[llvm-dev] Interaction of --disable-llvm-passes and -O0

[Dan Zimmerman via llvm-dev]

Pardon if this isn't the right forum for this question, but is there a reason that when both `--disable-llvm-passes` and `-O0` are passed to cc1 llvm optimization passes still appear to occur? For the past hour or so I was trying to figure out how to get a proper test for https://reviews.llvm.org/D41050 <https://reviews.llvm.org/D41050> out - as soon as I changed -O0 to -O3 (as suggested in this post: http://lists.llvm.org/pipermail/llvm-dev/2017-April/111989.html <http://lists.llvm.org/pipermail/llvm-dev/2017-April/111989.html>) the optimization passes didn't occur. Is this known/defined behavior? If so, is there documentation as to why it behaves that way?

Dan
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