On 24 Nov 2012 00:33, "nettxzl" <nett...@gmail.com> wrote: > > (Sorry if this comes through twice. My first attempt seems to have vanished.) > > Hi, > > I was starting the gcc-4.7.1 (Pass 1) build in Chap. 5 and I was > trying to unpack the files compressed with xz following the command > given there: > > tar -Jxf ../mpfr-3.1.1.tar.xz > > but I got this error message: > > tar: invalid option -- J > > I guessed my host system tar is too old, but it is tar-1.19 and this > is newer than the minimum version, tar-1.18, stated in the host system > requirements. > It's not a problem because I can unpack the files in two steps: first > with xz, then with tar. > > But I think you may want to update the tar version in the host system > requirements. > > I checked the tar release info at http://www.gnu.org/software/tar/#releases > > -J was only introduced as a new short option in tar-1.21 as an alias for --lzma. > > And in tar-1.22, the --xz option was introduced to support xz > compression, while the short option -J was reassigned as a shortcut > for --xz. >
I'm not sure when, but at some point tar automagically figures out which compression is used so I never use opts for unarchiving, just tar xf or vxf if I fancy some speed reading challenge. -- Firerat
-- http://linuxfromscratch.org/mailman/listinfo/lfs-support FAQ: http://www.linuxfromscratch.org/lfs/faq.html Unsubscribe: See the above information page
