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Ruby Gem安装mysql报错( ruby版本2.4.1)
错误信息
执行gem install mysql后，出现如下报错：
$ gem install mysql
Building native extensions. This could take a while...
ERROR: Error installing mysql:
ERROR: Failed to build gem native extension.
current directory: /home/xxx/.rbenv/versions/2.4.1/lib/ruby/gems/2.4.0/gems/mysql-2.9.1/ext/mysql_api
/home/xxx/.rbenv/versions/2.4.1/bin/ruby -r ./siteconf20180722-25370-qcswvf.rb extconf.rb
checking for mysql_ssl_set()... yes
checking for rb_str_set_len()... yes
checking for rb_thread_start_timer()... no
checking for mysql.h... yes
creating Makefile
current directory: /home/xxx/.rbenv/versions/2.4.1/lib/ruby/gems/2.4.0/gems/mysql-2.9.1/ext/mysql_api
make "DESTDIR=" clean
current directory: /home/xxx/.rbenv/versions/2.4.1/lib/ruby/gems/2.4.0/gems/mysql-2.9.1/ext/mysql_api
make "DESTDIR="
compiling mysql.c
mysql.c: In function ‘stmt_bind_result’:
mysql.c:1320: error: ‘rb_cFixnum’ undeclared (first use in this function)
mysql.c:1320: error: (Each undeclared identifier is reported only once
mysql.c:1320: error: for each function it appears in.)
At top level:
cc1: warning: unrecognized command line option "-Wno-self-assign"
cc1: warning: unrecognized command line option "-Wno-constant-logical-operand"
cc1: warning: unrecognized command line option "-Wno-parentheses-equality"
cc1: warning: unrecognized command line option "-Wno-tautological-compare"
make: *** [mysql.o] Error 1
make failed, exit code 2
Gem files will remain installed in /home/xxx/.rbenv/versions/2.4.1/lib/ruby/gems/2.4.0/gems/mysql-2.9.1 for inspection.
Results logged to /home/xxx/.rbenv/versions/2.4.1/lib/ruby/gems/2.4.0/extensions/x86_64-linux/2.4.0-static/mysql-2.9.1/gem_make.out
解决办法
方法一：
由于myslq gem版本没有更新，不支持ruby2.4及以后版本，所以可以把ruby切换到2.3的版本。
方法二：
不使用mysql gem，使用更高效的驱动mysql2 gem。
gem install mysql2
