[CMake] Finding package for 7-zip comprehension

[Michael Powell]

Okay, this seems great for Zip and for 7z. My guess is it is an open
issue for Gzip?

https://cmake.org/Bug/view.php?id=10973 (0010973: Add a cmake -E
command to access gzip/gunzip)

On Tue, Nov 21, 2017 at 10:58 AM, Michael Powell <mwpowellhtx at gmail.com> wrote:
> On Tue, Nov 21, 2017 at 10:54 AM, Michael Powell <mwpowellhtx at gmail.com> wrote:
>> On Tue, Nov 21, 2017 at 10:49 AM, Michael Powell <mwpowellhtx at gmail.com> wrote:
>>> On Tue, Nov 21, 2017 at 10:47 AM, CHEVRIER, Marc <marc.chevrier at sap.com> wrote:
>>>> “cmake –E tar” supports 7-zip format. Use option –format=7zip (see https://cmake.org/cmake/help/v3.9/manual/cmake.1.html).
>>>
>>> Ah! This I did not know. Thanks for pointing that out!
>
> Oh, duh. I get it. CMake has this built in.
>
>> Well, the version of Tar I am working with does not seem to have this
>> feature implemented? I could be wrong, unless it is undocumented.
>>
>> Based on the version (1.29?) adopted in the Git for Windows distribution.
>>
>> C:\Dev\Git\usr\bin\tar.exe --help | C:\Dev\Git\usr\bin\grep.exe zip
>>   -j, --bzip2                filter the archive through bzip2
>>       --lzip                 filter the archive through lzip
>>   -z, --gzip, --gunzip, --ungzip   filter the archive through gzip
>>
>> G:\Source\Boost.Build\Prototype\repos\boost-1.65.1>C:\Dev\Git\usr\bin\tar.exe --
>> help | C:\Dev\Git\usr\bin\grep.exe zip
>>   -j, --bzip2                filter the archive through bzip2
>>       --lzip                 filter the archive through lzip
>>   -z, --gzip, --gunzip, --ungzip   filter the archive through gzip
>>
>> C:\Dev\Git\usr\bin\tar.exe --help | C:\Dev\Git\usr\bin\grep.exe format
>>   -g, --listed-incremental=FILE   handle new GNU-format incremental backup
>>   -G, --incremental          handle old GNU-format incremental backup
>>                              set version of the sparse format to use (implies
>>                              extract information about file permissions
>>  Archive format selection:
>>   -H, --format=FORMAT        create archive of the given format
>>     gnu                      GNU tar 1.13.x format
>>     oldgnu                   GNU format as per tar <= 1.12
>>     pax                      POSIX 1003.1-2001 (pax) format
>>     ustar                    POSIX 1003.1-1988 (ustar) format
>>     v7                       old V7 tar format
>>                              same as --format=v7
>>       --posix                same as --format=posix
>>  File name transformations:
>>  Informative output:
>>                              show file or archive names after transformation
>> --format=gnu -f- -b20 --quoting-style=escape
>>
>>>> On 21/11/2017 16:43, "CMake on behalf of Konstantin Tokarev" <cmake-bounces at cmake.org on behalf of annulen at yandex.ru> wrote:
>>>>
>>>>
>>>>
>>>>     21.11.2017, 18:38, "Michael Powell" <mwpowellhtx at gmail.com>:
>>>>     > Hello,
>>>>     >
>>>>     > Does anyone happen to know, is there 7-zip comprehension in CMake
>>>>     > today? i.e., that something like this could be done:
>>>>     >
>>>>     > include (FindSevenZip.cmake)
>>>>     >
>>>>     > or:
>>>>     >
>>>>     > find_package (SevenZip)
>>>>     >
>>>>     > I've seen mention of it in places, but could not find it formally as
>>>>     > part of CMake itself, it seems.
>>>>     >
>>>>     > I am running the latest stable v3.9, that I know of.
>>>>
>>>>     Not exactly 7-zip, but you can unpack tar.xz files via built-in cmake -E tar command
>>>>
>>>>     >
>>>>     > Thanks!
>>>>     >
>>>>     > Cheers,
>>>>     >
>>>>     > Michael Powell
>>>>     > --
>>>>     >
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>>>>     --
>>>>     Regards,
>>>>     Konstantin
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