#162 Rounding issue in test/check_parse_latlon.sh on i386

[Paul Gevers]

I recently updated the Debian package of viking to 1.10, thanks for creating it.

I had one issue building it on i386: one of the tests fails on what seems like a rounding issue.

check_success "S034° 12.3456 W003° 45.6789" "-34.20576 -3.76131"

returns

34.20576 -3.76132 != -34.20576 -3.76131

I tweaked the output of test/test_parse_latlon.c a bit to show more digits (20) to inspect what the delta is, which results the following:

on amd64
-34.20575999999999794454 -3.76131499999999974193 != -34.20576 -3.76131
on i386
-34.20575999999999794454 -3.76131500000000018602 != -34.20576 -3.76131

It seems I can work around the issue by using

check_success "S034° 12.3456 W003° 45.6788" "-34.20576 -3.76131"

[Rob Norris]

Ah the joys of floating point representation!

Thanks for raising this issue.
Agreed, tweaking the input value is the best way to resolve this.

I will upload a fix the source repository in due course.

[Rob Norris]

Please see:
https://sourceforge.net/p/viking/code/ci/8946a8f7f1ee31b3b46b1290f3d3129f881fb762/