Gem 安装 therubyracer -v '0.11.4'？
Gem install therubyracer -v '0.11.4'?
安装 therubyracer 我快疯了。我知道有很多人和我有同样的问题，我也看过这些问题，但是对我来说太复杂了，因为不同的情况有不同的解决方案。事实上，一直没有很好的方法来解决这个问题。我的问题跟this, and there have a discussion差不多，但是一直没有定论。
尽管如此，this 是 Chris S 提出的一个好问题，但不是一个好的结果。
① 以下是关于我的问题的一些注释：
1.ruby 2.2.1p85（2015-02-26 修订版 49769）[x86_64-darwin15]
2.libv8 3.11.8.17 带有原生扩展
② OS X 埃尔卡皮坦，10.11
③ 以下是错误信息：
ERROR: Error installing therubyracer:
ERROR: Failed to build gem native extension.
/Users/hufeipeng/.rbenv/versions/2.2.1/bin/ruby -r ./siteconf20151026-41811-14t2l9a.rb extconf.rb
checking for main() in -lpthread... yes
checking for main() in -lobjc... yes
checking for v8.h... yes
creating Makefile
make "DESTDIR=" clean
make "DESTDIR="
compiling accessor.cc
clang: warning: argument unused during compilation: '-rdynamic'
In file included from accessor.cc:1:
In file included from ./rr.h:4:
/usr/local/include/v8.h:353:33: error: use of undeclared identifier 'nullptr'
V8_INLINE MaybeLocal() : val_(nullptr) {}
^
/usr/local/include/v8.h:360:51: error: use of undeclared identifier 'nullptr'
V8_INLINE bool IsEmpty() const { return val_ == nullptr; }
^
/usr/local/include/v8.h:364:29: error: use of undeclared identifier 'nullptr'
out->val_ = IsEmpty() ? nullptr : this->val_;
^
/usr/local/include/v8.h:430:50: error: use of undeclared identifier 'nullptr'
bool IsFirstPass() const { return callback_ != nullptr; }
^
/usr/local/include/v8.h:790:42: error: use of undeclared identifier 'nullptr'
V8_INLINE Global() : PersistentBase<T>(nullptr) {}
^
/usr/local/include/v8.h:815:18: error: use of undeclared identifier 'nullptr'
other.val_ = nullptr;
^
/usr/local/include/v8.h:827:18: error: use of undeclared identifier 'nullptr'
rhs.val_ = nullptr;
^
/usr/local/include/v8.h:1092:52: error: use of undeclared identifier 'nullptr'
ScriptOrigin* origin = nullptr));
^
/usr/local/include/v8config.h:347:48: note: expanded from macro 'V8_DEPRECATE_SOON'
#define V8_DEPRECATE_SOON(message, declarator) declarator
^
In file included from accessor.cc:1:
In file included from ./rr.h:4:
/usr/local/include/v8.h:1095:30: error: use of undeclared identifier 'nullptr'
ScriptOrigin* origin = nullptr);
^
/usr/local/include/v8.h:2283:42: error: 'v8::NewStringType' is not a class, namespace, or scoped enumeration
kNormalString = static_cast<int>(v8::NewStringType::kNormal),
^
/usr/local/include/v8.h:2284:48: error: 'v8::NewStringType' is not a class, namespace, or scoped enumeration
kInternalizedString = static_cast<int>(v8::NewStringType::kInternalized)
^
/usr/local/include/v8.h:3205:36: error: use of undeclared identifier 'nullptr'
return NewInstance(context, 0, nullptr);
^
/usr/local/include/v8.h:3434:38: error: 'v8::ArrayBufferCreationMode' is not a class, namespace, or scoped enumeration
ArrayBufferCreationMode mode = ArrayBufferCreationMode::kExternalized);
^
/usr/local/include/v8.h:3797:38: error: 'v8::ArrayBufferCreationMode' is not a class, namespace, or scoped enumeration
ArrayBufferCreationMode mode = ArrayBufferCreationMode::kExternalized);
^
/usr/local/include/v8.h:4457:36: error: 'v8::PropertyHandlerFlags' is not a class, namespace, or scoped enumeration
PropertyHandlerFlags flags = PropertyHandlerFlags::kNone)
