clang/test/Sema/format-strings-bitfield-promotion.c

   1 // RUN: %clang_cc1 -triple x86_64-unknown-unknown -fsyntax-only -verify %s
   2 // RUN: %clang_cc1 -triple x86_64-unknown-windows-msvc -fsyntax-only -verify %s
   3
   4 int printf(const char *restrict, ...);
   5
   6 struct bitfields {
   7   long a : 2;
   8   unsigned long b : 2;
   9   long c : 32;          // assumes that int is 32 bits
  10   unsigned long d : 32; // assumes that int is 32 bits
  11 } bf;
  12
  13 void bitfield_promotion(void) {
  14   printf("%ld", bf.a); // expected-warning {{format specifies type 'long' but the argument has type 'int'}}
  15   printf("%lu", bf.b); // expected-warning {{format specifies type 'unsigned long' but the argument has type 'int'}}
  16   printf("%ld", bf.c); // expected-warning {{format specifies type 'long' but the argument has type 'int'}}
  17   printf("%lu", bf.d); // expected-warning {{format specifies type 'unsigned long' but the argument has type 'unsigned int'}}
  18 }