Adv Reply June 12th, 2012 #3 hasanalikhattak View Profile View Forum Posts Private Message 5 Cups of Ubuntu Join Date Feb 2011 Beans 21 Re: undefined reference to 'function' Originally Unless matrixsslApi.h is not part of the gcc or g++ compile line? simplemain.o -lfunc_dep -lbar_dep -lfunc_dep $ ./a.out ; echo $? 24 Another quiz: will the same trick work providing -lbar_dep twice? No Library To understand this issue, remember that a header file (.h) is not a library. http://cdbug.org/undefined-reference/linker-error-undefined-reference-c.php
This is because the driver knows how to provide the correct command-line arguments to the linker itself (ld) with all the support libraries, etc. Why do people move their cameras in a square motion? Directories named by -I are searched before the standard system include directories. The answer is: it depends - the result can be either correct or a segmentation fault. check it out
Source files contain objects and function definitions, which are the data and routines that make up your program or library. Listing 2.9 (tifftest.c) Using libtiff #include
asked 5 years ago viewed 20866 times active 7 months ago Linked 6 Undefined reference to symbol, even though the library is linked 2 gcc newly installed libraries (libexpat1-dev) not recognised However, substantial reasons exist to use static archives instead. 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. Linking Error Undefined Reference To Function Just as a quick reminder - an object file both provides (exports) external symbols to other objects and libraries, and expects (imports) symbols from other objects and libraries.
Join 59 other followers Create a free website or blog at WordPress.com. %d bloggers like this: Undefined Reference To Function In Static Library Why is JK Rowling considered 'bad at math'? Join them; it only takes a minute: Sign up Undefined reference to symbol, even though the library is linked up vote 6 down vote favorite 3 When linking a project I Here's how this helps in our case: $ gcc simplemain.o -L. -Wl,--start-group -lbar_dep -lfunc_dep -Wl,--end-group $ ./a.out ; echo $? 24 It's interesting to note the "significant performance cost" warning in
The linker then uses this file as if it had been specified precisely by name. Undefined Reference To Library Function Here's how you would combine test1.o and test2.o into a single libtest.a archive: % ar cr libtest.a test1.o test2.o The cr flags tell ar to create the archive.  Now you Using this to build a hash table with set size. If you're writing the code in your shared library in C++, you will probably want to declare those functions and variables that you plan to access elsewhere with the extern "C"
The dlclose function unloads the shared library. ScruffR 2015-10-01 20:30:35 UTC #18 Yep, hence (9/24/2015) ScruffR: But maybe @suda might have some clue about possible interna of the Web IDE that might play a role here. Undefined Reference To Function In Shared Library Name spelling on publications Soft question: What exactly is a solver in optimization? Undefined Reference To Library C++ And the id enum not being found.
Header files mostly exist for the purpose of compile-time type checking, and do not exist after the compilation process. (This is an oversimplification but I think it will do for now.) More about the author With your command you link your program agains a static library, in the format libOpenCL.a. Do you want to help us debug the posting issues ? < is the place to report it, thanks ! If you unmet have references, you do get an error. Undefined Reference To Function C++
I get the same error if I type the gcc command directly and skip the makefile, I also made sure the static library got compiled with gcc as well. because i think i am linking it in compilation using Code: /usr/bin/g++ -I/usr/include/libxml2 -Xlinker -zmuldefs -fPIC -c a.cpp /usr/bin/g++ -I/usr/include/libxml2 -Xlinker -zmuldefs -fPIC -c b.cpp /usr/bin/g++ -I/usr/include/libxml2 -Xlinker -zmuldefs -fPIC -c What to do with my out of control pre teen daughter Why did Fudge and the Weasleys come to the Leaky Cauldron in the PoA? check my blog Conclusion The unresolved reference error can have many causes, far from all of which have been described here.
For instance, if the C++ function my_function is in a shared library and you want to access it with dlsym, you should declare it like this: extern "C" void foo (); Ld Undefined Reference To Function Jul 9, 2014 at 10:13pm UTC StarAD (3) Thanks for the quick response, I didnt know that ;) I am still having the same problems, I think I am using the I have downloaded and built the library, I have done a 'make install' to put the resulting .a file into /usr/lib/ and the .h files into /usr/include It appears to be
Let's see what comes out of it. Last edited on Jul 9, 2014 at 3:38pm UTC Jul 9, 2014 at 4:22pm UTC keskiverto (5784) When you compile a library in Windows or OSX, you do link it. Is it possible to keep publishing under my professional (maiden) name, different from my married legal name? Undefined Reference C++ The linker searches a standard list of directories for the library, which is actually a file named liblibrary.a.
Related From → c, c++, devtools Leave a Comment Leave a Reply Cancel reply Enter your comment here... Back to the original example Let's go back to the example this article started with. You can use the -static option to demand static archives. news Here's what the linker does: The linker maintains a symbol table.
i started as follows: i have a application which i have compiled using Code: /usr/bin/g++ -I/usr/include/libxml2 -fpermissive -ffriend-injection -Wformat -Wno-deprecated -Xlinker -zmuldefs -fPIC -c abc.cpp then i have created a shared This in itself is important, because a horde of object files is not convenient to deal with.