如何为LLVM指定自定义stdlib目录 [英] How to specify a custom stdlib directory for LLVM

问题描述

我有带有Clang的LLVM 3.3，并且

  $/tmp/clang/bin/clang -print-search-dirs程序:=/tmp/clang/bin:/usr/lib/gcc/i486-linux-gnu/4.4/../../../../i486-linux-gnu/bin库:=/tmp/clang/bin/../lib/clang/3.3:/usr/lib/gcc/i486-linux-gnu/4.4:/usr/lib/gcc/i486-linux-gnu/4.4/../../../../lib32:/usr/lib/../lib32:/usr/lib/i486-linux-gnu/../../lib32:/usr/lib/gcc/i486-linux-gnu/4.4/../../..:/lib:/usr/lib 

如何指示Clang使用除/usr/lib/gcc/i486-linux-gnu/4.4 以外的stdlib(例如 libgcc )目录?我想改为使用/tmp/mygccstd .

它也在寻找/usr/lib 和/lib .如何禁用它?

解决方案

-B 和-sysroot 的组合解决了这些问题. -nostdinc ， -isystem 和 -cxx-isystem 的组合完成了包含的技巧.并非所有这些标志都由 clang --help 显示，其中一些是我从 man gcc 中学到的，其他一些是阅读Clang源代码的，而另一些在线的.>

-gcc-toolchain 也有所不同，但是它使用怪异的规则来查找库，不允许在路径名组件中使用符号链接等，因此我最终改用了上面的其他标志.

I have LLVM 3.3 with Clang, and

$ /tmp/clang/bin/clang -print-search-dirs
programs: =/tmp/clang/bin:/usr/lib/gcc/i486-linux-gnu/4.4/../../../../i486-linux-gnu/bin
libraries: =/tmp/clang/bin/../lib/clang/3.3:/usr/lib/gcc/i486-linux-gnu/4.4:/usr/lib/gcc/i486-linux-gnu/4.4/../../../../lib32:/usr/lib/../lib32:/usr/lib/i486-linux-gnu/../../lib32:/usr/lib/gcc/i486-linux-gnu/4.4/../../..:/lib:/usr/lib

How can I instruct Clang to usage an stdlib (e.g. libgcc) directory other than /usr/lib/gcc/i486-linux-gnu/4.4? I'd like to make it use /tmp/mygccstd instead.

It's also looking in /usr/lib and /lib. How do I disable that?

解决方案

A combination of -B and --sysroot did the trick for the libraries. A combination of -nostdinc, -isystem and -cxx-isystem did the trick for the includes. Not all these flags are displayed by clang --help, some of them I learned from man gcc, some other reading the Clang source code, and some other online.

-gcc-toolchain also made a difference, but it was using weird rules to find the libraries, disallowing symlinks in the pathname components etc., so I ended up using the other flags above instead.

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