[CMake] Finding package for 7-zip comprehension

[Michael Powell]

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!

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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