Issue upgrading application to rails 4.2.1 with libv8 & devise & therubyracer -

my application working fine following gemfile:

source 'https://rubygems.org'   #ruby version ruby "2.1.5" # bundle edge rails instead: gem 'rails', github: 'rails/rails' gem 'rails', '4.1.10' # use sqlite3 database active record gem 'pg' # use scss stylesheets gem 'sass-rails', '~> 4.0.3' # use uglifier compressor javascript assets gem 'uglifier', '>= 1.3.0' # use coffeescript .js.coffee assets , views gem 'coffee-rails', '~> 4.0.0' # see https://github.com/sstephenson/execjs#readme more supported runtimes # gem 'therubyracer',  platforms: :ruby  # use jquery javascript library gem 'jquery-rails' gem 'jquery-ui-rails' # turbolinks makes following links in web application faster. read more: https://github.com/rails/turbolinks gem 'turbolinks' # build json apis ease. read more: https://github.com/rails/jbuilder gem 'jbuilder', '~> 2.0' # bundle exec rake doc:rails generates api under doc/api. gem 'sdoc', '~> 0.4.0',          group: :doc  #add bootstrap css gem "twitter-bootstrap-rails" gem "therubyracer" gem "less-rails"  # spring speeds development keeping application running in background. read more: https://github.com/rails/spring gem 'spring',        group: :development  #add paperclip image uploading - requires imagemagick - need rmagick heroku? gem "paperclip", :git => "git://github.com/thoughtbot/paperclip.git" gem 'rmagick' #aws-sdk s3 capability production gem 'aws-sdk', group: :production  gem "rake", '10.4.2'  #adding geoip our lookup location services gem 'geoip', '~> 1.4.0'  #adding exception notifier debugging on heroku gem 'exception_notification'  #annotate model game models details of database contents added comments top of files gem 'annotate', '~> 2.6.5'  #for oauth authentication stripe api gem 'omniauth-stripe-connect'  #for stripe checkout gem 'stripe', :git => 'https://github.com/stripe/stripe-ruby'  #for user management gem 'devise' #for devise facebook omni auth gem 'omniauth-facebook'  #for storing custom settings gem 'rails_config'  #httparty consuming external web services in ruby app - used gdistance class in services gem 'httparty'  #i need latest version of fontawesome - 1 in bootstrap old! gem "font-awesome-rails"  #google analytics - production gem 'rack-google_analytics', group: :production  #ahoy on site analytics - trying out gem 'ahoy_matey'  #using socialization gem user follows gem 'socialization'  # use activemodel has_secure_password # gem 'bcrypt', '~> 3.1.7'  # use unicorn app server # gem 'unicorn'  # use capistrano deployment # gem 'capistrano-rails', group: :development  # use debugger # gem 'debugger', group: [:development, :test] 

i want update application use rails 4.2.1, update line in gemfile:

gem 'rails', '4.2.1' 

when run bundle update following error:

