[llvm-bugs] [Bug 27526] Wrong optimization of sprintf

via llvm-bugs llvm-bugs at lists.llvm.org
Tue Apr 26 08:30:38 PDT 2016


David Majnemer <david.majnemer at gmail.com> changed:

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

--- Comment #1 from David Majnemer <david.majnemer at gmail.com> ---
GLibc contains the following:
The behavior of this function is undefined if copying takes place between
objects that overlap—for example, if s is also given as an argument to be
printed under control of the ‘%s’ conversion.


The Single Unix Specification Version 4 says the same thing:
If copying takes place between objects that overlap as a result of a call to
sprintf() or snprintf(), the results are undefined.

Therefore, I do not believe that LLVM's behavior is indicative of a bug.

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