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int printHelloWorld() { printf("Hello World"); return 0; }
static int testVar = printHelloWorld();
int main ()
{
    return 0;
}

prog.c: In function 'printHelloWorld':
prog.c:1:25: warning: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
 int printHelloWorld() { printf("Hello World"); return 0; }
                         ^
prog.c:1:25: warning: incompatible implicit declaration of built-in function 'printf'
prog.c:1:25: note: include '<stdio.h>' or provide a declaration of 'printf'
prog.c: At top level:
prog.c:2:22: error: initializer element is not constant
 static int testVar = printHelloWorld();
                      ^
prog.c:2:12: warning: 'testVar' defined but not used [-Wunused-variable]
 static int testVar = printHelloWorld();
            ^

Standard output is empty