[ThinLTO] asserts !(Pair.first != Ty && Pair.second == Ty) && "mapping to a source type" failed #35437
Description
| Bugzilla Link | 36089 |
| Resolution | FIXED |
| Resolved on | Jan 31, 2018 01:03 |
| Version | 6.0 |
| OS | Linux |
| Blocks | #35152 |
| CC | @zmodem,@pogo59,@pcc,@wjristow |
Extended Description
This seems related to llvm/llvm-bugzilla-archive#37522 but wasn't fixed by r322103.
At r323433:
$ clang --version
clang version 7.0.0
Target: x86_64-unknown-linux-gnu
Thread model: posix
...
$ cat a.cpp
void foo() {}
$ cat b.cpp
struct B;
struct C {
C(B &);
};
struct A &fn1() {}
C::C(B &) {}
$ cat c.cpp
struct A &foo();
template <A &() = foo> struct D {};
struct B {
B(A &);
D<> m_list;
};
struct C {
C(B &);
};
void bar() {
B b(foo());
C c(b);
}
$ clang -c -O1 -g -flto=thin a.cpp
$ clang -c -O1 -g -flto=thin b.cpp
b.cpp:5:18: warning: control reaches end of non-void function [-Wreturn-type]
struct A &fn1() {}
^
1 warning generated.
$ clang -c -O1 -g -flto=thin c.cpp
$ llvm-lto -thinlto-action=run a.o b.o c.o
llvm-lto: /home/user/git/llvm/lib/Linker/IRMover.cpp:248: llvm::Type*
{anonymous}::TypeMapTy::get(llvm::Type*, llvm::SmallPtrSet<llvm::StructType*, 8u>&): Assertion
`!(Pair.first != Ty && Pair.second == Ty) && "mapping to a source type"' failed.
...