[llvm-bugs] [Bug 36181] New: Microsoft mangling cannot mangle injected class name type

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=36181

            Bug ID: 36181
           Summary: Microsoft mangling cannot mangle injected class name
                    type
           Product: clang
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: smeenai at fb.com
                CC: compnerd at compnerd.org, david.majnemer at gmail.com,
                    dgregor at apple.com, llvm-bugs at lists.llvm.org,
                    rnk at google.com

Using the reduced test case from https://bugs.llvm.org/show_bug.cgi?id=16887 (I
independently arrived at an almost equivalent reduced test case before finding
that one, sigh):

% cat reduced.h
template <typename T> struct A {
  friend void f(A<T>) {}
};
void g() { f(A<int>()); }

% touch empty.cpp
% clang -cc1 -triple x86_64-windows-msvc -emit-pch -o reduced.h.pch -x
c++-header reduced.h
% clang -cc1 -triple x86_64-windows-msvc -emit-llvm -include-pch reduced.h.pch
empty.cpp
Cannot mangle injected class name type.
UNREACHABLE executed

https://reviews.llvm.org/rL188536 changed this from an error to an unreachable.
It should indeed be unreachable for -fdelayed-template-parsing (and running
both of the above clang invocations with -fdelayed-template-parsing doesn't
crash), but it is reachable otherwise.

This is the same underlying issue as
https://bugs.llvm.org/show_bug.cgi?id=35473 and
https://bugs.llvm.org/show_bug.cgi?id=35939. I'm reporting this separately
because this is triggered with a precompiled header vs. modules, and there's a
reduced standalone test case.

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