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Questions tagged [pch]

Precompile Prefix Header

In iOS development with Xcode, PCH stands for Precompile Prefix Header, to make compiling faster and avoid repeating using same header file over and over again.

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Objective-C: Xcode Prefix Header (.pch file) redundant #import

Can't I leave out #import "foo.h" in .m file if it's already in the prefix header? The product still builds successfully when I leave it out. But, I've noticed that the Xcode templates keep them in. Why? Is the answer the same for #include?
ma11hew28
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Cluster Analysis Visualisation: Colouring the Clusters after categorial variable

Salut folks! I'm still quiet new to ggplot and trying to understand, but I really need some help here. Edit: Reproducible Data of my Dataset "Daten_ohne_Cluster_NA", first 25 rows structure(list(ntaxa = c(2, 2, 2, 2, 2, 2, 2, 5, 5, 5, 5, 5, 6, 6,…
HeAn
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Is it allowed to include a precompiled header into a header file?

I know what precompiled headers are, but I found nothing about pch-s being included in header files. Can you do that? I tried it and it worked. Does it have some drawbacks?
Uytab
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Use precompiled headers in C++ project

I have a project with the following structure root/ CMakeLists.txt mylibrary.hpp test/ CMakeLists.txt // included from root's CMakeLists A.cpp //includes B.cpp // also C.cpp // also ... Z.cpp // also I…
alfC
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Unexpected end of file while looking for precompiled header

I've been trying to organize my code into sub-folders, and I've been careful to not do anything extra than that since my last commit. I am currently getting a bunch of C1010 errors saying: unexpected end of file while looking for precompiled header.…
user7898257
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Why am I getting a warning to include pch.h even though it's already included?

I'm trying to reproduce an issue, so I have created an empty MFC C++ application using the VS2019 wizard and a separate native Unit Test project. Before adding the Unit Test project, the MFC application compiled and launched successfully. The MFC…
afarley
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How to add a precompiled header in xcode 11

I wanted to define few custom values in a pre-compiled header for different targets of my app. I tried the following to define headers, but none worked: by adding a header from Editor -> Add Build Setting -> Add User Defined setting and assign key…
Deepak Thakur
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Is there an optimal way to use pre-compiled headers in multiple projects?

I have a solution with 2 projects, one is a static library and the other is an application that links to it. In the static library I have a pre-compiled header file with the following code: #pragma once //C standard Library #include…
AbdelRahman Mahmoud
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While renaming a pch file at Debug folder it shows cl.exe is using it

I have a pch file at the debug directory of my application's visual studio project. But it shows in use by cl.exe. I don't have any visual studio IDE open. I can't think which agent can keep cl.exe alive to keep a file in use. I need help if anyone…
Tajuddin Khandaker
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Plot in R not recognizing pch numbers

I am trying to plot in base R with the regular plot() fcn. However, when passing a vector of which pch to use, it will not plot the pch, it will only plot the number '1' instead of the shape of the pch I am calling. Generating some data (my real…
Purrsia
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Premake (lua) pch create /Yc Visual Studio

In the premake lua script for my solution. How do i set it to create "/Yc" the phc instead of being set to use "/Yu" on first initialisation. I have searched the online documentation and tried other help sites. I can't find any help. I assume it's a…
Alice Turner
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Project downloaded from github not runing in xcode 10

I had download a project from my git repo. In my project there are two .xcodeproj file, podfiles with some of objective c code. But is not running and giving error I had try to edit manage schemes and also try to install/update pods but pod…
iOS Banjare
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Visual Studio C++ console application

I recently had to reinstall visual studio. Previously when I chose Windows Console Application it would load with #include "stdafx.h". Now for some reason it loads with #include "pch.h" and a "hello world" program. I just want it to default load…
Pandax35
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MSVC 2008, debugging process, can't debug

I've been working on this project for a while now, its a legacy DLL, my part is to adapt it to work with a new version of a library. I added a definition to the build defined in the Properties / C/C++ / Preprocessor / Preprocessor Definitions The…
SPlatten
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Adding Sqlite3 to project Error C1853 precompiled header file is from a previous version

I am working on a project VS2015 x64 unmanaged cpp I added sqlite3.c, sqlite3.h to the project and build. I get this message. sqlite Error C1853 precompiled header file is from a previous version of the compiler, or the precompiled header is C++…
Jeff
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