OS X 10.13.3 exposes bad fork() issue
还没有人认领这个 Issue。
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调研方向
首先，在 OS X 10.13.3 上分别在设置和未设置 OBJC_DISABLE_INITIALIZE_FORK_SAFETY=YES 的情况下，复现 require 'vips' 处的失败。跟踪确定 fork 失败属于 ruby-vips、ffi 还是 libvips；完成的标准是识别出负责的组件，并提供安全修复或有文档记录的 workaround。
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描述
After updating to OS X 10.13.3, I received the following error trying to require 'vips':
objc[25602]: +[__NSCFConstantString initialize] may have been in progress in another thread when fork() was called.
objc[25602]: +[__NSCFConstantString initialize] may have been in progress in another thread when fork() was called. We cannot safely call it or ignore it in the fork() child process. Crashing instead. Set a breakpoint on objc_initializeAfterForkError to debug.
Some googling took me to this post, which explains that the error comes from “incorrect code that happened to work most of the time in the past.” I have no way of knowing whether the issue is in ruby-vips or ffior libvips itself, and I don't really have the time or knowledge to track it down. Using one of that page's suggested workarounds – setting OBJC_DISABLE_INITIALIZE_FORK_SAFETY=YES in the environment – allowed me to load ruby-vips without issue and get on with my work, though I realize I'm just asking OS X to hang later if it encounters a deadlock instead of crashing the process now.
I'm reporting it here so there's both an issue to track and a concise explanation and workaround for anyone else who happens to google this error in a vips context.
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