using less 2.6.0 using less-rails 2.7.0 (was 2.6.0)  gem::ext::builderror: error: failed build gem native extension.      /users/andyarmstrong/.rbenv/versions/2.1.5/bin/ruby -r ./siteconf20150701-17291-17o68o1.rb extconf.rb  creating makefile compiling v8 x64 using python 2.7.6 using compiler: /usr/bin/c++ (clang version 6.1.0) /applications/xcode.app/contents/developer/toolchains/xcodedefault.xctoolchain/usr/bin/libtool: file: /users/andyarmstrong/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/libv8-3.16.14.8/vendor/v8/out/x64.release/obj.target/preparser_lib/src/atomicops_internals_x86_gcc.o has no symbols in file included ../src/accessors.cc:28: in file included ../src/v8.h:60: in file included ../src/objects-inl.h:38: in file included ../src/elements.h:33: in file included ../src/heap.h:35: in file included ../src/incremental-marking.h:33: in file included ../src/mark-compact.h:32: ../src/spaces.h:896:26: error: 'this' pointer cannot null in well-defined c++ code; comparison may assumed evaluate true [-werror,-wtautological-undefined-compare]   bool exists() { return != null && code_range_ != null; }                          ^~~~    ~~~~ ../src/spaces.h:898:9: error: 'this' pointer cannot null in well-defined c++ code; comparison may assumed evaluate false [-werror,-wtautological-undefined-compare]     if (this == null || code_range_ == null) return false;         ^~~~    ~~~~ 2 errors generated. make[1]: *** [/users/andyarmstrong/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/libv8-3.16.14.8/vendor/v8/out/x64.release/obj.target/v8_base/src/accessors.o] error 1 make: *** [x64.release] error 2 /users/andyarmstrong/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/libv8-3.16.14.8/ext/libv8/location.rb:36:in `block in verify_installation!': libv8 did not install properly, expected binary v8 archive '/users/andyarmstrong/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/libv8-3.16.14.8/vendor/v8/out/x64.release/obj.target/tools/gyp/libv8_base.a'to exist, not found (libv8::location::vendor::archivenotfound)     /users/andyarmstrong/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/libv8-3.16.14.8/ext/libv8/location.rb:35:in `each'     /users/andyarmstrong/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/libv8-3.16.14.8/ext/libv8/location.rb:35:in `verify_installation!'     /users/andyarmstrong/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/libv8-3.16.14.8/ext/libv8/location.rb:26:in `install!'     extconf.rb:7:in `<main>' gyp_generators=make \     build/gyp/gyp --generator-output="out" build/all.gyp \                   -ibuild/standalone.gypi --depth=. \                   -dv8_target_arch=x64 \                   -s.x64  -dv8_enable_backtrace=1 -dv8_can_use_vfp2_instructions=true -darm_fpu=vfpv2 -dv8_can_use_vfp3_instructions=true -darm_fpu=vfpv3 -dwerror=''   cxx(target) /users/andyarmstrong/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/libv8-3.16.14.8/vendor/v8/out/x64.release/obj.target/preparser_lib/src/allocation.o   cxx(target) /users/andyarmstrong/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/libv8-3.16.14.8/vendor/v8/out/x64.release/obj.target/preparser_lib/src/atomicops_internals_x86_gcc.o   cxx(target) /users/andyarmstrong/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/libv8-3.16.14.8/vendor/v8/out/x64.release/obj.target/preparser_lib/src/bignum.o   cxx(target) /users/andyarmstrong/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/libv8-3.16.14.8/vendor/v8/out/x64.release/obj.target/preparser_lib/src/bignum-dtoa.o   cxx(target) /users/andyarmstrong/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/libv8-3.16.14.8/vendor/v8/out/x64.release/obj.target/preparser_lib/src/cached-powers.o   cxx(target) /users/andyarmstrong/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/libv8-3.16.14.8/vendor/v8/out/x64.release/obj.target/preparser_lib/src/conversions.o   cxx(target) /users/andyarmstrong/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/libv8-3.16.14.8/vendor/v8/out/x64.release/obj.target/preparser_lib/src/diy-fp.o   cxx(target) /users/andyarmstrong/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/libv8-3.16.14.8/vendor/v8/out/x64.release/obj.target/preparser_lib/src/dtoa.o   cxx(target) /users/andyarmstrong/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/libv8-3.16.14.8/vendor/v8/out/x64.release/obj.target/preparser_lib/src/fast-dtoa.o   cxx(target) /users/andyarmstrong/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/libv8-3.16.14.8/vendor/v8/out/x64.release/obj.target/preparser_lib/src/fixed-dtoa.o   cxx(target) /users/andyarmstrong/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/libv8-3.16.14.8/vendor/v8/out/x64.release/obj.target/preparser_lib/src/once.o   cxx(target) /users/andyarmstrong/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/libv8-3.16.14.8/vendor/v8/out/x64.release/obj.target/preparser_lib/src/preparse-data.o   cxx(target) /users/andyarmstrong/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/libv8-3.16.14.8/vendor/v8/out/x64.release/obj.target/preparser_lib/src/preparser.o   cxx(target) /users/andyarmstrong/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/libv8-3.16.14.8/vendor/v8/out/x64.release/obj.target/preparser_lib/src/preparser-api.o   cxx(target) /users/andyarmstrong/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/libv8-3.16.14.8/vendor/v8/out/x64.release/obj.target/preparser_lib/src/scanner.o   cxx(target) /users/andyarmstrong/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/libv8-3.16.14.8/vendor/v8/out/x64.release/obj.target/preparser_lib/src/strtod.o   cxx(target) /users/andyarmstrong/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/libv8-3.16.14.8/vendor/v8/out/x64.release/obj.target/preparser_lib/src/token.o   cxx(target) /users/andyarmstrong/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/libv8-3.16.14.8/vendor/v8/out/x64.release/obj.target/preparser_lib/src/unicode.o   cxx(target) /users/andyarmstrong/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/libv8-3.16.14.8/vendor/v8/out/x64.release/obj.target/preparser_lib/src/utils.o   libtool-static /users/andyarmstrong/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/libv8-3.16.14.8/vendor/v8/out/x64.release/libpreparser_lib.a   cxx(target) /users/andyarmstrong/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/libv8-3.16.14.8/vendor/v8/out/x64.release/obj.target/preparser/preparser/preparser-process.o   link(target) /users/andyarmstrong/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/libv8-3.16.14.8/vendor/v8/out/x64.release/preparser   cxx(target) /users/andyarmstrong/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/libv8-3.16.14.8/vendor/v8/out/x64.release/obj.target/v8_base/src/accessors.o  extconf failed, exit code 1  gem files remain installed in /users/andyarmstrong/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/libv8-3.16.14.8 inspection. results logged /users/andyarmstrong/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/extensions/x86_64-darwin-14/2.1.0-static/libv8-3.16.14.8/gem_make.out error occurred while installing libv8 (3.16.14.8), , bundler cannot continue. make sure `gem install libv8 -v '3.16.14.8'` succeeds before bundling. 

