11和C++ 1y.换句话说,我们可以尝试,甚至我们想同时保持我们所有的编译系统干净,包管理系统最前沿LLVM /铛随时随地.

尽管如此,我试图在运行Ubuntu 12.04 LTS 64bit的构建主机上构建clang3.4 cmake,并使用由我构建的纯粹的 clang 3.3 而不依赖于GNU libstdc++,以及libc++3.3和libc++abi.后两者也没有libstdc++依赖.我也是这样建造的.

我非常了解Clang - Getting Started网页,并成功使用了那里的说明.但这些正是我不想使用的.他们是不正确太:对CMakeLists.txt的clang3.4明确规定如下:

 1  # If we are not building as a part of LLVM, build Clang as an
 2  # standalone project, using LLVM as an external library:
 3  if( CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR )
 4    project(Clang)
 5    cmake_minimum_required(VERSION 2.8)
 6  
 7    set(CLANG_PATH_TO_LLVM_SOURCE "" CACHE PATH
 8      "Path to LLVM source code. Not necessary if using an installed LLVM.")
 9    set(CLANG_PATH_TO_LLVM_BUILD "" CACHE PATH
10      "Path to the directory where LLVM was built or installed.")

请参阅第1行和第2行.但是,我还没有找到任何有关如何设置的LLVM文档CLANG_PATH_TO_LLVM_BUILD.我尝试了以下方法:

cmake -DCLANG_PATH_TO_LLVM_BUILD="../../llvm-3.4/build" ..

并得到以下错误:

$ clang3.4/_tars/clang-3.4/build$ cmake -DCLANG_PATH_TO_LLVM_BUILD="../../llvm-3.4/build" ..
-- The C compiler identification is Clang 3.3.0
-- The CXX compiler identification is Clang 3.3.0
-- Check for working C compiler: /usr/bin/clang
-- Check for working C compiler: /usr/bin/clang -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/clang++
-- Check for working CXX compiler: /usr/bin/clang++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
CMake Error at CMakeLists.txt:39 (include):
  include could not find load file:

    AddLLVM


CMake Error at CMakeLists.txt:40 (include):
  include could not find load file:

    TableGen


-- Performing Test C_SUPPORTS_FLAG
-- Performing Test C_SUPPORTS_FLAG - Success
-- Performing Test CXX_SUPPORTS_FLAG
-- Performing Test CXX_SUPPORTS_FLAG - Success
-- Building with -fPIC
-- Performing Test SUPPORTS_FVISIBILITY_INLINES_HIDDEN_FLAG
-- Performing Test SUPPORTS_FVISIBILITY_INLINES_HIDDEN_FLAG - Success
-- Found LibXml2: /usr/lib/x86_64-linux-gnu/libxml2.so (found version "2.7.8") 
-- Clang version: 3.4
-- Performing Test CXX_SUPPORTS_NO_NESTED_ANON_TYPES_FLAG
-- Performing Test CXX_SUPPORTS_NO_NESTED_ANON_TYPES_FLAG - Success
CMake Error at utils/TableGen/CMakeLists.txt:3 (add_tablegen):
  Unknown CMake command "add_tablegen".


-- Configuring incomplete, errors occurred!

但那不对!LLVM + compiler-rt已经使用我们自己的构建主机安装DEB.和,

$ llvm/clang3.4/_tars/clang-3.4/build$ ls /usr/share/llvm/cmake
AddLLVM.cmake             ChooseMSVCCRT.cmake      linux_issue.cmake  LLVMConfigVersion.cmake   pkg.cmake
AddLLVMDefinitions.cmake  GetSVN.cmake             LLVM-Config.cmake  LLVMParseArguments.cmake  TableGen.cmake
arch.cmake                HandleLLVMOptions.cmake  LLVMConfig.cmake   LLVMProcessSources.cmake

因此,所有必需的cmake模块都在那里 - 就在系统上!

