Re: [PATCH] configure: Disable -Wtautological-type-limit-compare

[Thomas Huth <thuth@redhat.com>]

On 04/06/2020 05.45, Richard Henderson wrote:
> Clang 10 enables this by default with -Wtype-limit.
> 
> All of the instances flagged by this Werror so far have been
> cases in which we really do want the compiler to optimize away
> the test completely.  Disabling the warning will avoid having
> to add ifdefs to work around this.
> 
> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
> ---
>  configure | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/configure b/configure
> index f087d2bcd1..693f01327f 100755
> --- a/configure
> +++ b/configure
> @@ -2009,6 +2009,8 @@ gcc_flags="-Wno-missing-include-dirs -Wempty-body -Wnested-externs $gcc_flags"
>  gcc_flags="-Wendif-labels -Wno-shift-negative-value $gcc_flags"
>  gcc_flags="-Wno-initializer-overrides -Wexpansion-to-defined $gcc_flags"
>  gcc_flags="-Wno-string-plus-int -Wno-typedef-redefinition $gcc_flags"
> +gcc_flags="$gcc_flags -Wno-tautological-type-limit-compare"
> +
>  # Note that we do not add -Werror to gcc_flags here, because that would
>  # enable it for all configure tests. If a configure test failed due
>  # to -Werror this would just silently disable some features,

Acked-by: Thomas Huth <thuth@redhat.com>