什么时候从源代码构建Clang时需要libc ++源？ [英] When is libc++ sources needed when building Clang from sources?

问题描述

在Linux和OS X上我一直在构建Clang多年。从 LLVM下载页，我一直使用以下来源：

• LLVM（LLVM源）




• 编译器工具（工具其他来源）

/ ul>



我使用下载，构建和安装Clang 3.5的食谱可以在 Clang 3.5下载，构建和安装脚本。





它在OS X 10.7和10.8上很好用，我从来不需要libc ++

问题：什么时候需要libc ++和什么时候需要libc ++？ libc ++ ABI源？




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我试图帮助解决无法编译一个简单的C ++Hello World OS X 10.9。 Clang 3.5安装在 / usr / local （就像其他），但是它没有找到标头（如< iostream> ）并且在链接期间遇到未定义的符号（例如std :: ostream :: operator<<（std :: ostream&（*）（std :: ostream& code>）。





我想知道10.7和10.8是否有标题和库，以前的版本的Clang期望，但10.9需要他们构建和安装。 / p>



问题：是缺少libc ++和libc ++ ABI的症状吗？

解决方案

在构建/安装clang时，应该检查libc ++源代码，以便安装C ++ STL。





在你的系统上有一个libc ++运行时，你应该检查并安装libc ++ abi和libc ++，它可以独立完成，并且独立于你的llvm / clang安装中的checkout。





作为参考，我建议你看看在MacPorts的libcxxabi，libcxx，libunwind和llvm-XY端口，显示我如何配置这些项目通过Yosemite在Leopard上构建。




I've been building Clang for years on Linux and OS X. From the LLVM Download page, I've always used the following sources:

• LLVM (LLVM source)
• Compiler Front End (Clang source)
• Compiler RT (Runtime source)
• Compiler Tools (Tools Extra sources)

The recipe I am using to download, build and install Clang 3.5 can be found at Clang 3.5 download, build and install script.

Its works great on OS X 10.7 and 10.8, and I've never needed the libc++ gear on OS X 10.7.x or 10.8.x (that's about 2010 or so through current).

Question: when does one need the libc++ and libc++ ABI sources?

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I'm trying to help troubleshoot the inability to compile a simple C++ "Hello World" program on OS X 10.9. Clang 3.5 installed in /usr/local (just like the others), but its failing to find headers (like <iostream>) and it encounters undefined symbols during link (like "std::ostream::operator<<(std::ostream& (*)(std::ostream&))").

I'm wondering if 10.7 and 10.8 had headers and libraries where previous versions of Clang expected, but 10.9 needs them built and installed.

Question: is this symptomatic of a missing libc++ and libc++ ABI?

解决方案

You should have the libc++ sources checked out when building/installing clang such that you will also install the C++ STL.

If you don't have a libc++ runtime on your system, you should checkout and install libc++abi and libc++ which can be done standalone and independently of their checkout in your llvm/clang install.

As reference, I suggest you take a look at the libcxxabi, libcxx, libunwind, and llvm-X.Y ports in MacPorts which show how I've configured these projects to build on Leopard through Yosemite.

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