我很感激有关如何使用已经安装的LLVM 3.4 + 3.4 强制clang构建3.4 的提示.cmakecompiler-rt

更新:

我决定做以下事情:

$ llvm/clang3.4/_tars/clang-3.4/build$ cmake -DCLANG_PATH_TO_LLVM_BUILD="/usr" ..
-- Building with -fPIC
-- Clang version: 3.4
-- Found Subversion: /usr/bin/svn (found version "1.6.17") 
-- Configuring done
-- Generating done
-- Build files have been written to: ../llvm/clang3.4/_tars/clang-3.4/build
../llvm/clang3.4/_tars/clang-3.4/build$ make -j 2
Scanning dependencies of target ClangDriverOptions
Scanning dependencies of target clang-tblgen
[  0%] Building Options.inc...
[  0%] ../llvm/clang3.4/_tars/clang-3.4/include/clang/Driver/Options.td:15:9: error: Could not find include file 'llvm/Option/OptParser.td'
include "llvm/Option/OptParser.td"
        ^
.../llvm/clang3.4/_tars/clang-3.4/include/clang/Driver/Options.td:15:9: Building CXX object utils/TableGen/CMakeFiles/clang-tblgen.dir/ClangASTNodesEmitter.cpp.o
error: Unexpected input at top level
include "llvm/Option/OptParser.td"
        ^
make[2]: *** [include/clang/Driver/Options.inc.tmp] Error 1
make[1]: *** [include/clang/Driver/CMakeFiles/ClangDriverOptions.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs....
[  0%] Building CXX object utils/TableGen/CMakeFiles/clang-tblgen.dir/ClangAttrEmitter.cpp.o
[  0%] Building CXX object utils/TableGen/CMakeFiles/clang-tblgen.dir/ClangCommentCommandInfoEmitter.cpp.o
[  0%] Building CXX object utils/TableGen/CMakeFiles/clang-tblgen.dir/ClangCommentHTMLNamedCharacterReferenceEmitter.cpp.o
[  1%] Building CXX object utils/TableGen/CMakeFiles/clang-tblgen.dir/ClangCommentHTMLTagsEmitter.cpp.o
[  1%] Building CXX object utils/TableGen/CMakeFiles/clang-tblgen.dir/ClangDiagnosticsEmitter.cpp.o
[  1%] Building CXX object utils/TableGen/CMakeFiles/clang-tblgen.dir/ClangSACheckersEmitter.cpp.o
[  1%] Building CXX object utils/TableGen/CMakeFiles/clang-tblgen.dir/NeonEmitter.cpp.o
[  1%] Building CXX object utils/TableGen/CMakeFiles/clang-tblgen.dir/TableGen.cpp.o
Linking CXX executable ../llvm/clang3.4/_tars/llvm-3.4/build/bin/clang-tblgen
[  1%] Built target clang-tblgen
make: *** [all] Error 2

那更好.看起来clang3.4的默认值CMakeLists.txt甚至不是QA-ed x-(Yikes x-(

Answer 1

我决定像任何有自尊的工程师一样坚持下去:)我只是简单地查看了以下两个文件并添加了有问题的包含的完整路径，然后就是这样 。

1. Options.td
2. CC1AsOptions.td

现在我可以构建所有所需的 LLVM 主项目而无需libstdc++依赖，所有项目都与libc++和链接libc++abi。万岁:)

所以，我已经确认了

• 入门：构建和运行 Clang中给出的一些说明具有误导性，例如7。
• 所有主要的 LLVM 项目（除了compiler-rtAFAIK）都可以使用cmake. 无需将它们放在 LLVM 源代码树下进行构建。您绝对可以在 Linux 上单独构建几乎所有这些，这与这些“官方”文档可能会让您相信的不同：>

LLVM 团队应该认真思考并尽量减少所有项目之间明显的循环依赖。从我的第一手经验来看，在不依赖GNU 的情况下在各种 Linux 发行版（尤其是较旧的发行版，如 RHEL 5.x）上引导 LLVM/clang太乏味了。libstdc++他们可以做到（我已经做到了:)，但这不适合胆小的人。