目前对于在 macOS 上为开发目的安装 Discourse 的通用思路和做法是什么？我尝试按照官方 GitHub 文档中的文章——在 macOS 上为开发安装 Discourse 的初学者指南——进行安装，但未能成功。
在安装 cppjieba_rb-0.3.3 gem 时报告了 3 个错误。
最近有人也遇到过这个问题吗？
执行 gem install cppjieba_rb 的输出是什么？
~/Developer/localhost/discourse on master sudo gem install cppjieba_rb -v '0.3.3' --source 'https://rubygems.org/' at 17:13:33
Password:
Building native extensions. This could take a while...
ERROR: Error installing cppjieba_rb:
ERROR: Failed to build gem native extension.
current directory: /Library/Ruby/Gems/2.6.0/gems/cppjieba_rb-0.3.3/ext/cppjieba_rb
/System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/bin/ruby -I /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0 -r ./siteconf20191021-73798-k500fk.rb extconf.rb
creating Makefile
current directory: /Library/Ruby/Gems/2.6.0/gems/cppjieba_rb-0.3.3/ext/cppjieba_rb
make "DESTDIR=" clean
current directory: /Library/Ruby/Gems/2.6.0/gems/cppjieba_rb-0.3.3/ext/cppjieba_rb
make "DESTDIR="
compiling cppjieba_rb.c
compiling internal.cc
In file included from internal.cc:1:
In file included from /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.h:33:
In file included from /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/ruby.h:24:
/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/universal-darwin19/ruby/config.h:413:31: error: invalid suffix on literal; C++11 requires a space between literal and identifier [-Wreserved-user-defined-literal]
#define RUBY_ARCH "universal-"RUBY_PLATFORM_OS
^
/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/universal-darwin19/ruby/config.h:414:35: error: invalid suffix on literal; C++11 requires a space between literal and identifier [-Wreserved-user-defined-literal]
#define RUBY_PLATFORM "universal."RUBY_PLATFORM_CPU"-"RUBY_PLATFORM_OS
^
/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/universal-darwin19/ruby/config.h:414:55: error: invalid suffix on literal; C++11 requires a space between literal and identifier [-Wreserved-user-defined-literal]
#define RUBY_PLATFORM "universal."RUBY_PLATFORM_CPU"-"RUBY_PLATFORM_OS
^
In file included from internal.cc:1:
In file included from /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.h:33:
In file included from /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/ruby.h:2111:
/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/intern.h:56:19: warning: 'register' storage class specifier is deprecated and incompatible with C++17 [-Wdeprecated-register]
void rb_mem_clear(register VALUE*, register long);
^~~~~~~~~
/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/intern.h:56:36: warning: 'register' storage class specifier is deprecated and incompatible with C++17 [-Wdeprecated-register]
void rb_mem_clear(register VALUE*, register long);
^~~~~~~~~
In file included from internal.cc:8:
In file included from /Library/Ruby/Gems/2.6.0/gems/cppjieba_rb-0.3.3/ext/cppjieba_rb/../cppjieba/include/cppjieba/Jieba.hpp:4:
In file included from /Library/Ruby/Gems/2.6.0/gems/cppjieba_rb-0.3.3/ext/cppjieba_rb/../cppjieba/include/cppjieba/QuerySegment.hpp:8:
In file included from /Library/Ruby/Gems/2.6.0/gems/cppjieba_rb-0.3.3/ext/cppjieba_rb/../cppjieba/include/cppjieba/DictTrie.hpp:13:
/Library/Ruby/Gems/2.6.0/gems/cppjieba_rb-0.3.3/ext/cppjieba_rb/../cppjieba/deps/limonp/StringUtil.hpp:87:70: warning: 'ptr_fun<unsigned int, bool>' is deprecated [-Wdeprecated-declarations]
s.erase(s.begin(), std::find_if(s.begin(), s.end(), std::not1(std::ptr_fun<unsigned, bool>(IsSpace))));
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/functional:1097:1: note: 'ptr_fun<unsigned int, bool>' has been explicitly marked deprecated here
_LIBCPP_DEPRECATED_IN_CXX11 inline _LIBCPP_INLINE_VISIBILITY
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/__config:1101:39: note: expanded from macro '_LIBCPP_DEPRECATED_IN_CXX11'
# define _LIBCPP_DEPRECATED_IN_CXX11 _LIBCPP_DEPRECATED
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/__config:1090:48: note: expanded from macro '_LIBCPP_DEPRECATED'
# define _LIBCPP_DEPRECATED __attribute__ ((deprecated))
^
In file included from internal.cc:8:
In file included from /Library/Ruby/Gems/2.6.0/gems/cppjieba_rb-0.3.3/ext/cppjieba_rb/../cppjieba/include/cppjieba/Jieba.hpp:4:
In file included from /Library/Ruby/Gems/2.6.0/gems/cppjieba_rb-0.3.3/ext/cppjieba_rb/../cppjieba/include/cppjieba/QuerySegment.hpp:8:
