[LLVMbugs] [Bug 22063] -fsanitize=undefined causes very long compile time

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=22063

Alexey Samsonov <vonosmas at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |vonosmas at gmail.com
         Resolution|---                         |DUPLICATE

--- Comment #3 from Alexey Samsonov <vonosmas at gmail.com> ---
This is most likely caused by the slowdown in register allocation (see
http://llvm.org/bugs/show_bug.cgi?id=21349 and
http://llvm.org/bugs/show_bug.cgi?id=17409).

You can try to build the specific source code file with -fno-sanitize=undefined
to disable UBSan checks in it, or lower optimization level, or add "-mllvm
-regalloc=pbqp" which could work faster.

*** This bug has been marked as a duplicate of bug 21349 ***

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