One more addition;
If you declare x as volatile, i.e. volatile const int x=5;
then, even with Optimization, the result is 10.
Another thing, I observed with gdb, is that the variable ptr is actually eliminated during Optimization O2.
to confirm, compile the code as:
gcc -O2 -g -Wall test.c
Now run it in gdb:
gdb a.out
here, the listing will show the code as it is, but try: print *ptr It says, "No symbol "ptr" in the current context"
Regards, Harsha.
Joe Steeve wrote:
The following code assigns a value to a `const int` via a pointer.,
#include <stdio.h>
int main()
{
const int x=5;
int *ptr;
ptr = &x;
*ptr = 10;
printf("%d",x);
}
The code gives `10` for the following compilation
$gcc -o test test.c
It gives `5` when using optimisations switches.,
$gcc -o test -O2 test.c
Feature or bug or any explanation for this?
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