I was trying to compile helloworld.c in Eclipse Oxygen.1 on Mac 10.12.6
#include <stdio.h>
#include <stdlib.h>
int main(){
printf("Hello World!");
return 0;
}
and it throws such an error:
20:41:02 **** Incremental Build of configuration Debug for project HelloWorld ****
make all
Building target: HelloWorld
Invoking: Cross GCC Linker
gcc -o "HelloWorld" ./helloworld.o
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)
make: *** [HelloWorld] Error 1
20:41:03 Build Finished (took 938ms)
I am quite sure that the problem isn't the code itself, but what?
Related
I am doing Harvard CS50 c course. When I type make file in the terminal it throws me this error:
Undefined symbols for architecture arm64:
"_get_string", referenced from:
_main in hello-c42e93.o
ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [hello] Error 1
hello.c:
#include <cs50.h>
#include <stdio.h>
int main(void)
{
string answer = get_string("What's your name? ");
printf("hello, answer\n");
}
I installed cs50.h library through this steps https://github.com/cs50/libcs50
I am using macOS Ventura 13.1
edit: here is the link of a cs50 library https://github.com/cs50/libcs50/tree/main/src
As #LHLaurini mentioned above you need to link with the cs50 library which contains the definition of the function get_string():
clang hello.c -o hello -lcs50
You didn't supply the Makefile but usually you can set this variable which is used in a implicit link rule:
LDLIBS := -lcs50
I am a beginner and trying to learn C.
I am looking at the Harvard edX course, but I am running into an issue. Whenever I run make test, it is resulting in the following error:
cc test.c -o test
Undefined symbols for architecture arm64:
"_get_string", referenced from:
_main in test-d904ae.o
ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [test] Error 1
Here is my code:
#include <stdio.h>
#include <cs50.h>
int main(void)
{
string name = get_string("enter: ");
printf("%s\n", name);
}
The get_string function is from the cs50.h. I know that there is way around this my using clang test.c -o test -lc50. However, it is being said that make does all of that, and I would like to know what is wrong so that I can use make instead of clang test.c -o test -lcs50.
I try to compile C files in vim environment but It occurs on error that
Undefined symbols for architecture arm64:
"_main", referenced from:
implicit entry/start for main executable
ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
My command is
gcc [filename.c] -o [filename]
and my file is
#include <unistd.h>
void ft_putchar(char c)
{
write(1, &c, 1);
}
It is just simple code for checking compile.
But it didn't work.
So I wondering that what is the critical problem that occurs problem.
My command or M1 mac?
Of course I install gcc through 'HOMEBREW'.
Thank you.
I am getting the following linker error:
Source (hello_world.c):
#include <stdio.h>
int main(){
printf("hello world\n");
return 0;
}
Compilation:
$ gcc hello_world.c
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)
$
I'm trying to compile the following libusb snippet on my Mac:
#include <stdio.h>
#include <stdlib.h>
#include <libusb.h>
int main(void) {
libusb_device **devices;
ssize_t device_count = 0;
device_count = libusb_get_device_list(NULL, &devices);
printf("%d devices found\n", (int)device_count);
return EXIT_SUCCESS;
}
I have libusb installed via Homebrew.
I'm getting the following error during compilation:
ld: symbol(s) not found for architecture x86_64
The full compiler output is as follows:
22:28:24 **** Incremental Build of configuration Debug for project libusb ****
make all
Building file: ../src/libusb.c
Invoking: Cross GCC Compiler
gcc -I/usr/local/Cellar/libusb/1.0.9/include/libusb-1.0/ -O0 -g3 -Wall -c -fmessage-length=0 -MMD -MP -MF"src/libusb.d" -MT"src/libusb.d" -o "src/libusb.o" "../src/libusb.c"
Finished building: ../src/libusb.c
Building target: libusb
Invoking: Cross GCC Linker
gcc -o "libusb" ./src/libusb.o
Undefined symbols for architecture x86_64:
"_libusb_get_device_list", referenced from:
_main in libusb.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: *** [libusb] Error 1
22:28:24 Build Finished (took 119ms)
I understand the problem is to do with the linker not finding the libusb library, right? How do I tell the compiler where that is in Eclipse CDT?
As we worked out in all the comments the link command that worked is
gcc -L/usr/local/Cellar/libusb/1.0.9/lib -o "libusb_example" ./src/libusb_example.o -lusb1.0