Tests: Prevent compiler optimizing away test code in CTestTestCrash
The CTestTestCrash tries to force a crash by dereferencing a NULL pointer. The oneAPI 2021.4 C compiler notices that the pointer and the value fetched from the pointer are never used and optimizes away the dereferencing of the NULL pointer, which prevents the crash, causing the test to fail.
This change adds the volatile
keyword the pointer to prevent the
compiler optimizing it away. Removing a reference to a volatile
variable is illegal because access to a volatile
variable could have
side effects not observable by the compiler.
Edited by Brad King