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Undefined Reference Error In C


By Matt3000 in forum C Programming Replies: 12 Last Post: 07-07-2006, 05:42 PM c++ linking problem for x11 By kron in forum Linux Programming Replies: 1 Last Post: 11-19-2004, 10:18 AM Notice again that this was an error caused by a problem earlier in the program, not on line 8, but earlier, when the struct lacked a semicolon terminator. A single error near the top of your program can cause a cascade of other compiler errors because those lines might rely on something early in the program that the compiler What checkin and checkout date to pick? navigate here

These are compiled separately, using the C++ compiler, to produce object code files (files with a .o or a .obj extension) which contain machine code. You'll need to specify both files, something like: gcc testpoint.c point.c ...so that it knows to link the functions from both together. The second is a rule to tell make 1) that the executable depends on the object files, and 2) telling it how to create the executable when/if it's out of date Fill in your details below or click an icon to log in: Email (required) (Address never made public) Name (required) Website You are commenting using your WordPress.com account. (LogOut/Change) You are http://stackoverflow.com/questions/8024440/what-causes-the-error-undefined-reference-to-some-function

Undefined Reference Error In C

Since point.c has the definition for create, not having point.c will cause the compilation to fail. For instance, the statement "for(;)" isn't correct syntax because a for loop always needs to have three parts. c makefile share|improve this question edited Nov 8 '14 at 19:04 asked Nov 8 '14 at 18:44 Rohawk 112111 add a comment| 2 Answers 2 active oldest votes up vote 0 You might be making a typical mistake that the compiler knows about.

These IDEs offer you a number of project types such as “Windows Application” and “Console Application”. Otherwise, you will get "undefined function" error messages. Why isn't Almond Milk (and other non-animal based 'milk') considered juice? C++ Undefined Reference To Constructor I'm not familiar with MinGW, but you need to tell the compiler to look for point.c.

A second cryptic message is the "unexpected end of file". How can Data be property of Starfleet? You'll need/want to eliminate one (undoubtedly the one in point.c). Image credits Register Remember Me?

Can a un-used Nonclustered Index still help Query Performance? Undefined Reference To Static Variable C++ Suppose you have two C++ source files: // f1.cpp int foo(); int main() { foo(); } and: // f2.cpp int foo() { return 42; } If you compile f1.cpp on its I'm using MinGW for the compiler. Why aren't we sending quadcopters to mars?

Undefined Reference To Function C++

How do dragons not burn themselves? Compiler errors are restricted to single source code files and are the result of 'syntax errors'. Undefined Reference Error In C How can the compiler know this at all? Undefined Reference To C++ Error This tool uses JavaScript and much of it will not work correctly without it enabled.

Instead, it means that the linker tried to create an executable and couldn't figure out where the main() function was located. http://robertwindows.com/undefined-reference/cmake-linking-error-undefined-reference.html I've only hit on the bare minimum of high points here. The brief message here is quite helpful because it says exactly what was wrong. Ultimately, when a message is cryptic, the way to approach the problem is to think about how the compiler is trying to interpret the file. C++ Undefined Reference To Class

more hot questions lang-cpp about us tour help blog chat data legal privacy policy work here advertising info mobile contact us feedback Technology Life / Arts Culture / Recreation Science Other Why would the end of the file be "unexpected"? Forum Today's Posts C and C++ FAQ Forum Actions Mark Forums Read Quick Links View Forum Leaders What's New? his comment is here To perform the linkage, if you are using an IDE you can normally simply add the library to your project, if using the command line, once again please see my series

What if passport is lost and home country has no diplomatic presence? Undefined Reference Error In C Compilation For example, if the code above we had provided a definition of foo() that looked like this: int foo(int n) { return n; } then we would still get an error Make sure you don't declare (or include) the same type with different structure in the source files.

You may have issues with how you set up your compiler.

That means that either You're not linking with net.o net.c (as compiled) does not contain a definition for function_name -- by 'as compiled' I mean with all of the various preprocessor Can someone take my Wi-Fi signal DOWN? Thanks for the helpful response! –Rohawk Nov 8 '14 at 19:13 add a comment| up vote 1 down vote For the two functions "see" each other make sure that: Both c/cpp C++ Undefined Reference To Class Function Generally, you can set the warning level of your compiler--I like to keep it at its highest level so that my compiler warnings don't turn in to bugs in the running

Truth Stone: Effects on the justice system, and criminal world Can you have negative sets? The Cprogramming.com ebook, Jumping into C++, will walk you through it, step-by-step. My boss asked asked if my colleague is underperforming Why aren't we sending quadcopters to mars? weblink ld is the linker, so if you get an error message ending with "ld returned 1 exit status", that tells you that it's a linker error.

Read More NEWS   12 Nov 2015 The accidental thermal engineer: Can we know Tj by looking at Tcase? The good point of this is that make automatically looks at the timestamps on the files, so it will only re-compile the files that have changed since the last time you Hot Network Questions PrimitiveParser std::string += operator cannot pass 0 as argument My boss asked asked if my colleague is underperforming How to professionally handle sexist remarks by a student? Browse other questions tagged c function reference undefined or ask your own question.

I'll keep the naming convention in mind! Join them; it only takes a minute: Sign up Linking error: Undefined reference to functions that're defined in a separate file? Integral calculus sine functions What is a one word noun for Ethereum? Shortest code to produce non-deterministic output Should I accept a low hourly rate while in between contracts?

To avoid this problem, take some care when writing declarations and definitions, and remember that things like references, pointers and const all count towards making a function signature unique. Is it possible to have ONE Field that performs two separate functions (formulas) for two different Record Type Opportunities? Handling Cryptic or Bizarre Messages There are several types of compiler errors that are especially frustrating. Hot Network Questions Is space piracy orbitally practical?

I feel quite silly having not seen the misspelling. Quick Navigation C++ Programming Top Site Areas Settings Private Messages Subscriptions Who's Online Search Forums Forums Home Forums General Programming Boards C++ Programming C Programming C# Programming Game Programming Networking/Device Communication Investigating C++11 Threads Common C++ Error Messages #1 - No such file ordirectory Learning Go – Miniblog #14 – Closures andGoroutines Learning Go – Miniblog #13 – More On ServerObjects Learning Not the answer you're looking for?

I copied and pasted them to create the function headers, so there shouldn't be any typos.