// RUN: %clang_cc1 -std=c++11 -triple=x86_64-pc-linux-gnu -fsyntax-only -DUNSIGNED -verify %s // RUN: %clang_cc1 -std=c++11 -triple=x86_64-pc-win32 -fsyntax-only -DSIGNED -verify %s // RUN: %clang_cc1 -std=c++11 -triple=x86_64-pc-win32 -fsyntax-only -DSILENCE -Wno-tautological-unsigned-enum-zero-compare -verify %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_foo = 0, A_bar, }; enum A a; enum B : unsigned { B_foo = 0, B_bar, }; enum B b; enum C : signed { C_foo = 0, C_bar, }; enum C c; #ifdef UNSIGNED if (a < 0) // expected-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) // expected-warning {{comparison of 0 <= unsigned enum expression is always true}} return 0; if (a <= 0) return 0; if (0 > a) // expected-warning {{comparison of 0 > unsigned enum expression is always false}} return 0; if (a >= 0) // expected-warning {{comparison of unsigned enum expression >= 0 is always true}} return 0; if (0 < a) return 0; if (a < 0U) // expected-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) // expected-warning {{comparison of 0 <= unsigned enum expression is always true}} return 0; if (a <= 0U) return 0; if (0U > a) // expected-warning {{comparison of 0 > unsigned enum expression is always false}} return 0; if (a >= 0U) // expected-warning {{comparison of unsigned enum expression >= 0 is always true}} return 0; if (0U < a) return 0; if (b < 0) // expected-warning {{comparison of unsigned enum expression < 0 is always false}} return 0; if (0 >= b) return 0; if (b > 0) return 0; if (0 <= b) // expected-warning {{comparison of 0 <= unsigned enum expression is always true}} return 0; if (b <= 0) return 0; if (0 > b) // expected-warning {{comparison of 0 > unsigned enum expression is always false}} return 0; if (b >= 0) // expected-warning {{comparison of unsigned enum expression >= 0 is always true}} return 0; if (0 < b) return 0; if (b < 0U) // expected-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) // expected-warning {{comparison of 0 <= unsigned enum expression is always true}} return 0; if (b <= 0U) return 0; if (0U > b) // expected-warning {{comparison of 0 > unsigned enum expression is always false}} return 0; if (b >= 0U) // expected-warning {{comparison of unsigned enum expression >= 0 is always true}} return 0; if (0U < b) return 0; if (c < 0) return 0; if (0 >= c) // expected-warning {{comparison 0 >= 'enum C' is always true}} return 0; if (c > 0) // expected-warning {{comparison 'enum C' > 0 is always false}} return 0; if (0 <= c) return 0; if (c <= 0) // expected-warning {{comparison 'enum C' <= 0 is always true}} return 0; if (0 > c) return 0; if (c >= 0) return 0; if (0 < c) // expected-warning {{0 < 'enum C' is always false}} return 0; if (c < 0U) // expected-warning {{comparison of unsigned enum expression < 0 is always false}} return 0; if (0U >= c) return 0; if (c > 0U) return 0; if (0U <= c) // expected-warning {{comparison of 0 <= unsigned enum expression is always true}} return 0; if (c <= 0U) return 0; if (0U > c) // expected-warning {{comparison of 0 > unsigned enum expression is always false}} return 0; if (c >= 0U) // expected-warning {{comparison of unsigned enum expression >= 0 is always true}} return 0; if (0U < c) return 0; #elif defined(SIGNED) if (a < 0) return 0; if (0 >= a) // expected-warning {{comparison 0 >= 'enum A' is always true}} return 0; if (a > 0) // expected-warning {{comparison 'enum A' > 0 is always false}} return 0; if (0 <= a) return 0; if (a <= 0) // expected-warning {{comparison 'enum A' <= 0 is always true}} return 0; if (0 > a) return 0; if (a >= 0) return 0; if (0 < a) // expected-warning {{comparison 0 < 'enum A' is always false}} return 0; if (a < 0U) // expected-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) // expected-warning {{comparison of 0 <= unsigned enum