尝试使用“ gem install therubyracer -v'0.10.2'”在特立独行上安装therubyracer，但出现以下错误：

/Users/dennischen/.rvm/rubies/ruby-1.9.3-p194/bin/ruby extconf.rb
checking for main() in -lobjc... yes
creating Makefile

make
compiling rr.cpp
clang: warning: argument unused during compilation: '-rdynamic'
rr.cpp:48:1: warning: control reaches end of non-void function [-Wreturn-type]
}
^
1 warning generated.
compiling v8.cpp
clang: warning: argument unused during compilation: '-rdynamic'
compiling v8_array.cpp
clang: warning: argument unused during compilation: '-rdynamic'
compiling v8_callbacks.cpp
clang: warning: argument unused during compilation: '-rdynamic'
compiling v8_context.cpp
clang: warning: argument unused during compilation: '-rdynamic'
compiling v8_date.cpp
clang: warning: argument unused during compilation: '-rdynamic'
compiling v8_debug.cpp
clang: warning: argument unused during compilation: '-rdynamic'
compiling v8_exception.cpp
clang: warning: argument unused during compilation: '-rdynamic'
v8_exception.cpp:10:16: warning: unused variable 'stack' [-Wunused-variable]
  static void* stack[20];
               ^
1 warning generated.
compiling v8_external.cpp
clang: warning: argument unused during compilation: '-rdynamic'
v8_external.cpp:10:9: warning: unused variable 'references' [-Wunused-variable]
  VALUE references;
        ^
1 warning generated.
compiling v8_function.cpp
clang: warning: argument unused during compilation: '-rdynamic'
compiling v8_handle.cpp
clang: warning: argument unused during compilation: '-rdynamic'
compiling v8_locker.cpp
clang: warning: argument unused during compilation: '-rdynamic'
v8_locker.cpp:45:5: warning: control reaches end of non-void function [-Wreturn-type]
    }
    ^
v8_locker.cpp:85:5: warning: control reaches end of non-void function [-Wreturn-type]
    }
    ^
2 warnings generated.
compiling v8_message.cpp
clang: warning: argument unused during compilation: '-rdynamic'
compiling v8_object.cpp
clang: warning: argument unused during compilation: '-rdynamic'
v8_object.cpp:77:19: warning: unused variable 'proto' [-Wunused-variable]
    Handle<Value> proto(rr_rb2v8(prototype));
                  ^
1 warning generated.
compiling v8_script.cpp
clang: warning: argument unused during compilation: '-rdynamic'
compiling v8_string.cpp
clang: warning: argument unused during compilation: '-rdynamic'
compiling v8_template.cpp
clang: warning: argument unused during compilation: '-rdynamic'
compiling v8_try_catch.cpp
clang: warning: argument unused during compilation: '-rdynamic'
compiling v8_v8.cpp
clang: warning: argument unused during compilation: '-rdynamic'
compiling v8_value.cpp
clang: warning: argument unused during compilation: '-rdynamic'
v8_value.cpp:100:9: warning: unused function 'ToInt32' [-Wunused-function]
  VALUE ToInt32(VALUE self) {
        ^
1 warning generated.
compiling v8_weakref.cpp
clang: warning: argument unused during compilation: '-rdynamic'
linking shared-object v8.bundle
clang: error: no such file or directory: '/Users/dennischen/.rvm/gems/ruby-1.9.3-p194@panini/gems/libv8-3.3.10.4/lib/libv8/build/v8/libv8.a'
make: *** [v8.bundle] Error 1

谁能帮我弄清楚如何使这种宝石起作用？我已经安装了命令行工具。

如果您决定使用较新的therubyracergem版本，则将不再有此问题

除此以外：

brew tap homebrew/dupes # Thanks Tom
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

brew uninstall v8

gem uninstall libv8

gem install therubyracer -v '0.10.2' # specify version

因此，经过一番苦苦挣扎，我终于让它开始工作了……多亏了Simon和Alvaro。

我要添加的一件事是，使用--with-system-v8标志对我不起作用...所以我用

brew uninstall v8

和运行

gem install libv8

如果您已经gem install libv8使用system v8标志运行，请确保卸载该gem版本（通过运行来进行安装gem uninstall libv8）。重要的是，您不应该使用brew提供的程序，它在Mavericks中似乎不起作用（安装正确，bundler将报告您的程序包已完成，但是当您尝试使用v8时，您的应用程序将失败）。

