pkg/47295: Add ccache support to pkg_comp

[jmmv%netbsd.org@localhost]

>Number:         47295
>Category:       pkg
>Synopsis:       Add ccache support to pkg_comp
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    pkg-manager
>State:          open
>Class:          change-request
>Submitter-Id:   net
>Arrival-Date:   Fri Dec 07 16:30:01 +0000 2012
>Originator:     Julio Merino
>Release:        NetBSD 5.1_STABLE
>Organization:
Julio Merino
>Environment:
        
        
System: NetBSD homeworld.netbsd.org 5.1_STABLE NetBSD 5.1_STABLE (NBMAIL) #2: 
Mon Jun 11 07:45:45 UTC 2012 
root%franklin.NetBSD.org@localhost:/home/netbsd/5/amd64/kern-compile/NBMAIL 
amd64
Architecture: x86_64
Machine: amd64
>Description:
        It would be nice if pkg_comp had a simple mechanism to enable builds
        with ccache.  The key point here is to store the cache *outside* of
        the chroot so that it survives rebuilds of the compilation environment.

        The goal of this change is to make frequent "pkg_comp auto" calls
        faster, particularly on older platforms.
>How-To-Repeat:
        
>Fix:
        

>Unformatted: