clang

问题 Is it possible to generate a C source file (.c) from an Objective-C source file (.m), using, maybe, GCC or Clang (or another tool)? 回答1: No, but you may be interested in the C++ rewriter. Given an objective-C file, let's say: #import <stdio.h> int main() { void (^blk)(void) = ^{ printf("hi"); }; blk(); return 0; } You can get a C++ version with clang -rewrite-objc main.c which is great to see how objective-C is implemented. Most of the file will be just C. Some of the resulting expressions

问题 I have a c++ program where I want to compile out std::exit and use my own, i.e. via: -Dexit=myExit However, I run into this issue: In file included from /usr/include/c++/7/ext/string_conversions.h:41:0, from /usr/include/c++/7/bits/basic_string.h:6352, from /usr/include/c++/7/string:52, from /usr/include/c++/7/bits/locale_classes.h:40, from /usr/include/c++/7/bits/ios_base.h:41, from /usr/include/c++/7/ios:42, from /usr/include/c++/7/istream:38, from /usr/include/c++/7/sstream:38, from tests

问题 This question already has answers here : Closed 7 years ago . Possible Duplicate: Is there a performance difference between i++ and ++i in C? I heard it said that prefix incrementation is faster than postfix incrementation in C. Is this true and why? ++x vs x++ 回答1: This is a ridiculous myth that gets repeated over and over. The two operators have semantic differences; one has as its result the old value and the other has as the result its new value. If you use this result, the code will have

问题 This question already has answers here : Closed 7 years ago . Possible Duplicate: Is there a performance difference between i++ and ++i in C? I heard it said that prefix incrementation is faster than postfix incrementation in C. Is this true and why? ++x vs x++ 回答1: This is a ridiculous myth that gets repeated over and over. The two operators have semantic differences; one has as its result the old value and the other has as the result its new value. If you use this result, the code will have

问题 I've had this error for weeks I already made a post about it but it wasn't very clear. So I am calling a function from a a header file myBmpGris.h and the functions are implemented on the file myBmpGris.c . Here is my main file: #include<stdio.h> #include<stdlib.h> #include "myBmpGris.h" int main(){ char * image_name = "image_carre.bmp"; BmpImg image = readBmpImage(image_name); return 0; I compile by using ggc main.c and I get this error message : Undefined symbols for architecture x86_64: "

问题 I am writing a custom programming language. I am generating LLVM IR as an intermediate (via LLVMlite), and I want to expose variables to GDB. This is an example of the generated IR: ; ModuleID = "tests/debuginfo.xan" source_filename = "debuginfo.xan" target triple = "x86_64-unknown-linux-gnu" target datalayout = "" define void @"main"(i32 %".1", i8** %".2") !dbg !10 { entry: %"$argc" = alloca i32 store i32 %".1", i32* %"$argc" %"$argv" = alloca i8** store i8** %".2", i8*** %"$argv" %"$a" =

问题 XCode comes with LLDB, presumably there is a way to enable it as the debugger to use when debugging XCode projects. Of course being a Linux user I have become a hardcore command-line fanatic and I have a well-established Vim and Tmux workflow. Also being a code portability freak, 100% of my scripts work on both OS X and Linux. So is there some sort of way to "Pull out" the LLDB from deep within the bowels of XCode and run it from the command line? What are the benefits of compiling it

问题 I have a complex C project. In a file message.h I declare this structure struct message { int err; struct header { char *protocol_version; char *type; long int sequence_number; } header; struct body { int num_tag; char *tag_labels[LEN]; int num_attr_tag[LEN]; char *attr_labels[LEN][LEN]; char *attr_values[LEN][LEN]; char *attr_types[LEN][LEN]; } body; }; In the file "castfunctions.h", I include the file "message.h" and I declare the function "setClientNat" #include <message.h> void

问题 I installed Spark Inspector to see what it was like. I don't know for certain but I think it caused a problem with cocoapods. I'm in the middle of trying to remove them both. I've fixed most things but I'm not getting a build error of... framework not found -fobjc-arc I'm not sure where to start with this as I can't find a framework called this and I've never seen this error before. Can someone point me in the right direction please. 回答1: Robert Harvey's comment got me looking in the right

问题 I installed Spark Inspector to see what it was like. I don't know for certain but I think it caused a problem with cocoapods. I'm in the middle of trying to remove them both. I've fixed most things but I'm not getting a build error of... framework not found -fobjc-arc I'm not sure where to start with this as I can't find a framework called this and I've never seen this error before. Can someone point me in the right direction please. 回答1: Robert Harvey's comment got me looking in the right