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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 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 GCC compiler error: “redefinition…previously defined” up vote 7 down vote favorite 3 I'm getting a lot of " redefinition of x....x previously defined here". Please what does this error means? c++ gcc compiler-construction share|improve this question asked Apr 2 '09 at 1:00 caesar add a comment| 3 Answers 3 active oldest votes up vote 20 down vote You need to limit each file from being included only once. You can do this in 2 ways. 1) At the top of your header files put: #pragma once Or 2) if your compiler doesn't support that, put at the top/end of your header files: #ifndef _MYFILE_H_ #define _MYFILE_H_ ... #endif Replace MYFILE with the name of your file, and replace ... with the contents of the header file. share|improve this answer edited Apr 2 '09 at 7:11 unwind 254k38331460 answered Apr 2 '09 at 1:18 Brian R. Bondy 198k82474572 1 I think that #pragma only works in VC++, not in gcc. The #define trick is portable. –Gorpik Apr 2 '09 at 7:19 supoprted by gcc and vc++ –Brian R. Bondy Apr 2 '09 at 10:29 Wikipedia says #pragma once is supported by VC++ and gcc en.wikipedia.org/wiki/Pragma_once . –Max Lybbert Apr 3 '09 at 20:48 #pragma works fine with gcc.. I'm using it at this very moment after I reading about it and it solved a ton of errors! –mmoment Sep 7 '12 at 14:13 add a comment| up vote 9 down vote The error means that there is a symbol that has been defined in one place and an alternate definition has been made in another place. This can occur if in cases like: if you define two functions with the same name if there is a mismatch between a function and it's prototype you call a non-trivial function before it has been defined, and without a prototype In

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 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 Redefinition errors in http://stackoverflow.com/questions/707920/gcc-compiler-error-redefinition-previously-defined .h files up vote 6 down vote favorite //list.h file typedef struct _lnode{ struct _lnode *next; size_t row; size_t column; short data; }lnode; typedef struct _llist{ struct _lnode *head; size_t size; }llist; //matrix.h file typedef struct _matrix{ size_t width; size_t height; size_t k; int **data; }matrix; //smatrix.h file #include "list.h" #include "matrix.h" typedef struct _smatrix{ size_t width; size_t height; size_t k; llist data; }smatrix; smatrix* http://stackoverflow.com/questions/5430019/redefinition-errors-in-h-files make_smatrix(matrix *m); smatrix.h file includes list.h file and matrix.h files. If I include those header files in smatrix.h file then I get redefinition of 'lnode'. redefinition of '_llist' and redefinition of '_matrix' errors. If I took those heder files our from smatrix.h file then the error went away but it complains about matrix type in the function parameter. I want to call functions defined in list.h and matrix.h files in smatrix.c file.. What do I do? Thanks in advance.. c share|improve this question edited Apr 29 '15 at 17:48 BartoszKP 22.4k84167 asked Mar 25 '11 at 8:18 LCYSoft 3,2941160116 add a comment| 4 Answers 4 active oldest votes up vote 12 down vote accepted Possible problem of multiple inclusions. Try to guard your header files with file list.h #ifndef _LISTH_ #define _LISTH_ #endif file matrix.h #ifndef _MATRIXH_ #define _MATRIXH_ #endif It will prevent you too have redefinitions if you have a loop in header inclusions. share|improve this answer edited Mar 25 '11 at 8:29 answered Mar 25 '11 at 8:21 M'vy 3,98011532 list.h like this? –LCYSoft Mar 25 '11 at 8:27 @LCYSoft Edited &ndash

