はじめに

新しくrailsプロジェクト作成の際に、

俺「railsインストールしてrails newしたし、次はbundle installだ」

と思い$ bundleしたのですが、がっつりエラーが発生しました。

結構時間が取られてしまったので（二日間くらい悩みましたw）、備忘録として対応方法を記載しておきたいと思います。

起こったこと

$ bundleすると、下記の様なエラーが出た。

$ bundle
（省略）
Bundler could not find compatible versions for gem "sprockets":
  In snapshot (Gemfile.lock):
    sprockets (= 4.0.0)

  In Gemfile:
    sass-rails (~> 5.0) was resolved to 5.1.0, which depends on
      sprockets (>= 2.8, < 4.0)

    rails (~> 5.2.3) was resolved to 5.2.3, which depends on
      sprockets-rails (>= 2.0.0) was resolved to 3.2.1, which depends on
        sprockets (>= 3.0.0)

Running `bundle update` will rebuild your snapshot from scratch, using only
the gems in your Gemfile, which may resolve the conflict.

そんなことよりコマンドだけ教えて

$ brew info openssl
（省略）
For compilers to find openssl@1.1 you may need to set:
  export LDFLAGS="-L/usr/local/opt/openssl@1.1/lib"
  export CPPFLAGS="-I/usr/local/opt/openssl@1.1/include"

exportで出たPATHを設定して、mysql2をインストールする。

$ bundle config --local build.mysql2 "--with-cppflags=-I/usr/local/opt/openssl@1.1/include"
$ bundle config --local build.mysql2 "--with-ldflags=-L/usr/local/opt/openssl@1.1/lib"
$ bundle install

これで出来ます！

やってみたこと

１、とりあえずエラー文に従ってコマンド打ってみる

「$ bundle update」

上記のエラー文より、bundle updateしろとのことなのでやってみる。

$ bundle update
（省略）
Gem::Ext::BuildError: ERROR: Failed to build gem native extension.

current directory:
/Users/ginokinh/workplace/insta_clone/vendor/bundle/ruby/2.6.0/gems/mysql2-0.5.2/ext/mysql2
/Users/ginokinh/.rbenv/versions/2.6.4/bin/ruby -I
/Users/ginokinh/.rbenv/versions/2.6.4/lib/ruby/2.6.0 -r ./siteconf20191126-13836-1jt97r2.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/opt/mysql@5.7/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... 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/opt/mysql@5.7/lib
-----
creating Makefile

current directory:
/Users/ginokinh/workplace/insta_clone/vendor/bundle/ruby/2.6.0/gems/mysql2-0.5.2/ext/mysql2
make "DESTDIR=" clean

current directory:
/Users/ginokinh/workplace/insta_clone/vendor/bundle/ruby/2.6.0/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/ginokinh/workplace/insta_clone/vendor/bundle/ruby/2.6.0/gems/mysql2-0.5.2 for
inspection.
Results logged to
/Users/ginokinh/workplace/insta_clone/vendor/bundle/ruby/2.6.0/extensions/x86_64-darwin-19/2.6.0/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

「gem install mysql2 -v '0.5.2' --source 'https://rubygems.org/'」する。

$ gem install mysql2 -v '0.5.2' --source 'https://rubygems.org/'
Fetching mysql2-0.5.2.gem
Building native extensions. This could take a while...
ERROR: Error installing mysql2:
ERROR: Failed to build gem native extension.

current directory: /Users/ginokinh/.rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/mysql2-0.5.2/ext/mysql2
/Users/ginokinh/.rbenv/versions/2.6.4/bin/ruby -I /Users/ginokinh/.rbenv/versions/2.6.4/lib/ruby/2.6.0 -r ./siteconf20191126-18347-15yfju7.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/opt/mysql@5.7/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... 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/opt/mysql@5.7/lib
-----
creating Makefile

current directory: /Users/ginokinh/.rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/mysql2-0.5.2/ext/mysql2
make "DESTDIR=" clean

current directory: /Users/ginokinh/.rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/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/ginokinh/.rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/gems/mysql2-0.5.2 for inspection.
Results logged to /Users/ginokinh/.rbenv/versions/2.6.4/lib/ruby/gems/2.6.0/extensions/x86_64-darwin-19/2.6.0/mysql2-0.5.2/gem_make.out

これでも出来ない。。。環境構築でのエラーかぁ。。。苦手意識が出てきましたが、ここからいろいろ調べて試してみる。

２、いろいろ調べて試してみる。

https://github.com/brianmario/mysql2/issues/1005

↑ 「Homebrewにopensslのインストールしないと使えないよ！」 って書いてあったので、

$ brew install openssl

次に、 mysql2 gemインストール時のトラブルシュート

このサイトで、opensslのライブラリの場所を指定してgemをインストールできればいいとのことなので、

$ brew info openssl
openssl@1.1: stable 1.1.1d (bottled) [keg-only]
Cryptography and SSL/TLS Toolkit
https://openssl.org/
/usr/local/Cellar/openssl@1.1/1.1.1d (7,983 files, 17.9MB)
  Poured from bottle on 2019-10-19 at 11:10:10
From: https://github.com/Homebrew/homebrew-core/blob/master/Formula/openssl@1.1.rb
==> Caveats
A CA file has been bootstrapped using certificates from the system
keychain. To add additional certificates, place .pem files in
  /usr/local/etc/openssl@1.1/certs

and run
  /usr/local/opt/openssl@1.1/bin/c_rehash

openssl@1.1 is keg-only, which means it was not symlinked into /usr/local,
because openssl/libressl is provided by macOS so don't link an incompatible version.

If you need to have openssl@1.1 first in your PATH run:
  echo 'export PATH="/usr/local/opt/openssl@1.1/bin:$PATH"' >> ~/.bash_profile

For compilers to find openssl@1.1 you may need to set:
  export LDFLAGS="-L/usr/local/opt/openssl@1.1/lib"
  export CPPFLAGS="-I/usr/local/opt/openssl@1.1/include"

For pkg-config to find openssl@1.1 you may need to set:
  export PKG_CONFIG_PATH="/usr/local/opt/openssl@1.1/lib/pkgconfig"

==> Analytics
install: 514,827 (30 days), 1,802,993 (90 days), 2,294,743 (365 days)
install_on_request: 42,646 (30 days), 137,368 (90 days), 414,016 (365 days)
build_error: 0 (30 days)

注目すべきはここの部分！

  export LDFLAGS="-L/usr/local/opt/openssl@1.1/lib"
  export CPPFLAGS="-I/usr/local/opt/openssl@1.1/include"

この$PATHを設定してmysql2をインストールすれば良い。

$ bundle config --local build.mysql2 "--with-cppflags=-I/usr/local/opt/openssl@1.1/include"
$ bundle config --local build.mysql2 "--with-ldflags=-L/usr/local/opt/openssl@1.1/lib"

あとは、bundle installする！

$ bundle install
（省略）
Running `bundle update` will rebuild your snapshot from scratch, using only
the gems in your Gemfile, which may resolve the conflict.

また、エラー出たと思いましたが、ちゃんと出来た！

$ bundle update

無事出来た！！

補足

$ bundle config --local build.mysql2 "--with-cppflags=-I/usr/local/opt/openssl@1.1/include --with-ldflags=-L/usr/local/opt/openssl@1.1/lib"

と、オプションを2つつけると通らないみたいなのです。

参考サイト： bundle install 時、mysql2でエラー

ginokinのブログ " ろぐ "

【rails new】mysql2が`bundle install`出来ない時のエラー解決法