[llvm-bugs] [Bug 29134] New: clang-cl doesn't consider __assume() when emitting [-Wreturn-type] warnings

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=29134

            Bug ID: 29134
           Summary: clang-cl doesn't consider __assume() when emitting
                    [-Wreturn-type] warnings
           Product: clang
           Version: 3.9
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: 6yearold at gmail.com
                CC: dgregor at apple.com, llvm-bugs at lists.llvm.org
    Classification: Unclassified

The code 

int func2(int i) {
    switch(i) {
      case 1:
         return 1;
      case 2:
         return 2;
      default:
         __assume(0);
   }
}

int main(int p)
{
   func2(2);
}

produces this warning:

tst.cpp(11,1):  warning: control may reach end of non-void function
[-Wreturn-type]
}
^

while cl.exe is silent on that.

This is a problem when compiling with -Werror, because this warning gets turned
into a error and this leads to compilation failure.

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