llvm dev - Oct 2021 - Disabling/Enabling subtarget's feature from clang cmdline

Hello,
I have a set of two subtargets, each of them has a set of given features.
>From "llc" cmdline it is possible to enable/disable given feature
on given
subtarget by adding: -attr=+/-<feature_name>

Is it possible to explicitly disable/enable a given feature from clang
cmdline?
I was trying to do it with "-mllvm -attr=feature_name", but it
didn't work.

Thanks,
Przemek
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It’s usually options like “-m<feature_name>” and
“-mno-<feature_name>”
You can find all usable options here, e.g.:
https://clang.llvm.org/docs/ClangCommandLineReference.html#x86

Thanks
Phoebe (Pengfei)

From: llvm-dev <llvm-dev-bounces at lists.llvm.org> On Behalf Of
Przemyslaw Ossowski via llvm-dev
Sent: Wednesday, October 6, 2021 8:53 PM
To: llvm-dev <llvm-dev at lists.llvm.org>
Subject: [llvm-dev] Disabling/Enabling subtarget's feature from clang
cmdline

Hello,
I have a set of two subtargets, each of them has a set of given features.

From "llc" cmdline it is possible to enable/disable given feature on
given subtarget by adding: -attr=+/-<feature_name>

Is it possible to explicitly disable/enable a given feature from clang cmdline?
I was trying to do it with "-mllvm -attr=feature_name", but it
didn't work.

Thanks,
Przemek
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