ruby-on-rails - 在 Windows 上为 "libv8"安装 "therubyracer"gem

Question

我在 Windows 上安装 therubyracer gem 时遇到问题。

使用 Ruby 2.1.6 32 位 并运行

gem install libv8 -v '3.16.14.3' -- --with-system-v8

这是我得到的错误:

Installing therubyracer 0.12.1 with native extensions

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

    C:/Ruby21/bin/ruby.exe extconf.rb
checking for main() in -lpthread... no
checking for v8.h... no
*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of necessary
libraries and/or headers.  Check the mkmf.log file for more details.  You may
need configuration options.

Provided configuration options:
        --with-opt-dir
        --without-opt-dir
        --with-opt-include
        --without-opt-include=${opt-dir}/include
        --with-opt-lib
        --without-opt-lib=${opt-dir}/lib
        --with-make-prog
        --without-make-prog
        --srcdir=.
        --curdir
        --ruby=C:/Ruby21/bin/ruby
        --with-pthreadlib
        --without-pthreadlib
        --enable-debug
        --disable-debug
        --with-v8-dir
        --without-v8-dir
        --with-v8-include
        --without-v8-include=${v8-dir}/include
        --with-v8-lib
        --without-v8-lib=${v8-dir}/lib
C:/Ruby21/lib/ruby/gems/2.1.0/gems/libv8-3.16.14.3/ext/libv8/location.rb:50:in 
`configure': You have chosen to use the version of V8 found on your system (Libv8::Location::System::NotFoundError)
and *not* the one that is bundle with the libv8 rubygem. However,
it could not be located. please make sure you have a version of
v8 that is compatible with 3.16.14.3 installed. You may
need to special --with-v8-dir options if it is in a non-standard
location

thanks,
The Mgmt

        from C:/Ruby21/lib/ruby/gems/2.1.0/gems/libv8-3.16.14.3/lib/libv8.rb:7:in `configure_makefile'
        from extconf.rb:32:in `<main>'

extconf failed, exit code 1

Gem files will remain installed in C:/Ruby21/lib/ruby/gems/2.1.0/gems/therubyracer-0.12.1 for inspection.
Results logged to C:/Ruby21/lib/ruby/gems/2.1.0/extensions/x86-mingw32/2.1.0/therubyracer-0.12.1/gem_make.out
An error occurred while installing therubyracer (0.12.1), and Bundler cannot continue.
Make sure that `gem install therubyracer -v '0.12.1'` succeeds before bundling.

Answer 1

这是一把双刃剑，libv8 gem 本身试图构建 v8 而事情变得疯狂，因为它正在使用 *nix 程序测试和设置环境。

所以要修复它，您必须使用 -- --with-system-v8 这样它就不会尝试构建 v8。不幸的是，该建议已经假定您在系统某处拥有 v8 的副本。显然你不知道。

快速简便的方法是安装 node.js并确保将其添加到您的路径中，因为它是静态编译的，库位于 node.exe 中。 这种方法可能会出现一些奇怪的错误，但我认为您不会遇到任何错误。

当然，实际上您不需要 therubyracer 或 libv8，因为 Windows 附带了 JScript，它本身就是一个 JavaScript 引擎，或者如果没有别的，node 也足够了。