Re: How to cache output of the compiler aka ccache

[Florian Weimer <fw@deneb.enyo.de>]

* Vinzent Hoefler:

> Florian Weimer wrote:
>
>> * Vinzent Hoefler:
>> 
>>> It obviously fails to recompile missing dependencies. From my tests
>>> it also seems to ignore file dates. So I'd say, the "Java Build
>>> System" is non-existent.
>> 
>> It's not specified by the standard.
>
> That's as good as "non-existent". :)

Uh-oh, even with Ada, this is mostly a quality-of-implementation
issue.  Ada implementations only need to enforce consistency.  There's
no need to support build tools which recognize dependencies and
automatically recompile them.  It's also perfectly acceptable to
always recompile all dependencies.

>>  Sun's implementation optionally
>> recompiles out-of-date dependencies, though.
>
> Well, yes. I've tested some more, and from those tests it seems, Sun's
> "javac" recompiles dependencies if they are at most one level deep (or
> - to put it another way - direct dependencies of the file being
> compiled). It even does that recursively, so if I delete /all/ .class
> files it recompiles everything, of course.

Oh, come on, have a closer look at the documentation.