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 http://stackoverflow.com/questions/26153179/redefinition-of-i-error this site About Us Learn more about Stack Overflow the company Business http://forums.codeblocks.org/index.php?topic=20798.0 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 error redefinition up Redefinition of 'i' error up vote 0 down vote favorite So I have the following C code: for (int i = 0; i < nWallSegments; i+=4) { fscanf(fin, "%le %le %le %le", &wallSegments[i+0], &wallSegments[i+1], &wallSegments[i+2], &wallSegments[i+3]); } for (int i = 0; i < nWallSegments; i+=4) { nWallPoints += ceil(dist(wallSegments[i+0], wallSegments[i+1], wallSegments[i+2], wallSegments[i+3]) / dWallPoints) - 2; // other stuff here } error redefinition of When I try to compile, I get the following error. Coming from a Python background, I have no idea what is going on. I have searched online for the answer but with no luck. Prog.c:44:12: error: redefinition of 'i' for (int i = 0; i < nWallSegments; i+=4) { ^ Prog.c:40:12: note: previous definition is here for (int i = 0; i < nWallSegments; i+=4) {c c for-loop compiler-errors share|improve this question asked Oct 2 '14 at 1:28 Vedaad Shakib 539416 add a comment| 3 Answers 3 active oldest votes up vote 6 down vote accepted It depends on the compiler and/or the version of standard C. In standard C 1999 and later (C99 and C11), it's admissible to declare a variable in the loop itself and, moreover, the scope is only the loop, as in C++. By compiling with some modern C dialect, your code would have to go fine. I use GCC with the option -std=c99 (or c11). In this case, your code goes well for me. share|improve this answer edited Oct 2 '14 at 11:41 answered Oct 2 '14 at 1:47 pablo1977 2,825627 add

"here I am" post here to differ human beings from SPAM bots. Home Help Search Login Register Wiki Code::Blocks » User forums » General (but related to Code::Blocks) » Error: redefinition of function « previous next » Send this topic Print Pages: [1] Go Down Author Topic: Error: redefinition of function (Read 1718 times) Phrosen Single posting newcomer Posts: 7 Error: redefinition of function « on: December 21, 2015, 06:14:55 pm » I have a problem that I think is related to my IDE. I am using Codeblocks (13.12).Here's my "set up":main.c (includes 'int main()')header.h (your typical header, includes prototypes)test.c (a random file, includes custom-made functions.)Here's the issue: All the functions works as intended, but when I compile my test.c I get an error (for each function) saying: "error: redefinition of ***"This issue doesn't affect anything, but it's annoying. I'm wondering if it's possible to get rid of it somehow? Maybe I'm doing something wrong when I'm creating my prototypes?Here's an example of what my functions and prototypes look like:Code: [Select]void func_showMenu(); //This is the prototype, in header.h

void func_showMenu(){
//This is the function, in test.c
}Is there some setting in Code::Blocks that can fix this issue? Logged headkase Almost regular Posts: 129 Re: Error: redefinition of function « Reply #1 on: December 21, 2015, 07:26:33 pm » Please post the complete contents of both your header and source files. If each function pair is the same then one complete pair will suffice. Make sure to include the boiler-plate code like the: define that is supposed to be in a header. « Last Edit: December 21, 2015, 07:28:07 pm by headkase » Logged stahta01 Lives here! Posts: 5393 Re: Error: redefinition of function « Reply #2 on: December 21, 2015, 09:28:05 pm » Post the complete header file; likely you did NOT guard it correctly.Edit: read this site rules. http://forums.codeblocks.org/index.php/topic,9996.0.htmlAlso, Post a full build log in code tags.Tim S. « Last Edit: December 21, 2015, 09:30:02 pm by stahta01 » Logged C Programmer working to learn more about C++ and Git.On Windows 7 64 bit and Windows 10 32 bit.On Debian Testing, compiling CB Trunk against wxWidgets 3.0.2.--When in doubt, read the CB WiKi FAQ. http://wiki.codeblocks.org Phrosen Single posting newcomer Posts: 7 Re: Error: redefinition of function « Reply #3 on: December 27, 2015, 12:42:29 pm » I created a few test files to show the error:Here's main.c:Code: [Select]#include "header.h"

int main(){
test();

 

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