pch

来源： https://stackoverflow.com/questions/63354055/clang-pch-performance-worse-than-with-headers

问题 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

问题 If you take the code below, how can you change the filling of the third diamond, so it will be half-black, half-white? The solution should apply with any colors. data <- c(1,2,3) plot(data, pch=c(23,18,23), cex=c(2.5,3,2.5)) 回答1: The pch characters are actual font symbols, so you will be limited to what is available in your fonts. Another alternative is to use the primitive plotting commands to make your own "symbols". This is very flexible, although there can be issues with resizing, etc.,

问题 Am currently trying to link a bunch of Objective C modules into a static library. I am getting the following error and am unable to locate any information on how the __STATIC__ can not be disabled when building a PCH file. error: __STATIC__ predefined macro (as opposed to __DYNAMIC__) was disabled in PCH file but is currently enabled The command to build the PCH file is: clang -cc1 -target-cpu x86-64 -g -fno-validate-pch -emit-pch -x objective-c-header afile.pch -o afile.pch.bin -O0 -fmath

问题 I have an Objective C project in XCode. When building, XCode precompiles my prefix PCH file twice. The first time, it uses the arguments -x objective-c-header , and it works fine. The second time, it uses -x c-header , and it fails (due to the file containing Objective C code). I have another project that's set up the same, but it builds fine. (The PCH is only precompiled once, with Objective C.) I compared the build settings for the two projects side-by-side, and nothing relevant differed. I

问题 There's an issue in Xcode 4.2, where Xcode will fill my boot drive with tens of GB of preamble.pch-****** files, someplace within /private/var/folders/ . Does anybody know how to prevent this from happening? This means I have to manually empty these files every few hours (quitting/restarting Xcode if necessary), to prevent my boot drive from filling up. I'd (likely) rather revert to the old behavior than create some script or program to systematically remove these every hour, if possible.

问题 I have looked all over and cannot find a solution to this problem. The problem involves adding a header file to an xcode 6.1 project. What I want to be able to do is add a header file that is automatically imported to each of the files I create. i.e. I create a.h & a.m. Where previouslyMade.pch or previouslyMade.h definitions are already included. I've looked through build settings and there isn't an option to update the .pch file. Is there a solution to this or have I got to import a .h file

问题 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? 回答1: First of all - the link does not work. Second of all: there can be 2 approaches depending on the

问题 Documenting an odd XCode 4 Error here for future reference: "one or more PCH files were found, but they were invalid" Cleaning does not fix the issue, you need to clean the Build Folder by holding down ALT and selecting Product from the menu. The "Clean" entry will now have changed to "Clean Build Folder" which will wipe the bad PCH duplicates and compile without errors. 回答1: I had to read this a few times to get what was going on. The original poster answered his own question. To fix: Clean

问题 In my pch file I have the following definitions: #if (_MSC_VER < 1300) typedef signed char int8_t; typedef signed short int16_t; typedef signed int int32_t; typedef unsigned char uint8_t; typedef unsigned short uint16_t; typedef unsigned int uint32_t; #else typedef signed __int8 int8_t; typedef signed __int16 int16_t; typedef signed __int32 int32_t; typedef unsigned __int8 uint8_t; typedef unsigned __int16 uint16_t; typedef unsigned __int32 uint32_t; #endif typedef signed __int64 int64_t;