so try command error suggests:

gem install libv8 -v '3.16.14.8' 

this command fails error:

andys-macbook-pro:andyhelloworldruby andyarmstrong$ gem install libv8 -v '3.16.14.8' building native extensions.  take while... error:  error installing libv8:     error: failed build gem native extension.      /users/andyarmstrong/.rbenv/versions/2.1.5/bin/ruby -r ./siteconf20150701-18322-ri2u8p.rb extconf.rb creating makefile compiling v8 x64 using python 2.7.6 using compiler: /usr/bin/c++ (clang version 6.1.0) /applications/xcode.app/contents/developer/toolchains/xcodedefault.xctoolchain/usr/bin/libtool: file: /users/andyarmstrong/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/libv8-3.16.14.8/vendor/v8/out/x64.release/obj.target/preparser_lib/src/atomicops_internals_x86_gcc.o has no symbols in file included ../src/accessors.cc:28: in file included ../src/v8.h:60: in file included ../src/objects-inl.h:38: in file included ../src/elements.h:33: in file included ../src/heap.h:35: in file included ../src/incremental-marking.h:33: in file included ../src/mark-compact.h:32: ../src/spaces.h:896:26: error: 'this' pointer cannot null in well-defined c++ code; comparison may assumed evaluate true [-werror,-wtautological-undefined-compare]   bool exists() { return != null && code_range_ != null; }                          ^~~~    ~~~~ ../src/spaces.h:898:9: error: 'this' pointer cannot null in well-defined c++ code; comparison may assumed evaluate false [-werror,-wtautological-undefined-compare]     if (this == null || code_range_ == null) return false;         ^~~~    ~~~~ 2 errors generated. make[1]: *** [/users/andyarmstrong/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/libv8-3.16.14.8/vendor/v8/out/x64.release/obj.target/v8_base/src/accessors.o] error 1 make: *** [x64.release] error 2 /users/andyarmstrong/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/libv8-3.16.14.8/ext/libv8/location.rb:36:in `block in verify_installation!': libv8 did not install properly, expected binary v8 archive '/users/andyarmstrong/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/libv8-3.16.14.8/vendor/v8/out/x64.release/obj.target/tools/gyp/libv8_base.a'to exist, not found (libv8::location::vendor::archivenotfound)     /users/andyarmstrong/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/libv8-3.16.14.8/ext/libv8/location.rb:35:in `each'     /users/andyarmstrong/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/libv8-3.16.14.8/ext/libv8/location.rb:35:in `verify_installation!'     /users/andyarmstrong/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/libv8-3.16.14.8/ext/libv8/location.rb:26:in `install!'     extconf.rb:7:in `<main>' gyp_generators=make \     build/gyp/gyp --generator-output="out" build/all.gyp \                   -ibuild/standalone.gypi --depth=. \                   -dv8_target_arch=x64 \                   -s.x64  -dv8_enable_backtrace=1 -dv8_can_use_vfp2_instructions=true -darm_fpu=vfpv2 -dv8_can_use_vfp3_instructions=true -darm_fpu=vfpv3 -dwerror=''   cxx(target) /users/andyarmstrong/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/libv8-3.16.14.8/vendor/v8/out/x64.release/obj.target/preparser_lib/src/allocation.o   cxx(target) /users/andyarmstrong/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/libv8-3.16.14.8/vendor/v8/out/x64.release/obj.target/preparser_lib/src/atomicops_internals_x86_gcc.o   cxx(target) /users/andyarmstrong/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/libv8-3.16.14.8/vendor/v8/out/x64.release/obj.target/preparser_lib/src/bignum.o   cxx(target) /users/andyarmstrong/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/libv8-3.16.14.8/vendor/v8/out/x64.release/obj.target/preparser_lib/src/bignum-dtoa.o   cxx(target) /users/andyarmstrong/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/libv8-3.16.14.8/vendor/v8/out/x64.release/obj.target/preparser_lib/src/cached-powers.o   