MongoDB源码编译
本人编译的版本编译的版本为mongodb2.6分支，目前MongoDB3.0已经发布，编译步骤和2.6的差不多，不过3.0版本要求编译器支持c++11标准，所以如果是在Linux平台下编译，必须先升级GCC到4.8.2版本，在Windows下编译需要Visual Studio 2013 Update 2以上版本。
MongoDB源码下载地址: 源码下载
2.6版本源码编译使用Scons，所以需要准备以下软件:
Python 2.7.9 : 点此下载
Scons 2.3.4: 点此下载
Windos平台-VS2010以上版本: 点此下载
Linux平台-GCC: 点此下载
Windows下软件安装说明:
1, Python安装目录中不能有空格，也就是不能放在“Program Files”类似目录中，使用默认目录就可以。
2, Python安装完成后需要配置环境变量，在PATH后面增加”;D:\Python27”（此处根据自己目录配置）。
3, 先安装Python，然后安装Scons，安装完成后配置环境变量”;D:\Python27\Scripts”。
Windows下编译:
开始菜单中找到Visual Studio Tools，然后打开VS2013 x64 Native Tools Command Prompt(VS2013 x64 本机工具命令提示)，cd到源码目录，然后输入“scons all –64 -j4”即可开始编译， 如果只是需要MongoDB中某个模块，则可以”scons mongod –64 -j4”。
说明:
1, 源码不要放在中文目录下面，这个是我个人编译时候犯的错误，导致编译时候出现”C++ compiler $CC does not work”错误，不知道和我自己电脑有没有关系。
2, 在Windows上编译2.6版本时需要加上”–64”命令，否则会出现”error : You cannot use 32-bit time_t (_USE_32BIT_TIME_T) with _WIN64”错误，这个是MongoDB的BUG，点此查看
3, “-j4”命令是为了加快编译速度，“4”问自己电脑CPU数量，这个命令使用多进程编译。
Linux下软件安装说明:
笔者个人为电脑为Centos6，默认已经安装Python，只需要升级就行，我自己下载了Python源码然后编译升级。
1, Python编译升级: 在终端中cd到Python源码目录，运行./configure, 再运行make install即可。
2, Scons安装: 在终端中cd到Scons目录，运行”python setup.py install”即可。
Linux下编译:
在终端中cd到MongoDB源码目录，然后直接运行“scons all –64 -j4”即可。
说明:
1, 如果是使用“all”命令编译，则源码所在目录挂载的分区内存最好大于30G，不然会编译一半提示内存不足而终止。
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