Tracing where build time is spent

[Caolán McNamara]

On Mon, 2020-02-17 at 11:51 +0100, Luboš Luňák wrote:
> On Sunday 16 of February 2020, Noel Grandin wrote:
> > On Sun, 16 Feb 2020 at 16:33, Luboš Luňák <l.lunak at collabora.com>
> > wrote:
> > > - It takes 3 minutes to unpack the 100MiB bzip2 tarball of boost,
> > > which
> > > unpacks to about 0.5GiB of stuff including generated html docs.
> > > It would be a cheap gain to get rid of all doc/ example/ test/
> > > and repack it as .xz .
> > > 
> > > Or maybe teach the unpacker to skip those?
> 
>  I think you cannot teach unpacker to skip parts of .tar.XYZ , it
> pretty much always has to unpack the whole thing to get the .tar.

could use the upstream zips instead, that would allow selectively
skipping decompression, though the zips are correspondingly larger than
the tar.xz