getting to know dmd and druntime

[Sean Kelly]

On Jul 23, 2012, at 11:39 AM, maarten van damme wrote:

> 2012/7/23 Sean Kelly <sean at invisibleduck.org>:
>> On Jul 23, 2012, at 3:53 AM, maarten van damme wrote:
>> 
>>> Got some more information here : http://wiki.osdev.org/D_Bare_Bones
>>> 
>>> Any way to do this with dmd? When compiling with -debuglib=none and
>>> -defaultlib=none I still get a 31 kb executable so druntime still gets
>>> linked in.
>> 
>> That's not druntime.  The smallest an executable has ever been with runtime is ~60 kb, and it's larger than that now.
> 
> doesn't druntime get linked in automatically when compiling any D
> file? But your right, when I compile a normal empty d file with only a
> main method the resulting executable is way bigger.

DMD automatically links in libphobos (which contains druntime), but the -defaultlib and -debuglib flags override that.  For example, the druntime unit tests use -defaultlib=druntime -debuglib=druntime to explicitly link in druntime and thus avoid getting phobos as well.