1// PR c++/34198 2// { dg-do compile } 3// { dg-options "-O2 -Wconversion -Wsign-conversion" } 4 5signed char sc; 6unsigned char uc; 7short int ss; 8unsigned short int us; 9int si; 10unsigned int ui; 11 12void test1 (void) 13{ 14 int a = uc & 0xff; 15 int b = sc & 0x7f; 16 int c = 0xff & uc; 17 int d = 0x7f & sc; 18 int e = uc & sc; 19 unsigned char f = (int) uc; 20 signed char g = (int) sc; 21 unsigned char h = (unsigned int) (short int) uc; 22 signed char i = (int) (unsigned short int) sc; // { dg-warning "may alter its value" } 23 unsigned char j = (unsigned int) (short int) us; // { dg-warning "may alter its value" } 24 signed char k = (int) (unsigned short int) ss; // { dg-warning "may alter its value" } 25} 26 27void test2 (void) 28{ 29 signed char a = (unsigned char) sc; // { dg-warning "may change the sign" } 30 unsigned char b = (signed char) uc; // { dg-warning "may change the sign" } 31 signed char c = (int) (unsigned char) sc; // { dg-warning "may change the sign" } 32 unsigned char d = (int) (signed char) uc; // { dg-warning "may change the sign" } 33 int e = (unsigned int) si; // { dg-warning "may change the sign" } 34 unsigned int f = (int) ui; // { dg-warning "may change the sign" } 35} 36