在 Ruby 1.9.2 中基于 CentOS 64 位安装 rubygem 'mysql2'时出现编译器错误

Question

一个CentOS 64位带有Ruby 1.8.7&1.9.2

{没有RVM，需要它没有RVM。。。目前所有的Ruby1.9.2二进制文件都是ruby19并且类似地可访问，因此没有gem路径或任何类似的映射｝｝

安装gem'mysql2'时出错。。。

我安装了所有依赖项，并且都是64位版本。。。

所有错误都属于{./client.h:13:错误：typedef的重新定义'rb_unblock_function_t'｝

无法｛#warning-rubysig.h已过时｝是原因吗？

控制台捕获：

#gem19 install mysql2 -v 0.2.7 -- --with-mysql-dir=/usr/bin --with-mysql-config=/usr/bin/mysql_config --with-mysql-include=/usr/include/mysql
Building native extensions.  This could take a while...
ERROR:  Error installing mysql2:
        ERROR: Failed to build gem native extension.
/usr/bin/ruby19 extconf.rb --with-mysql-dir=/usr/bin --with-mysql-config=/usr/bin/mysql_config --with-mysql-include=/usr/include/mysql
checking for rb_thread_blocking_region()... no
checking for mysql.h... yes
checking for errmsg.h... yes
checking for mysqld_error.h... yes
creating Makefile
make
gcc -I. -I/usr/include/ruby-1.9.1/x86_64-linux -I/usr/include/ruby-1.9.1/ruby/backward -I/usr/include/ruby-1.9.1 -I. -DHAVE_MYSQL_H -DHAVE_ERRMSG_H -DHAVE_MYSQLD_ERROR_H    -I/usr/include/mysql  -g -pipe -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -D_GNU_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -fno-strict-aliasing -fwrapv -fPIC -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -mtune=generic -Wall -fno-strict-aliasing -fPIC -Wall -funroll-loops  -o result.o -c result.c
In file included from ./client.h:11,
                 from ./mysql2_ext.h:39,
                 from result.c:1:
/usr/include/ruby-1.9.1/ruby/backward/rubysig.h:14:2: warning: #warning rubysig.h is obsolete
In file included from ./mysql2_ext.h:39,
                 from result.c:1:
./client.h:13: error: redefinition of typedef ‘rb_unblock_function_t’
/usr/include/ruby-1.9.1/ruby/intern.h:754: error: previous declaration of ‘rb_unblock_function_t’ was here
./client.h:14: error: redefinition of typedef ‘rb_blocking_function_t’
/usr/include/ruby-1.9.1/ruby/intern.h:755: error: previous declaration of ‘rb_blocking_function_t’ was here
./client.h:20: error: static declaration of ‘rb_thread_blocking_region’ follows non-static declaration
/usr/include/ruby-1.9.1/ruby/intern.h:759: error: previous declaration of ‘rb_thread_blocking_region’ was here
./client.h: In function ‘rb_thread_blocking_region’:
./client.h:23: warning: ‘rb_thread_blocking_region_begin’ is deprecated (declared at /usr/include/ruby-1.9.1/ruby/backward/rubysig.h:31)
./client.h:25: warning: ‘rb_thread_blocking_region_end’ is deprecated (declared at /usr/include/ruby-1.9.1/ruby/backward/rubysig.h:32)
In file included from ./mysql2_ext.h:39,
                 from result.c:1:
./client.h:41:7: warning: no newline at end of file
make: *** [result.o] Error 1

Answer 1

这是由于他们在gem上引入了一个补丁，以便在Ruby 1.8中运行，但在Ruby 1.9上不需要它。

要停用这个"修复程序"并能够安装gem，您可以为编译器定义一个标志：

gem install mysql2 -- --with-cflags="-DHAVE_RB_THREAD_BLOCKING_REGION"

Answer 2

问题出现在extconf/mkmf部分：

rb_thread_blocking_region（）。。。无

但是Ruby 1.9.2定义了rb_thread_blocking_region（除非您构建了Ruby有一些我不知道的时髦的ifdef和编辑）。

检查您的mkmf.log文件。它应该表明Ruby失败了编译/链接用于测试的conftest.c文件rb_thread_blocking_region。原因是libcrypt.a对libfreebl3有依赖关系，但库没有在链接线上引用。

我通过编辑/usr/local/lib/rube/1.9.1/i686-linux/rbconfig.rb修复了这个问题，如下所示：

-  CONFIG["LIBS"] = "-lpthread -lrt -ldl -lcrypt -lm "
+  CONFIG["LIBS"] = "-lpthread -lrt -ldl -lcrypt -lfreebl3 -lm "

之后，我能够构建mysql2 gem。无需安装rvm等。

Answer 3

我修复它的方法是通过RVM重新安装Ruby。之后就再也没有错误了。

或者，删除client.h中试图为Ruby 1.8模拟rb_thread_blocking_region的块，就可以开始了。