MinGW“制造"开始很慢 [英] MinGW "make" starts very slowly
问题描述
经过一番痛苦和磨难，我设法安装了MinGW所需的一切，以便它们可以在非网络的计算机上工作.
After some pain and suffering, i managed to install everything necessary for MinGW to work on a computer not on the network.
它很好地工作了几天，但是现在我遇到了很长的延迟，在我发出"make"命令来构建项目之后，一切都开始发生.
It worked nicely for a couple days, but now I'm experiencing very long delays before anything starts to happen after i give the "make" command to build my project.
我尝试按照此处的建议禁用网络:为什么MinGW非常慢? 但这没有帮助.
I tried disabling the network, as suggested here: Why is MinGW very slow? But it didn't help.
请注意，并不是真正的编译/链接进度缓慢，但是这些进程的启动似乎要花很长时间. 5-10分钟.除非我刚刚做，否则它将在10到30秒内开始.
Note that it's not the actual compilation / linking progress that is slow, but the startup of those processes seems to take forever. 5-10 minutes. Except if i just did it, then it starts in 10-30 seconds.
我知道，过去将这些磁带装载到Commodore上需要花费更长的时间，但是多年来，我变得不耐烦了.
I know, it used to take a lot longer to load those tapes on Commodore, but over the years I have grown impatient.
有什么想法吗?
推荐答案
尝试执行make -r(没有隐式规则).对我来说，单个cpp文件的时间差是30秒到几分之一秒之间.
Try doing make -r (without implicit rules). For me it was a difference between 30 seconds and fraction of a second for single cpp file.
说明:
我很久以前就遇到了MinGW遇到的相同问题.我已经使用make -d进行了调查.显然，make为每个依赖关系文件使用了大量隐式规则-如果我的文件在de -r开关，我看不出任何区别).
I've had the same problem MinGW make long ago. I've used make -d to investigate. It was then obvious that make uses a gazillion of implicit rules for every dependency file - if my file had dep on shared_ptr.hpp then make checked for shared_ptr.hpp(o|c|cc|v|f|r|.. and dozens other combinations). Of course those files didn't exist. It looks like checking for file mod time/existence (when it doesn't really exist) on Windows platform is a lot slower than on Linux (becouse with Linux i didn't see any difference with/without -r switch).
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