expression is always true}} return 0; if (a <= 0U) return 0; if (0U > a) // expected-warning {{comparison of 0 > unsigned enum expression is always false}} return 0; if (a >= 0U) // expected-warning {{comparison of unsigned enum expression >= 0 is always true}} return 0; if (0U < a) return 0; if (b < 0) // expected-warning {{comparison of unsigned enum expression < 0 is always false}} return 0; if (0 >= b) return 0; if (b > 0) return 0; if (0 <= b) // expected-warning {{comparison of 0 <= unsigned enum expression is always true}} return 0; if (b <= 0) return 0; if (0 > b) // expected-warning {{comparison of 0 > unsigned enum expression is always false}} return 0; if (b >= 0) // expected-warning {{comparison of unsigned enum expression >= 0 is always true}} return 0; if (0 < b) return 0; if (b < 0U) // expected-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) // expected-warning {{comparison of 0 <= unsigned enum expression is always true}} return 0; if (b <= 0U) return 0; if (0U > b) // expected-warning {{comparison of 0 > unsigned enum expression is always false}} return 0; if (b >= 0U) // expected-warning {{comparison of unsigned enum expression >= 0 is always true}} return 0; if (0U < b) return 0; if (c < 0) return 0; if (0 >= c) // expected-warning {{comparison 0 >= 'enum C' is always true}} return 0; if (c > 0) // expected-warning {{comparison 'enum C' > 0 is always false}} return 0; if (0 <= c) return 0; if (c <= 0) // expected-warning {{comparison 'enum C' <= 0 is always true}} return 0; if (0 > c) return 0; if (c >= 0) return 0; if (0 < c) // expected-warning {{0 < 'enum C' is always false}} return 0; if (c < 0U) // expected-warning {{comparison of unsigned enum expression < 0 is always false}} return 0; if (0U >= c) return 0; if (c > 0U) return 0; if (0U <= c) // expected-warning {{comparison of 0 <= unsigned enum expression is always true}} return 0; if (c <= 0U) return 0; if (0U > c) // expected-warning {{comparison of 0 > unsigned enum expression is always false}} return 0; if (c >= 0U) // expected-warning {{comparison of unsigned enum expression >= 0 is always true}} return 0; if (0U < c) return 0; #else if (a < 0) return 0; if (0 >= a) // expected-warning {{comparison 0 >= 'enum A' is always true}} return 0; if (a > 0) // expected-warning {{comparison 'enum A' > 0 is always false}} return 0; if (0 <= a) return 0; if (a <= 0) // expected-warning {{comparison 'enum A' <= 0 is always true}} return 0; if (0 > a) return 0; if (a >= 0) return 0; if (0 < a) // expected-warning {{comparison 0 < 'enum A' is always false}} return 0; if (a < 0U) return 0; if (0U >= a) return 0; if (a > 0U) return 0; if (0U <= 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 <= 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; if (b <= 0U) return 0; if (0U > b) return 0; if (b >= 0U) return 0; if (0U < b) return 0; if (c < 0) return 0; if (0 >= c) // expected-warning {{comparison 0 >= 'enum C' is always true}} return 0; if (c > 0) // expected-warning {{comparison 'enum C' > 0 is always false}} return 0; if (0 <= c) return 0; if (c <= 0) // expected-warning {{comparison 'enum C' <= 0 is always true}} return 0; if (0 > c) return 0; if (c >= 0) return 0; if (0 < c) // expected-warning {{0 < 'enum C' is always false}} return 0; if (c < 0U) return 0; if (0U >= c) return 0; if (c > 0U) return 0; if (0U <= c) return 0; if (c <= 0U) return 0; if (0U > c) return 0; if (c >= 0U) return 0; if (0U < c) return 0; #endif return 1; } namespace crash_enum_zero_width { int test() { enum A : unsigned { A_foo = 0 }; enum A a; // used to crash in llvm::APSInt::getMaxValue() #ifndef SILENCE if (a < 0) // expected-warning {{comparison of unsigned enum expression < 0 is always false}} #else if (a > 0) #endif return 0; return 1; } } // namespace crash_enum_zero_width