[LLVMdev] Request for help: why does the program link correctly?

[Soumitra Chatterjee]

Hi,
	I am a bit stumped on the following case, and hopefully missing 
something very basic. Can someone please help me understand why the 
following is allowed to link correctly?

$ cat -n main.c
      1  extern void foo();
      2
      3  int main() { foo(); }

$ cat -n def.c
      1  int foo = 99;

$ clang main.c def.c ; echo $?
0

I guess the answer depends on why is 'main.c::foo' not marked as func?

$ clang -c main.c def.c
$ readelf -s main.o def.o | grep foo
      9: 0000000000000000     0 NOTYPE  GLOBAL DEFAULT  UND foo
      7: 0000000000000000     4 OBJECT  GLOBAL DEFAULT    2 foo

Thanks,
Soumitra