[task #16114] Print warning where integer overflow happens

[Mohammad Akhlaghi]

Follow-up Comment #13, task #16114 (project gnuastro):

Thanks Siyang.

Now that the building time is done, let's test the effect of the over-flow
check on the run-time of a program. This will help to decide if we want to
have it as the default mode (so no-overflow check should be given an option),
or not.

You can make an arbitrarily large (in this case 10000x10000 pixels) unsigned
8-bit integer image with the command below.


$ astarithmetic 10000 10000 2 makenew 100 u8 + \
                20 mknoise-sigma u8 -onoised.fits


Then try a basic '+' operator on the noised image two times: once when you
build Arithmetic with over-flow check and once without it.  Just make sure to
empty your RAM (as root) before every run (so the loading time is not
included):


$ sudo su
# sync; echo 3 > /proc/sys/vm/drop_caches 




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