TI compiler does not emit clang error for: constexpr function never produces a constant expression

Some examples:

Clang and GCC emit errors:
test.cpp:10:17: error: constexpr function never produces a constant expression [-Winvalid-constexpr]
constexpr char* f(const char* p) {
^
For this test case:
constexpr char* f(const char* p)

Clang emits below error:
test.cpp:10:16: error: constexpr function never produces a constant expression [-Winvalid-constexpr]
constexpr bool f(void) {
For this test case:
#include <exception>
constexpr bool f(void)