clang/test/Sema/warn-absolute-value-header.c

   1 // RUN: %clang_cc1 -triple i686-pc-linux-gnu -fsyntax-only -verify %s -Wabsolute-value
   2 // RUN: %clang_cc1 -triple i686-pc-linux-gnu -fsyntax-only %s -Wabsolute-value -fdiagnostics-parseable-fixits 2>&1 | FileCheck %s
   3
   4 int abs(int);
   5
   6 // Wrong signature
   7 int fabsf(int);
   8 // expected-warning@-1{{incompatible redeclaration of library function 'fabsf'}}
   9 // expected-note@-2{{'fabsf' is a builtin with type 'float (float)'}}
  10
  11 void test_int(int i, unsigned u, long long ll, float f, double d) {
  12   (void)abs(i);
  13
  14   // Remove abs call
  15   (void)abs(u);
  16   // expected-warning@-1{{taking the absolute value of unsigned type 'unsigned int' has no effect}}
  17   // expected-note@-2{{remove the call to 'abs' since unsigned values cannot be negative}}
  18   // CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:9-[[@LINE-3]]:12}:""
  19
  20   int llabs;
  21   (void)llabs;
  22   // Conflict in names, no notes
  23   (void)abs(ll);
  24   // expected-warning@-1{{absolute value function 'abs' given an argument of type 'long long' but has parameter of type 'int' which may cause truncation of value}}
  25
  26   // Conflict in names, no notes
  27   (void)abs(f);
  28   // expected-warning@-1{{using integer absolute value function 'abs' when argument is of floating point type}}
  29
  30   // Suggest header.
  31   (void)abs(d);
  32   // expected-warning@-1{{using integer absolute value function 'abs' when argument is of floating point type}}
  33   // expected-note@-2{{use function 'fabs' instead}}
  34   // expected-note@-3{{include the header <math.h> or explicitly provide a declaration for 'fabs'}}
  35   // CHECK: fix-it:"{{.*}}":{[[@LINE-4]]:9-[[@LINE-4]]:12}:"fabs"
  36 }