^
/usr/local/include/v8.h:4485:36: error: 'v8::PropertyHandlerFlags' is not a class, namespace, or scoped enumeration
PropertyHandlerFlags flags = PropertyHandlerFlags::kNone)
^
/usr/local/include/v8.h:7151:27: error: use of undeclared identifier 'nullptr'
if (V8_UNLIKELY(val_ == nullptr)) V8::ToLocalEmpty();
^
/usr/local/include/v8config.h:353:54: note: expanded from macro 'V8_UNLIKELY'
# define V8_UNLIKELY(condition) (__builtin_expect(!!(condition), 0))
^
In file included from accessor.cc:1:
In file included from ./rr.h:4:
/usr/local/include/v8.h:7596:46: error: 'v8::NewStringType' is not a class, namespace, or scoped enumeration
Set(v8::String::NewFromUtf8(isolate, name, NewStringType::kNormal)
^
In file included from accessor.cc:1:
./rr.h:358:39: error: no member named 'ScriptData' in namespace 'v8'
class ScriptData : public Pointer<v8::ScriptData> {
~~~~^
fatal error: too many errors emitted, stopping now [-ferror-limit=]
20 errors generated.
make: *** [accessor.o] Error 1
make failed, exit code 2
Gem files will remain installed in
/Users/*/.rbenv/versions/2.2.1/lib/ruby/gems/2.2.0/gems/therubyracer-0.11.4 for inspection.
Results logged to
/Users/*/.rbenv/versions/2.2.1/lib/ruby/gems/2.2.0/extensions/x86_64-darwin-15/2.2.0-static/therubyracer-0.11.4/gem_make.out
求助！
嗯，首先我很抱歉再次重新编辑这个问题，太忙没时间注意你们为我回复的评论。而且，在这里，我非常感谢@Javid Jamae 为我提供了一个解决问题的好方法，虽然还有一些小问题需要处理，但没关系，我们只需要错误来帮助我们找到最终答案。以下是我尝试@Javid Jamae 方式后的控制台，
首先，我之前没有用brew安装过gcc，所以用brew安装，版本是最新的5.2.0 (/usr/local/Cellar/gcc/5.2.0)。详情如下：
➜ /Users/xxx >brew install gcc
==> Installing dependencies for gcc: gmp, mpfr, libmpc, isl
==> Installing gcc dependency: gmp
==> Downloading https://homebrew.bintray.com/bottles/gmp-6.0.0a.el_capitan.bottle.tar.gz
######################################################################## 100.0%
==> Pouring gmp-6.0.0a.el_capitan.bottle.tar.gz
/usr/local/Cellar/gmp/6.0.0a: 15 files, 3.2M
==> Installing gcc dependency: mpfr
==> Downloading https://homebrew.bintray.com/bottles/mpfr-3.1.3.el_capitan.bottle.tar.gz
######################################################################## 100.0%
==> Pouring mpfr-3.1.3.el_capitan.bottle.tar.gz
/usr/local/Cellar/mpfr/3.1.3: 24 files, 3.6M
==> Installing gcc dependency: libmpc
==> Downloading https://homebrew.bintray.com/bottles/libmpc-1.0.3.el_capitan.bottle.tar.gz
######################################################################## 100.0%
==> Pouring libmpc-1.0.3.el_capitan.bottle.tar.gz
/usr/local/Cellar/libmpc/1.0.3: 10 files, 380K
==> Installing gcc dependency: isl
==> Downloading https://homebrew.bintray.com/bottles/isl-0.14.1.el_capitan.bottle.3.tar.gz
######################################################################## 100.0%
==> Pouring isl-0.14.1.el_capitan.bottle.3.tar.gz
/usr/local/Cellar/isl/0.14.1: 68 files, 3.2M
==> Installing gcc
==> Downloading https://homebrew.bintray.com/bottles/gcc-5.2.0.el_capitan.bottle.2.tar.gz
##################### 29.8%
curl: (56) SSLRead() return error -9806
Error: Failed to download resource "gcc"
Download failed: https://homebrew.bintray.com/bottles/gcc-5.2.0.el_capitan.bottle.2.tar.gz
Warning: Bottle installation failed: building from source.
