Xcode 5.1のリリースからこんな感じらしい
macでbundle installしたら以下のエラーが出た
...
Gem::Installer::ExtensionBuildError: ERROR: Failed to build gem native extension.
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/bin/ruby extconf.rb
checking for ruby/util.h... yes
creating Makefile
make "DESTDIR="
compiling bcrypt_ext.c
compiling crypt.c
compiling crypt_blowfish.c
compiling crypt_gensalt.c
compiling wrapper.c
linking shared-object bcrypt_ext.bundle
clang: error: unknown argument: '-multiply_definedsuppress' [-Wunused-command-line-argument-hard-error-in-future]
clang: note: this will be a hard error (cannot be downgraded to a warning) in the future
make: *** [bcrypt_ext.bundle] Error 1
Gem files will remain installed in /path/to/rails/vendor/bundle/ruby/2.0.0/gems/bcrypt-3.1.7 for inspection.
Results logged to /path/to/rails/vendor/bundle/ruby/2.0.0/gems/bcrypt-3.1.7/ext/mri/gem_make.out
An error occurred while installing bcrypt (3.1.7), and Bundler cannot continue.
Make sure that `gem install bcrypt -v '3.1.7'` succeeds before bundling.
エラーをみたところによるとclang によるビルドエラーらしい
Xcode Release Notes
で、解決方法もここに書いてあるけど、ARCHFLAGSの環境変数を設定しつつ、bcryptをインストールしてみたらうまくいった
$ sudo ARCHFLAGS=-Wno-error=unused-command-line-argument-hard-error-in-future bundle install --path vendor/bundle
とかやって、再度bundle installしたらいけた
