mysql2 版本 0.5.2 安装失败

Question

我正在尝试在我的 MacBook 运行 OSX 10.14.1 上安装 mysql2（版本 0.5.2）并使用 Rails 5.2.2。我已经使用 gem install mysql2 安装了它，但没有成功，但它在我的 gem 文件中为：

gem 'mysql2'

当我尝试安装 gem mysql2 时，出现以下错误：

Fetching mysql2 0.5.2
Installing mysql2 0.5.2 with native extensions
Gem::Ext::BuildError: ERROR: Failed to build gem native extension.

current directory:         /Users/lawrence/.rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/mysql2-    0.5.2/ext/mysql2
/Users/lawrence/.rbenv/versions/2.5.3/bin/ruby -r ./siteconf20181213-11829-    1fv4si0.rb extconf.rb
checking for rb_absint_size()... yes
checking for rb_absint_singlebit_p()... yes
checking for rb_wait_for_single_fd()... yes
-----
Using mysql_config at /usr/local/bin/mysql_config
-----
checking for mysql.h... yes
checking for errmsg.h... yes
checking for SSL_MODE_DISABLED in mysql.h... yes
checking for SSL_MODE_PREFERRED in mysql.h... yes
checking for SSL_MODE_REQUIRED in mysql.h... yes
checking for SSL_MODE_VERIFY_CA in mysql.h... yes
checking for SSL_MODE_VERIFY_IDENTITY in mysql.h... yes
checking for MYSQL.net.vio in mysql.h... yes
checking for MYSQL.net.pvio in mysql.h... no
checking for MYSQL_ENABLE_CLEARTEXT_PLUGIN in mysql.h... yes
checking for SERVER_QUERY_NO_GOOD_INDEX_USED in mysql.h... yes
checking for SERVER_QUERY_NO_INDEX_USED in mysql.h... yes
checking for SERVER_QUERY_WAS_SLOW in mysql.h... yes
checking for MYSQL_OPTION_MULTI_STATEMENTS_ON in mysql.h... yes
checking for MYSQL_OPTION_MULTI_STATEMENTS_OFF in mysql.h... yes
checking for my_bool in mysql.h... no
-----
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/8.0.12/lib
-----
creating Makefile

current directory:     /Users/lawrence/.rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/mysql2-    0.5.2/ext/mysql2
make "DESTDIR=" clean

current directory:     /Users/lawrence/.rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/mysql2-0.5.2/ext/mysql2
make "DESTDIR="
compiling client.c
compiling infile.c
compiling mysql2_ext.c
compiling result.c
compiling statement.c
linking shared-object mysql2/mysql2.bundle
ld: library not found for -lssl
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/lawrence/.rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/gems/mysql2-0.5.2 for inspection.
Results logged to     /Users/lawrence/.rbenv/versions/2.5.3/lib/ruby/gems/2.5.0/extensions/x86_64-    darwin-18/2.5.0-static/mysql2-0.5.2/gem_make.out
An error occurred while installing mysql2 (0.5.2), and Bundler cannot continue.
Make sure that `gem install mysql2 -v '0.5.2' --source 'https://rubygems.org/'` succeeds before bundling.

In Gemfile: mysql2

我该如何解决这个问题？

Answer 1

ld: library not found for -lssl 可能是罪魁祸首。

尝试brew install openssl。另外，查看了解更多信息。

编辑：对于未来的用户，这对我遇到类似问题很有效。确保将 -v 更改为所需的任何版本。我在 rails 4.2.x 所以用 0.4.10, Rails 5.x 会用 0.5.x.

gem install mysql2 -v '0.4.10' -- --with-ldflags=-L/usr/local/opt/openssl/lib --with-cppflags=-I/usr/local/opt/openssl/include

Answer 2

我找到了答案

Mojave 更改了编译 C 扩展所需的头文件的位置。您可能需要运行以下命令来安装 pg、mysql2、nokogiri 或其他需要 C 扩展的 gem：

sudo installer -pkg /Library/Developer/CommandLineTools/Packages/macOS_SDK_headers_for_macOS_10.14.pkg -target /

关注下面的 link 了解更多。

https://gorails.com/setup/osx/10.14-mojave

mysql2 版本 0.5.2 安装失败

mysql2 version 0.5.2 Installation Failed

ruby

openssl

rubygems

mysql2