Should clang and gcc produce a diagnostic message when a program does pointer arithmetic on a function pointer?

Question

This program compiles without errors, for example with clang -Wall -std=c11 a.c and gcc -Wall -std=c11 a.c. Is this a bug in clang and gcc? Because ari

Answer 1

Function pointer arithmetic is a gcc extension also implemented by clang.

To invoke standards compliance you need

gcc -std=c11 -pedantic ...
clang -std=c11 -pedantic ...