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From: Ed Maste <emaste@freebsd.org>
Date: Sat, 19 May 2018 07:27:03 -0400
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Subject: Re: svn commit: r333819 - in head/sys: conf modules/blake2
 modules/crypto modules/drm2/i915kms modules/ipfilter
To: Matt Macy <mmacy@freebsd.org>
Cc: src-committers <src-committers@freebsd.org>, svn-src-all@freebsd.org, 
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On 18 May 2018 at 20:04, Matt Macy <mmacy@freebsd.org> wrote:
> Author: mmacy
> Date: Sat May 19 00:04:01 2018
> New Revision: 333819
> URL: https://svnweb.freebsd.org/changeset/base/333819
>
> Log:
>   Silence non-actionable warnings in vendor code
...
> Modified: head/sys/conf/kern.mk
> ==============================================================================
> --- head/sys/conf/kern.mk       Fri May 18 23:42:08 2018        (r333818)
> +++ head/sys/conf/kern.mk       Sat May 19 00:04:01 2018        (r333819)
> @@ -18,12 +18,13 @@ CWARNFLAGS?=        -Wall -Wredundant-decls -Wnested-externs
>  # a false positive.
>  .if ${COMPILER_TYPE} == "clang"
>  NO_WCONSTANT_CONVERSION=       -Wno-error-constant-conversion
> -NO_WSHIFT_COUNT_NEGATIVE=      -Wno-error-shift-count-negative
> -NO_WSHIFT_COUNT_OVERFLOW=      -Wno-error-shift-count-overflow
> -NO_WSELF_ASSIGN=               -Wno-error-self-assign
> +NO_WSHIFT_COUNT_NEGATIVE=      -Wno-shift-count-negative
> +NO_WSHIFT_COUNT_OVERFLOW=      -Wno-shift-count-overflow
> +NO_WSELF_ASSIGN=               -Wno-self-assign

This silences the warning across the tree, not just vendor code.