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LLVM compilation errors on VS 2012

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问题 I have built the LLVM using CMake using VS 2012 in keeping with documentation. I am trying to build a toy compiler with flex, bison and LLVM. The final stage of my compiler my main class looks like this: #include <iostream> #include "codegen.h" #include "node.h" #include "llvm/Target/Targetmachine.h" using namespace std; extern int yyparse(); extern NBlock* programBlock; void createCoreFunctions(CodeGenContext& context); int main(int argc, char **argv) { yyparse(); std::cout << programBlock <

微信团队分享：极致优化，iOS版微信编译速度3倍提升的实践总结

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1、引言岁月真是个养猪场，这几年，人胖了，微信代码也翻了。记得 14 年转岗来微信时，用自己笔记本编译微信工程才十来分钟。如今用公司配的 17 年款 27-inch iMac 编译要接近半小时；偶然间更新完代码，又莫名其妙需要全新编译。在这么低的编译效率下，开发心情受到严重影响。于是年初我向上头请示，优化微信编译效率，上头也同意了。学习交流： - 即时通讯/推送技术开发交流5群： 215477170 [推荐] - 移动端IM开发入门文章：《新手入门一篇就够：从零开发移动端IM 》（本文同步发布于： http://www.52im.net/thread-2873-1-1.html ） 2、相关文章《微信团队分享：微信移动端的全文检索多音字问题解决方案》《微信团队分享：iOS版微信的高性能通用key-value组件技术实践》《微信团队分享：iOS版微信是如何防止特殊字符导致的炸群、APP崩溃的？》《微信团队原创分享：iOS版微信的内存监控系统技术实践》《 iOS后台唤醒实战：微信收款到账语音提醒技术总结》《微信团队分享：微信Android版小视频编码填过的那些坑》《微信手机端的本地数据全文检索优化之路》《微信团队披露：微信界面卡死超级bug“15。。。。”的来龙去脉》《微信客户端团队负责人技术访谈

微信团队分享：极致优化，iOS版微信编译速度3倍提升的实践总结

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微信团队分享：极致优化，iOS版微信编译速度3倍提升的实践总结

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【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 1、引言岁月真是个养猪场，这几年，人胖了，微信代码也翻了。记得 14 年转岗来微信时，用自己笔记本编译微信工程才十来分钟。如今用公司配的 17 年款 27-inch iMac 编译要接近半小时；偶然间更新完代码，又莫名其妙需要全新编译。在这么低的编译效率下，开发心情受到严重影响。于是年初我向上头请示，优化微信编译效率，上头也同意了。 2、现有方案在动手之前，先搜索目前已有方案，大概情况如下。 2.1 优化工程配置 1）将 Debug Information Format 改为 DWARF： Debug 时是不需要生成符号表，可以检查一下子工程（尤其开源库）有没有设置正确。 2）将 Build Active Architecture Only 改为 Yes： Debug 时是不需要生成全架构，可以检查一下子工程（尤其开源库）有没有设置正确。 3）优化头文件搜索路径：避免工程 Header Search Paths 设置了路径递归引用： Xcode 编译源文件时，会根据 Header Search Paths 自动添加 -I 参数，如果递归引用的路径下子目录越多，-I 参数也越多，编译器预处理头文件效率就越低，所以不能简单的设置路径递归引用。同样 Framework Search Paths 也类似处理。

Why is Clang automatically adding attributes to my functions?

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问题 I have a piece of code that I'm trying to turn into LLVM bitcode: int main() { volatile double n = 0.45; for (int j = 0; j < 32; j++) { n *= j; } return 0; } I run the following command on it: clang -O0 -S -emit-llvm TrainingCode/trainingCode.cpp -o TrainingCode/trainingCode.ll to generate the following LLVM bitcode (take note of the 6th line, the one with "Function Attrs"): ; ModuleID = 'TrainingCode/trainingCode.cpp' source_filename = "TrainingCode/trainingCode.cpp" target datalayout = "e-m

Xcode 7 command failed due to signal: illegal instruction 4

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问题 I just used Xcode 7's migration tool to migrate a project from Swift 1.2 to 2. After fixing up errors missed and such, all is well except for an error which prevents me from even building: Command failed due to signal: illegal instruction 4. I have tried the help in these articles (Xcode 7 and Swift 2.0 : Command failed due to signal: Abort trap: 6, and Command failed due to signal: Abort trap: 6) which are not identical issues to mine, but nevertheless they were not able to fix the issue. I

Why isn't clang defined when using LLVM+Clang in Visual Studio?

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问题 I installed LLVM for Windows, which includes Clang and a few other tools. It integrates with Visual Studio, and even lets me choose a "Platform Toolset" in the project properties. However, when I choose any of the toolsets that came with LLVM, __clang__ isn't defined, and _MSC_VER is defined instead. How do I make __clang__ defined when using LLVM and Clang in Visual Studio? My Visual Studio version is the 2015 Preview (however I have also tested on 2013 with no success either), and my LLVM

Difference in stringstream behavior for void* type using libc++ and libstdc++

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问题 The following test program returns different results depending on whether I'm using libc++ or libstdc++. #include <sstream> #include <iostream> int main() { int a = 0; void* optr = &a; void* iptr; std::stringstream ss; ss << optr; std::cout << ss.str() << '\n'; ss >> iptr; std::cout << iptr << '\n'; return 0; } I'm using the following version of clang from Xcode 5 on OSX 10.9.2 $ xcrun clang++ --version Apple LLVM version 5.0 (clang-500.2.79) (based on LLVM 3.3svn) Target: x86_64-apple

LLVM insert pthread function calls into IR

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问题 I'm writing a LLVM pass (it's a LoopPass ) that needs to insert pthread functions calls like pthread_create() and pthread_join() into the IR. I know how to create and insert a function call into IR, but I am having trouble to get the pthread representation of Function* in LLVM. Here's what I have: Function *pthread_create_func = currentModule->getFunction("pthread_create"); but it returns NULL. As a comparison Function *printf_func = currentModule->getFunction("printf"); will return the

how to compile CUDA to llvm IR?

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问题 I've been trying for three days to compile a CUDA kernel into llvm IR and I couldn't do it. I've changed langoptions.cpp and added CUDA=1; in the constructor , but still the clang give me Error messages for cuda syntax (like _synchthreads() call). I've done the following: downloaded llvm (including clang) modified langoptions.cpp (CUDA=1; in the constructor), and installed it. installed CUDA toolkit 4.1 and CUDA SDK. compiled a CUDA example using clang using: clang -I${CUDA_HOME}/include -I$

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