![]() ![]() If different source files in your project use different sets of header files, consider moving the most common headers into the pch.h file. In this example, it translates to 3.5 seconds + linking time instead of 7.5 seconds + linking time: Modifying the contents of the main source file (but not the headers included from pch.h) will not require rebuilding the precompiled header file. Precompiling the headers also speed up partial rebuilds.The updated timing shows how precompiling the header file added extra 7.2 seconds at the beginning of the build, however the subsequent compilations of the regular source files were sped up more than 2x: The overall speedup will be greater for projects with more source files.Add “ echo %time” between the compiler invocations: Note how it now contains a line for precompiling pch.h. Build the project and open the updated batch file.Similarly to the regular Win32 projects, the pch.cpp file is needed because MSBuild does not build the header files directly. gch file, and will then load when building the regular source files, instead of actually parsing pch.h over and over. ![]() Add another source file called pch.cpp, include pch.h from it and set “ Precompiled Header” to “ Create” just for that file: This ensures that VisualGDB will first precompile pch.h file into a.Also set the precompiled file name to pch.h: Go to VS Project Properties -> C/C++ -> Precompiled Headers and set the Precompiled Header option to “ Use“.Update both source files to include the pch.h file that, in turn, includes the actual headers:.Create a new file called pch.h and copy the #include directives from either of the source files into it: Precompiled headers speed up the building of large projects by first precompiling a set of commonly used header files, and then simply loading it for each compiled file.If the project was larger, every source file using these header files would take at least 5 seconds to build. ![]()
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