Uninitialized variables? Who needs warnings!

uninit.c

#include <stdio.h>

void foo(int bar);

void foo(int bar) {
	int lol;

	if (bar) {
		lol = 7;
	}

	if (lol == 7) {
		printf("haha, owned.\n");
	}
}

int main(int argc, char *argv[])
{
	(void)argv; /* silence. */
	foo(argc < 2);
	return 0;
}

/*

[16:08]rpearl@sihnon:~$ gcc --version
gcc (GCC) 4.7.0
Copyright (C) 2012 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

[16:08]rpearl@sihnon:~$ gcc -O3 -Wall -Wextra -pedantic uninit.c -o uninit
[16:08]rpearl@sihnon:~$ ./uninit
haha, owned.
[16:08]rpearl@sihnon:~$ ./uninit 1 2 3 4 5 6 7 8
haha, owned.
[16:08]rpearl@sihnon:~$ #However, clang has more sophisticated warnings.
[10:40]rpearl@sihnon:~$ clang --version
Apple clang version 3.1 (tags/Apple/clang-318.0.58) (based on LLVM 3.1svn)
Target: x86_64-apple-darwin10.8.0
Thread model: posix
[10:40]rpearl@sihnon:~$ clang -Weverything uninit.c -o uninit
uninit.c:12:6: warning: variable 'lol' may be uninitialized when used here
      [-Wconditional-uninitialized]
        if (lol == 7) {
            ^~~
uninit.c:6:9: note: initialize the variable 'lol' to silence this warning
        int lol;
               ^
                = 0
1 warning generated.

[10:40]rpearl@sihnon:~$ #Passing -Wall -Wextra to clang makes it gcc-compatible.

*/