ruby - gem 在 OSX 10.15 上安装 therubyracer -v 0.12.3

Question

我已按照步骤安装 v8 和 libv8 gem。之后，我无法成功安装 therubyracer 0.12.3。 mkmf.log 在尝试验证 v8.h header 时阻塞并抛出一个未知类型名称-error。

我的环境:

• ruby :2.6.3
• 操作系统:10.15
• xcode 选择:2373
• libv8: 3.16.14.19
• v8:v8@3.15(通过 Homebrew) brew info v8@3.15 = v8@3.15: stable 3.15.11.18 (bottled) [keg-only]
• g++:Apple clang 版本 11.0.0 (clang-1100.0.33.17)

我已经完成了建议 here .有人有建议吗？

gem 安装

gem install therubyracer -v '0.12.3' -- --with-v8-dir=/usr/local/opt/v8@3.15

失败信息

Building native extensions with: '--with-v8-dir=/usr/local/opt/v8@3.15'
This could take a while...
ERROR:  Error installing therubyracer:
ERROR: Failed to build gem native extension.

current directory: /Users/kristinsmith/.gem/ruby/2.6.0/gems/therubyracer-0.12.3/ext/v8
/System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/bin/ruby -I 
/Library/Ruby/Site/2.6.0 -r ./siteconf20200120-16109-4pdf22.rb extconf.rb --with-v8- 
dir\=/usr/local/opt/v8@3.15

checking for -lpthread... yes
checking for -lobjc... yes
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=/System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/bin/$(RUBY_BASE_NAME)
--with-pthreadlib
--without-pthreadlib
--with-objclib
--without-objclib
--enable-debug
--disable-debug
--with-v8-dir
--with-v8-include
--without-v8-include=${v8-dir}/include
--with-v8-lib
--without-v8-lib=${v8-dir}/lib
/Users/kristinsmith/.gem/ruby/2.6.0/gems/libv8-3.16.14.19/ext/libv8/location.rb:50:in 
`configure': By using --with-system-v8, you have chosen to use the version  
(Libv8::Location::System::NotFoundError)
of V8 found on your system and *not* the one that is bundled with 
the libv8 rubygem. 

However, your system version of v8 could not be located. 

Please make sure your system version of v8 that is compatible 
with 3.16.14.19 installed. You may need to use the 
--with-v8-dir option if it is installed in a non-standard location
from /Users/kristinsmith/.gem/ruby/2.6.0/gems/libv8-3.16.14.19/lib/libv8.rb:7:in 
`configure_makefile'
from extconf.rb:32:in `<main>'

To see why this extension failed to compile, please check the mkmf.log which can be found here:

/Users/kristinsmith/.gem/ruby/2.6.0/extensions/universal-darwin-19/2.6.0/therubyracer- 
0.12.3/mkmf.log

extconf failed, exit code 1

Gem files will remain installed in /Users/kristinsmith/.gem/ruby/2.6.0/gems/therubyracer- 
0.12.3 for inspection.
Results logged to /Users/kristinsmith/.gem/ruby/2.6.0/extensions/universal-darwin . 
19/2.6.0/therubyracer-0.12.3/gem_make.out

mkmf.log

...
find_header: checking for v8.h... -------------------- no

"xcrun clang I/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10. 
5.sdk/System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/include/ruby-2.6.0/universal-darwin19 -I/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/include/ruby-2.6.0/ruby/backward -I/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/include/ruby-2.6.0 -I. -I/usr/local/opt/v8@3.15/include -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE -D_DARWIN_UNLIMITED_SELECT -D_REENTRANT   -Wall -g -rdynamic  -g -Os -pipe -DHAVE_GCC_ATOMIC_BUILTINS  -arch x86_64  -c conftest.c"
clang: warning: argument unused during compilation: '-rdynamic' [-Wunused-command-line-argument]
 In file included from conftest.c:3:
/usr/local/opt/v8@3.15/include/v8.h:98:1: error: unknown type name 'namespace' namespace v8 
{
 ^
/usr/local/opt/v8@3.15/include/v8.h:98:13: error: expected ';' after top level declarator 
namespace v8 {
        ^
        ;
2 errors generated.
checked program was:
/* begin */
1: #include "ruby.h"
2: 
3: #include <v8.h>
/* end */

--------------------
...

Answer 1

我有同样的错误，最后似乎忽略了 rbenv ruby​​ 版本。运行 eval "$(rbenv init -)" 解决了问题，并且正确安装了 therubyracer。