gcc error undefined reference to Walls Mississippi

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gcc error undefined reference to Walls, Mississippi

asked 2 years ago viewed 74109 times active 1 year ago Linked 0 c++ compilation error- undefined reference Related 64GCC C++ Linker errors: Undefined reference to 'vtable for XXX', Undefined reference If any of the symbols it exports are on the undefined list, the object is added to the link and the next step is executed. Note: -Wl,--no-as-needed isn't applied globally to everything that's linked, it's only applied to things that follow it in the command line order. Conference presenting: stick to paper material?

Email check failed, please try again Sorry, your blog cannot share posts by email. %d bloggers like this: Toggle navigation Eli Bendersky's website About Code Archives Library order in static linking 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 Is there any job that can't be automated? 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

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. If the object has been added to the link, it's treated as described above - its undefined and exported symbols get added to the symbol table. I am trying to create a shared object (.so) that exports one function, "external()". I am sure that these functions and variables are defined in the other modules.

share|improve this answer edited Mar 15 '14 at 18:01 answered Mar 15 '14 at 16:36 alk 45k53497 1 And probably something like -L$HOME/ffmpeg/lib in this case, since ffmpeg is in For example, in this C code: int imported(int); static int internal(int x) { return x * 2; } int exported(int x) { return imported(x) * internal(x); } The names of the Physically locating the server How to limit a xorg installation to a single video driver? Why does the state remain unchanged in the small-step operational semantics of a while loop?

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 Let's start with the most basic case, of linking two objects together: $ cat simplefunc.c int func(int i) { return i + 21; } $ cat simplemain.c int func(int); int main(int asked 4 years ago viewed 22060 times active 4 years ago Linked 0 “undefined reference to” for symbols in a shared library 117 Ubuntu Linux C++ error: undefined reference to 'clock_gettime' Why do train companies require two hours to deliver your ticket to the machine?

The reason for this is simple: even without us explicitly asking for it, gcc asks the linker to link the C library as well. How? When to use "bon appetit"? Change the file extension to '.c' (lowercase c) and add this file to your project again.

As I wrote, I really would appreciate any help. 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 Fill in your details below or click an icon to log in: Email (Address never made public) Name Website You are commenting using your WordPress.com account. (LogOut/Change) You are commenting using Animal Shelter in Java Is it plausible for my creature to have similar IQ as humans?

I then try to link against the .so but get "undefined reference 'external'". In the command I use the -L, -l and -rpath options which I thought was all that is needed for linking in linux. For example with gcc you might do this: gcc point.c testpoint.c Of course as others have pointed out, you also need to remove one of your main functions, since you can But any ideas about how can I implement this fix?

Thank you! Imagine that instead of simplefunc.c, the func symbol is provided thus: $ cat func_dep.c int bar(int); int func(int i) { return bar(i + 1); } $ cat bar_dep.c int func(int); int Ubuntu Ubuntu Insights Planet Ubuntu Activity Page Please read before SSO login Advanced Search Forum The Ubuntu Forum Community Ubuntu Specialised Support Development & Programming Programming Talk [SOLVED] compiling with gcc Thus, you will change the command to: gcc -g -O2 -fopenmp -L/usr/lib -o lenstool_tab e_nfwg.o lenstool_tab.o midpnt.o nrutil.o polint.o qromo.o read_bin.o lenstool_tab.o -lcfitsio -lm This should fix your problem.

Hint: just go over the linking process algorithm with this command-line. Appease Your Google Overlords: Draw the "G" Logo date: invalid date '2016-10-16' IQ Puzzle with no pattern How do I say "best practice" in Esperanto? 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 c gcc ld shared-libraries share|improve this question edited Jul 7 '12 at 12:11 octopusgrabbus 5,57772882 asked Nov 15 '11 at 17:26 Warren 80311120 1 Does gcc -L. -o program program.c

How to handle a senior developer diva who seems unaware that his skills are obsolete? If any symbol has already been in the exported list, we get a "multiple definition" error: two different objects export the same symbol and the linker is confused. ANSWER The GNU tools are case sensitive. If we link them in one order, we fail: $ gcc simplemain.o -L. -lbar_dep -lfunc_dep ./libfunc_dep.a(func_dep.o): In function 'func': func_dep.c:(.text+0x14): undefined reference to 'bar' collect2: ld returned 1 exit status However,

test.c #include main() { printf("Linuxquestions.org\n"); } so it seems I did something correct. But when I try to compile the file that I really want to use "vclient.c" I get an error message /tmp/ccuuPxtN.o(.text+0x3bc): In function `main': vclient.c: undefined reference to `initLog' Now as The linker goes over all the objects in the library. The filename may contain lowercase and uppercase characters.

So it means if my libA requires libB, in the linking specification, I must put –libA  ahead of –libB. If you are ever passing through the Alps I owe you a huge beer. Suppose we have this code: volatile char src[] = {1, 2, 3, 4, 5}; volatile char dst[50] = {0}; void* memcpy(void* dst, void* src, int len); int main(int argc, const char* Don't show this message again Change Settings Privacy Policy Update ARM’s Privacy Policy has been updated.

What is the reason for this error? I have installed gcc on a NSLU2. It depends on the order in which the objects and libraries in the project were fed to the linker. When the linker looks into the library it sees simplefunc.o that exports func.

What undefined symbols does the symbol table contain when the linker first sees -lfunc_dep? date: invalid date '2016-10-16' Chebyshev Rotation Flow Chart with tikzpicture: particular tipes of arrows How does NumPy solve least squares for underdetermined systems? Crash? But wait, there are exceptions!  We know that there are two possibilities for linking, static linking and dynamic linking.

How? Why does the state remain unchanged in the small-step operational semantics of a while loop? Edit: In a larger program, you typically compile and link separately to avoid re-compiling anything that hasn't changed. Is it illegal for regular US citizens to possess or read documents leaked by Wikileaks?

The time now is 03:25 AM. The full linker invocation command of gcc is pretty complex, and can be examined by passing the -### flag to gcc. Join them; it only takes a minute: Sign up C error: undefined reference to function, but it IS defined up vote 23 down vote favorite 8 Just a simple program, but Show that a nonabelian group must have at least five distinct elements Chebyshev Rotation When to use "bon appetit"?

The linker adds this undefined entry only after it sees main_using_memcpy.o. Even if it exports symbols that may be needed by some later library.