[PATCH] configure: fix mktemp call for macOS

[Tomi Ollila]

On Fri, Jun 14 2019, Tomi Ollila wrote:

> On Fri, Jun 14 2019, Ralph Seichter wrote:
>
>> * David Bremner:
>>
>>> TEMP_GPG=$(mktemp -d "${TMPDIR:-/tmp}/notmuch.XXXXXX")
>>>
>>> (borrowed from test/test-lib.sh). This avoids hardcoding the temporary
>>> directory.
>>
>> I had the same thought at first, but I want to ensure that the path
>> length does not cause trouble anymore.
>
> Yes. $TMPDIR could be problematic if it makes the full (unix domain
> socket?) path be too long.
>
> SO, exact version Ralph made looks good to me.


Revert that. mktemp(1) uses $TMPDIR if defined (and just tested)

>
> Tomi
>
>
>>
>>   > uname -v
>>   Darwin Kernel Version 18.6.0: Thu Apr 25 23:16:27 PDT 2019; root:xnu-4903.261.4~2/RELEASE_X86_64
>>   > echo $TMPDIR
>>   /var/folders/m_/w5lk3r_1495dhnl4l0s96pr00000gn/T/
>>
>> That's my MacBook Pro with macOS 10.14.5 (Mojave). AFAIK, older versions
>> can have longer names. Also, I am concerned with accumulating clutter.
>>
>>   > grep clean_tmps_dirs /etc/defaults/periodic.conf
>>   daily_clean_tmps_dirs="/tmp"
>>
>> The /tmp directory will, with default settings, be cleaned periodically
>> by the OS, while $TMPDIR (which is user-specific) will not.
>>
>> -Ralph
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