In file included from /Library/Ruby/Gems/2.6.0/gems/cppjieba_rb-0.3.3/ext/cppjieba_rb/../cppjieba/include/cppjieba/DictTrie.hpp:13:
/Library/Ruby/Gems/2.6.0/gems/cppjieba_rb-0.3.3/ext/cppjieba_rb/../cppjieba/deps/limonp/StringUtil.hpp:92:61: warning: 'ptr_fun<unsigned int, bool>' is deprecated [-Wdeprecated-declarations]
s.erase(std::find_if(s.rbegin(), s.rend(), std::not1(std::ptr_fun<unsigned, bool>(IsSpace))).base(), s.end());
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/functional:1097:1: note: 'ptr_fun<unsigned int, bool>' has been explicitly marked deprecated here
_LIBCPP_DEPRECATED_IN_CXX11 inline _LIBCPP_INLINE_VISIBILITY
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/__config:1101:39: note: expanded from macro '_LIBCPP_DEPRECATED_IN_CXX11'
# define _LIBCPP_DEPRECATED_IN_CXX11 _LIBCPP_DEPRECATED
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/__config:1090:48: note: expanded from macro '_LIBCPP_DEPRECATED'
# define _LIBCPP_DEPRECATED __attribute__ ((deprecated))
^
In file included from internal.cc:8:
In file included from /Library/Ruby/Gems/2.6.0/gems/cppjieba_rb-0.3.3/ext/cppjieba_rb/../cppjieba/include/cppjieba/Jieba.hpp:4:
In file included from /Library/Ruby/Gems/2.6.0/gems/cppjieba_rb-0.3.3/ext/cppjieba_rb/../cppjieba/include/cppjieba/QuerySegment.hpp:8:
In file included from /Library/Ruby/Gems/2.6.0/gems/cppjieba_rb-0.3.3/ext/cppjieba_rb/../cppjieba/include/cppjieba/DictTrie.hpp:13:
/Library/Ruby/Gems/2.6.0/gems/cppjieba_rb-0.3.3/ext/cppjieba_rb/../cppjieba/deps/limonp/StringUtil.hpp:101:70: warning: 'bind2nd<std::__1::equal_to<char>, char>' is deprecated [-Wdeprecated-declarations]
s.erase(s.begin(), std::find_if(s.begin(), s.end(), std::not1(std::bind2nd(std::equal_to<char>(), x))));
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/functional:1079:1: note: 'bind2nd<std::__1::equal_to<char>, char>' has been explicitly marked deprecated here
_LIBCPP_DEPRECATED_IN_CXX11 inline _LIBCPP_INLINE_VISIBILITY
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/__config:1101:39: note: expanded from macro '_LIBCPP_DEPRECATED_IN_CXX11'
# define _LIBCPP_DEPRECATED_IN_CXX11 _LIBCPP_DEPRECATED
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/__config:1090:48: note: expanded from macro '_LIBCPP_DEPRECATED'
# define _LIBCPP_DEPRECATED __attribute__ ((deprecated))
^
In file included from internal.cc:8:
In file included from /Library/Ruby/Gems/2.6.0/gems/cppjieba_rb-0.3.3/ext/cppjieba_rb/../cppjieba/include/cppjieba/Jieba.hpp:4:
In file included from /Library/Ruby/Gems/2.6.0/gems/cppjieba_rb-0.3.3/ext/cppjieba_rb/../cppjieba/include/cppjieba/QuerySegment.hpp:8:
In file included from /Library/Ruby/Gems/2.6.0/gems/cppjieba_rb-0.3.3/ext/cppjieba_rb/../cppjieba/include/cppjieba/DictTrie.hpp:13:
/Library/Ruby/Gems/2.6.0/gems/cppjieba_rb-0.3.3/ext/cppjieba_rb/../cppjieba/deps/limonp/StringUtil.hpp:106:61: warning: 'bind2nd<std::__1::equal_to<char>, char>' is deprecated [-Wdeprecated-declarations]
s.erase(std::find_if(s.rbegin(), s.rend(), std::not1(std::bind2nd(std::equal_to<char>(), x))).base(), s.end());
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/functional:1079:1: note: 'bind2nd<std::__1::equal_to<char>, char>' has been explicitly marked deprecated here
_LIBCPP_DEPRECATED_IN_CXX11 inline _LIBCPP_INLINE_VISIBILITY
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/__config:1101:39: note: expanded from macro '_LIBCPP_DEPRECATED_IN_CXX11'
# define _LIBCPP_DEPRECATED_IN_CXX11 _LIBCPP_DEPRECATED
^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/__config:1090:48: note: expanded from macro '_LIBCPP_DEPRECATED'
# define _LIBCPP_DEPRECATED __attribute__ ((deprecated))
^
6 warnings and 3 errors generated.
make: *** [internal.o] Error 1
make failed, exit code 2
Gem files will remain installed in /Library/Ruby/Gems/2.6.0/gems/cppjieba_rb-0.3.3 for inspection.
Results logged to /Library/Ruby/Gems/2.6.0/extensions/universal-darwin-19/2.6.0/cppjieba_rb-0.3.3/gem_make.out你解决这个问题了吗？我在从 bash 切换到 zsh 时遇到了同样的问题，当时忘记配置 rbenv。重新使用 rbenv 后，一切恢复正常。
macOS 上的系统 Ruby 似乎时不时会出问题。
我没搞明白。你在运行 Discourse 依赖安装脚本时，除了安装 rbenv 还做了其他操作吗？我只做了这些，因为脚本里没有其他说明。
我的开发环境很久以前就配置好了，所以我不太确定。我当时应该没有做其他操作，但也许 macOS 之后有了变化。
你可以检查一下 rbenv 是否已配置……如果你运行 nano ~/.bash_profile，应该会看到类似以下内容：
# load rbenv
export PATH="$HOME/.rbenv/bin:$PATH"
eval "$(rbenv init - --no-rehash)"
你还可以运行 rbenv versions 查看当前选中的版本（带星号的就是）。如果显示的是 system，你需要更改它……2.6.1 对我来说运行正常。（先运行 rbenv install 2.6.1，然后运行 rbenv global 2.6.1）