总结答案，请执行以下操作：

brew install apple-gcc42
sudo ln -s /usr/local/Cellar/apple-gcc42/4.2.1-5666.3/bin/gcc-4.2 /usr/bin/gcc
sudo ln -s /usr/local/Cellar/apple-gcc42/4.2.1-5666.3/bin/g++-4.2 /usr/bin/g++
sudo ln -s /usr/local/Cellar/apple-gcc42/4.2.1-5666.3/bin/cpp-4.2 /usr/bin/cpp

brew uninstall v8
gem install libv8
gem install therubyracer

我有同样的问题，这对我有用：

therubyracer（0.10.2）和libv8（3.3.10.4）

首先：

• brew install apple-gcc42
• 必须链接编译器的所有二进制文件（gcc，cpp，g++），以/usr/local/Cellar/apple-gcc42/4.2.1-5666.3/bin/<compiler>

之后，您可以尝试以下操作：

• brew install v8
• gem install libv8 -v '3.3.10.4' -- --with-system-v8
• gem install therubyracer -v 'therubyracer'或bundle install进入rails项目的目录。

我只是有同样的问题，一种解决方案是当前使用apple-gcc42而不是clang来编译两个gems：

brew install apple-gcc42

然后，您可以选择在/ usr / bin中为{gcc，g ++，c ++}二进制文件进行一些符号链接：

sudo ln -s /usr/local/Cellar/apple-gcc42/4.2.1-5666.3/bin/gcc-4.2 /usr/bin/gcc
sudo ln -s /usr/local/Cellar/apple-gcc42/4.2.1-5666.3/bin/g++-4.2 /usr/bin/g++
sudo ln -s /usr/local/Cellar/apple-gcc42/4.2.1-5666.3/bin/cpp-4.2 /usr/bin/cpp

实际上，g ++应该足够了。

或者...您可以导出CC / CXX / CPP环境变量，其路径对应于自制软件创建的二进制文件。这肯定是一种更清洁的解决方法。

第三种解决方案是下载Xcode 4.6.3并将其安装在Applications文件夹中。然后，在终端中输入：

sudo xcode-select --switch /Applications/Xcode4.6.3.app/Contents/Developer
gem install therubyracer

一旦安装了gem，就可以切换回Xcode 5.0：

sudo xcode-select --switch /Applications/Xcode.app/Contents/Developer

我发现了一种无需安装apple-gcc42的解决方法。

如果您收到的错误消息如下所示，这将起作用：

clang: error: no such file or directory: '/Users/mscottford/.rbenv/versions/1.9.3-p327/lib/ruby/gems/1.9.1/gems/libv8-3.3.10.4/lib/libv8/build/v8/libv8.a'

然后，您应该能够执行以下操作：

brew install v8
bundle install 
# after failing create link from brew installed v8 to error location
ln -s /usr/local/Cellar/v8/3.21.17/lib/libv8_base.x64.a /Users/mscottford/.rbenv/versions/1.9.3-p327/lib/ruby/gems/1.9.1/gems/libv8-3.3.10.4/lib/libv8/build/v8/libv8.a
bundle install

资料来源：https : //github.com/cowboyd/therubyracer/issues/277#issuecomment-27734348

正如许多答案所建议的那样，最简单的方法是使用Apple GCC 4.2（而不是随Xcode安装的版本）编译Ruby Racer本机扩展。

如果您使用的是MacPorts，则无需手动处理为GCC二进制文件设置符号链接的过程。该port select命令为您完成。如果自安装Mavericks以来尚未更新MacPorts，请执行sudo port selfupdate。使用最新的MacPorts，请尝试以下操作：

# If you don't have it, install the port for Apple's GCC 4.2
sudo port install apple-gcc42 

    # OR

# If you had apple-gcc42 already (before Mavericks), update it
sudo port upgrade apple-gcc42


# Same result as manual symlinking of GCC in other answers
sudo port select gcc apple-gcc42 && hash -r

# Install therubyracer, will install libv8 gem dependency
#  *note* if you have any existing versions of these gems, remove them
gem install therubyracer

