clang/test/Sema/knr-def-call.c

   1 // RUN: %clang_cc1 -triple i386-pc-unknown -Wconversion -Wliteral-conversion -fsyntax-only -verify %s
   2
   3 // C DR #316, PR 3626.
   4 void f0(a, b, c, d) int a,b,c,d; {} // expected-warning {{a function definition without a prototype is deprecated in all versions of C and is not supported in C23}}
   5 void t0(void) {
   6   f0(1);  // expected-warning{{too few arguments}}
   7 }
   8
   9 void f1(a, b) int a, b; {} // expected-warning {{a function definition without a prototype is deprecated in all versions of C and is not supported in C23}}
  10 void t1(void) {
  11   f1(1, 2, 3); // expected-warning{{too many arguments}}
  12 }
  13
  14 void f2(float); // expected-note{{previous declaration is here}}
  15 void f2(x) float x; { } // expected-warning{{promoted type 'double' of K&R function parameter is not compatible with the parameter type 'float' declared in a previous prototype}} \
  16                            expected-warning {{a function definition without a prototype is deprecated in all versions of C and is not supported in C23}}
  17
  18 typedef void (*f3)(void);
  19 f3 t3(int b) { return b? f0 : f1; } // okay
  20
  21 void f4() {
  22     char *rindex();
  23 }
  24
  25 // FIXME: we should diagnose this case, but when merging function declarations,
  26 // we don't diagnose it because the function is a builtin.
  27 char *rindex(s, c)
  28      register char *s, c; // expected-warning{{promoted type 'char *' of K&R function parameter is not compatible with the parameter type 'const char *' declared in a previous prototype}}
  29 {
  30   return 0;
  31 }
  32
  33 // PR8314
  34 void proto(int);
  35 void proto(x) // expected-warning {{a function definition without a prototype is deprecated in all versions of C and is not supported in C23}}
  36      int x;
  37 {
  38 }
  39
  40 void use_proto() {
  41   proto(42.1); // expected-warning{{implicit conversion from 'double' to 'int' changes value from 42.1 to 42}}
  42   (&proto)(42.1); // expected-warning{{implicit conversion from 'double' to 'int' changes value from 42.1 to 42}}
  43 }
  44
  45 // PR31020
  46 void func(short d) __attribute__((cdecl)); // expected-note{{previous declaration is here}}
  47 void __attribute__((cdecl)) func(d) // expected-warning {{a function definition without a prototype is deprecated in all versions of C and is not supported in C23}}
  48   short d; // expected-warning{{promoted type 'int' of K&R function parameter is not compatible with the parameter type 'short' declared in a previous prototype}}
  49 {}