clang/test/CodeGenCXX/warn-padded-bitfields.cpp

   1 // RUN: %clang_cc1 -triple=x86_64-none-none -Wpadded-bitfield -verify=expected %s -emit-llvm-only
   2
   3 struct S1 {
   4   unsigned a : 1;
   5   unsigned long long : 0; // expected-warning {{padding struct 'S1' with 63 bits to align anonymous bit-field}}
   6 };
   7
   8 struct S2 {
   9   unsigned a : 1;
  10   unsigned long long b : 64; // expected-warning {{padding struct 'S2' with 63 bits to align 'b'}}
  11 };
  12
  13 struct S3 {
  14   char a : 1;
  15   short b : 16; // expected-warning {{padding struct 'S3' with 15 bits to align 'b'}}
  16 };
  17
  18 struct [[gnu::packed]] S4 {
  19   char a : 1;
  20   short b : 16;
  21 };
  22
  23 struct S5 {
  24   unsigned a : 1;
  25   unsigned long long b : 63;
  26 };
  27
  28 struct S6 {
  29   unsigned a : 1;
  30   unsigned long long b;
  31 };
  32
  33 struct S7 {
  34   int word;
  35   struct {
  36     int filler __attribute__ ((aligned (8)));
  37   };
  38 };
  39
  40 // The warnings are emitted when the layout of the structs is computed, so we have to use them.
  41 void f(S1, S2, S3, S4, S5, S6, S7){}