Floating point minimum values are positive?

[Ali Çehreli]

On 07/22/2013 03:53 PM, bearophile wrote:

 > Ali Çehreli:
 >
 >> Going off topic, why not -w then? If I want to be warned about
 >> something, I don't want the program to be compiled anyway but perhaps
 >> others want to look at warning messages. :)
 >
 > There are discussions like this:
 > http://d.puremagic.com/issues/show_bug.cgi?id=10147
 >
 > Bye,
 > bearophile

This is what I understand from that discussion:

1) There shouldn't be warnings at all; what we call warnings should be 
errors.

I agree with that completely.

2) -w changes the compilation semantics because it may change the result 
of __traits(compiles).

I don't understand that at all because anything that affects the 
compilation environment can change the behavior of __traits(compiles). 
(e.g. the string imports.)

Getting back to -w vs. -wi, I don't understand why to favor -wi over -w. 
This is what the documentation says:

-w
     enable warnings

-wi
     enable informational warnings (i.e. compilation still proceeds 
normally)

   http://dlang.org/dmd-linux.html

First of all, -w does not only enable warnings, it actually makes them 
errors. Great! So, everybody should use -w...

Second, following from that bug report, -wi is useless because it just 
gives informational warnings... and then compilation proceeds normally? 
It is kind of entertaining I guess but it is completely useless from 
program development point of view.

My conclusion: As long as -w exists, keep that on the compilation 
command line and ignore -wi.

I would like to hear others' point of view. I am curious how -wi is 
preferred over -w by others.

Ali