Why C++ compiles slowly

[Steven Schveighoffer]

On Mon, 23 Aug 2010 13:41:07 -0400, Walter Bright  
<newshound2 at digitalmars.com> wrote:

> Steven Schveighoffer wrote:
>> I get a long list of functions proceeding at a reasonable rate.  I've  
>> done that in the past, I feel it's some sort of inner loop problem.   
>> Essentially, something takes way longer to compile than it should, but  
>> way longer on the order of .05 seconds instead of .005 seconds, so you  
>> don't notice it normally.  But somehow my library is able to harness  
>> that deficiency and multiply by 1000.
>>  I don't know, it doesn't seem like dcollections should evoke such a  
>> long compile time.
>
> with or without -O ?

The compile line is:

dmd -unittest unit_test.d dcollections/*.d dcollections/model/*.d

Where unit_test.d is a dummy main.

-Steve