Re: How to cache output of the compiler aka ccache

[Vinzent 'Gadget' Hoefler <nntp-2005-03@t-domaingrabbing.de>]

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". :)

>  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 recompiles out-of-date dependencies, though.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.
But if just *some* .class file somewhere in the middle of the hierarchy
gets changed, it simply failes to detect that change.

That's very different from what an Ada compiler is - by definition -
required to do.


Vinzent.

-- 
worst case: The wrong assumption there actually is one.