Falk Hueffner wrote:
Jason Kraftcheck <kraftche@cae.wisc.edu> writes:If the following is compiled with the options -Wall -pedantic-errors : #include <stdio.h> int main( ) { int i; printf("%p\n", &i ); return 0; } gcc emits the following: voidptr.c: In function `main': voidptr.c:5: warning: void format, different type arg (arg 2) This warning is meaningless. The type of the pointer doesn't matter for printf to write out the address.According to the C standard, it does. And you specifically asked for gcc to be pedantic.
The C standard says there's a difference between printing a void* and a int* (or any other type)? How can a pointer passed through a var-args list be anything but a void*? The C standard may say that %p prints a void*, but isn't any pointer passed through a var-args a void*?
An implicit cast to a void* doesn't generate a warning under other circumstances. Neither do other implicit casts in var-args lists. The following compiled with '-Wall -pedantic-errors" does not result in any warnings:
int main()
{
float f;
memset( &f, 0, sizeof(f)); /* implicit cast to void* */
printf("%f\n", f); /* promotion from float to double */
return 0;
}