Warning when using const pointer to fixed size array

[Aaron Rocha <hxdg21@yahoo.com>]

I am using :

$ gcc -dumpversion
4.2.4
$ gcc -dumpmachine
x86_64-linux-gnu

As expected, the following code does not generate any warnings when compiling with -Wall:

int main() {

   int number = 0;

   const int * const t = &number;

   return *t;
}

However, this code does:

int main() {

   int array[9] = {0};

   const int (* const p)[9] = &array;

   return (*p)[0];
}

$ gcc -Wall ./tst2.c 
./tst2.c: In function ‘main’:
./tst2.c:7: warning: initialization from incompatible pointer type

In order to eliminate this warning, I have to declare array as:

const int array[9];

Why is this the case though? In both examples, I am trying to use a const pointer to access a non-const variable for read-only purposes. Isn't this supposed to be OK?

Thanks



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