Probably a noob question but I can't find an answer to this. I've downloaded and installed Gstreamer for Mac from http://gstreamer.freedesktop.org/data/doc/gstreamer/head/manual/html/chapter-init.html
I copied the code for example 4.1, to initialize GStreamer, from
http://gstreamer.freedesktop.org/data/doc/gstreamer/head/manual/html/chapter-init.html into a file called eg41.c
and used the terminal command gcc eg41.c -I/Library/Frameworks/GStreamer.framework/Headers
. The output was:
Undefined symbols for architecture x86_64:
"_gst_init", referenced from: _main in eg41-9814a5.o
"_gst_version", referenced from: _main in eg41-9814a5.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
Any ideas?
Related
The problem is as follows.
I am trying to add two simple .obj files to my project. I have added a header file and I can see that obj is valid as Ttime structure, which is a part of obj is working. However, whenever I try to execute any function I get this error:
Undefined symbols for architecture x86_64:
"_printRES", referenced from:
_main in main.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
Error Screenshot
I tried to run a c file using Mac Terminal. So I put the following command in the Terminal.
gcc main.c
And the following message was shown.
Undefined symbols for architecture x86_64:
"_main", referenced from:
implicit entry/start for main executable
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
Prior to this, I also tried to build a C project in Eclipse, but this also showed an error. It says there is one error which is symbol(s) not found for architecture x86_64.
your program is missing the entry point (main function), you have to add this function to your code source.
int main(void){
printf("Hello World");
}
I am trying to use the code Nauty and Traces http://pallini.di.uniroma1.it/. But when I complied an example, say nautyex8.c (provided by the package), the following error showed up:
Undefined symbols for architecture x86_64:
"_alloc_error", referenced from:
_main in nautyex8-54d9da.o
"_densenauty", referenced from:
_main in nautyex8-54d9da.o
"_dispatch_graph", referenced from:
_main.options in nautyex8-54d9da.o
"_nauty_check", referenced from:
_main in nautyex8-54d9da.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
I am using Mac OS X Yosemite (10.10.5) and Xcode (version 7.1). I believe that there is no error in the codes because they are widely used so I guess the problem comes from my system settings.
Thank you so much!
I've just opened a pull request to make brew install nauty work on OS X: https://github.com/Homebrew/homebrew-core/pull/48701
Until then, here's how you would build nautyex8.c on OS X, as of Nauty/Traces 2.6r12.
Step 1 is to download the code and build the library:
wget http://pallini.di.uniroma1.it/nauty26r12.tar.gz
tar zxvf nauty26r12.tar.gz
cd nauty26r12
./configure
make
ls -l nauty.a
Step 2 is to compile nautyex8.c and link it against the library you just built:
gcc -O3 nautyex8.c nauty.a
./a.out
You probably forgot to put that "nauty.a" at the end of your compiler command line. If I do that too, I get:
gcc -O3 nautyex8.c
Undefined symbols for architecture x86_64:
"_alloc_error", referenced from:
_main in nautyex8-05f086.o
"_densenauty", referenced from:
_main in nautyex8-05f086.o
"_dispatch_graph", referenced from:
_main.options in nautyex8-05f086.o
"_nauty_check", referenced from:
_main in nautyex8-05f086.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
which exactly matches the symptom you described.
Yet another symbol(s) not found issue with Mac OS X. I wrote a C program that uses the libev event loop library that when compiled produces this output:
$ make
clang midnight.c midnight_logging.c -o midnight
Undefined symbols for architecture x86_64:
"_ev_default_loop", referenced from:
_main in midnight-Wlcawk.o
"_ev_io_start", referenced from:
_main in midnight-Wlcawk.o
"_ev_run", referenced from:
_main in midnight-Wlcawk.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [midnight] Error 1
I used homebrew to install libev. The shared library is in /usr/local/lib per normal and I've used every combination of compiler arguments including "-I /usr/local/lib", "-l libev" and "-L /usr/local/lib".
Assistance appreciated, I'd rather not have to statically compile.
But you do not link against libev! The compiler isn't a clairvoyant (nor is the linker), you have to tell it what to search for those symbols...
clang midnight.c midnight_logging.c -o midnight -lev
My code is identical to this question I asked earlier so there's no point in duplicating it here
This is the error I am getting:
Undefined symbols for architecture x86_64:
"_stdscr", referenced from:
_screen_init in screen.o
"_werase", referenced from:
_screen_init in screen.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
I've had this error in the past and I feel like it has something to do with a duplicate function name or something, but I have no idea how to debug this.
EDIT:
After adding the libncurses.dylib file to my project, the errors discussed above have disappeared, but a new error has emerged when I call screen_init(); in my main.cpp:
// main.cpp
#include "screen.h"
int main(){
screen_init();
}
// new error
Undefined symbols for architecture x86_64:
"screen_init()", referenced from:
_main in main.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
Pretty much the same error except now in my main. Is there another library I am missing? These errors are very mysterious and not very helpful.
I guess you need to add the library to your link phase, if you are going with XCode you should add it in project details:
choose project details
choose build phases tab
open link binary with libraries part
click the plus symbol
add libncurses.dylib to your project.