Cython编译错误：'-mno-fused-madd' [英] Cython compilation errors: '-mno-fused-madd'

问题描述

每当我编译Cython代码（使用 pyximport ）和频繁地从源代码安装软件包（ pip ）我得到

Whenever I compile Cython code (using pyximport) and frequently when I install packages from source (with pip) I get

clang: warning: argument unused during compilation: '-mno-fused-madd'

这个警告是什么，我能做些什么来防止它？我怀疑我可能无法防止当 pip 触发它，但是至少有一些方法配置 pyximport 以避免它？

What is this warning and what can I do to prevent it? I suspect I may not be able to prevent when pip triggers it, but is thre at least some way to configure pyximport to avoid it?

OS X 10.9，Python 2.7.5，Xcode clang 500.2.79

OS X 10.9, Python 2.7.5, Xcode clang 500.2.79

推荐答案

-mno-fused-madd 是gcc cpu目标选项。它用于启用/禁用生成融合乘法/加法指令（FMAC，通用于DSP）。

-mno-fused-madd is a gcc cpu target option. It is for enabling/disabling the generation of the fused multiply/add instructions (FMACs. Common in DSPs).

由于这是gcc特定的，clang给出一个警告，它不明白该选项。

Since this is gcc-specific, clang gives a warning that it doesn't understand the option.

如果你真的不想看到这个警告，你可以尝试设置默认编译器

If you really don't want to see this warning you could try setting the default compiler by

env CC=/usr/bin/gcc pip install ...

这也应该适用于pyximport（但我还没有试过）。

This should also work for pyximport too (But I haven't tried).

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