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What is a . h. gch file? - Stack Overflow A gch file is a precompiled header If a gch is not found then the normal header files will be used However, if your project is set to generate pre-compiled headers it will make them if they don’t exist and use them in the next build Sometimes the * h gch will get corrupted or contain outdated information, so deleting that file and compiling it again should fix it
c++ - Precompiled headers with GCC - Stack Overflow I tried it and i had the optimal use case for precompiled headers because my c source is compiler generated and not user written Sun Studio and especially Visual Studio improved the build time a lot On gcc it was getting even worse then without precompiled headers This was with 3 4 haven't testet with 4 x but speed and gcc is mutually exclusive
c++ - How to use . h. gch files - Stack Overflow Using GCH (Gnu preCompiled Headers) is easy, at least in theory How to create a GCH Just use gcc <compiler-options> myfile h That will create myfile h gch You can use the -o <name> to specify the name of the output file If your header file is C++, you will have to name it myfile hpp or myfile hh, or GCC will try to compile it as C and probably fail Alternatively you can use the -x c++
How to know if compiler is taking advantage of the pch. h. gch file? g++ -std=c++20 -Wall -O3 -flto pch h -o pch h gch But the generated file is always named as pch h and without the gch extension Why is this happening? It used to automatically add the extension But now it doesn't Edit: Another question is that, is it necessary to add an include guard (e g #pragma once) to the precompiled header?
c++ - Building precompiled header with GN - Stack Overflow I'm trying to write a GN file that generates gch files I've gone through the GN documentation here I just don't understand how to implement this, i am novice when it comes to GN So let me explain