constant-conversion.c revision 15d7d12226f83de24f96f4bf4e27ebba30fef51e
1// RUN: %clang_cc1 -fsyntax-only -verify -triple x86_64-apple-darwin %s 2 3// This file tests -Wconstant-conversion, a subcategory of -Wconversion 4// which is on by default. 5 6// rdar://problem/6792488 7void test_6792488(void) { 8 int x = 0x3ff0000000000000U; // expected-warning {{implicit conversion from 'unsigned long' to 'int' changes value from 4607182418800017408 to 0}} 9} 10 11void test_7809123(void) { 12 struct { int i5 : 5; } a; 13 14 a.i5 = 36; // expected-warning {{implicit truncation from 'int' to bitfield changes value from 36 to 4}} 15} 16 17void test() { 18 struct { int bit : 1; } a; 19 a.bit = 1; // shouldn't warn 20} 21 22enum Test2 { K_zero, K_one }; 23enum Test2 test2(enum Test2 *t) { 24 *t = 20; 25 return 10; // shouldn't warn 26} 27 28void test3() { 29 struct A { 30 unsigned int foo : 2; 31 int bar : 2; 32 }; 33 34 struct A a = { 0, 10 }; // expected-warning {{implicit truncation from 'int' to bitfield changes value from 10 to 2}} 35 struct A b[] = { 0, 10, 0, 0 }; // expected-warning {{implicit truncation from 'int' to bitfield changes value from 10 to 2}} 36 struct A c[] = {{10, 0}}; // expected-warning {{implicit truncation from 'int' to bitfield changes value from 10 to 2}} 37 struct A d = (struct A) { 10, 0 }; // expected-warning {{implicit truncation from 'int' to bitfield changes value from 10 to 2}} 38 struct A e = { .foo = 10 }; // expected-warning {{implicit truncation from 'int' to bitfield changes value from 10 to 2}} 39} 40