# mysql2(gem)の bundle install に失敗したときの対応📝

プロジェクト移るたびに失敗している気がするので、メモ。

実際にやる内容は、Rails で MySQL の bundle install エラー対処方 - Qiita と同じです・・・

# bundle install

bundle install すると失敗する。

$ bundle install --path vendor/bundle

...略...

Fetching mysql2 0.4.8
Installing mysql2 0.4.8 with native extensions
Gem::Ext::BuildError: ERROR: Failed to build gem native extension.

    current directory: /Users/username/project_name/vendor/bundle/ruby/2.5.0/gems/mysql2-0.4.8/ext/mysql2
/Users/username/.rbenv/versions/2.5.0/bin/ruby -r ./siteconf20200120-59594-1n4f5y8.rb extconf.rb
checking for rb_absint_size()... yes
checking for rb_absint_singlebit_p()... yes
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
checking for rb_big_cmp()... yes
-----
Using mysql_config at /usr/local/opt/mysql@5.6/bin/mysql_config
-----
checking for mysql.h... yes
checking for errmsg.h... yes
checking for mysqld_error.h... yes
checking for SSL_MODE_DISABLED in mysql.h... no
checking for MYSQL_OPT_SSL_ENFORCE in mysql.h... no
checking for MYSQL.net.vio in mysql.h... yes
checking for MYSQL.net.pvio 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/opt/mysql@5.6/lib
-----
creating Makefile

current directory: /Users/username/project_name/vendor/bundle/ruby/2.5.0/gems/mysql2-0.4.8/ext/mysql2
make "DESTDIR=" clean

current directory: /Users/username/project_name/vendor/bundle/ruby/2.5.0/gems/mysql2-0.4.8/ext/mysql2
make "DESTDIR="
compiling client.c
compiling infile.c
compiling mysql2_ext.c
compiling result.c
result.c:326:40: warning: incompatible pointer types assigning to 'my_bool *' (aka 'char *') from 'bool *' [-Wincompatible-pointer-types]
    wrapper->result_buffers[i].is_null = &wrapper->is_null[i];
                                       ^ ~~~~~~~~~~~~~~~~~~~~
result.c:328:40: warning: incompatible pointer types assigning to 'my_bool *' (aka 'char *') from 'bool *' [-Wincompatible-pointer-types]
    wrapper->result_buffers[i].error   = &wrapper->error[i];
                                       ^ ~~~~~~~~~~~~~~~~~~
2 warnings generated.
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/username/project_name/vendor/bundle/ruby/2.5.0/gems/mysql2-0.4.8 for inspection.
Results logged to /Users/username/project_name/vendor/bundle/ruby/2.5.0/extensions/x86_64-darwin-18/2.5.0-static/mysql2-0.4.8/gem_make.out

An error occurred while installing mysql2 (0.4.8), and Bundler cannot continue.
Make sure that `gem install mysql2 -v '0.4.8' --source 'https://rubygems.org/'` succeeds before bundling.

In Gemfile:
  mysql2

# ローカル設定

❯ bundle config --local build.mysql2 --with-opt-lib=/usr/local/opt/openssl/lib --with-opt-include=-I/usr/local/opt/openssl/include
You are replacing the current local value of build.mysql2, which is currently nil

# 再度 bundle install

問題なく bundle install できた。

$ bundle install --path vendor/bundle

# 参考🔗