34 lines · cpp
1// RUN: %clang_cc1 -fsyntax-only -verify -triple x86_64-apple-darwin %s2 3// This file tests -Wconstant-conversion, a subcategory of -Wconversion4// which is on by default.5 6constexpr int nines() { return 99999; }7 8void too_big_for_char(int param) {9 char warn1 = false ? 0 : 99999;10 // expected-warning@-1 {{implicit conversion from 'int' to 'char' changes value from 99999 to -97}}11 char warn2 = false ? 0 : nines();12 // expected-warning@-1 {{implicit conversion from 'int' to 'char' changes value from 99999 to -97}}13 14 char warn3 = param > 0 ? 0 : 99999;15 // expected-warning@-1 {{implicit conversion from 'int' to 'char' changes value from 99999 to -97}}16 char warn4 = param > 0 ? 0 : nines();17 // expected-warning@-1 {{implicit conversion from 'int' to 'char' changes value from 99999 to -97}}18 19 char ok1 = true ? 0 : 99999;20 char ok2 = true ? 0 : nines();21 22 char ok3 = true ? 0 : 99999 + 1;23 char ok4 = true ? 0 : nines() + 1;24}25 26void test_bitfield() {27 struct S {28 int one_bit : 1;29 } s;30 31 s.one_bit = 1; // expected-warning {{implicit truncation from 'int' to a one-bit wide bit-field changes value from 1 to -1}}32 s.one_bit = true; // no-warning33}34