[LLVMbugs] [Bug 9395] open source project ITK, when built with clang, has many failing unit tests

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Mon Dec 5 13:48:18 PST 2011


John McCall <rjmccall at apple.com> changed:

           What    |Removed                     |Added
             Status|NEW                         |RESOLVED
         Resolution|                            |INVALID

--- Comment #16 from John McCall <rjmccall at apple.com> 2011-12-05 15:48:18 CST ---
The specified behavior of 'noreturn' is that the function is not allowed to
return.  The GCC manual is quite explicit about this, saying that the compiler
and optimizer can freely assume that the function does not return, etc.  This
is exactly what Clang is doing.  That you've found an example where GCC happens
to not produce code that crashes when you violate the rules does not mean that
your code is sound;  it's more akin to writing past the end of a local
variable, which is a bug that may or may not be exposed depending on a lot of
contextual and internal details that vary from compiler to compiler (and
version to version).  And much like that example, the right thing to do here is
to fix your code, in this case by removing 'noreturn' from the overridden

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