1 // RUN: %clang_cc1 -fsyntax-only -Wall -Wunused-macros -Wunused-parameter -Wno-uninitialized -verify %s
2 
3 // rdar://8365684
4 struct S {
5     void m1() { int b; while (b==b); } // expected-warning {{always evaluates to true}}
6 
7 #pragma clang diagnostic push
8 #pragma clang diagnostic ignored "-Wtautological-compare"
9     void m2() { int b; while (b==b); }
10 #pragma clang diagnostic pop
11 
12     void m3() { int b; while (b==b); } // expected-warning {{always evaluates to true}}
13 };
14 
15 //------------------------------------------------------------------------------
16 
17 #pragma clang diagnostic push
18 #pragma clang diagnostic ignored "-Wtautological-compare"
19 template <typename T>
20 struct TS {
21     void m() { T b; while (b==b); }
22 };
23 #pragma clang diagnostic pop
24 
25 void f() {
26     TS<int> ts;
27     ts.m();
28 }
29 
30 //------------------------------------------------------------------------------
31 
32 #define UNUSED_MACRO1 // expected-warning {{macro is not used}}
33 
34 #pragma clang diagnostic push
35 #pragma clang diagnostic ignored "-Wunused-macros"
36 #define UNUSED_MACRO2
37 #pragma clang diagnostic pop
38 
39 //------------------------------------------------------------------------------
40 
41 #pragma clang diagnostic push
42 #pragma clang diagnostic ignored "-Wreturn-type"
43 int g() { }
44 #pragma clang diagnostic pop
45 
46 //------------------------------------------------------------------------------
47 
48 void ww(
49 #pragma clang diagnostic push
50 #pragma clang diagnostic ignored "-Wunused-parameter"
51         int x,
52 #pragma clang diagnostic pop
53         int y) // expected-warning {{unused}}
54 {
55 }
56 
57 //------------------------------------------------------------------------------
58 
59 struct S2 {
60     int x, y;
61     S2() :
62 #pragma clang diagnostic push
63 #pragma clang diagnostic ignored "-Wreorder"
64     y(),
65     x()
66 #pragma clang diagnostic pop
67     {}
68 };
69 
70 //------------------------------------------------------------------------------
71 
72 // rdar://8790245
73 #define MYMACRO \
74     _Pragma("clang diagnostic push") \
75     _Pragma("clang diagnostic ignored \"-Wunknown-pragmas\"") \
76     _Pragma("clang diagnostic pop")
77 MYMACRO
78 #undef MYMACRO
79 
80 //------------------------------------------------------------------------------
81