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GCC is essentially broken, rendering compilation of standard packages impossible.

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61407

Our team was on Yosemite but we all had to move back to Mavericks to actually do work.

brew (which I'd consider on OS X to be `standard packages`) generally uses LLVM rather than GCC, and has been fine throughout 10.10

Correct... but many ruby gems and node.js modules compile using gcc. (v8 being the most annoying one for us)

are you sure it's actually gcc and not clang, because "gcc" on OS X is clang

It's doing gcc 4.2, and when you try to install / compile a higher version it fails. Pretty sure.

I've had luck installing most Ruby gems used by my projects. The only exception so far has been Nokogiri, and even in that case there were instructions on the project's web page that got it to install without a hitch.

As you mentioned, there are still a handful that currently have GCC issues, namely Haskell (GHC) and MongoDB.

https://github.com/Homebrew/homebrew/issues/29845

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