gcc library linking error Vineland New Jersey

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gcc library linking error Vineland, New Jersey

So let's assume we have the following scenario: myprog.o - containing main() function, dependent on libmysqlclient libmysqlclient - static, for the sake of the example (you'd prefer the shared library, of Each component can be treated as one library - if any one library from the component is needed, the dependency cycle(s) will cause all libraries in that component to be needed. main assumes it gets the correct memcpy from the C library, but the memcpy it gets linked with does something else. But still getting the same error.

vBulletin 2000 - 2016, Jelsoft Enterprises Ltd. Join Date Jun 2014 Posts 4 This is the Makefile im using Code: CC=gcc CFLAGS=-O3 -Wall LDFLAGS=-lpci test: test.o ${CC} ${CFLAGS} ${LDFLAGS} -o [email protected] $^ test.o: test.c ${CC} ${CFLAGS} -c $< Here is an example of the implications if you miss to specify the dependencies for libb.so $ export LD_LIBRARY_PATH=. # not needed if libs go to /usr/lib etc $ g++ -fpic And if someone else loads libb using dlopen at runtime (think of loading plugins dynamically), the call will fail aswell.

By convention the names of library files are prefixed with lib and (in their static form) have a .a extension. As I wrote, I really would appreciate any help. How do I say "best practice" in Esperanto? Flags passed to the linker can tweak this process - again, we'll see some examples later.

Common files shared by all below commands $ cat a.cpp extern int a; int main() { return a; } $ cat b.cpp extern int b; int a = b; $ cat Join 59 other followers Blog at WordPress.com. %d bloggers like this: Products Download Events Support All Product Families ARM7, ARM9, and Cortex-M3 Products C16x, XC16x, and ST10 Products C251 and If you are ever passing through the Alps I owe you a huge beer. 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.

My recent archlinux distribution doesn't use this flag by default, so it didn't give an error for not following the correct order. 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. Unsubstantiated How does NumPy solve least squares for underdetermined systems? The linker would look for the prototype's implementation in the .o file produced by compiling the library Does your build process compile the library .c file?

share|improve this answer answered Mar 21 '14 at 10:07 eckes 29.9k9100142 Due to SO's re-ordering, this 'answer' does not make very much sense appearing at the top as it Linking is already a critical part of the compilation time of large systems, since it looks at the whole program and requires quite a bit of memory. Subscribed! We can pass them to the linker in reversed order and it still works: $ gcc simplemain.o simplefunc.o $ ./a.out ; echo $? 22 Now let's do something different.

share|improve this answer edited Jan 5 '12 at 3:30 answered Jan 3 '09 at 17:21 casualcoder 2,21531933 2 Is this something with only gnu ld/gcc? How? This is the linking order. It does on my Ubuntu system.

Depending on different linkers HP/Intel/GCC/SUN/SGI/IBM/etc you can get unresolved functions/variables etc, on some platforms you have to list libraries twice. g++ -o foobar -Xlinker -start-group -Xlinker libA.a -Xlinker libB.a -Xlinker libC.a -Xlinker -end-group is ALMOST equal to g++ -o foobar -Xlinker -start-group -Xlinker libC.a -Xlinker libB.a -Xlinker libA.a -Xlinker -end-group Careful I'll try this when I'm next able to... –Matthew Mitchell Sep 5 '12 at 0:12 Yes, worked perfectly thank you. –Matthew Mitchell Sep 5 '12 at 20:23 3 How to show hidden files in Nautilus 3.20.3 Ubuntu 16.10?

Consider a linker invocation: $ gcc main.o -L/some/lib/dir -lfoo -lbar -lbaz The linker is almost always invoked through the compiler driver gcc when compiling C or C++ code. I've tried a completely different library (GMP) and had the EXACT same problem. I'm first creating the .o files then linking them in a separate command. share|improve this answer answered Sep 27 '08 at 12:33 Remo.D 12k33257 add a comment| up vote 1 down vote Post your makefile, and the library function you are trying to call.

But obviously I am missing something fundamental. For example: /* myapp.h ** Here I will include and define my stuff */ ... #include "mylib.h" ... Browse other questions tagged ubuntu build compiler-errors static-libraries linker-error or ask your own question. It's better to make it as fast as possible for well-behaved programs (that got their linking order right), and provide special options like groups for the difficult circular dependency cases.

Why microcontroller takes many clock cycles to start up with PLL clock source? Code: /home/dark/Temp/libpci-test# nm -D /usr/lib/x86_64-linux-gnu/libpci.so U access U close U closedir U __ctype_b_loc w __cxa_finalize U __errno_location U exit U fclose U ferror U fflush U fgets U fopen U __fprintf_chk The library reference has to be listed after the ".o" file, since the linker/loader processes the arguments in order. But AA can't come both before and after BB on the command-line, right?

Adv Reply February 14th, 2011 #2 Arndt View Profile View Forum Posts Private Message Ubuntu Cappuccino Scuro Join Date May 2006 Beans 1,787 Re: compiling with gcc and "undefined reference As I wrote, I really would appreciate any help. When I look in common.h I find int initLog(int useSyslog, char *logfile,int debugSwitch); and looking in common.c (also in the same directory) I find int initLog(int useSyslog, char *logfile,int debugSwitch) { No .so files at all.

This was bugging me to so started up a Virtualbox VM and installed the packages, then tried to compile the code. On my system, running the command on libm.a gives me output like the following. 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 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

Ask Ubuntu works best with JavaScript enabled FAQ Forum Quick Links Unanswered Posts New Posts View Forum Leaders FAQ Contact an Admin Forum Community Forum Council FC Agenda Forum Governance Forum The time now is 03:12 AM. When the linker encounters a new object file, it looks at: The symbols it exports: these are added to the list of exported symbols mentioned above. Why was the identity of the Half-Blood Prince important to the story?

Also, FWIW, I always uses parens around my Makefile variables, so I never new things like "${CC}" worked... But this is a very simple case. This explains why the linking process is the way it is.