未能安装旧 mysql2 gem

Question

我正在使用 Mac High Sierra。我正在使用 Ruby 2.2.1 和 RVM。我需要在 Rails 应用程序上将 mysql2 与此 Ruby 一起使用。我确实安装了 mysql 5.7。我确实安装了 xcode 和命令行工具。

我只是想让这个公司的应用程序在我的本地机器上运行。我知道我已经非常接近了，但是当我执行 bundle install 时出现最后一个错误当我到达 mysql2 gem:

时收到以下错误

Fetching mysql2 0.3.18
Installing mysql2 0.3.18 with native extensions
Gem::Ext::BuildError: ERROR: Failed to build gem native extension.

    current directory: /Users/ahayden/.rvm/gems/ruby-2.2.1/gems/mysql2-0.3.18/ext/mysql2
/Users/ahayden/.rvm/rubies/ruby-2.2.1/bin/ruby -r ./siteconf20180710-52515-2hjll8.rb extconf.rb
checking for ruby/thread.h... yes
checking for rb_thread_call_without_gvl() in ruby/thread.h... yes
checking for rb_thread_blocking_region()... no
checking for rb_wait_for_single_fd()... yes
checking for rb_hash_dup()... yes
checking for rb_intern3()... yes
-----
Using mysql_config at /usr/local/bin/mysql_config
-----
checking for mysql.h... yes
checking for errmsg.h... yes
checking for mysqld_error.h... yes
-----
Don't know how to set rpath on your system, if MySQL libraries are not in path mysql2 may not load
-----
-----
Setting libpath to /usr/local/Cellar/mysql-connector-c/6.1.11/lib
-----
creating Makefile

current directory: /Users/ahayden/.rvm/gems/ruby-2.2.1/gems/mysql2-0.3.18/ext/mysql2
make "DESTDIR=" clean

current directory: /Users/ahayden/.rvm/gems/ruby-2.2.1/gems/mysql2-0.3.18/ext/mysql2
make "DESTDIR="
compiling infile.c
compiling client.c
client.c:359:33: warning: implicit conversion loses integer precision: 'long' to 'unsigned int' [-Wshorten-64-to-32]
        elapsed_time = end_time - start_time;
                     ~ ~~~~~~~~~^~~~~~~~~~~~
client.c:1163:56: warning: implicit conversion loses integer precision: 'size_t' (aka 'unsigned long') to 'unsigned int' [-Wshorten-64-to-32]
  mysql2rb = mysql2_mysql_enc_name_to_rb(charset_name, charset_name_len);
             ~~~~~~~~~~~~~~~~~~~~~~~~~~~               ^~~~~~~~~~~~~~~~
2 warnings generated.
compiling mysql2_ext.c
compiling result.c
result.c:186:17: warning: comparison of integers of different signs: 'int' and 'unsigned long' [-Wsign-compare]
  for (i = 0; i < (len - 1); i++) {
              ~ ^  ~~~~~~~
1 warning generated.
linking shared-object mysql2/mysql2.bundle
ld: library not found for -l-lpthread
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [mysql2.bundle] Error 1

make failed, exit code 2

Gem files will remain installed in /Users/ahayden/.rvm/gems/ruby-2.2.1/gems/mysql2-0.3.18 for inspection.
Results logged to /Users/ahayden/.rvm/gems/ruby-2.2.1/extensions/x86_64-darwin-17/2.2.0/mysql2-0.3.18/gem_make.out

An error occurred while installing mysql2 (0.3.18), and Bundler cannot continue.
Make sure that `gem install mysql2 -v '0.3.18'` succeeds before bundling.

In Gemfile:
  mysql2

我试过只安装 mysql2 而没有特定的 gem 版本并且它可以工作，但它没有解决我的问题。它似乎归结为找不到库 -l-lpthread 的回溯底部。请帮忙，我一整天都在尝试这样做。

Answer 1

根据共享的描述，mysql 依赖项似乎无法安装。

首先我们需要“定位mysql_config”，然后将以下命令中的路径替换为该文件所在的位置。

gem install mysql2 -- --with-mysql-config=/usr/local/mysql/bin/mysql_config

Answer 2

这帮我修好了

gem install mysql2 -v '0.3.21' -- --with-cflags=\"-I/usr/local/opt/openssl/include\" --with-ldflags=\"-L/usr/local/opt/openssl/lib\"

安装 openssl 后

brew install openssl

未能安装旧 mysql2 gem

Failure to install old mysql2 gem

ruby-on-rails

ruby

rubygems

mysql2