Make dependencies in KStars

[Hy Murveit]

FWIW, I just looked at the time (from timestamps of the binary and various
.o files)
and it looks like compilation took 28 minutes--so, a lot better than ~50
minutes, but still could be a lot faster.

On Fri, May 15, 2020 at 2:48 PM Hy Murveit <murveit at gmail.com> wrote:

> FWIW, I ran git pull this morning, I believe these were the only changes
> since I had previously compiled
>
>
> > git log --name-only
>
> commit 41d8323f85c1c5bce18e56c8850ac028cdca5df2 (*HEAD -> **master*,
> *origin/master*, *origin/HEAD*)
>
> Author: Jasem Mutlaq <mutlaqja at ikarustech.com>
>
> Date:   Fri May 15 15:53:54 2020 +0300
>
>
>     Correct and simplify the meridian flip degree setting between mount
> and ekos
>
>
> kstars/ekos/mount/mount.ui
>
>
> commit 6749f48a4a056387ca0695cb275a6256501f88a7
>
> Author: Jasem Mutlaq <mutlaqja at ikarustech.com>
>
> Date:   Fri May 15 15:31:00 2020 +0300
>
>
>     Use JNow instead of J2000 when measuring the mount HA circle as
> propoer by Chris Rowlands to accurate measure the Polar Alignment Error.
> Requires more testing
>
>
> kstars/ekos/align/align.cpp
>
> kstars/ekos/align/align.h
>
>
> commit a2ced315eb03f951173a40bb40c28827050ad266
>
> Author: Jasem Mutlaq <mutlaqja at ikarustech.com>
>
> Date:   Fri May 15 15:29:59 2020 +0300
>
>
>     Add function to get UTC datetime from DATE-OBS header field
>
>
> kstars/fitsviewer/fitsdata.cpp
>
> kstars/fitsviewer/fitsdata.h
>
>
>
> I ran make -j6 kstars on my RPi, but now with ccache installed.
>
> Here are the stats (I ran cache -z before the compile, so the stats only
> reflect the compile).
>
> > ccache -s
> cache directory                     /home/pi/.ccache
> primary config                      /home/pi/.ccache/ccache.conf
> secondary config      (readonly)    /etc/ccache.conf
> stats updated                       Fri May 15 13:36:11 2020
> stats zeroed                        Fri May 15 13:09:23 2020
> cache hit (direct)                     0
> cache hit (preprocessed)             336
> cache miss                            71
> cache hit rate                     82.56 %
> called for link                        7
> cleanups performed                     0
> files in cache                      1337
> cache size                         715.5 MB
> max cache size                       3.0 GB
>
>
> So, the great news is that ccache did dramatically speed up my compilation.
> (I didn't time it, but cache hit rate was 82.6%). The bad news is that it
> really does seem to
> recompile many things it doesn't need to.
>
> Could mount.ui be the thing that triggered 400 files to be recompiled?
>
> Hy
>
>
> On Thu, May 14, 2020 at 1:45 AM Giles Coochey <giles at coochey.net> wrote:
>
>>
>> On 14/05/2020 04:03, Hy Murveit wrote:
>> > Thanks. Trying ccache. (May also try the cross-compile...).
>> >
>> >
>> CCache will help, if you do get cross-compiling set up then another way
>> to do it is to use distcc, you perform the compilation on the Pi, but it
>> farms out the compile tasks to other hosts, if the compilation fails on
>> remote hosts (eg missing libraries) then it reverts to do that
>> compilation task locally on the Pi. If you have a whole bunch of hosts
>> then you can go as far as doing things like make -j 50 etc... Just
>> something I learnt when building Gentoo on slow machines.
>>
>> --
>> Giles Coochey
>>
>>
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