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Linker Error Undefined Reference To Main

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Now, assuming that your main is in main.c, just add main.c to your command line parameters. Don't ask your linker to link if you only compile a single translation unit. g++ -c Hash.cpp -o Hash.o g++ -o prog1 main.cpp Hash.o -std=c++0x share|improve this answer answered Jan 28 '13 at 8:08 billz 32.5k44075 add a comment| up vote 0 down vote Your So if you get a linker error regarding a name that is in a library you are using, it is almost certainly because you have not linked with that library. have a peek at these guys

The Types of Compilation Errors First, let's distinguish between the types of errors: most compilers will give three types of compile-time alerts: compiler warnings, compiler errors, and linker errors. This code illustrates the problem: int foo(); int main() { foo(); } Here, we have a declaration of the function foo(), which we call in main(), but no definition. I am attempting to link several c programs together, and I am getting an error in response: $ gcc -o runexp.o scd.o data_proc.o -lm -fopenmp /usr/lib/gcc/x86_64-linux-gnu/4.6/../../../x86_64-linux-gnu/crt1.o: In function `_start': (.text+0x20): undefined Damn, you think, I guess I have to figure out what this all means...

Undefined Reference To Main Gcc

Handling Cryptic or Bizarre Messages There are several types of compiler errors that are especially frustrating. Reorder the data members in either the class definition or the member initialization list. Linker 101 To understand the linker, you have to understand how C++ programs are built. Name spelling on publications How to concatenate three files (and skip the first line of one file) an send it as inputs to my program?

I have been following a tutorial (http://interactive-matter.eu/how-to/developing-software-for-the-atmel-avr-with-avr-eclipse-avr-gcc-avrdude/) on setting up Eclipse to program AVR. Add this somewhere: int main() { return 0; } share|improve this answer answered Jan 31 '13 at 7:29 Lundin 59.9k1186157 add a comment| up vote 10 down vote You should be You pick out words like "warning and "error". Undefined Reference To Main Makefile Uncertainty principle Soft question: What exactly is a solver in optimization?

Tags:Tools, Compilers and General Programming Log in / register to post comments Top clawson Level: Moderator Joined: Mon. Undefined Reference To Main In Function _start What does Differential Geometry lack in order to "become Relativity" - References Want to make things right, don't know with whom more hot questions question feed lang-c about us tour help The last bizarre type of linker error is a complain about an "undefined reference to main". http://stackoverflow.com/questions/7965437/undefined-reference-to-main-collect2-ld-returned-1-exit-status Not the answer you're looking for?

The main function is simply doing nothing at this point, but checking for command line arguments. Undefined Reference To Main Error In C You probably don't want to link 2 main functions together. I just can't seem to figure out why. Probably that you have failed to include a definition of main.

Undefined Reference To Main In Function _start

dunlopjp View Public Profile View LQ Blog View Review Entries View HCL Entries Find More Posts by dunlopjp 07-29-2011, 08:28 AM #15 dwhitney67 Senior Member Registered: Jun 2006 Location: http://www.cprogramming.com/tutorial/compiler_linker_errors.html c++ share|improve this question asked Jan 31 '13 at 7:18 smileham 4931516 Where's the main function? –chris Jan 31 '13 at 7:19 4 You need an int main() Undefined Reference To Main Gcc Join them; it only takes a minute: Sign up C++ Error: undefined reference to `main' up vote 5 down vote favorite 2 I'm working on a simple class List, but when Undefined Reference To Main C++ This phrase is generally found in a compiler error when you are trying to change a data member in a const object.

When using the g++ frontend, you can do this by specifying all the source files together on the command line. http://cdbug.org/undefined-reference/linker-error-undefined-reference-c.php This phrase indicates that you have a linker (ld) error, not a compiler error. Mistro116 [email protected] View Public Profile View LQ Blog View Review Entries View HCL Entries Find More Posts by [email protected]o.com 11-19-2005, 05:15 PM #7 Dave Kelly Member Registered: Aug V -- Please remove capital 'A's when replying by e-mail I do not respond to top-posted replies, please don't ask Oct 6 '06 #4 P: n/a owolablo I have actually included Undefined Reference To Main G++

You must have exactly one main per executable. For instance, even if you include the correct header files for all of your functions, you still need to provide your linker with the correct path to the library that has How to create a company culture that cares about information security? check my blog But it’s not magic – like all errors it means that you have done something wrong, in you code and/or your project’s configuration, and you need to take some time to

Undefined reference Put simply, the “undefined reference” error means you have a reference (nothing to do with the C++ reference type) to a name (function, variable, constant etc.) in your program Undefined Reference To Main Assembly It could not possibly have compiled, which means you couldn't get far enough to see the linker error that you report. Password Programming This forum is for all programming questions.

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How to unlink (remove) the special hardlink "." created for a folder? Thanks. To get the list of symbols in an object file or an executable, you can use nm. In Function Start Undefined Reference To Main Either post the code as part of your question, or narrow it down to a small example that illustrates the problem and post that. –Keith Thompson Nov 2 '11 at 3:58

Woops. –Nicole Apr 9 '13 at 15:05 Or just remove the -o option and use the conventional ./a.out, which is a beautiful name ;) –Tomasz Gandor Aug 5 '14 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 Why won't a series converge if the limit of the sequence is 0? news Compiler Errors undeclared identifier Example doy.cpp: In function `int main()': doy.cpp:25: `DayOfYear' undeclared (first use this function) doy.cpp:25: (Each undeclared identifier is reported only once for each function it appears in.)

you are fools for reopening a thread from two years ago. I'll go and try what you're saying thanks..! –Bran Stark Nov 1 '11 at 16:28 add a comment| up vote 2 down vote Executable file needs a main function. Please visit this page to clear all LQ-related cookies. Lack of research or effort.

Unfortunately, this means that if you leave off a semicolon, the compiler will interpret it as though the next thing in the program is intended to be a struct (or return more hot questions question feed lang-c about us tour help blog chat data legal privacy policy work here advertising info mobile contact us feedback Technology Life / Arts Culture / Recreation What happens if one brings more than 10,000 USD with them into the US? It doesn't say which struct was missing a semicolon.

This particular linker error differs from the other in that it may have nothing to do with including object files or having the correct paths to your libraries. Thanks. Fixed the title. –Fox Jan 28 '13 at 8:39 add a comment| 5 Answers 5 active oldest votes up vote 15 down vote This error tells you everything: undefined reference toHash::insert(int, Here is the list.h file that has simple headers: list.h #ifndef LIST_H #define LIST_H #include const int DEFAULT_CAPACITY = 100; class List { public: List(); List(int capacity); ~List(); void push_back(std::string

Think of it like changing basic variable names, they are just parameters in a function, which happens to be main, so thats not the problem. The problem is often that the variable is simply misspelled. Usually, the compilation process will begin with a series of compiler errors and warnings and, once you've fixed all of them, you'll then be faced with any linker errors. Oct 6 '06 #7 P: n/a Puppet_Sock owolablo wrote: I have actually included a definition to main.My project has two source files and the main functions in both of them are

For instance, the statement "for(;)" isn't correct syntax because a for loop always needs to have three parts. What is the probability that they were born on different days? Oct 9, 2014 - 09:18 PM (Reply to #2) 12345Total votes: 0 I'm not too sure what you mean. Mistro116 [email protected] View Public Profile View LQ Blog View Review Entries View HCL Entries Find More Posts by [email protected] 05-23-2009, 05:45 AM #11 akhil999in LQ Newbie Registered: Nov

Well, the key here is to think like the compiler; if the end of the file is unexpected, then it must be that it's waiting for something.