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I've noticed long compilation times... How to do precompiled headers on Windows?
By Qualified, history, 6 years ago, In English

The title says it all...

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6 years ago, hide # |
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First, navigate to the stdc++.h file. This will be located at a directory similar to C:\MinGW\lib\gcc\mingw32\6.3.0\include\c++\mingw32\bits. Right click while pressing Shift to open a Powershell/cmd window there. Run the command g++ -std=c++17 stdc++.h, to compile the header. Take care to use the same flags you used in your build system(i.e use c++14 in command if you have build up of c++14). Check to make sure that the stdc++.h.gch file was created in the directory. Also,use "bits/stdc++.h" instead of <bits/stdc++.h> in header

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    6 years ago, hide # ^ |
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    Thanks, man! This is so fast! BTW, <bits/stdc++.h> runs in the same time as "bits/stdc++.h" so what is the difference?

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      6 years ago, hide # ^ |
       
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      Actually I have read in this blog Link,according to this "bits/stdc++.h" use precompiled headers whereas <bits/stdc++.h> doesn't. IDK what's actual mechanism happening but in my case "bits/stdc++.h" working very good so I recommend that.

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        6 years ago, hide # ^ |
         
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        'Take care to use the flags' what is this step mean ? And how can I be sure that I'm using the precompiled headers rajkumar62506

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          6 years ago, hide # ^ |
           
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          1)take care of flags means which c++ version you are using.if you are using c++14 then run command will be g++ -std=c++14 stdc++.h. 2)This info you can find on google by reading few blogs,once I was searching about precompiling header I was found it but I was not understood.But I can easily detect it by huge difference in compiling time.

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      6 years ago, hide # ^ |
       
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      click

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    5 years ago, hide # ^ |
     
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    When I try to compile it using command prompt, I get this error "The term 'g++' is not recognized as the name of a cmdlet, function, script file...". Any solution?

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    5 years ago, hide # ^ |
     
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    I compiled the header, but .gch is not created. Any solution?

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6 years ago, hide # |
 
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For Linux Users
For Windows Users

Then run this command g++ -std=c++17 stdc++.h in your terminal or cmd, it will create stdc++.h.gch file. That's all. It will boost your compile time 8x faster.

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