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Apple used GCC for more than a decade. It wasn’t until LLVM came along that they had a viable choice and they took it.

• bonzini 6y ago
  Until the GPLv3 came along, really. Apple kept contributing to GCC until 4.2.
• jhgb 6y ago
  I know they used it. And I'm really glad for GCC's sake that they took that choice.