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

   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 // In C++, the bitfield promotion from long to int does not occur, unlike C.
   5 // expected-no-diagnostics
   6
   7 int printf(const char *restrict, ...);
   8
   9 struct bitfields {
  10   long a : 2;
  11   unsigned long b : 2;
  12   long c : 32;          // assumes that int is 32 bits
  13   unsigned long d : 32; // assumes that int is 32 bits
  14 } bf;
  15
  16 void bitfield_promotion() {
  17   printf("%ld", bf.a);
  18   printf("%lu", bf.b);
  19   printf("%ld", bf.c);
  20   printf("%lu", bf.d);
  21 }