I'm trying to generate a static library and link it with an execution binary.
This is a library function:
#include <stdio.h>
int hello() {
return 10;
}
With these commands, I could get a static library.
gcc -c io.c
ar -crv libio.a io.o
With lip -info, I checked it is x86_64 architecture.
ar> lipo -info libio.a
input file libio.a is not a fat file
Non-fat file: libio.a is architecture: x86_64
This is the main function that uses the library.
#include <stdio.h>
extern int hello();
int main(int argc, char *argv[]) {
printf("%d", hello());
}
However, when I link the object with the static library, I have errors.
gcc main.c -lio -o main -L.
Error messages are:
ld: warning: ignoring file ./libio.a, file was built for archive which is not the architecture being linked (x86_64): ./libio.a
Undefined symbols for architecture x86_64:
"_hello", referenced from:
_main in main-2c41a0.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 use the ar as in /bin/ar, and Mac OS X is 10.10.2 with clang-602.0.53.
ar> clang -v
Apple LLVM version 6.1.0 (clang-602.0.53) (based on LLVM 3.6.0svn)
Target: x86_64-apple-darwin14.3.0
Thread model: posix
What might be wrong?