==> Downloading http://ftpmirror.gnu.org/gcc/gcc-5.2.0/gcc-5.2.0.tar.bz2
==> Downloading from http://mirrors.ustc.edu.cn/gnu/gcc/gcc-5.2.0/gcc-5.2.0.tar.bz2
######################################################################## 100.0%
==> Patching
patching file gcc/jit/Make-lang.in
patching file gcc/jit/jit-playback.c
Hunk #1 succeeded at 2459 with fuzz 2 (offset 43 lines).
==> ../configure --build=x86_64-apple-darwin15.0.0 --prefix=/usr/local/Cellar/gcc/5.2.0 --libdir=/usr/local/Cel
==> make bootstrap
==> make install
==> Caveats
GCC has been built with multilib support. Notably, OpenMP may not work:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=60670
If you need OpenMP support you may want to brew reinstall gcc --without-multilib
==> Summary
/usr/local/Cellar/gcc/5.2.0: 1353 files, 248M, built in 52.4 minutes
看来安装没问题！然后，我用 gem 卸载了 therubyracer 和 libv8。但是，在安装 therubyracer 时（我在安装时或在 Gemfile 中没有指出版本，并且bundle 提醒我需要版本 0.12.2），出现错误：
➜ /Users/xxx/Documents/workspace/xxx git:(master) ✗ >gem install therubyracer -v '0.12.2'
Fetching: libv8-3.16.14.13.gem (100%)
Building native extensions. This could take a while...
ERROR: Error installing therubyracer:
ERROR: Failed to build gem native extension.
/Users/xxx/.rbenv/versions/2.2.1/bin/ruby -r ./siteconf20151230-50968-1yqguip.rb extconf.rb
creating Makefile
Compiling v8 for x64
Using python 2.7.10
Using compiler: /usr/bin/c++ (clang version 6.1.0)
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/libtool: file:
/Users/xxx/.rbenv/versions/2.2.1/lib/ruby/gems/2.2.0/gems/libv8-3.16.14.13/vendor/v8/out/x64.release/obj.target/preparser_lib/src/atomicops_internals_x86_gcc.o has no symbols
In file included from ../src/accessors.cc:28:
In file included from ../src/v8.h:60:
In file included from ../src/objects-inl.h:38:
In file included from ../src/elements.h:33:
In file included from ../src/heap.h:35:
In file included from ../src/incremental-marking.h:33:
In file included from ../src/mark-compact.h:32:
../src/spaces.h:896:26: error: 'this' pointer cannot be null in well-defined C++ code; comparison may be assumed to always evaluate to true [-Werror,-Wtautological-undefined-compare]
bool exists() { return this != NULL && code_range_ != NULL; }
^~~~ ~~~~
../src/spaces.h:898:9: error: 'this' pointer cannot be null in well-defined C++ code; comparison may be assumed to always evaluate to false [-Werror,-Wtautological-undefined-compare]
if (this == NULL || code_range_ == NULL) return false;
^~~~ ~~~~
2 errors generated.
make[1]: ***
[/Users/xxx/.rbenv/versions/2.2.1/lib/ruby/gems/2.2.0/gems/libv8-3.16.14.13/vendor/v8/out/x64.release/obj.target/v8_base/src/accessors.o]
Error 1
make: *** [x64.release] Error 2
/Users/xxx/.rbenv/versions/2.2.1/lib/ruby/gems/2.2.0/gems/libv8-3.16.14.13/ext/libv8/location.rb:36:in `block in verify_installation!': libv8 did not install properly, expected binary v8 archive '
/Users/xxx/.rbenv/versions/2.2.1/lib/ruby/gems/2.2.0/gems/libv8-3.16.14.13/vendor/v8/out/x64.release/obj.target/tools/gyp/libv8_base.a'to exist, but it was not found (Libv8::Location::Vendor::ArchiveNotFound)
from
/Users/xxx/.rbenv/versions/2.2.1/lib/ruby/gems/2.2.0/gems/libv8-3.16.14.13/ext/libv8/location.rb:35:in `each'
from
/Uses/xxx/.rbenv/versions/2.2.1/lib/ruby/gems/2.2.0/gems/libv8-3.16.14.13/ext/libv8/location.rb:35:in `verify_installation!'
