[llvm-bugs] [Bug 35227] New: [ThinLTO] Core dump - "Expected a single module"

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=35227

            Bug ID: 35227
           Summary: [ThinLTO] Core dump - "Expected a single module"
           Product: new-bugs
           Version: 5.0
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: russell_gallop at sn.scee.net
                CC: llvm-bugs at lists.llvm.org

Tested at master (r317500) and release50 (r316607).
$ cat test.cpp
struct C {
  virtual void m_fn1();
};
struct D : C {
//  void m_fn1();
} a;
$ clang -o test.o -flto-thin -c test.cpp
$ llvm-lto --thinlto-action=run test.o
error: can't create module summary index for buffer: Expected a single module
LLVMSymbolizer: error reading file: No such file or directory
...
Stack dump:
0.      Program arguments: llvm-lto --thinlto-action=run test.cpp.o
Segmentation fault (core dumped)


Note that the following warning is given for this file by -Weverything
$ clang -Weverything -c test.cpp
test.cpp:4:8: warning: 'D' has no out-of-line virtual method definitions; its
vtable will be emitted in every translation unit [-Wweak-vtables]
struct D : C {
       ^
When fixed (uncomment line 5 in test.cpp) the above example builds okay.

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