[dmd-internals] DMD bootstrapping version requirements

[Daniel Murphy via dmd-internals]

That sounds reasonable.  But couldn't the same be achieved by just
fixing the directory layout to match the package layout?  I thought we
were planning that anyway.

On Fri, Feb 17, 2017 at 9:56 PM, Walter Bright <walter at digitalmars.com> wrote:
>
>
> On 2/16/2017 7:43 PM, Daniel Murphy wrote:
>>
>> Why exactly do you need that switch to convert the backend?  As long
>> as the source files are passed on the command line and have a module
>> declaration then they don't care which directory they are in.
>
>
> I want to use separate compilation for the back end, rather than lumping it
> into one big compile. One reason is asserts cannot be turned off for the
> back end. (They are for the front end for compilation speed reasons.)
>
> Incremental compile times become excessive, because everything has to be
> recompiled.
>
> Tracking down a compiler bug can get hard when one cannot use separate
> compilation. It's a bitch tracking them down in Phobos, but at least I can
> cut things down to size with separate compilation. I just did that for
> https://github.com/dlang/dmd/pull/6546, and I'm not so sure I could have
> found it without separate compilation - it certainly would have taken much,
> much longer.