sign-compare-enum.c
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// RUN: %clang_cc1 -triple=x86_64-pc-linux-gnu -fsyntax-only -verify -Wsign-compare %s
// RUN: %clang_cc1 -triple=x86_64-pc-win32 -fsyntax-only -verify -Wsign-compare %s
// RUN: %clang_cc1 -x c++ -triple=x86_64-pc-linux-gnu -fsyntax-only -verify -Wsign-compare %s
// RUN: %clang_cc1 -x c++ -triple=x86_64-pc-win32 -fsyntax-only -verify -Wsign-compare %s
// Check that -Wsign-compare is off by default.
// RUN: %clang_cc1 -triple=x86_64-pc-linux-gnu -fsyntax-only -verify -DSILENCE %s
#ifdef SILENCE
// expected-no-diagnostics
#endif
enum PosEnum {
A_a = 0,
A_b = 1,
A_c = 10
};
static const int message[] = {0, 1};
int test_pos(enum PosEnum a) {
if (a < 2)
return 0;
// No warning, except in Windows C mode, where PosEnum is 'int' and it can
// take on any value according to the C standard.
#if !defined(SILENCE) && defined(_WIN32) && !defined(__cplusplus)
// expected-warning@+2 {{comparison of integers of different signs}}
#endif
if (a < 2U)
return 0;
unsigned uv = 2;
#if !defined(SILENCE) && defined(_WIN32) && !defined(__cplusplus)
// expected-warning@+2 {{comparison of integers of different signs}}
#endif
if (a < uv)
return 1;
#if !defined(SILENCE) && defined(_WIN32) && !defined(__cplusplus)
// expected-warning@+2 {{comparison of integers of different signs}}
#endif
if (a < sizeof(message)/sizeof(message[0]))
return 0;
return 4;
}
enum NegEnum {
NE_a = -1,
NE_b = 0,
NE_c = 10
};
int test_neg(enum NegEnum a) {
if (a < 2)
return 0;
#ifndef SILENCE
// expected-warning@+2 {{comparison of integers of different signs}}
#endif
if (a < 2U)
return 0;
unsigned uv = 2;
#ifndef SILENCE
// expected-warning@+2 {{comparison of integers of different signs}}
#endif
if (a < uv)
return 1;
#ifndef SILENCE
// expected-warning@+2 {{comparison of integers of different signs}}
#endif
if (a < sizeof(message)/sizeof(message[0]))
return 0;
return 4;
}