https://bugs.llvm.org/show_bug.cgi?id=47556
Bug ID: 47556
Summary: Constructor homing missing anonymous union
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: DebugInfo
Assignee: unassignedb...@nondot.org
Reporter: akhu...@google.com
CC: jdevliegh...@apple.com, keith.wal...@arm.com,
llvm-bugs@lists.llvm.org,
paul_robin...@playstation.sony.com
This was reported internally but I'll upload it here too. Basically with
-debug-info-kind=constructor the type info for the anonymous union is
incomplete.
$ cat t.cc
void *operator new(unsigned long, void *p) { return p; }
struct TestStruct {
int val;
};
struct OptionalStorageBase {
constexpr OptionalStorageBase() : empty_('\0') {}
union {
char empty_;
TestStruct value_;
};
};
int main() {
OptionalStorageBase t_opt;
new (&t_opt.value_) TestStruct(TestStruct{20});
return t_opt.value_.val;
}
$ clang -cc1 -debug-info-kind=constructor -emit-llvm t.cc -o - | grep
"DW_TAG_union_type,"
$ !30 = !DICompositeType(tag: DW_TAG_union_type, scope: !27, file: !5, line:
10, size: 32, flags: DIFlagFwdDecl, identifier:
"_ZTSN19OptionalStorageBaseUt_E")
$
$ clang -cc1 -debug-info-kind=limited -emit-llvm t.cc -o - | grep
"DW_TAG_union_type"
$ !30 = distinct !DICompositeType(tag: DW_TAG_union_type, scope: !27, file: !5,
line: 10, size: 32, flags: DIFlagExportSymbols | DIFlagTypePassByValue,
elements: !31, identifier: "_ZTSN19OptionalStorageBaseUt_E")
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