from
/Users/xxx/.rbenv/versions/2.2.1/lib/ruby/gems/2.2.0/gems/libv8-3.16.14.13/ext/libv8/location.rb:26:in `install!'
from 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/xxx/.rbenv/versions/2.2.1/lib/ruby/gems/2.2.0/gems/libv8-3.16.14.13/vendor/v8/out/x64.release/obj.target/preparser_lib/src/allocation.o
CXX(target)
/Users/xxx/.rbenv/versions/2.2.1/lib/ruby/gems/2.2.0/gems/libv8-3.16.14.13/vendor/v8/out/x64.release/obj.target/preparser_lib/src/atomicops_internals_x86_gcc.o
CXX(target)
/Users/xxx/.rbenv/versions/2.2.1/lib/ruby/gems/2.2.0/gems/libv8-3.16.14.13/vendor/v8/out/x64.release/obj.target/preparser_lib/src/bignum.o
.................. (the follow error messages are similar to above)
嗯，还是libv8的问题！一开始我觉得可能是therubyracer版本的问题，于是尝试安装0.12.0[版本=66=]，不幸的是，有同样的错误。有些奇怪，我的意思是 libv8 在我的例子中安装了 therubyracer（从错误中看到）消息），但你和我不同。正如你的建议标记你在安装 therubyracer 之后安装 libv8，为什么它们不同？可能跟我的ruby环境设置有关，这里贴出我的Gemfile配置：
gem 'rails', '4.1.6'
gem 'mysql2', '0.3.18'
gem 'sass-rails', '~> 4.0.3'
gem 'bootstrap-sass', '~> 3.3.4'
gem 'uglifier', '>= 1.3.0'
gem 'coffee-rails', '~> 4.0.0'
gem 'therubyracer', platforms: :ruby
gem 'jquery-rails','3.1.2'
gem 'jquery-ui-rails', '4.0.5'
gem 'turbolinks'
gem 'jbuilder', '~> 2.0'
gem 'sdoc', '~> 0.4.0', group: :doc
gem 'log4r', '1.1.9'
gem 'devise','3.4.1'
gem 'carrierwave', '0.10.0'
gem 'mini_magick', '3.6.0'
gem 'thin','1.6.2'
gem 'kaminari', '0.16.1'
gem 'factory_girl_rails'
gem 'httparty'
gem "select2-rails",'3.5.9.3'
group :test, :development do
gem 'net-ssh', '2.7.0'
gem 'capistrano', '2.12.0'
gem 'capistrano-rbenv', '1.0.1'
gem 'spring'
gem 'magic_encoding', '0.0.2'
gem 'rspec-rails', '3.2.0'
end
我遇到了同样的问题，将 therubyracer 更新到最新版本解决了这个问题。
尝试：
bundle update therubyracer
如果您对 libv8 也有问题，请尝试：
bundle update libv8
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
参考文献：
我在 OSX El Capitan 遇到了山姆问题。我用来克服这个问题的步骤是
首先检查是否安装了V8。我是用brew安装的
brew install homebrew/versions/v8-315
如果存在某些实例，请尝试卸载 libv8、therubyracer gems。
gem uninstall -a libv8
gem uninstall -a therubyracer
然后安装 libv8 gem。
gem install libv8 -v '<<VERSION>>' -- --with-system-v8
然后安装 therubyracer gem。
gem install therubyracer -v '<<VERSION>>' -- --with-v8-dir=$(brew --prefix v8-315)
安装 therubyracer 我快疯了。我知道有很多人和我有同样的问题，我也看过这些问题，但是对我来说太复杂了，因为不同的情况有不同的解决方案。事实上，一直没有很好的方法来解决这个问题。我的问题跟this, and there have a discussion差不多，但是一直没有定论。
尽管如此，this 是 Chris S 提出的一个好问题，但不是一个好的结果。
① 以下是关于我的问题的一些注释：
1.ruby 2.2.1p85（2015-02-26 修订版 49769）[x86_64-darwin15]
2.libv8 3.11.8.17 带有原生扩展
② OS X 埃尔卡皮坦，10.11
③ 以下是错误信息：
ERROR: Error installing therubyracer:
ERROR: Failed to build gem native extension.
