El Capitan libv8がインストール出来ない

OSX 10.11 El Capitanにアップグレードした際に、Ruby on Railsの環境構築で失敗したので個人的なメモ。

bundle installで失敗したgem

• libv8
• therubyracer

libv8のエラー

こんな感じのエラーが出た

Gem::Ext::BuildError: ERROR: Failed to build gem native extension.

    /usr/local/var/rbenv/versions/2.1.7/bin/ruby extconf.rb
creating Makefile
Compiling v8 for x64
Using python 2.7.10
Using compiler: /usr/bin/c++ (clang version 7.0.0)
In file included from ../src/conversions.cc:32:
In file included from ../src/conversions-inl.h:43:
../src/scanner.h:444:5: error: unused typedef '__StaticAssertTypedef__444' [-Werror,-Wunused-local-typedef]
    STATIC_ASSERT(kCharacterLookaheadBufferSize == 1);
    ^
../src/checks.h:283:30: note: expanded from macro 'STATIC_ASSERT'
#define STATIC_ASSERT(test)  STATIC_CHECK(test)
                             ^
../src/checks.h:251:5: note: expanded from macro 'STATIC_CHECK'
    SEMI_STATIC_JOIN(__StaticAssertTypedef__, __LINE__)
    ^
../src/checks.h:240:32: note: expanded from macro 'SEMI_STATIC_JOIN'
#define SEMI_STATIC_JOIN(a, b) SEMI_STATIC_JOIN_HELPER(a, b)
                               ^
../src/checks.h:241:39: note: expanded from macro 'SEMI_STATIC_JOIN_HELPER'
#define SEMI_STATIC_JOIN_HELPER(a, b) a##b
                                      ^
<scratch space>:63:1: note: expanded from here
__StaticAssertTypedef__444

...

apple-gcc42のインストール

apple-gcc42をインストールすることで回避できた。

$ brew tap homebrew/dupes
$ brew install apple-gcc42

$ export CC=/usr/local/Cellar/apple-gcc42/4.2.1-5666.3/bin/gcc-4.2
$ export CXX=/usr/local/Cellar/apple-gcc42/4.2.1-5666.3/bin/g++-4.2
$ export CPP=/usr/local/Cellar/apple-gcc42/4.2.1-5666.3/bin/cpp-4.2

$ gem install therubyracer

インストールされたgemのバージョン

$ gem list --local

libv8 (3.16.14.11 x86_64-darwin-15)
therubyracer (0.12.2)

あとはいつも通り、bundle installすればOK

参考