clang/test/CodeGen/flexible-array-init.cpp

   1 // RUN: %clang_cc1 -triple i386-unknown-unknown -x c++ -emit-llvm -o - %s | FileCheck %s
   2
   3 union _u { char a[]; } u = {};
   4 union _u0 { char a[]; } u0 = {0};
   5
   6 // CHECK: %union._u = type { [0 x i8] }
   7
   8 // CHECK: @u = global %union._u zeroinitializer, align 1
   9 // CHECK: @u0 = global { [1 x i8] } zeroinitializer, align 1
  10
  11 union { char a[]; } z = {};
  12 // CHECK: @z = internal global %union.{{.*}} zeroinitializer, align 1
  13 union { char a[]; } z0 = {0};
  14 // CHECK: @z0 = internal global { [1 x i8] } zeroinitializer, align 1
  15
  16 /* C++ requires global anonymous unions have static storage, so we have to
  17    reference them to keep them in the IR output. */
  18 char keep(int pick)
  19 {
  20         if (pick)
  21                 return z.a[0];
  22         else
  23                 return z0.a[0];
  24 }