https://bugs.llvm.org/show_bug.cgi?id=36089
Bug ID: 36089
Summary: [ThinLTO] asserts `!(Pair.first != Ty && Pair.second
== Ty) && "mapping to a source type"` failed
Product: libraries
Version: 6.0
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Linker
Assignee: unassignedb...@nondot.org
Reporter: russell_gal...@sn.scee.net
CC: llvm-bugs@lists.llvm.org
This seems related to PR37522 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.
...
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