clang/test/Sema/warn-missing-prototypes.c

   1 // RUN: %clang_cc1 -fsyntax-only -Wdocumentation -Wmissing-prototypes -Wno-deprecated-non-prototype -verify %s
   2 // RUN: %clang_cc1 -fsyntax-only -Wdocumentation -Wmissing-prototypes -Wno-deprecated-non-prototype -fdiagnostics-parseable-fixits %s 2>&1 | FileCheck %s
   3
   4 int f(); // expected-note{{this declaration is not a prototype; add parameter declarations to make it one}}
   5 // CHECK-NOT: fix-it:"{{.*}}":{[[@LINE-1]]:{{.*}}-[[@LINE-1]]:{{.*}}}:"{{.*}}"
   6
   7 int f(int x) { return x; } // expected-warning{{no previous prototype for function 'f'}}
   8
   9 static int g(int x) { return x; }
  10
  11 int h(int x) { return x; } // expected-warning{{no previous prototype for function 'h'}}
  12 // expected-note@-1{{declare 'static' if the function is not intended to be used outside of this translation unit}}
  13 // CHECK: fix-it:"{{.*}}":{[[@LINE-2]]:1-[[@LINE-2]]:1}:"static "
  14
  15 static int g2();
  16
  17 int g2(int x) { return x; }
  18
  19 extern int g3(int x) { return x; } // expected-warning{{no previous prototype for function 'g3'}}
  20 // expected-note@-1{{declare 'static' if the function is not intended to be used outside of this translation unit}}
  21 // CHECK-NOT: fix-it:"{{.*}}":{[[@LINE-2]]:{{.*}}-[[@LINE-2]]:{{.*}}}:"{{.*}}"
  22
  23 void test(void);
  24
  25 int h3(); // expected-note{{this declaration is not a prototype; add parameter declarations to make it one}}
  26 // CHECK-NOT: fix-it:"{{.*}}":{[[@LINE-1]]:{{.*}}-[[@LINE-1]]:{{.*}}}:"{{.*}}"
  27 int h4(int);
  28 int h4();
  29
  30 void test(void) {
  31   int h2(int x);
  32   int h3(int x);
  33   int h4();
  34 }
  35
  36 int h2(int x) { return x; } // expected-warning{{no previous prototype for function 'h2'}}
  37 // expected-note@-1{{declare 'static' if the function is not intended to be used outside of this translation unit}}
  38 int h3(int x) { return x; } // expected-warning{{no previous prototype for function 'h3'}}
  39 int h4(int x) { return x; }
  40
  41 int f2(int);
  42 int f2();
  43
  44 int f2(int x) { return x; }
  45
  46 int main(void) { return 0; }
  47
  48 void not_a_prototype_test(); // expected-note{{this declaration is not a prototype; add 'void' to make it a prototype for a zero-parameter function}}
  49 // CHECK: fix-it:"{{.*}}":{[[@LINE-1]]:27-[[@LINE-1]]:27}:"void"
  50 void not_a_prototype_test() { } // expected-warning{{no previous prototype for function 'not_a_prototype_test'}}
  51
  52 const int *get_const() { // expected-warning{{no previous prototype for function 'get_const'}}
  53   // expected-note@-1{{declare 'static' if the function is not intended to be used outside of this translation unit}}
  54   // CHECK: fix-it:"{{.*}}":{[[@LINE-2]]:1-[[@LINE-2]]:1}:"static "
  55   return (void *)0;
  56 }
  57
  58 struct MyStruct {};
  59
  60 const struct MyStruct get_struct() { // expected-warning{{no previous prototype for function 'get_struct'}}
  61   // expected-note@-1{{declare 'static' if the function is not intended to be used outside of this translation unit}}
  62   // CHECK: fix-it:"{{.*}}":{[[@LINE-2]]:1-[[@LINE-2]]:1}:"static "
  63   struct MyStruct ret;
  64   return ret;
  65 }
  66
  67 // Turn off clang-format for white-space dependent testing.
  68 // clang-format off
  69 // Two spaces between cost and struct
  70 const  struct MyStruct get_struct_2() {  // expected-warning{{no previous prototype for function 'get_struct_2'}}
  71   // expected-note@-1{{declare 'static' if the function is not intended to be used outside of this translation unit}}
  72   // CHECK: fix-it:"{{.*}}":{[[@LINE-2]]:1-[[@LINE-2]]:1}:"static "
  73   struct MyStruct ret;
  74   return ret;
  75 }
  76
  77 // Two spaces bewteen const and struct
  78 const  struct MyStruct* get_struct_ptr() {  // expected-warning{{no previous prototype for function 'get_struct_ptr'}}
  79   // expected-note@-1{{declare 'static' if the function is not intended to be used outside of this translation unit}}
  80   // CHECK: fix-it:"{{.*}}":{[[@LINE-2]]:1-[[@LINE-2]]:1}:"static "
  81   return (void*)0;
  82 }
  83
  84 // Random comment before const.
  85 /*some randome comment*/const  struct MyStruct* get_struct_3() {  // expected-warning{{no previous prototype for function 'get_struct_3'}}
  86   // expected-note@-1{{declare 'static' if the function is not intended to be used outside of this translation unit}}
  87   // CHECK: fix-it:"{{.*}}":{[[@LINE-2]]:25-[[@LINE-2]]:25}:"static "
  88   return (void*)0;
  89 }
  90
  91 // Random comment after const.
  92 const/*some randome comment*/ struct MyStruct* get_struct_4() {  // expected-warning{{no previous prototype for function 'get_struct_4'}}
  93   // expected-note@-1{{declare 'static' if the function is not intended to be used outside of this translation unit}}
  94   // CHECK: fix-it:"{{.*}}":{[[@LINE-2]]:1-[[@LINE-2]]:1}:"static "
  95   return (void*)0;
  96 }
  97 // clang-format on
  98
  99 #define MY_CONST const
 100
 101 // Since we can't easily understand what MY_CONST means while preparing the
 102 // diagnostic, the fix-it suggests to add 'static' in a non-idiomatic place.
 103 MY_CONST struct MyStruct *get_struct_nyi() { // expected-warning{{no previous prototype for function 'get_struct_nyi'}}
 104   // expected-note@-1{{declare 'static' if the function is not intended to be used outside of this translation unit}}
 105   // CHECK: fix-it:"{{.*}}":{[[@LINE-2]]:10-[[@LINE-2]]:10}:"static "
 106   return (void *)0;
 107 }