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gcc compiler error undefined reference Waddington, New York

Join them; it only takes a minute: Sign up Why am I getting a gcc “undefined reference” error trying to create shared objects? Why is absolute zero unattainable? How exactly does the typical shell "fork bomb" calls itself twice? permissions on /etc/shadow Modulo % with big number- Infinity error - Javascript Flow Chart with tikzpicture: particular tipes of arrows Physically locating the server Compute the kangaroo sequence Is the NHS

Show that a nonabelian group must have at least five distinct elements In Harry Potter book 7, why didn't the Order flee Britain after Harry turned seventeen? This is a separate file called testpoint.c: #include "point.h" #include #include int main() { double x = 1; double y = 1; Point p = create(x, y); assert(p.x == Why is water evaporated from the ocean not salty? The linker neither knows nor cares about header files – it cares about .a and .lib files.

You typically store this in a file named Makefile, and to build your program, you just type make at the command line. Meaning of "oh freak" What (combination of) licenses is popular for public/shared proprietary software (“Feel free to contribute, but only we can make commercial use”)? Can I release a pattern without releasing the whole held expression? current community chat Stack Overflow Meta Stack Overflow your communities Sign up or log in to customize your list.

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. And if linking to the compiled library (A.so) via dlopen. What is the first movie to show this hard work message at the very end? It has always been thus, since the beginning of (Unix) time — some time in the 1970s, anyway. –Jonathan Leffler Nov 25 '13 at 1:42 It seems that the

Thank you! I have experimented with this for several cases, on my Ubuntu 9.10 Linux that comes with GCC 4.4.1. Once all the object files have been produced, the linker looks at them and works out what the final addresses of functions in the executable will be. more stack exchange communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed

Notify me of new posts via email. ← Previous post Next post → Pages CV Software Research Action/Activity Analysis Feature Fusion/ Optimization Subspace Search Subspace Segmentation Research Links Welcome Archives Archives Select Month October There are any number of reasons why it can’t find the definition – we’ll look at the commonest ones now. 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. Not the answer you're looking for?

Thank you everyone. –upswimsdn Apr 5 '11 at 22:51 1 Yes that was an additional problem I ran into, but the main problem was not compiling the two files together 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 In Harry Potter book 7, why didn't the Order flee Britain after Harry turned seventeen? I am trying to create a shared object (.so) that exports one function, "external()".

GCC version: gcc (Ubuntu/Linaro 4.6.3-1ubuntu5) 4.6.3 On Linux Mint 13 Thank you. Why do train companies require two hours to deliver your ticket to the machine? How should I interpret "English is poor" review when I used a language check service before submission? Send to Email Address Your Name Your Email Address Cancel Post was not sent - check your email addresses!

What a terrible(counter-intuitive, unexpected) bug/design-decision that is (to make the order of the options relative to the positional parameters significant) Conventionally options come first and other parameters follow. –Ribo Nov 24 share|improve this answer edited Apr 5 '11 at 22:59 answered Apr 5 '11 at 22:20 Jerry Coffin 320k31352745 This works, but is this generally how larger C programs are These IDEs offer you a number of project types such as “Windows Application” and “Console Application”. Email check failed, please try again Sorry, your blog cannot share posts by email. %d bloggers like this: Skip to content Follow: RSS Twitter Late Developer Random thoughts of an old

If you put the object files first, you don't run into this problem. Generate a 6 character string from a 15 character alphabet Why would a password requirement prohibit a number in the last character? You get is expanded with $(OBJS). It does the same for any libraries (.a and .lib files) you may be using.

linux gcc build linker share|improve this question edited Sep 5 '12 at 0:19 choroba 106k1089146 asked Sep 5 '12 at 0:01 Matthew Mitchell 1,48764789 Are you sure you want I have installed gcc on a NSLU2. Not the answer you're looking for? How to deal with sewage on a map with no water anywhere Does a survey require an ethical approval?

I have been for many years now. Referring to this introduction to GCC, http://www.network-theory.co.uk/docs/gccintro/gccintro_18.html the traditional behavior of linkers is to search for external functions from left to right in the libraries specified on the command line. Traditionally, linker technology has lagged behind compilers, mostly because it’s generally more fun to build a compiler than to build a linker. Meaning of "oh freak" Create a wire coil What actually are virtual particles?

I'd guess GCC 4.2 era being approximately the cutover. –Flexo♦ Jun 11 at 8:11 add a comment| Your Answer draft saved draft discarded Sign up or log in Sign up The whole point of static linking (with static libraries that ends with .a), on the other hand, is to put the priority on portability by copying the content of the dependent Why microcontroller takes many clock cycles to start up with PLL clock source? Actually I dug a little deeper and found another makefile in the directory with those c programs, and found a similar line to put -lm on, but it's still not showing

Join them; it only takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the Linker 101 To understand the linker, you have to understand how C++ programs are built. The time now is 03:18 AM. Is there any way to know when NOT to use my Oyster card?

Exploded Suffixes 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 Conference presenting: stick to paper material? The second point is much trickier and not easy to detect. Radius of Convergence of Infinite Series reading through the definition of `\cfrac` in AMSMath how can you tell if the engine is not brand new?

So be wary of it. –picoCreator Jan 3 '13 at 9:12 "Recent versions" - any chance you know exactly which one introduced this change? –Nathan Osman Jun 11 at No Definition Probably the most common reason for unresolved reference errors is that you simply have not defined the thing you are referencing. Book of zen kōans IQ Puzzle with no pattern With the passing of Thai King Bhumibol, are there any customs/etiquette as a traveler I should be aware of? This is where the the linker comes in.

For details and our forum data attribution, retention and privacy policy, see here UbuntuCommunityAsk!DeveloperDesignDiscourseHardwareInsightsJujuShopMore ›AppsHelpForumLaunchpadMAASCanonical current community chat Ask Ubuntu Ask Ubuntu Meta your communities Sign up or log in to Putting pin(s) back into chain Where are sudo's insults stored? I checked that these codes do contain #include. Generate a 6 character string from a 15 character alphabet How much interest should I pay on a loan from a friend?

So to me everything looks OK! Running gcc -o test test.c brings no error and afterwards I can run the program test with ./test. Putting pin(s) back into chain What is the first movie to show this hard work message at the very end? up vote 4 down vote favorite 1 My compilation process throws around errors like ..undefined reference to `BN_cmp' although I include and run gcc -lssl -lcrypto test.c -o test can