在Debian Squeeze上安装mysql2 gem时出错

本文介绍了在Debian Squeeze上安装mysql2 gem时出错的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述 在Debian Squeeze上安装mysql2 gem时，我得到了这个受欢迎的错误：

gem install mysql2 Building本地扩展。这可能需要一段时间... 错误：安装mysql2时出错：错误：无法构建gem本机扩展。 /usr/local/rvm/rubies/ruby-1.9.2-p290/bin/ruby extconf.rb 检查rb_thread_blocking_region（）...是检查rb_wait_for_single_fd（）... no 检查mysql.h ...是检查errmsg.h ...是检查mysqld_error.h ...是创建Makefile make gcc -I。 -I / usr / local / rvm / rubies / ruby​​-1.9.2-p290 / include / ruby​​-1.9.1 / i686-linux -I / usr / local / rvm / rubies / ruby​​-1.9.2-p290 / include /ruby-1.9.1/ruby/backward -I / usr / local / rvm / rubies / ruby​​-1.9.2-p290 / include / ruby​​-1.9.1 -I。 -DHAVE_RB_THREAD_BLOCKING_REGION -DHAVE_MYSQL_H -DHAVE_ERRMSG_H -DHAVE_MYSQLD_ERROR_H -D_FILE_OFFSET_BITS = 64 -I / usr / include / mysql -DBIG_JOINS = 1 -fno-strict-aliasing -g -fPIC -O3 -ggdb -Wextra -Wno-unused-parameter -Wno-brackethes -Wpointer-arith -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -fPIC -Wall -funroll-loops -o client.o -c client.c gcc -I。 -I / usr / local / rvm / rubies / ruby​​-1.9.2-p290 / include / ruby​​-1.9.1 / i686-linux -I / usr / local / rvm / rubies / ruby​​-1.9.2-p290 / include /ruby-1.9.1/ruby/backward -I / usr / local / rvm / rubies / ruby​​-1.9.2-p290 / include / ruby​​-1.9.1 -I。 -DHAVE_RB_THREAD_BLOCKING_REGION -DHAVE_MYSQL_H -DHAVE_ERRMSG_H -DHAVE_MYSQLD_ERROR_H -D_FILE_OFFSET_BITS = 64 -I / usr / include / mysql -DBIG_JOINS = 1 -fno-strict-aliasing -g -fPIC -O3 -ggdb -Wextra -Wno-unused-parameter -Wno-brackethes -Wpointer-arith -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -fPIC -Wall -funroll-loops -o mysql2_ext.o -c mysql2_ext.c gcc -I。 -I / usr / local / rvm / rubies / ruby​​-1.9.2-p290 / include / ruby​​-1.9.1 / i686-linux -I / usr / local / rvm / rubies / ruby​​-1.9.2-p290 / include /ruby-1.9.1/ruby/backward -I / usr / local / rvm / rubies / ruby​​-1.9.2-p290 / include / ruby​​-1.9.1 -I。 -DHAVE_RB_THREAD_BLOCKING_REGION -DHAVE_MYSQL_H -DHAVE_ERRMSG_H -DHAVE_MYSQLD_ERROR_H -D_FILE_OFFSET_BITS = 64 -I / usr / include / mysql -DBIG_JOINS = 1 -fno-strict-aliasing -g -fPIC -O3 -ggdb -Wextra -Wno-unused-parameter -Wno-brackethes -Wpointer-arith -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -fPIC -Wall -funroll-loops -o result.o -c result.c result.c：In function 'rb_mysql_result_fetch_fields'： result.c：381：warning：有符号和无符号整数表达式之间的比较 gcc -shared -o mysql2.so client.o mysql2_ext.o result.o -L。 -L / usr / local / rvm / rubies / ruby​​-1.9.2-p290 / lib -Wl，-R / usr / local / rvm / rubies / ruby​​-1.9.2-p290 / lib -L。 -rdynamic -Wl，-export-dynamic -Wl，-rpath，/ usr / lib -Wl，-R -Wl，/ usr / local / rvm / rubies / ruby​​-1.9.2-p290 / lib -L ​​/ usr /本地/ rvm / rubies / ruby​​-1.9.2-p290 / lib -lruby -L / usr / lib -lmysqlclient_r -lpthread -lz -lm -lrt -lssl -lcrypto -ldl -lpthread -lrt -ldl -lcrypt -lm - lc / usr / bin / ld：找不到-lmysqlclient_r collect2：ld返回1退出状态 make：*** [mysql2.so]错误1 宝石文件将保留在/usr/local/rvm/gems/ruby-1.9.2-p290/gems/mysql2-0.3.11中进行检查。 结果记录到/usr/local/rvm/gems/ruby-1.9.2-p290/gems/mysql2-0.3.11/ext/mysql2/gem_make.out

在堆栈溢出中有很多搜索结果，但没有一个可以解决我的问题。

libmysqlclient-dev - MySQL数据库开发文件 libmysqlclient18 - MySQL数据库客户端库

是通过dot deb repo安装的。

还安装了mysql-server。

以下与libmysqlclient相关的文件可以在/ usr / lib

/usr/lib/libmysqlclient.so.18 / usr / lib / libmysqlclient_r /usr/lib/libmysqlclient.so /usr/lib/libmysqlclient.so.16.0.0 /usr/lib/libmysqlclient.a /usr/lib/libmysqlclient_r.so.16 /usr/lib/libmysqlclient.so.16 /usr/lib/libmysqlclient.so.18.0.0 /usr/lib/libmysqlclient_r.so.16.0.0

