[cfe-dev] Behavior of -mcpu

[Craig Topper via cfe-dev]

Which triple are you targeting. Whether or not -mcpu does anything is
specific to that.

~Craig


On Thu, Feb 28, 2019 at 10:17 AM David Greene via cfe-dev <
cfe-dev at lists.llvm.org> wrote:

> When I pass -mcpu=<something> to clang, I get this:
>
> clang-9: warning: argument unused during compilation: '-mcpu=<something>'
> [-Wunused-command-line-argume nt]
>
> Worse, I do not get code generated for <something> but rather (I think)
> for whatever the host architecture is.
>
> Is this expected behavior?  I know I can use -mtune and -march to
> control things but I expected -mcpu to behave like it does in gcc, where
> it implies -mtune and -march.  I certainly did not expect it to be
> completely ignored.
>
> Thanks for any help!
>
>                             -David
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