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

[H.J. Lu]

On Tue, Jun 13, 2017 at 1:21 PM, H.J. Lu <hjl.tools@gmail.com> wrote:
> On Tue, Jun 13, 2017 at 1:13 PM, Florian Weimer <fweimer@redhat.com> wrote:
>> 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.)
>>
>
> LGTM.
>

Here is a patch to backport these 2 patches to 2.25 branch.   Any
comments?

-- 
H.J.
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