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Date:   Thu, 9 May 2019 10:01:21 -0700
From:   Nick Desaulniers <>
To:     Sedat Dilek <>
Cc:     Nathan Chancellor <>,
        Masahiro Yamada <>,
        Michal Marek <>,
        Linux Kbuild mailing list <>,
        LKML <>,
        Clang-Built-Linux ML <>,
        Arnd Bergmann <>,
        Alexander Potapenko <>
Subject: Re: [PATCH] Makefile: Don't try to add '-fcatch-undefined-behavior' flag

> On Thu, May 9, 2019 at 1:49 PM Nathan Chancellor
> <> wrote:
> >
> > This is no longer a valid option in clang, it was removed in 3.5, which
> > we don't support.
> >
> >

lol, good catch.
Reviewed-by: Nick Desaulniers <>

> >
> Cool.
> Can you test with -mglobal-merge (inverted -mno-global-merge) which is
> default for Clang?

Looks like these were added in r234668 in 2015, which would've been
Clang 3.6.2, according to:

I'd be fine with dropping the option check there.

There's a few here (-Qunused-arguments) that don't need cc-option
checks.  I recommend someone audit all of them, rather than send a
bunch of little patches.
~Nick Desaulniers

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