# Restore GCC to system default (optional)
sudo port select gcc none && hash -r

通常，sudo port select gcc [version]只要您要使用特定的GCC版本而不是Xcode安装的版本（Apple LLVM v5 for 10.9 Mavericks / Xcode 5），此过程（）便可以使用。

我设法在ruby 2.0.0p353和os x 10.9上安装therubyracer 0.12和libv8 3.16.14.3

libv8需要gcc42

brew install v8
brew install apple-gcc42
sudo ln -sf /usr/local/Cellar/apple-gcc42/4.2.1-5666.3/bin/gcc-4.2 /usr/bin/gcc
sudo ln -sf /usr/local/Cellar/apple-gcc42/4.2.1-5666.3/bin/g++-4.2 /usr/bin/g++
sudo ln -sf /usr/local/Cellar/apple-gcc42/4.2.1-5666.3/bin/cpp-4.2 /usr/bin/cpp
gem install libv8

therubyracer需要稍后的gcc

brew install gcc49
sudo ln -sf /usr/local/Cellar/gcc49/4.9-20131110/bin/gcc-4.9 /usr/bin/gcc
sudo ln -sf /usr/local/Cellar/gcc49/4.9-20131110/bin/g++-4.9 /usr/bin/g++
sudo ln -sf /usr/local/Cellar/gcc49/4.9-20131110/bin/cpp-4.9 /usr/bin/cpp

宝石文件

gem 'therubyracer', :require => 'v8', :platforms => :ruby

用bundle代替gem install therubyracer

这应该是一种故障安全且干净的方法（没有符号链接），以便为有问题的任何人安装therubyracer。

摘自：gem install therubyracer -v 0.11.4在OS X 10.10上失败

安装Xcode（如果您尚未安装这些版本之一）6.1.1、6.2-beta或6.3-beta和（需要此版本）4.6.3

gem uninstall libv8 如果您还没有这样做的话

切换到Xcode 4.6.3

sudo xcode-select --switch /Applications/Xcode4.6.3.app/Contents/Developer

gem install libv8 -v '3.11.8.17' 或与您的therubyracer版本相关的任何版本

切换到Xcode 6.1.1、6.2-beta或6.3-beta（或者，如果您想尝试当前安装的Xcode，请调整此行，我已经确认了所有这三项工作）

sudo xcode-select --switch /Applications/Xcode6.1.1.app/Contents/Developer

gem install therubyracer -v '0.11.4' 或您要安装的版本。

尝试安装therubyracer 0.12.0使其与libv8配合使用时，我遇到了几乎相同的错误。这对我有用：

$ brew upgrade gcc

$ gem uninstall therubyracer

$ gem uninstall libv8

$ gem install therubyracer -v '0.12.0'
Fetching: therubyracer-0.12.0.gem (100%)
Building native extensions.  This could take a while...
Successfully installed therubyracer-0.12.0
1 gem installed

$ gem install libv8 -v '3.16.14.3' -- --with-system-v8
Fetching: libv8-3.16.14.3.gem (100%)
Building native extensions with: '--with-system-v8'
This could take a while...
Successfully installed libv8-3.16.14.3
1 gem installed

从OSX Mountain Lion升级到OSX Mavericks时，我遇到了同样的问题。

从ruby-1.8.7-p354升级到ruby-1.8.7-375对我有用。

也许尝试从ruby 1.9.3-p194升级到rc1（1.9.3现在高于p484）

假设您使用rbenv：

rbenv install 1.9.3-rc1
rbenv rehash
rbenv global 1.9.3-rc1
bundle install

从小牛升级到优胜美地后，我遇到了这个问题。问题是我用旧版本的OSX编译了Ruby版本。

如果我跑了

ruby -rubygems -e 'puts Gem::Platform.new(RUBY_PLATFORM)'

我会x86_64-darwin-13代替x86_64-darwin-14优胜美地。

重新安装Ruby I

1. 完全删除旧版本： rvm remove ruby-2.1.1
2. 从源代码重新安装（--disable-binary不使用预编译的二进制文件，而是强制构建）： rvm reinstall --disable-binary 2.1

然后bundle install，在尝试了上述所有解决方案之后，我能够毫无错误地运行。

我所做的就是在osx特立独行者身上：

git clone git@github.com:cowboyd/therubyracer.git

然后：

gem build therubyracer.gemspec
gem install therubyracer-0.12.1.gem

此过程下载并安装了libv8的二进制版本。