无法在Mac OS X上安装mysql gem
我使用http://dev.mysql.com/downloads/mysql中的安装程序安装了MySQL服务器。 然后，正如几个指南中所解释的那样，我想用以下命令安装mysql gem。
sudo gem install mysql 这不起作用，并给出以下输出。
Building native extensions. This could take a while... ERROR: Error installing mysql: ERROR: Failed to build gem native extension. /Users/luzi/.rvm/rubies/ruby-1.9.3-p429/bin/ruby extconf.rb --with-mysql-dir=/usr/local/mysql/ checking for mysql_ssl_set()... *** extconf.rb failed *** Could not create Makefile due to some reason, probably lack of necessary libraries and/or headers. Check the mkmf.log file for more details. You may need configuration options. Provided configuration options: --with-opt-dir --with-opt-include --without-opt-include=${opt-dir}/include --with-opt-lib --without-opt-lib=${opt-dir}/lib --with-make-prog --without-make-prog --srcdir=. --curdir --ruby=/Users/luzi/.rvm/rubies/ruby-1.9.3-p429/bin/ruby --with-mysql-config --without-mysql-config /Users/luzi/.rvm/rubies/ruby-1.9.3-p429/lib/ruby/1.9.1/mkmf.rb:381:in `try_do': The compiler failed to generate an executable file. (RuntimeError) You have to install development tools first. from /Users/luzi/.rvm/rubies/ruby-1.9.3-p429/lib/ruby/1.9.1/mkmf.rb:461:in `try_link0' from /Users/luzi/.rvm/rubies/ruby-1.9.3-p429/lib/ruby/1.9.1/mkmf.rb:476:in `try_link' from /Users/luzi/.rvm/rubies/ruby-1.9.3-p429/lib/ruby/1.9.1/mkmf.rb:619:in `try_func' from /Users/luzi/.rvm/rubies/ruby-1.9.3-p429/lib/ruby/1.9.1/mkmf.rb:894:in `block in have_func' from /Users/luzi/.rvm/rubies/ruby-1.9.3-p429/lib/ruby/1.9.1/mkmf.rb:790:in `block in checking_for' from /Users/luzi/.rvm/rubies/ruby-1.9.3-p429/lib/ruby/1.9.1/mkmf.rb:284:in `block (2 levels) in postpone' from /Users/luzi/.rvm/rubies/ruby-1.9.3-p429/lib/ruby/1.9.1/mkmf.rb:254:in `open' from /Users/luzi/.rvm/rubies/ruby-1.9.3-p429/lib/ruby/1.9.1/mkmf.rb:284:in `block in postpone' from /Users/luzi/.rvm/rubies/ruby-1.9.3-p429/lib/ruby/1.9.1/mkmf.rb:254:in `open' from /Users/luzi/.rvm/rubies/ruby-1.9.3-p429/lib/ruby/1.9.1/mkmf.rb:280:in `postpone' from /Users/luzi/.rvm/rubies/ruby-1.9.3-p429/lib/ruby/1.9.1/mkmf.rb:789:in `checking_for' from /Users/luzi/.rvm/rubies/ruby-1.9.3-p429/lib/ruby/1.9.1/mkmf.rb:893:in `have_func' from extconf.rb:45:in `' Gem files will remain installed in /Users/luzi/.rvm/gems/ruby-1.9.3-p429/gems/mysql-2.9.1 for inspection. Results logged to /Users/luzi/.rvm/gems/ruby-1.9.3-p429/gems/mysql-2.9.1/ext/mysql_api/gem_make.out
我重新安装了ruby 1.9.3几次。 还安装了XCode命令行实用程序。 我也用自制软件安装了mysql服务器（没带任何东西）。
我还尝试了上面命令的一些选项，比如--with-mysql-dir=/usr/local/mysql和--with-mysql-config=/usr/local/mysql/bin/mysql_config 。 sudo env ARCHFLAGS="-arch x86_64" gem install mysql标志（ sudo env ARCHFLAGS="-arch x86_64" gem install mysql ）也没有帮助。
更新 ：
我也尝试过mysql2 gem，出现相同错误的结果，可能是因为mysql2 gem依赖于mysql gem。
更新2 ：
mkmf.log内容：
"/opt/local/bin/gcc-apple-4.2 -o conftest -I/Users/luzi/.rvm/rubies/ruby-1.9.3-p429/include/ruby-1.9.1/x86_64-darwin12.4.0 -I/Users/luzi/.rvm/rubies/ruby-1.9.3-p429/include/ruby-1.9.1/ruby/backward -I/Users/luzi/.rvm/rubies/ruby-1.9.3-p429/include/ruby-1.9.1 -I. -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE -I/opt/local/include -I/usr/local/mysql/include -Wno-null-conversion -Os -g -fno-strict-aliasing -arch x86_64 -O3 -ggdb -Wall -Wextra -Wno-unused-parameter -Wno-parentheses -Wno-long-long -Wno-missing-field-initializers -Wpointer-arith -Wwrite-strings -Wdeclaration-after-statement -Wshorten-64-to-32 -Wimplicit-function-declaration -fno-common -pipe conftest.c -L. -L/Users/luzi/.rvm/rubies/ruby-1.9.3-p429/lib -L/opt/local/lib -L. -L/usr/local/lib -L/opt/local/lib -L/usr/local/mysql/lib -lmysqlclient -lruby.1.9.1 -lpthread -ldl -lobjc " cc1: error: unrecognized command line option "-Wno-null-conversion" checked program was: /* begin */ 1: #include "ruby.h" 2: 3: int main(int argc, char **argv) 4: { 5: return 0; 6: } /* end */
这里解释了这个问题： http ： //www.randomactsofsentience.com/2013/05/gem-install-mysql2-missing-mysqlh-on-os.html 。 简而言之：
在第120行更改文件/usr/local/mysql/bin/mysql_config
cflags="-I$pkgincludedir -Wall -Wno-null-conversion -Wno-unused-private-field -Os -g -fno-strict-aliasing -DDBUG_OFF -arch x86_64 " #note: end space! cxxflags="-I$pkgincludedir -Wall -Wno-null-conversion -Wno-unused-private-field -Os -g -fno-strict-aliasing -DDBUG_OFF -arch x86_64 " #note: end space!
至
cflags="-I$pkgincludedir -Wall -Os -g -fno-strict-aliasing -DDBUG_OFF -arch x86_64 " #note: end space! cxxflags="-I$pkgincludedir -Wall -Os -g -fno-strict-aliasing -DDBUG_OFF -arch x86_64 " #note: end space!
问题不在于gem本身。 您缺少XCode（从AppStore安装），也可能是https://github.com/kennethreitz/osx-gcc-installer，因为您的错误日志说：
您必须首先安装开发工具。
为了更好地解释问题，请查看错误日志建议的mkmf.log。
我在Fedora 21上安装mysql2psql时遇到问题，我通过从mysql.org下载mysql source tar.gz并将–with-mysql-config设置为这个解压后的目录到bin / mysql_config文件来解决它
gem install mysql2psql – –with-mysql-config = / pathtodownloadedsource / mysql ../ bin / mysql_config