/Users/hufeipeng/.rbenv/versions/2.2.1/bin/ruby -r ./siteconf20151026-41811-14t2l9a.rb extconf.rb
checking for main() in -lpthread... yes
checking for main() in -lobjc... yes
checking for v8.h... yes
creating Makefile
make "DESTDIR=" clean
make "DESTDIR="
compiling accessor.cc
clang: warning: argument unused during compilation: '-rdynamic'
In file included from accessor.cc:1:
In file included from ./rr.h:4:
/usr/local/include/v8.h:353:33: error: use of undeclared identifier 'nullptr'
V8_INLINE MaybeLocal() : val_(nullptr) {}
^
/usr/local/include/v8.h:360:51: error: use of undeclared identifier 'nullptr'
V8_INLINE bool IsEmpty() const { return val_ == nullptr; }
^
/usr/local/include/v8.h:364:29: error: use of undeclared identifier 'nullptr'
out->val_ = IsEmpty() ? nullptr : this->val_;
^
/usr/local/include/v8.h:430:50: error: use of undeclared identifier 'nullptr'
bool IsFirstPass() const { return callback_ != nullptr; }
^
/usr/local/include/v8.h:790:42: error: use of undeclared identifier 'nullptr'
V8_INLINE Global() : PersistentBase<T>(nullptr) {}
^
/usr/local/include/v8.h:815:18: error: use of undeclared identifier 'nullptr'
other.val_ = nullptr;
^
/usr/local/include/v8.h:827:18: error: use of undeclared identifier 'nullptr'
rhs.val_ = nullptr;
^
/usr/local/include/v8.h:1092:52: error: use of undeclared identifier 'nullptr'
ScriptOrigin* origin = nullptr));
^
/usr/local/include/v8config.h:347:48: note: expanded from macro 'V8_DEPRECATE_SOON'
#define V8_DEPRECATE_SOON(message, declarator) declarator
^
In file included from accessor.cc:1:
In file included from ./rr.h:4:
/usr/local/include/v8.h:1095:30: error: use of undeclared identifier 'nullptr'
ScriptOrigin* origin = nullptr);
^
/usr/local/include/v8.h:2283:42: error: 'v8::NewStringType' is not a class, namespace, or scoped enumeration
kNormalString = static_cast<int>(v8::NewStringType::kNormal),
^
/usr/local/include/v8.h:2284:48: error: 'v8::NewStringType' is not a class, namespace, or scoped enumeration
kInternalizedString = static_cast<int>(v8::NewStringType::kInternalized)
^
/usr/local/include/v8.h:3205:36: error: use of undeclared identifier 'nullptr'
return NewInstance(context, 0, nullptr);
^
/usr/local/include/v8.h:3434:38: error: 'v8::ArrayBufferCreationMode' is not a class, namespace, or scoped enumeration
ArrayBufferCreationMode mode = ArrayBufferCreationMode::kExternalized);
^
/usr/local/include/v8.h:3797:38: error: 'v8::ArrayBufferCreationMode' is not a class, namespace, or scoped enumeration
ArrayBufferCreationMode mode = ArrayBufferCreationMode::kExternalized);
^
/usr/local/include/v8.h:4457:36: error: 'v8::PropertyHandlerFlags' is not a class, namespace, or scoped enumeration
PropertyHandlerFlags flags = PropertyHandlerFlags::kNone)
^
/usr/local/include/v8.h:4485:36: error: 'v8::PropertyHandlerFlags' is not a class, namespace, or scoped enumeration
PropertyHandlerFlags flags = PropertyHandlerFlags::kNone)
^
