[llvm-bugs] [Bug 32158] New: Program crashing due to missing return statement?

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=32158

            Bug ID: 32158
           Summary: Program crashing due to missing return statement?
           Product: new-bugs
           Version: 3.9
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: yaron.keren at gmail.com
                CC: llvm-bugs at lists.llvm.org

$ cat file1.cpp
int backend() {}
int main() { backend(); }

$ clang-3.9 file1.cpp ; ./a.out
file1.cpp:1:16: warning: control reaches end of non-void function
[-Wreturn-type]
int backend() {}
               ^
1 warning generated.
Illegal instruction (core dumped)

$ clang-3.9 -v
clang version 3.9.0 (trunk 274529)


happens with clang version 5.0.0 (trunk 294982) too.
if this is valid (undefined?) behaviour, shouldn't the -Wreturn-type be an
error?

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