解决方案

看起来本机扩展的问题是缺少头文件（.h）它们通常位于 -dev 库中

code> sudo apt-get install libmysqlclient-dev gem install mysql2

解决Debian / Ubuntu的问题。

I got this "popular" error while installing mysql2 gem on Debian Squeeze:

gem install mysql2 Building native extensions. This could take a while... ERROR: Error installing mysql2: ERROR: Failed to build gem native extension. /usr/local/rvm/rubies/ruby-1.9.2-p290/bin/ruby extconf.rb checking for rb_thread_blocking_region()... yes checking for rb_wait_for_single_fd()... no checking for mysql.h... yes checking for errmsg.h... yes checking for mysqld_error.h... yes creating Makefile make gcc -I. -I/usr/local/rvm/rubies/ruby-1.9.2-p290/include/ruby-1.9.1/i686-linux -I/usr/local/rvm/rubies/ruby-1.9.2-p290/include/ruby-1.9.1/ruby/backward -I/usr/local/rvm/rubies/ruby-1.9.2-p290/include/ruby-1.9.1 -I. -DHAVE_RB_THREAD_BLOCKING_REGION -DHAVE_MYSQL_H -DHAVE_ERRMSG_H -DHAVE_MYSQLD_ERROR_H -D_FILE_OFFSET_BITS=64 -I/usr/include/mysql -DBIG_JOINS=1 -fno-strict-aliasing -g -fPIC -O3 -ggdb -Wextra -Wno-unused-parameter -Wno-parentheses -Wpointer-arith -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -fPIC -Wall -funroll-loops -o client.o -c client.c gcc -I. -I/usr/local/rvm/rubies/ruby-1.9.2-p290/include/ruby-1.9.1/i686-linux -I/usr/local/rvm/rubies/ruby-1.9.2-p290/include/ruby-1.9.1/ruby/backward -I/usr/local/rvm/rubies/ruby-1.9.2-p290/include/ruby-1.9.1 -I. -DHAVE_RB_THREAD_BLOCKING_REGION -DHAVE_MYSQL_H -DHAVE_ERRMSG_H -DHAVE_MYSQLD_ERROR_H -D_FILE_OFFSET_BITS=64 -I/usr/include/mysql -DBIG_JOINS=1 -fno-strict-aliasing -g -fPIC -O3 -ggdb -Wextra -Wno-unused-parameter -Wno-parentheses -Wpointer-arith -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -fPIC -Wall -funroll-loops -o mysql2_ext.o -c mysql2_ext.c gcc -I. -I/usr/local/rvm/rubies/ruby-1.9.2-p290/include/ruby-1.9.1/i686-linux -I/usr/local/rvm/rubies/ruby-1.9.2-p290/include/ruby-1.9.1/ruby/backward -I/usr/local/rvm/rubies/ruby-1.9.2-p290/include/ruby-1.9.1 -I. -DHAVE_RB_THREAD_BLOCKING_REGION -DHAVE_MYSQL_H -DHAVE_ERRMSG_H -DHAVE_MYSQLD_ERROR_H -D_FILE_OFFSET_BITS=64 -I/usr/include/mysql -DBIG_JOINS=1 -fno-strict-aliasing -g -fPIC -O3 -ggdb -Wextra -Wno-unused-parameter -Wno-parentheses -Wpointer-arith -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -fPIC -Wall -funroll-loops -o result.o -c result.c result.c: In function ‘rb_mysql_result_fetch_fields’: result.c:381: warning: comparison between signed and unsigned integer expressions gcc -shared -o mysql2.so client.o mysql2_ext.o result.o -L. -L/usr/local/rvm/rubies/ruby-1.9.2-p290/lib -Wl,-R/usr/local/rvm/rubies/ruby-1.9.2-p290/lib -L. -rdynamic -Wl,-export-dynamic -Wl,-rpath,/usr/lib -Wl,-R -Wl,/usr/local/rvm/rubies/ruby-1.9.2-p290/lib -L/usr/local/rvm/rubies/ruby-1.9.2-p290/lib -lruby -L/usr/lib -lmysqlclient_r -lpthread -lz -lm -lrt -lssl -lcrypto -ldl -lpthread -lrt -ldl -lcrypt -lm -lc /usr/bin/ld: cannot find -lmysqlclient_r collect2: ld returned 1 exit status make: *** [mysql2.so] Error 1 Gem files will remain installed in /usr/local/rvm/gems/ruby-1.9.2-p290/gems/mysql2-0.3.11 for inspection. Results logged to /usr/local/rvm/gems/ruby-1.9.2-p290/gems/mysql2-0.3.11/ext/mysql2/gem_make.out

There are a lot of search results at stack overflow but none of them would fix my Problem.

libmysqlclient-dev - MySQL database development files libmysqlclient18 - MySQL database client library

are installed via dot deb repo.

mysql-server is installed, too.

The following files related to libmysqlclient could be found at /usr/lib

/usr/lib/libmysqlclient.so.18 /usr/lib/libmysqlclient_r /usr/lib/libmysqlclient.so /usr/lib/libmysqlclient.so.16.0.0 /usr/lib/libmysqlclient.a /usr/lib/libmysqlclient_r.so.16 /usr/lib/libmysqlclient.so.16 /usr/lib/libmysqlclient.so.18.0.0 /usr/lib/libmysqlclient_r.so.16.0.0

解决方案

It seems the the problem with the native extensions is the lack of the header files (.h) They are typically found in the -dev libraries

sudo apt-get install libmysqlclient-dev gem install mysql2

solves the problem for Debian/Ubuntu.