clang/test/Sema/enum-sign-conversion.c

   1 // RUN: %clang_cc1 -triple=x86_64-pc-linux-gnu -fsyntax-only -Wsign-conversion -verify=unsigned,both %s
   2 // RUN: %clang_cc1 -triple=x86_64-pc-linux-gnu -fsyntax-only -Wconversion -verify=unsigned,both %s
   3 // RUN: %clang_cc1 -triple=x86_64-pc-win32 -fsyntax-only -verify -Wsign-conversion -verify=win32,both %s
   4
   5 // PR35200
   6 enum X { A,B,C};
   7 int f(enum X x) {
   8   return x; // unsigned-warning {{implicit conversion changes signedness: 'enum X' to 'int'}}
   9 }
  10
  11 enum SE1 { N1 = -1 }; // Always a signed underlying type.
  12 enum E1 { P1 };       // Unsigned underlying type except on Windows.
  13
  14 // ensure no regression with enum to sign (related to enum-enum-conversion.c)
  15 int f1(enum E1 E) {
  16   return E; // unsigned-warning {{implicit conversion changes signedness: 'enum E1' to 'int'}}
  17 }
  18
  19 enum E1 f2(int E) {
  20   return E; // unsigned-warning {{implicit conversion changes signedness: 'int' to 'enum E1'}}
  21 }
  22
  23 int f3(enum SE1 E) {
  24   return E; // shouldn't warn
  25 }
  26
  27 enum SE1 f4(int E) {
  28   return E; // shouldn't warn
  29 }
  30
  31 unsigned f5(enum E1 E) {
  32   return E; // win32-warning {{implicit conversion changes signedness: 'enum E1' to 'unsigned int'}}
  33 }
  34
  35 enum E1 f6(unsigned E) {
  36   return E; // win32-warning {{implicit conversion changes signedness: 'unsigned int' to 'enum E1'}}
  37 }
  38
  39 unsigned f7(enum SE1 E) {
  40   return E; // both-warning {{implicit conversion changes signedness: 'enum SE1' to 'unsigned int'}}
  41 }
  42
  43 enum SE1 f8(unsigned E) {
  44   return E; // both-warning {{implicit conversion changes signedness: 'unsigned int' to 'enum SE1'}}
  45 }