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Gcc Error Redefinition Struct

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Error: Redefinition Of C++

Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask c++ error redefinition of function Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up c++ undefined reference error: redefinition of ‘struct StructName’ message when compiling in Objective-C on Linux up vote 2 down vote favorite I'm trying to compile Objective-C code on Ubuntu 12 Linux. main.m looks like this: #import #import "CEFoo/CEFoo.h" int main (int argc, const char * argv[]) { NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init]; NSLog (@"hello world"); [pool drain]; return 0; } In CEFoo.h, I

#ifndef

have the definition: struct StructName{ // line 86 BOOL first; ... ... }; @interface StructName :NSObject // line 92 BOOL first; // line 93 ... ... @end // 96 When I go to compile with gcc main.m `gnustep-config --objc-flags` -lgnustep-base -o main.bin I get this message: Foo/CEFoo.h:93:1: error: redefinition of ‘struct StructName’ Foo/CEFoo.h:86:8: note: originally defined here I've read this can be caused by either redefining the struct twice, or by recursive import when using include instead of import. grep -r "struct StructName" * Only shows one occurrence of the definition. I've also searched every include statement in the project, and have found no apparent uses of include vs import, or otherwise dual include/imports of CEFoo.h (the file which contains the structure which is being defined / imported more than once). How can I further hunt down the cause of this? I assume that I am importing it twice -- if I am, is there a way to watch it via verbose or logs defined for the first time? Any other ideas what I can do to troubleshoot this? TIA objective-c linux gnustep redefinition share|improve this quest

here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the undefined reference to company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up C++ struct redefinition compiler error up vote 1 down vote favorite I have created a new .h file with the http://stackoverflow.com/questions/11426997/error-redefinition-of-struct-structname-message-when-compiling-in-objective-c following contents: #include "stdafx.h" #include using namespace std; struct udtCharVec { wstring GraphemeM3; wstring GraphemeM2; }; When I want to compile it, the compiler tells me "error C2011: udtCharVec: struct type redefintion". I did a text search, and I don't have "struct udtCharVec" defined anywhere else. Does anybody see where I went wrong? c++ compiler-construction struct share|improve this question asked May 26 '13 at 9:35 user2421725 294 you got error http://stackoverflow.com/questions/16757941/c-struct-redefinition-compiler-error in current file where you defined struct? or are you using this code as include file for someother file? –Dineshkumar May 26 '13 at 9:40 1 Aside from your problem, don't use a "using directive" in a header file: stackoverflow.com/questions/4872373/… –Michael Burr May 26 '13 at 9:41 where is the usage code of your header file? Edit your question and post it... –pinkpanther May 26 '13 at 9:41 add a comment| 2 Answers 2 active oldest votes up vote 4 down vote accepted You are probably including this header file more than once in a single translation unit. When the file is included for the second time, struct udtCharVec has already been defined, and so you get a "type redefinition" error. Add an include guard. After the first inclusion, CharVec_H will be defined, and so the rest of the file will be skipped: #ifndef CharVec_H #define CharVec_H #include "stdafx.h" #include using namespace std struct udtCharVec { wstring GraphemeM3; wstring GraphemeM2; }; #endif Say your project consisted of three files. Two header files and one source file: CharVec.h #include "stdafx.h" #include using namespace std struct udtCharVec { wstring GraphemeM3; wstring GraphemeM2; }; CharMatrix.h #include "CharVec.h" struct udtCharMatrix { CharVec vec[4]; }; main.cpp #include "CharVec.h" #include "CharMatrix.h" int main() { udtCharMatrix matrix = {

here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us http://stackoverflow.com/questions/13242401/a-reused-named-struct-as-a-nested-struct-triggers-a-redefinition-error-in-gcc Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow https://developer.mbed.org/users/RyoheiHagimoto/notebook/compiler-error-of-ethernetinterface/ Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up A reused named struct as a nested struct error redefinition triggers a redefinition error in GCC up vote 1 down vote favorite This is a contrived example, but expresses the core problem. I have a union and a structure with the same nested structure from an existing code base: typedef union _MyUnion { unsigned int A; struct _MyNestedStruct { int field } MyNestedStruct; } MyUnion; and typedef struct _MyStruct { struct _MyNestedStruct { int field } MyNestedStruct; } error redefinition of MyStruct; If I compile this under the Green Hills Compiler (GHC), then there are no problems. Compiling under GCC gives the error "error: redefinition of 'struct _MyStruct'". First of all, why was I able to successfully compile with a named structure as a nested structure? I suspect that GHC is compiling with some C++ rules, or it supports named structures in a nested structure. Second, what would allow me to successfully compile without any significant code changes? I know I can just delete the _MyNestedStruct from the nested structure, but does this have any consequences? c struct unions share|improve this question edited Nov 8 '12 at 0:12 timrau 17.1k32450 asked Nov 5 '12 at 23:58 Joshua 280212 Maybe you are really redefining the struct, because I can compile it just fine in many GCC distribuitions here. –Flávio Toribio Nov 6 '12 at 0:20 Is there any reason that you change MyNestedStruct to a declaration instead of a definition? That is, define _MyNestedStruct external to the containing union/struct, then declare an instance of the struct inside the container –cowboydan Nov 6 '12 at 0:23 @FlávioToribio: Maybe you are compiling it as C++, because I ge

ARM Compiler error of EthernetInterface + GCC ARM Page last updated 25 Jan 2016, by Ryo Hagimoto. 0 replies InformationJapanese version is available in lower part of this page. このページの後半に日本語版が用意されています. Compiler error of EthernetInterface + GCC ARM When you compile a exported project that conotains EthernetInterface by GCC ARM ver 5.2 (2015/4q) or later, following error occurs. In file included from ./EthernetInterface/Socket/Socket.h:21:0, from ./EthernetInterface/Socket/TCPSocketConnection.h:22, from ./EthernetInterface/EthernetInterface.h:84, from main.cpp:2: ./EthernetInterface/lwip/include/lwip/sockets.h:311:8: error: redefinition of 's truct timeval' struct timeval { ^ In file included from c:\program files\gnu tools arm embedded\5.2 2015q4\arm-non e-eabi\include\sys\select.h:27:0, from c:\program files\gnu tools arm embedded\5.2 2015q4\arm-non e-eabi\include\sys\types.h:89, from c:\program files\gnu tools arm embedded\5.2 2015q4\arm-non e-eabi\include\stdio.h:48, from c:\program files\gnu tools arm embedded\5.2 2015q4\arm-non e-eabi\include\c++\5.2.1\cstdio:42, from ./mbed/platform.h:27, from ./mbed/mbed.h:21, from main.cpp:1: c:\program files\gnu tools arm embedded\5.2 2015q4\arm-none-eabi\include\sys\_ti meval.h:51:8: error: previous definition of 'struct timeval' struct timeval { ^ Makefile:60: recipe for target `main.o' failed make: *** [main.o] Error 1 The way to fix the error following description is written in EthernetInterface\lwip\include\lwip\sockets.h(304). /** LWIP_TIMEVAL_PRIVATE: if you want to use the struct timeval provided * by your system, set this to 0 and include in cc.h */ According to this description, you can fix this error by modifing following 2 files. EthernetInterface\lwip\include\lwi

 

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