/usr/local/include/v8.h:7151:27: error: use of undeclared identifier 'nullptr'
if (V8_UNLIKELY(val_ == nullptr)) V8::ToLocalEmpty();
^
/usr/local/include/v8config.h:353:54: note: expanded from macro 'V8_UNLIKELY'
# define V8_UNLIKELY(condition) (__builtin_expect(!!(condition), 0))
^
In file included from accessor.cc:1:
In file included from ./rr.h:4:
/usr/local/include/v8.h:7596:46: error: 'v8::NewStringType' is not a class, namespace, or scoped enumeration
Set(v8::String::NewFromUtf8(isolate, name, NewStringType::kNormal)
^
In file included from accessor.cc:1:
./rr.h:358:39: error: no member named 'ScriptData' in namespace 'v8'
class ScriptData : public Pointer<v8::ScriptData> {
~~~~^
fatal error: too many errors emitted, stopping now [-ferror-limit=]
20 errors generated.
make: *** [accessor.o] Error 1
make failed, exit code 2
Gem files will remain installed in
/Users/*/.rbenv/versions/2.2.1/lib/ruby/gems/2.2.0/gems/therubyracer-0.11.4 for inspection.
Results logged to
/Users/*/.rbenv/versions/2.2.1/lib/ruby/gems/2.2.0/extensions/x86_64-darwin-15/2.2.0-static/therubyracer-0.11.4/gem_make.out
求助！
嗯，首先我很抱歉再次重新编辑这个问题，太忙没时间注意你们为我回复的评论。而且，在这里，我非常感谢@Javid Jamae 为我提供了一个解决问题的好方法，虽然还有一些小问题需要处理，但没关系，我们只需要错误来帮助我们找到最终答案。以下是我尝试@Javid Jamae 方式后的控制台，
首先，我之前没有用brew安装过gcc，所以用brew安装，版本是最新的5.2.0 (/usr/local/Cellar/gcc/5.2.0)。详情如下：
➜ /Users/xxx >brew install gcc
==> Installing dependencies for gcc: gmp, mpfr, libmpc, isl
==> Installing gcc dependency: gmp
==> Downloading https://homebrew.bintray.com/bottles/gmp-6.0.0a.el_capitan.bottle.tar.gz
######################################################################## 100.0%
==> Pouring gmp-6.0.0a.el_capitan.bottle.tar.gz
/usr/local/Cellar/gmp/6.0.0a: 15 files, 3.2M
==> Installing gcc dependency: mpfr
==> Downloading https://homebrew.bintray.com/bottles/mpfr-3.1.3.el_capitan.bottle.tar.gz
######################################################################## 100.0%
==> Pouring mpfr-3.1.3.el_capitan.bottle.tar.gz
/usr/local/Cellar/mpfr/3.1.3: 24 files, 3.6M
==> Installing gcc dependency: libmpc
==> Downloading https://homebrew.bintray.com/bottles/libmpc-1.0.3.el_capitan.bottle.tar.gz
######################################################################## 100.0%
==> Pouring libmpc-1.0.3.el_capitan.bottle.tar.gz
/usr/local/Cellar/libmpc/1.0.3: 10 files, 380K
==> Installing gcc dependency: isl
==> Downloading https://homebrew.bintray.com/bottles/isl-0.14.1.el_capitan.bottle.3.tar.gz
######################################################################## 100.0%
==> Pouring isl-0.14.1.el_capitan.bottle.3.tar.gz
/usr/local/Cellar/isl/0.14.1: 68 files, 3.2M
==> Installing gcc
==> Downloading https://homebrew.bintray.com/bottles/gcc-5.2.0.el_capitan.bottle.2.tar.gz
##################### 29.8%
curl: (56) SSLRead() return error -9806
Error: Failed to download resource "gcc"
Download failed: https://homebrew.bintray.com/bottles/gcc-5.2.0.el_capitan.bottle.2.tar.gz
Warning: Bottle installation failed: building from source.
