[ruby] require 'v8eval' raises LoadError; native extension build error

[ktimothy]

code:

require 'v8eval'

exception:

/home/vagrant/.rbenv/versions/2.1.2/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in `require': cannot load such file -- v8eval/v8eval (LoadError)
    from /home/vagrant/.rbenv/versions/2.1.2/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:55:in `require'
    from /home/vagrant/.rbenv/versions/2.1.2/lib/ruby/gems/2.1.0/gems/v8eval-0.2.1/ruby/lib/v8eval.rb:2:in `<top (required)>'
    from /home/vagrant/.rbenv/versions/2.1.2/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:135:in `require'
    from /home/vagrant/.rbenv/versions/2.1.2/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:135:in `rescue in require'
    from /home/vagrant/.rbenv/versions/2.1.2/lib/ruby/2.1.0/rubygems/core_ext/kernel_require.rb:144:in `require'

[ktimothy]

Oh, I look like something was wrong with the installation. Now I get an error:

compiling v8eval_wrap.cxx
cc1plus: error: unrecognized command line option '-std=c++11'
make: *** [v8eval_wrap.o] Error 1

make failed, exit code 2

I guess I have wrong version of g++ or something else... Any ideas?

[ktimothy]

I have solved the problem: I had g++ compiler 4.6 while v8 (or swig or whatever else) needed 4.8 to build.

I think it is good to add to README that g++ 4.8 is needed.

[YoshiyukiMineo]

Hi

What is your platform?

v8eval supports Mac and Linux.
v8eval/build.sh uses clang that is the default compiler in Mac
or uses clang that is fetched together with V8 in Linux.

See https://github.com/sony/v8eval/blob/master/build.sh#L5-L20

[ktimothy]

Hi, I use Ubuntu 12.04.5 LTS.

[YoshiyukiMineo]

I think v8eval don't set the compiler correctly in 'gem install'.
We will fix the bug.

[YoshiyukiMineo]

We have fixed this issue. Thank you for your feedback.