[PATCH] Make copy of <bits/std_abs.h> from GCC 7 [BZ #21573]

[Florian Weimer]

On 06/13/2017 01:54 PM, H.J. Lu wrote:
> -    echo "#include <$1>" | $CXX -M -MP -x c++ - | sed -n "/$1:/{s/:\$//;p}"
> +    echo "#include <$1>" | $CXX -M -MP -x c++ - | sed -n "\,$1:,{s/:\$//;p}"
>    }
>    CXX_CSTDLIB_HEADER="$(find_cxx_header cstdlib)"
> +  # Also make a copy of <bits/std_abs.h> from GCC 7 to prevent it from
> +  # including /usr/include/stdlib.h.
> +  CXX_CSTDLIB_HEADER="$CXX_CSTDLIB_HEADER $(find_cxx_header bits/std_abs.h)"

I think the attached patch is needed to suppress the error message if
the header does not exist.  (Regenerated configure file not shown in the
patch.)

Thanks,
Florian
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