| // RUN: %clang_cc1 -triple=x86_64-pc-linux-gnu -fsyntax-only \ |
| // RUN: -Wtautological-unsigned-enum-zero-compare \ |
| // RUN: -verify=unsigned,unsigned-signed %s |
| // RUN: %clang_cc1 -triple=x86_64-pc-win32 -fsyntax-only \ |
| // RUN: -Wtautological-unsigned-enum-zero-compare \ |
| // RUN: -verify=unsigned-signed %s |
| // RUN: %clang_cc1 -triple=x86_64-pc-win32 -fsyntax-only \ |
| // RUN: -verify=silence %s |
| |
| // Okay, this is where it gets complicated. |
| // Then default enum sigdness is target-specific. |
| // On windows, it is signed by default. We do not want to warn in that case. |
| |
| int main() { |
| enum A { A_a = 0 }; |
| enum A a; |
| enum B { B_a = -1 }; |
| enum B b; |
| |
| // silence-no-diagnostics |
| |
| if (a < 0) // unsigned-warning {{comparison of unsigned enum expression < 0 is always false}} |
| return 0; |
| if (0 >= a) |
| return 0; |
| if (a > 0) |
| return 0; |
| if (0 <= a) // unsigned-warning {{comparison of 0 <= unsigned enum expression is always true}} |
| return 0; |
| if (a <= 0) |
| return 0; |
| if (0 > a) // unsigned-warning {{comparison of 0 > unsigned enum expression is always false}} |
| return 0; |
| if (a >= 0) // unsigned-warning {{comparison of unsigned enum expression >= 0 is always true}} |
| return 0; |
| if (0 < a) |
| return 0; |
| |
| if (a < 0U) // unsigned-signed-warning {{comparison of unsigned enum expression < 0 is always false}} |
| return 0; |
| if (0U >= a) |
| return 0; |
| if (a > 0U) |
| return 0; |
| if (0U <= a) // unsigned-signed-warning {{comparison of 0 <= unsigned enum expression is always true}} |
| return 0; |
| if (a <= 0U) |
| return 0; |
| if (0U > a) // unsigned-signed-warning {{comparison of 0 > unsigned enum expression is always false}} |
| return 0; |
| if (a >= 0U) // unsigned-signed-warning {{comparison of unsigned enum expression >= 0 is always true}} |
| return 0; |
| if (0U < a) |
| return 0; |
| |
| if (b < 0) |
| return 0; |
| if (0 >= b) |
| return 0; |
| if (b > 0) |
| return 0; |
| if (0 <= b) |
| return 0; |
| if (b <= 0) |
| return 0; |
| if (0 > b) |
| return 0; |
| if (b >= 0) |
| return 0; |
| if (0 < b) |
| return 0; |
| |
| if (b < 0U) // unsigned-signed-warning {{comparison of unsigned enum expression < 0 is always false}} |
| return 0; |
| if (0U >= b) |
| return 0; |
| if (b > 0U) |
| return 0; |
| if (0U <= b) // unsigned-signed-warning {{comparison of 0 <= unsigned enum expression is always true}} |
| return 0; |
| if (b <= 0U) |
| return 0; |
| if (0U > b) // unsigned-signed-warning {{comparison of 0 > unsigned enum expression is always false}} |
| return 0; |
| if (b >= 0U) // unsigned-signed-warning {{comparison of unsigned enum expression >= 0 is always true}} |
| return 0; |
| if (0U < b) |
| return 0; |
| |
| if (a == 0) |
| return 0; |
| if (0 != a) |
| return 0; |
| if (a != 0) |
| return 0; |
| if (0 == a) |
| return 0; |
| |
| if (a == 0U) |
| return 0; |
| if (0U != a) |
| return 0; |
| if (a != 0U) |
| return 0; |
| if (0U == a) |
| return 0; |
| |
| if (b == 0) |
| return 0; |
| if (0 != b) |
| return 0; |
| if (b != 0) |
| return 0; |
| if (0 == b) |
| return 0; |
| |
| if (b == 0U) |
| return 0; |
| if (0U != b) |
| return 0; |
| if (b != 0U) |
| return 0; |
| if (0U == b) |
| return 0; |
| |
| return 1; |
| } |
