Make dependencies in KStars

[Hy Murveit]

Thanks. Trying ccache. (May also try the cross-compile...).

This is how I tried to set it up:

sudo apt-get install ccache

and put this at the end of my ~/.bashrc (perhaps not necessary for kstars?)

export PATH=/usr/lib/ccache:$PATH


Then ran cmake on kstars with the following command:

cmake -DCMAKE_INSTALL_PREFIX=/usr -DCMAKE_BUILD_TYPE=RelWithDebInfo
-DCCACHE_SUPPORT=ON ~/AstroRoot/kstars

and finally

make -j6 kstars


I let it run for a while and got:

> ccache -s
cache directory                     /home/pi/.ccache
primary config                      /home/pi/.ccache/ccache.conf
secondary config      (readonly)    /etc/ccache.conf
stats updated                       Wed May 13 19:54:18 2020
cache hit (direct)                     1
cache hit (preprocessed)               0
cache miss                            62
cache hit rate                      1.59 %
called for link                        8
cleanups performed                     0
files in cache                       131
cache size                          65.4 MB
max cache size                       5.0 GB


then I ran 'make clean' and restarted 'make -j6 kstars' waited a little bit
and got:

> ccache -s
cache directory                     /home/pi/.ccache
primary config                      /home/pi/.ccache/ccache.conf
secondary config      (readonly)    /etc/ccache.conf
stats updated                       Wed May 13 19:57:17 2020
cache hit (direct)                    58
cache hit (preprocessed)               0
cache miss                            62
cache hit rate                     48.33 %
called for link                       12
cleanups performed                     0
files in cache                       131
cache size                          65.4 MB
max cache size                       5.0 GB


so seems to be working.

Hy


On Wed, May 13, 2020 at 2:51 AM Jasem Mutlaq <mutlaqja at ikarustech.com>
wrote:

> Try to install ccache and enable it in CMake, it helps reduce
> compilation times.
>
> --
> Best Regards,
> Jasem Mutlaq
>
>
>
> On Wed, May 13, 2020 at 5:56 AM Hy Murveit <murveit at gmail.com> wrote:
>
>> *TL;DR* KStars makefiles seem to recompile everything (or a lot anyway)
>> when seemingly small 'git pulls' come in. Wondering if there's something
>> wrong with the setup. I'm not a cmake wizard.
>>
>> *Background:* I compile/test KStars mostly on my MacbookPro, and I find
>> the compile times very reasonable there. However, when I am ready to test
>> something with a telescope, I compile and run on my 4Gb RPi4. There it
>> takes about 40 minutes for me to completely build the system (I run 'make
>> -j6 kstars' and am compiling RelWithDebInfo) and for some reason, it often
>> seems to build most of the system.
>>
>> *Gripe: *When I change a single .cpp in an Ekos module, yes, it seems to
>> work fine, just recompile that file, then build the library, then build the
>> binary. However, often I seem relatively small updates come in, and I
>> notice very long compiles.  Do others notice this? I wish I could give
>> concrete examples. Does anyone know how to analyze? E.g. is there a command
>> to see what would be compiled (and why) before running the make? Is there a
>> way to improve this?
>>
>> Thanks,
>> Hy
>>
>>
>>
>>
>>
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