https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70753
Bug ID: 70753
Summary: missing diagnostic in C11 mode: sizeof, _Alignof of
function type
Product: gcc
Version: 6.0
Status: UNCONFIRMED
Keywords: accepts-invalid
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: fw at gcc dot gnu.org
Target Milestone: ---
GCC accepts this code, but sizeof of a function type is invalid in C11 (and
likely earlier). It is a documented extension for GNU mode, but it is also
accepted with -std=c11.
#include <stdio.h>
int
f (int a, int b)
{
return a + b;
}
int
main (void)
{
printf ("%zu\n", sizeof (*f));
printf ("%zu\n", _Alignof (*f));
return 0;
}
The pedantic warning should be an error in C11 mode.
