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Error Redefinition Of C

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C++ Undefined Reference

a minute: Sign up redefinition of struct in linux GCC up vote 0 down vote favorite I am a beginner in programming.I try to compile a c program in linux, gcc written by the others and got the following error . cmd.h:145: error: redefinition of ‘struct stat’. It seems somebody has defined the struct 'stat' more than once. But since there are

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lots of code files, i dont know how to solve it.Can anyone advise me on that. Thanks c linux gcc share|improve this question edited Mar 9 '11 at 9:03 asked Mar 9 '11 at 8:52 user647868 315 How do you include files, where struct is defined? –pmod Mar 9 '11 at 9:07 @user647868 If you're going to completely change your question, please ask a separate question, perhaps deleting the old one, rather than editing the old one -- that completely confuses the heck out of people and results in what look like erroneous answers. We like to be helpful, but you need to be as well. –Jim Balter Mar 9 '11 at 9:24 Also, you accepted an answer mighty quickly. You might want to wait a bit and see what other suggestions come in. –Jim Balter Mar 9 '11 at 9:26 add a comment| 4 Answers 4 active oldest votes up vote 0 down vote accepted Try using grep -r "struct stat" * to find the definition? Try your own code first then check for defini

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 undefined reference to 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 http://stackoverflow.com/questions/5243293/redefinition-of-struct-in-linux-gcc 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 http://stackoverflow.com/questions/707920/gcc-compiler-error-redefinition-previously-defined ... with the contents of the header file. share|improve this answer edited Apr 2 '09 at 7:11 unwind 254k38332460 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 this last case there will be a mismatch between the real function and the "implicit declaration" that the compiler assumes when it doesn't have a prototype to use. These situations can be avoided by: Ensuring that function prototypes are only declared once Ensuring that all fun

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 http://stackoverflow.com/questions/13242401/a-reused-named-struct-as-a-nested-struct-triggers-a-redefinition-error-in-gcc developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask http://stackoverflow.com/questions/21718562/c-conflicting-types-for-error 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 A reused named struct as a nested struct triggers a redefinition error in GCC up vote 1 down vote favorite This is a contrived example, but expresses the core problem. I error redefinition 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; } 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 error redefinition of 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 get the error. –rodrigo Nov 6 '12 at 0:24 I just noticed he used the same struct name and probably put the two typedefs in the same source. –Flávio Toribio Nov 6 '12 at 0:26 add a comment| 1 Answer 1 active oldest votes up vote 7 down vote accepted In C there are no namespace scopes, implicit or explict, so all the structure names share the

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 C, “conflicting types for… ” error up vote 2 down vote favorite Before I continue, here is the code which is giving me an error: #define numScores 3 // the number of test scores which a student will have struct btreenode{ int studentID; // the ID number of the student at the current node float scores[3]; // the 3 test scores of the student float average; // the average of the 3 test scores for the student struct btreenode *left; // pointer to left side of the tree struct btreenode *right; // pointer to right side of the tree }; typedef struct btreenode *Node; I'm getting the following error when I compile: btreenode.h:17: error: redefinition of 'struct btreenode' btreenode.h:28: error: conflicting types for 'Node' btreenode.h:28: note: previous declaration of 'Node' was here I have a block comment at the top so the line numbers are off, but line 17 is the first line "struct btreenode{" line 28 is the last line "typedef struct btreenode *Node" Does anyone know why i'm getting these errors? c struct compiler-errors typedef redefinition share|improve this question edited Feb 12 '14 at 4:32 Siddique Mahsud 1,243617 asked Feb 12 '14 at 4:20 jlzizmor 1313 You mean struct btreenode *Node;? –herohuyongtao Feb 12 '14 at 4:22 No errors for me. See online demo of successful compilation. –Ray Toal Feb 12 '14 at 4:25 compiled successfully for me also. –Jayesh Feb 12 '14 at 4:26 @jlzizmor might be this error occurs if you declared same structure in source file .c file also or header included twice in source.can you show source and header file. –Jayesh Feb 12 '14 at 4:31 Looks like you're including the file with these definitions more than once. Use header guards. –Dmitri Feb 12 '14 at 4:34 | show 4 more comment

 

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