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      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