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1Test binaries created with the following commands:2 3$ cat container.cpp4#include "container.h"5#include <stdlib.h>6 7struct Container_ivars {8 // real definition here9};10 11ContainerPtr allocateContainer() {12 Container *c = (Container *)malloc(sizeof(Container));13 c->ivars = (Container_ivars *)malloc(sizeof(Container_ivars));14 return c;15}16 17extern void doSomething(ContainerPtr);18 19int main() {20 ContainerPtr c = allocateContainer();21 doSomething(c);22 return 0;23}24 25$ cat container.h26struct Container_ivars;27 28struct Container {29 union {30 struct Container_ivars *ivars;31 };32};33 34typedef Container *ContainerPtr;35 36$ cat use.cpp37#include "container.h"38 39void doSomething(ContainerPtr c) {}40 41 42$ clang++ -O0 -g container.cpp -c -o container.o43$ clang++ -O0 -g use.cpp -c -o use.o44$ clang++ use.o container.o -o a.out45 46Note that the link order in the last command matters for this test.47 48RUN: dsymutil -oso-prepend-path %p/../Inputs %p/../Inputs/private/tmp/union/a.out -o %t.dSYM49RUN: llvm-dwarfdump %t.dSYM | FileCheck %s50 51CHECK: DW_TAG_compile_unit52 53CHECK: DW_AT_name ("Container_ivars")54CHECK-NEXT: DW_AT_declaration (true)55 56CHECK: DW_TAG_compile_unit57 58CHECK: DW_AT_name ("Container_ivars")59CHECK-NEXT: DW_AT_byte_size (0x01)60CHECK-NEXT: DW_AT_decl_file ("{{.*}}container.cpp")61CHECK-NEXT: DW_AT_decl_line (4)62