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Use SDKROOT when set.

Hi, I suspect that picking `SDKROOT` unconditionally from env has set a wrong `sdk_path` for cc when targeting `{x86_64,aarch64}-apple-ios`. Could you please take a look into it? The bump that...

Use SDKROOT when set.

> when targeting ios you should set the SDKROOT to the ios sdk and not the host sdk. if you don't set the SDKROOT it should pick it up automatically....

I looked deeper into the ci workflow and found that `SDKROOT` might be set here: https://github.com/rust-lang/rust/blob/f3d597b31c0f101a02c230798afa31a36bdacbc6/src/ci/scripts/install-clang.sh#L30-L35 It used a value returned by `xcrun` and I think that's clearly wrong since...

Use SDKROOT when set.

> So set it correctly or don't... fyi, I found something here: rust-lang/cargo#7283 resolved by rust-lang/rust#64254 Maybe `SDKROOT` is just wrong in some situation when cross building? tbh I'm not...

Use SDKROOT when set.

> > Maybe SDKROOT is just wrong in some situation when cross building? > > No, it shouldn't be wrong when compiling for the target. All the links you mention...

根据「OI Wiki 不是什么」征集需要修改的页面列表

> 记录一下 #5053 提到的 > > 其中有用的分布，可以在讲解概率的页面提一提。 > > 比如，如何生成(0,1)均匀分布的浮点数，如果只用旧版本的C写（而不是C++11附带的东西）会变得出奇困难。简单提一下常见分布的简便写法也是有用的。应当注意本 Issue 是 "征集需要修改的页面", 对已经修改合规的页面/实际修改的意见应当另起一个话题而不是在这里 off-topic

feat(docs/lang/python.md): 新增Python性能优化、递归限制的说明

这一部分内容和 OI 的关系可能有点过小了? 首先 OI 根本不能用 Python 答题, 其次如果是打表的话, 如果是性能敏感的打表那么从一开始就写 C++ 大概率能跑出更多数据. 再次如果是作为脚本跑对拍的话, 作为一个胶水语言并不需要关心它的实际性能. 以及 [OI Wiki 不是编程语言文档](https://oi.wiki/intro/what-oi-wiki-is-not/#oi-wiki-%E4%B8%8D%E6%98%AF%E7%BC%96%E7%A8%8B%E8%AF%AD%E8%A8%80%E7%9A%84%E6%96%87%E6%A1%A3%E5%92%8C%E5%AD%A6%E4%B9%A0%E6%8C%87%E5%8D%97)