pch | 易学教程

How do I access a Macro defined in my pch from a cocoapods lib?

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问题 Context We have a big project, so the application is separated from some common code. Each one goes in its own repo, and the app uses the common code as a lib via cocoapods. Situation Now, we need to toggle some very specific functionality, contained in the lib. But the condition to enable/disable it is a MACRO defined in the application-prefix.pch file (I know, not cool). Problem The code in the lib (included as a Pod) doesn't "see" the MACRO defined in the pch file. So, we can't actually

Retrieve Intel PCH temperature with Powershell

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问题 I'm trying to retrieve the intel PCH temperature with powershell. I cannot find any way to retrieve this temperature using wmi. The chipset on my machine is HM77. I've tried reading through the data sheet provided on the intel site, but to no success. Does anyone know how to do this? Thanks. Note: I can read this intel PCH temperature sensor through the HWINFO application, so it can be done somehow. 回答1: I think I got it. In powershell command line I typed wmic and I entered "wmic:root\cli>"

How to generate .pch for lots of headers?

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问题 My code uses libcxx, sdl and some other libs all the time. How can I generate .pch taking into account every header can include some other headers (even with complex conditions like #ifdef #include #endif. That's why it's difficult to understand needed header files list. Should I just use just all header files found in that folders to create .pch? What about usage of such .pch performance in that case? UPDATE: if it matters i'm going to use it with Clang (not GCC) and to be more specific via

How to increase clang parsing performance using PCH or PTH?

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问题 I'm using Clang C API for parsing and getting diagnostics. I've noticed that i'm using the same bundle of headers all the time, so i've decided to try to use PCH or PTH to increase performance. But i'm getting diagnostics that neither PCH nor PTH were used while clang_parseTranslationUnit : argument unused during compilation: '-emit-pth' /tmp/system/include/libcxx/iostream.pth: 'linker' input unused argument unused during compilation: '-emit-pch' /tmp/system/include/libcxx/iostream.pch:

Does #import <UIKit/UIKit.h> on pch slow down the compile time?

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问题 I was reading this post about imports and I had one question. Does the #import that comes in the prefix.pch file by default slow down the compile time? Should I remove it and import only when necessary? #ifdef __OBJC__ #import <UIKit/UIKit.h> #import <Foundation/Foundation.h> #endif 回答1: No. It actually improves the compilation speed. This is a nice tutorial that actually clears all the confusion over use of #import statements and .PCH files. Also it tells you in detail about something new

PIC error compiling ACE with Clang

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I'm tring to compile some ACE lib within my project with PCH support and including only sources that i need I'm on ubuntu 16.04 and i need to use clang but i've this error: error: PIC level differs in PCH file vs. current file I've prepared a MVCE, you need clang installed ofc, then just run following commands: git clone https://github.com/Yehonal/ace-clang-test.git cd ace-clang-test mkdir build cd build cmake -DCMAKE_C_COMPILER=/usr/bin/clang -DCMAKE_CC_COMPILER=/usr/bin/clang -DCMAKE_CXX_COMPILER=/usr/bin/clang++ .. make -j 4 How can i solve it? EDIT: in repository linked above i've only

Downloading a file in VBA and storing it

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I need to download a file that I got from a REST search. The URL is like the following: https://abc.def/geh/servlet/rest/vault?oid=xxx&expr=files.file1 (I needed to edit it due to privacy reasons..) The file is supposed to be a result of a Nastran computation, it can be viewed by a simple Texteditor. The Extension is .pch, it is relatively large (~21mb) How can that be implemented in VBA? First of all - the link does not work. Second of all: there can be 2 approaches depending on the output of the HTTP request. If the output is file you can use the code below: Sub DownloadFile(url As String,

Does #import <UIKit/UIKit.h> on pch slow down the compile time?

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I was reading this post about imports and I had one question. Does the #import that comes in the prefix.pch file by default slow down the compile time? Should I remove it and import only when necessary? #ifdef __OBJC__ #import <UIKit/UIKit.h> #import <Foundation/Foundation.h> #endif No. It actually improves the compilation speed. This is a nice tutorial that actually clears all the confusion over use of #import statements and .PCH files. Also it tells you in detail about something new known as "modules", introduced in iOS7. Since Xcode 5, there is a new feature introducing precompiled sources

<AppName>.pch file usage

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问题 What is the importance of .pch file and what is the significance of"#ifdef OBJC "? Also, where do we define parameters like "#ifdef IS_PRODUCTION" which are checked in .pch file. 回答1: .pch is a Pre-Compile Header. In the C and C++ programming languages, a header file is a file whose text may be automatically included in another source file by the C preprocessor, usually specified by the use of compiler directives in the source file. #ifdef OBJC lets the compiler know that the code is

<AppName>.pch file usage

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What is the importance of .pch file and what is the significance of"#ifdef OBJC "? Also, where do we define parameters like "#ifdef IS_PRODUCTION" which are checked in .pch file. .pch is a Pre-Compile Header. In the C and C++ programming languages, a header file is a file whose text may be automatically included in another source file by the C preprocessor, usually specified by the use of compiler directives in the source file. #ifdef OBJC lets the compiler know that the code is Objective-C. #ifdef IS_PRODUCTION is something you have defined on your own, a directive telling the compiler to do