cxx(target) /users/andyarmstrong/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/libv8-3.16.14.8/vendor/v8/out/x64.release/obj.target/preparser_lib/src/conversions.o   cxx(target) /users/andyarmstrong/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/libv8-3.16.14.8/vendor/v8/out/x64.release/obj.target/preparser_lib/src/diy-fp.o   cxx(target) /users/andyarmstrong/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/libv8-3.16.14.8/vendor/v8/out/x64.release/obj.target/preparser_lib/src/dtoa.o   cxx(target) /users/andyarmstrong/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/libv8-3.16.14.8/vendor/v8/out/x64.release/obj.target/preparser_lib/src/fast-dtoa.o   cxx(target) /users/andyarmstrong/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/libv8-3.16.14.8/vendor/v8/out/x64.release/obj.target/preparser_lib/src/fixed-dtoa.o   cxx(target) /users/andyarmstrong/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/libv8-3.16.14.8/vendor/v8/out/x64.release/obj.target/preparser_lib/src/once.o   cxx(target) /users/andyarmstrong/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/libv8-3.16.14.8/vendor/v8/out/x64.release/obj.target/preparser_lib/src/preparse-data.o   cxx(target) /users/andyarmstrong/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/libv8-3.16.14.8/vendor/v8/out/x64.release/obj.target/preparser_lib/src/preparser.o   cxx(target) /users/andyarmstrong/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/libv8-3.16.14.8/vendor/v8/out/x64.release/obj.target/preparser_lib/src/preparser-api.o   cxx(target) /users/andyarmstrong/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/libv8-3.16.14.8/vendor/v8/out/x64.release/obj.target/preparser_lib/src/scanner.o   cxx(target) /users/andyarmstrong/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/libv8-3.16.14.8/vendor/v8/out/x64.release/obj.target/preparser_lib/src/strtod.o   cxx(target) /users/andyarmstrong/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/libv8-3.16.14.8/vendor/v8/out/x64.release/obj.target/preparser_lib/src/token.o   cxx(target) /users/andyarmstrong/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/libv8-3.16.14.8/vendor/v8/out/x64.release/obj.target/preparser_lib/src/unicode.o   cxx(target) /users/andyarmstrong/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/libv8-3.16.14.8/vendor/v8/out/x64.release/obj.target/preparser_lib/src/utils.o   libtool-static /users/andyarmstrong/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/libv8-3.16.14.8/vendor/v8/out/x64.release/libpreparser_lib.a   cxx(target) /users/andyarmstrong/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/libv8-3.16.14.8/vendor/v8/out/x64.release/obj.target/preparser/preparser/preparser-process.o   link(target) /users/andyarmstrong/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/libv8-3.16.14.8/vendor/v8/out/x64.release/preparser   cxx(target) /users/andyarmstrong/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/libv8-3.16.14.8/vendor/v8/out/x64.release/obj.target/v8_base/src/accessors.o  extconf failed, exit code 1  gem files remain installed in /users/andyarmstrong/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/gems/libv8-3.16.14.8 inspection. results logged /users/andyarmstrong/.rbenv/versions/2.1.5/lib/ruby/gems/2.1.0/extensions/x86_64-darwin-14/2.1.0-static/libv8-3.16.14.8/gem_make.out 

doing searching tried following command:

gem install libv8 -v '3.16.14.8' -- --with-system-v8 - succeeds, when try bundle update again, therubyracer fails resolve v8 don't think system has v8 installed.

how can resolve libv8 issue?

the problem because of problem in libv8 source : https://github.com/cowboyd/libv8/issues/174

it fixed installing '3.16.14.7' this:

gem install libv8 -v '3.16.14.7'  

and passed, adding gemfile:

gem 'libv8', '3.16.14.7'