Re: [PATCH v2 3/7] configure: Detect compiler support for __attribute__((alias))

[Alex Bennée]

Richard Henderson <address@hidden> writes:

> Such support is present almost everywhere, except for Xcode 9.
> It is added in Xcode 10, but travis uses xcode9 by default,
> so we should support it for a while yet.

We really should get someone who has an AppleID to check what the
support period is because if Apple don't care about Xcode9 anymore I
doubt we should.

Anyway:

Reviewed-by: Alex Bennée <address@hidden>

>
> Signed-off-by: Richard Henderson <address@hidden>
> ---
>  configure | 19 +++++++++++++++++++
>  1 file changed, 19 insertions(+)
>
> diff --git a/configure b/configure
> index 145fcabbb3..3a9862fe5e 100755
> --- a/configure
> +++ b/configure
> @@ -5518,6 +5518,21 @@ if compile_prog "" "" ; then
>    vector16=yes
>  fi
>
> +########################################
> +# See if __attribute__((alias)) is supported.
> +# This false for Xcode 9, but has been remedied for Xcode 10.
> +# Unfortunately, travis uses Xcode 9 by default.
> +
> +attralias=no
> +cat > $TMPC << EOF
> +int x = 1;
> +extern const int y __attribute__((alias("x")));
> +int main(void) { return 0; }
> +EOF
> +if compile_prog "" "" ; then
> +    attralias=yes
> +fi
> +
>  ########################################
>  # check if getauxval is available.
>
> @@ -7083,6 +7098,10 @@ if test "$vector16" = "yes" ; then
>    echo "CONFIG_VECTOR16=y" >> $config_host_mak
>  fi
>
> +if test "$attralias" = "yes" ; then
> +  echo "CONFIG_ATTRIBUTE_ALIAS=y" >> $config_host_mak
> +fi
> +
>  if test "$getauxval" = "yes" ; then
>    echo "CONFIG_GETAUXVAL=y" >> $config_host_mak
>  fi


--
Alex Bennée