==> Downloading http://ftpmirror.gnu.org/gcc/gcc-5.2.0/gcc-5.2.0.tar.bz2
==> Downloading from http://mirrors.ustc.edu.cn/gnu/gcc/gcc-5.2.0/gcc-5.2.0.tar.bz2
######################################################################## 100.0%
==> Patching
patching file gcc/jit/Make-lang.in
patching file gcc/jit/jit-playback.c
Hunk #1 succeeded at 2459 with fuzz 2 (offset 43 lines).
==> ../configure --build=x86_64-apple-darwin15.0.0 --prefix=/usr/local/Cellar/gcc/5.2.0 --libdir=/usr/local/Cel
==> make bootstrap
==> make install
==> Caveats
GCC has been built with multilib support. Notably, OpenMP may not work:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=60670
If you need OpenMP support you may want to brew reinstall gcc --without-multilib
==> Summary
/usr/local/Cellar/gcc/5.2.0: 1353 files, 248M, built in 52.4 minutes
看来安装没问题！然后，我用 gem 卸载了 therubyracer 和 libv8。但是，在安装 therubyracer 时（我在安装时或在 Gemfile 中没有指出版本，并且bundle 提醒我需要版本 0.12.2），出现错误：
➜ /Users/xxx/Documents/workspace/xxx git:(master) ✗ >gem install therubyracer -v '0.12.2'
Fetching: libv8-3.16.14.13.gem (100%)
Building native extensions. This could take a while...
ERROR: Error installing therubyracer:
ERROR: Failed to build gem native extension.
/Users/xxx/.rbenv/versions/2.2.1/bin/ruby -r ./siteconf20151230-50968-1yqguip.rb extconf.rb
creating Makefile
Compiling v8 for x64
Using python 2.7.10
Using compiler: /usr/bin/c++ (clang version 6.1.0)
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/libtool: file:
/Users/xxx/.rbenv/versions/2.2.1/lib/ruby/gems/2.2.0/gems/libv8-3.16.14.13/vendor/v8/out/x64.release/obj.target/preparser_lib/src/atomicops_internals_x86_gcc.o has no symbols
In file included from ../src/accessors.cc:28:
In file included from ../src/v8.h:60:
In file included from ../src/objects-inl.h:38:
In file included from ../src/elements.h:33:
In file included from ../src/heap.h:35:
In file included from ../src/incremental-marking.h:33:
In file included from ../src/mark-compact.h:32:
../src/spaces.h:896:26: error: 'this' pointer cannot be null in well-defined C++ code; comparison may be assumed to always evaluate to true [-Werror,-Wtautological-undefined-compare]
bool exists() { return this != NULL && code_range_ != NULL; }
^~~~ ~~~~
../src/spaces.h:898:9: error: 'this' pointer cannot be null in well-defined C++ code; comparison may be assumed to always evaluate to false [-Werror,-Wtautological-undefined-compare]
if (this == NULL || code_range_ == NULL) return false;
^~~~ ~~~~
2 errors generated.
make[1]: ***
[/Users/xxx/.rbenv/versions/2.2.1/lib/ruby/gems/2.2.0/gems/libv8-3.16.14.13/vendor/v8/out/x64.release/obj.target/v8_base/src/accessors.o]
Error 1
make: *** [x64.release] Error 2
/Users/xxx/.rbenv/versions/2.2.1/lib/ruby/gems/2.2.0/gems/libv8-3.16.14.13/ext/libv8/location.rb:36:in `block in verify_installation!': libv8 did not install properly, expected binary v8 archive '
/Users/xxx/.rbenv/versions/2.2.1/lib/ruby/gems/2.2.0/gems/libv8-3.16.14.13/vendor/v8/out/x64.release/obj.target/tools/gyp/libv8_base.a'to exist, but it was not found (Libv8::Location::Vendor::ArchiveNotFound)
from
/Users/xxx/.rbenv/versions/2.2.1/lib/ruby/gems/2.2.0/gems/libv8-3.16.14.13/ext/libv8/location.rb:35:in `each'
from
/Uses/xxx/.rbenv/versions/2.2.1/lib/ruby/gems/2.2.0/gems/libv8-3.16.14.13/ext/libv8/location.rb:35:in `verify_installation!'
