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Qualified's blog

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...

  • Vote: I like it
  • +10
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  • Author Qualified
  • Publication date 6 years ago
  • Comments 22
Comments Comments (10) Show archived | Write comment?
» rajkumar62506 6 years ago, show (+1) #
» rajkumar62506 6 years ago, hide # | ← Rev. 2 → Vote: I like it 0 Vote: I do not like it

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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  • » » Qualified 6 years ago, show (+1) #
    » » Qualified 6 years ago, hide # ^ | ← Rev. 3 → Vote: I like it +1 Vote: I do not like it

    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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    • » » » rajkumar62506 6 years ago, show (+1) #
      » » » rajkumar62506 6 years ago, hide # ^ | Vote: I like it 0 Vote: I do not like it

      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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      • » » » » KiBie 6 years ago, show (+1) #
        » » » » KiBie 6 years ago, hide # ^ | Vote: I like it 0 Vote: I do not like it

        '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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        • » » » » » rajkumar62506 6 years ago, show #
          » » » » » rajkumar62506 6 years ago, hide # ^ | Vote: I like it 0 Vote: I do not like it

          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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    • » » » dush1729 6 years ago, show #
      » » » dush1729 6 years ago, hide # ^ | Vote: I like it 0 Vote: I do not like it

      click

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  • » » Tapojit047 4 years ago, show #
    » » Tapojit047 4 years ago, hide # ^ | Vote: I like it 0 Vote: I do not like it

    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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  • » » Tapojit047 4 years ago, show #
    » » Tapojit047 4 years ago, hide # ^ | Vote: I like it 0 Vote: I do not like it

    I compiled the header, but .gch is not created. Any solution?

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» ajitshiva007 5 years ago, show (+1) #
» ajitshiva007 5 years ago, hide # | Vote: I like it 0 Vote: I do not like it For Linux Users Go to /usr/include/x86_64-linux-gnu/c++/9/bits For Windows Users Go to C:\MinGW\lib\gcc\mingw32\6.3.0\include\c++\mingw32\bits 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. → Reply
  • » » BitSane 4 years ago, show #
    » » BitSane 4 years ago, hide # ^ | Vote: I like it 0 Vote: I do not like it

    Thanks a lot, I was searching for this in Ubuntu!

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