无法在 RHEL 7 上为 MariaDB 连接安装 gem mysql2

Question

我在 Ruby 上有一个客户网站运行，在他们决定升级到 MariaDB 之前正在使用 MySQL。因此，我必须重新配置网站以使用新数据库

服务器：RHEL 7

数据库：MariaDB 10.2

安装 gem 时出现此错误。

ERROR:  Error installing mysql2:
ERROR: Failed to build gem native extension.

/usr/local/rvm/rubies/ruby-1.9.3-p551/bin/ruby -r ./siteconf20180305-7942-1ltzloc.rb extconf.rb
    checking for rb_absint_size()... no

    checking for rb_absint_singlebit_p()... no
    checking for ruby/thread.h... no
    checking for rb_thread_blocking_region()... yes
    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/bin/mysql_config
    -----
    checking for mysql.h... yes
    checking for errmsg.h... yes
    checking for SSL_MODE_DISABLED in mysql.h... no
    checking for MYSQL_OPT_SSL_ENFORCE in mysql.h... yes
    checking for MYSQL.net.vio in mysql.h... no
    checking for MYSQL.net.pvio in mysql.h... yes
    checking for MYSQL_ENABLE_CLEARTEXT_PLUGIN in mysql.h... yes
    -----
    Setting libpath to /usr/lib64/
    -----
    creating Makefile

    make  clean
    make
    compiling statement.c
    statement.c: In function ârb_raise_mysql2_stmt_errorâ:
    statement.c:50:3: warning: ISO C90 forbids mixed declarations and code [-Wdeclaration-after-statement]
       VALUE rb_error_msg = rb_str_new2(mysql_stmt_error(stmt_wrapper->stmt));
       ^
    statement.c:57:3: warning: ISO C90 forbids mixed declarations and code [-Wdeclaration-after-statement]
       rb_encoding *default_internal_enc = rb_default_internal_encoding();
       ^
    In file included from ./mysql2_ext.h:35:0,
       from statement.c:1:
    statement.c: In function âexecuteâ:
    ./client.h:56:3: warning: ISO C90 forbids mixed declarations and code [-Wdeclaration-after-statement]
       mysql_client_wrapper *wrapper; \
       ^
    statement.c:273:3: note: in expansion of macro âGET_CLIENTâ
       GET_CLIENT(stmt_wrapper->client);
       ^
    statement.c:405:13: warning: ISO C90 forbids mixed declarations and code [-Wdeclaration-after-statement]
         VALUE rb_val_as_string = rb_funcall(argv[i], intern_to_s, 0);
         ^
    In file included from ./mysql2_ext.h:35:0,
                     from statement.c:1:
    statement.c: In function âfieldsâ:
    ./client.h:56:3: warning: ISO C90 forbids mixed declarations and code [-Wdeclaration-after-statement]
       mysql_client_wrapper *wrapper; \
       ^
    statement.c:481:3: note: in expansion of macro âGET_CLIENTâ
       GET_CLIENT(stmt_wrapper->client);
       ^
    compiling result.c
    result.c: In function ârb_mysql_result_alloc_result_buffersâ:
    result.c:326:40: warning: assignment from incompatible pointer type [enabled by default]
         wrapper->result_buffers[i].is_null = &wrapper->is_null[i];
                                            ^
    result.c:328:40: warning: assignment from incompatible pointer type [enabled by default]
         wrapper->result_buffers[i].error   = &wrapper->error[i];
                                            ^
    compiling mysql2_ext.c
    compiling client.c
    In file included from ./mysql2_ext.h:35:0,
                     from client.c:1:
    client.c: In function ârb_set_ssl_mode_optionâ:
    ./client.h:56:3: warning: ISO C90 forbids mixed declarations and code [-Wdeclaration-after-statement]
       mysql_client_wrapper *wrapper; \
       ^
    client.c:118:3: note: in expansion of macro âGET_CLIENTâ
       GET_CLIENT(self);
       ^
    client.c:119:3: warning: ISO C90 forbids mixed declarations and code [-Wdeclaration-after-statement]
       int val = NUM2INT( setting );
       ^
    client.c:145:1: warning: control reaches end of non-void function [-Wreturn-type]
     }
     ^
    compiling infile.c
    linking shared-object mysql2/mysql2.so
    /usr/bin/ld: cannot find -lmariadb
    collect2: error: ld returned 1 exit status
    make: *** [mysql2.so] Error 1

    make failed, exit code 2

    Gem files will remain installed in /usr/local/rvm/gems/ruby-1.9.3-p551/gems/mysql2-0.4.10 for inspection.
    Results logged to /usr/local/rvm/gems/ruby-1.9.3-p551/extensions/x86_64-linux/1.9.1/mysql2-0.4.10/gem_make.out

不知道是服务器的问题还是数据库的问题。

Answer 1

OP 的解决方案。

我可以通过将 MariaDB 版本降级到 10.1 来安装 mysql2 gem。目前，gem 本身（版本 0.4）中存在与此相关的问题来源：Issue #877, Issue #932 要么我等待 gem 的下一个版本，要么我将数据库降级到较低版本。

mysql2 版本 0.4.10 应与 MariaDB 10.2

一起使用

无法在 RHEL 7 上为 MariaDB 连接安装 gem mysql2

Unable to install gem mysql2 on RHEL 7 for MariaDB connection

ruby

compatibility

rubygems

ruby-on-rails

mariadb