from
/Users/xxx/.rbenv/versions/2.2.1/lib/ruby/gems/2.2.0/gems/libv8-3.16.14.13/ext/libv8/location.rb:26:in `install!'
from 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/xxx/.rbenv/versions/2.2.1/lib/ruby/gems/2.2.0/gems/libv8-3.16.14.13/vendor/v8/out/x64.release/obj.target/preparser_lib/src/allocation.o
CXX(target)
/Users/xxx/.rbenv/versions/2.2.1/lib/ruby/gems/2.2.0/gems/libv8-3.16.14.13/vendor/v8/out/x64.release/obj.target/preparser_lib/src/atomicops_internals_x86_gcc.o
CXX(target)
/Users/xxx/.rbenv/versions/2.2.1/lib/ruby/gems/2.2.0/gems/libv8-3.16.14.13/vendor/v8/out/x64.release/obj.target/preparser_lib/src/bignum.o
.................. (the follow error messages are similar to above)
嗯，还是libv8的问题！一开始我觉得可能是therubyracer版本的问题，于是尝试安装0.12.0[版本=66=]，不幸的是，有同样的错误。有些奇怪，我的意思是 libv8 在我的例子中安装了 therubyracer（从错误中看到）消息），但你和我不同。正如你的建议标记你在安装 therubyracer 之后安装 libv8，为什么它们不同？可能跟我的ruby环境设置有关，这里贴出我的Gemfile配置：
gem 'rails', '4.1.6'
gem 'mysql2', '0.3.18'
gem 'sass-rails', '~> 4.0.3'
gem 'bootstrap-sass', '~> 3.3.4'
gem 'uglifier', '>= 1.3.0'
gem 'coffee-rails', '~> 4.0.0'
gem 'therubyracer', platforms: :ruby
gem 'jquery-rails','3.1.2'
gem 'jquery-ui-rails', '4.0.5'
gem 'turbolinks'
gem 'jbuilder', '~> 2.0'
gem 'sdoc', '~> 0.4.0', group: :doc
gem 'log4r', '1.1.9'
gem 'devise','3.4.1'
gem 'carrierwave', '0.10.0'
gem 'mini_magick', '3.6.0'
gem 'thin','1.6.2'
gem 'kaminari', '0.16.1'
gem 'factory_girl_rails'
gem 'httparty'
gem "select2-rails",'3.5.9.3'
group :test, :development do
gem 'net-ssh', '2.7.0'
gem 'capistrano', '2.12.0'
gem 'capistrano-rbenv', '1.0.1'
gem 'spring'
gem 'magic_encoding', '0.0.2'
gem 'rspec-rails', '3.2.0'
end
我遇到了同样的问题，将 therubyracer 更新到最新版本解决了这个问题。
尝试：
bundle update therubyracer
如果您对 libv8 也有问题，请尝试：
bundle update libv8
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
参考文献：
我在 OSX El Capitan 遇到了山姆问题。我用来克服这个问题的步骤是
首先检查是否安装了V8。我是用brew安装的
brew install homebrew/versions/v8-315
如果存在某些实例，请尝试卸载 libv8、therubyracer gems。
gem uninstall -a libv8
gem uninstall -a therubyracer
然后安装 libv8 gem。
gem install libv8 -v '<<VERSION>>' -- --with-system-v8
然后安装 therubyracer gem。
gem install therubyracer -v '<<VERSION>>' -- --with-v8-dir=$(brew --prefix v8-315)