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
Related
I have a header file included in the main but when I compile the main, I have an error saying that the linker failed.
I tried to find the object files but I cannot find them.
I think the problem may come from my machine. I am kind of a beginner so I don't know how to solve this
When I try compiling my code I get this error:
Undefined symbols for architecture x86_64:
"_intClassic", referenced from:
_main in main-53b7e4.o
"_intQuadrature", referenced from:
_main in main-53b7e4.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
#zwol #JonathanLeffer I have 3 files in my project main.c, integral.h
and integral.c. integral.c contains the code of the functions
intClassic and intQuadrature that allow me to calculate different
types of integral. In integral.h I declared the functions and
structures I use. Finally in the main I included integral.h .
Also $ gcc -o output file1.o file2.o can this command help me ?
In the same directory as your files, try running the command
gcc main.c integral.c -o integral
This should take the 2 files and compile them into a program called ./integral
I installed testu01 on my mac (OS El Capitan). I want to compile one of the examples using gcc, code below. But I get the following error, below. Did anybody run TestU01 on x86_64 successfully? Any other suggestions?
MacBook-Pro-2:examples Joan$ gcc -std=c99 -Wall -O3 -o birth1 birth1.c -I/Users/TestU01/TestU01-1.2.3/include -I/Users/TestU01/TestU01-1.2.3/mylib
Undefined symbols for architecture x86_64:
"_smarsa_BirthdaySpacings", referenced from:
_main in birth1-c99705.o
"_ulcg_CreateLCG", referenced from:
_main in birth1-c99705.o
"_ulcg_DeleteGen", referenced from:
_main in birth1-c99705.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 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.
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?
Ld /Users/ashutoshagarwal/Library/Developer/Xcode/DerivedData/c-cnyfflmvjyaashaoduqduqqsfegd/Build/Products/Debug/c normal x86_64
cd /Users/ashutoshagarwal/Desktop/c
setenv MACOSX_DEPLOYMENT_TARGET 10.9
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -arch x86_64 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.9.sdk -L/Users/ashutoshagarwal/Library/Developer/Xcode/DerivedData/c-cnyfflmvjyaashaoduqduqqsfegd/Build/Products/Debug -F/Users/ashutoshagarwal/Library/Developer/Xcode/DerivedData/c-cnyfflmvjyaashaoduqduqqsfegd/Build/Products/Debug -filelist /Users/ashutoshagarwal/Library/Developer/Xcode/DerivedData/c-cnyfflmvjyaashaoduqduqqsfegd/Build/Intermediates/c.build/Debug/c.build/Objects-normal/x86_64/c.LinkFileList -mmacosx-version-min=10.9 -framework Foundation -Xlinker -dependency_info -Xlinker /Users/ashutoshagarwal/Library/Developer/Xcode/DerivedData/c-cnyfflmvjyaashaoduqduqqsfegd/Build/Intermediates/c.build/Debug/c.build/Objects-normal/x86_64/c_dependency_info.dat -o /Users/ashutoshagarwal/Library/Developer/Xcode/DerivedData/c-cnyfflmvjyaashaoduqduqqsfegd/Build/Products/Debug/c
Undefined symbols for architecture x86_64:
"_add_history", referenced from:
_main in main.o
"_readline", referenced from:
_main in main.o
_source 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)
I am getting Apple-Mach-O Linker (Id) Error, have sent hours trying to fix this one, Dunno what to do.
It looks like you are using the GNU readline and GNU history libraries, which are available, by default, on the mac in libedit.dylib:
$ nm /usr/lib/libedit.dylib | fgrep readline
0000000000009899 T _readline
000000000001f444 D _readline_echoing_p
000000000001f400 D _rl_readline_name
000000000001f3f8 D _rl_readline_version
$ nm /usr/lib/libedit.dylib | fgrep add_history
000000000000acbc T _add_history
(the T indicates that the symbol is in the library's text section).
Therefore you need to add -ledit to your linker command line. If you are using Xcode then you can add libedit.dylib to the list of libraries to link against or if you are using make then you probably have to edit the LIBS variable in your Makefile.
The error message:
Undefined symbols for architecture x86_64: "_add_history", referenced from: _main in main.o
"_readline", referenced from: _main in main.o _source 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)'
Tells you that the linker cannot find the symbols readline and add_history. Without seeing your source code, and the precise linker and compiler command-lines, it's hard to speculate the exact cause. A likely cause is that you failed to link with external libraries, or other modules of your program.