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Macでgem installでunknown argument: '-multiply_definedsuppress'のエラー時の対応

Posted at

Apple LLVM 5.1 の clang になってから、gem installすると

clang: error: unknown argument: '-multiply_definedsuppress' [-Wunused-command-line-argument-hard-error-in-future]

なエラーになる。
回避策としては、

ARCHFLAGS=-Wno-error=unused-command-line-argument-hard-error-in-future gem install XXX

としてやるとインストール可能。

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