building with ccache w/gcc4.8

[Richard PALO <richard.palo%free.fr@localhost>]

Trying desparately to reduce iterative build times with some behemoths 
like webkit that kill my poor little quadcore, so I package-installed 
ccache (3.1.9).

I've never used ccache before so please be kind.

I added/modified the following to my mk.conf:

PKGSRC_COMPILER= ccache gcc
CCACHE_DIR=     ${WRKOBJDIR}/.ccache

where WRKOBJDIR=/var/tmp/pkgsrc

This all on sunos 5.11 with ABI=64 and gcc 4.8.1 installed.

perhaps I'm missing something, but it appears to me that ccache is not 
operating correctly...

The following is after 40 minutes of build.
> richard@devzoneX:~$ CCACHE_DIR=/var/tmp/pkgsrc/.ccache/ ccache -s
> cache directory                     /var/tmp/pkgsrc/.ccache/
> cache hit (direct)                     0
> cache hit (preprocessed)               0
> cache miss                             0
> called for link                      176
> called for preprocessing            2482
> unsupported source language         1373
> autoconf compile/link                  2
> no input file                          7
> files in cache                         0
> cache size                             0 Kbytes
> max cache size                       8.0 Gbytes

not a single file gets put into the cache.

following the hints of some much earlier posts, I set logging on and 
here a typical extract:
> [2013-08-13T18:20:27.910665 9563 ] === CCACHE STARTED 
> =========================================
> [2013-08-13T18:20:27.911314 9563 ] Command line: 
> /var/tmp/pkgsrc/www/webkit-gtk3/work/.ccache/bin/gcc -c -O2 
> -I/var/tmp/pkgsrc/www/webkit-gtk3/work/.buildlink/include
>  -I/var/tmp/pkgsrc/www/webkit-gtk3/work/.buildlink/include/gettext 
> -I/var/tmp/pkgsrc/www/webkit-gtk3/work/.buildlink/include/freetype2 
> -I/var/tmp/pkgsrc/www/webkit-gt
> k3/work/.buildlink/include/libdrm -DUSE_SYSTEM_MALLOC conftest.c -specs 
> /var/tmp/pkgsrc/www/webkit-gtk3/work/.wrapper/specs.libgcc -m64 
> -L/var/tmp/pkgsrc/www/webkit-g
> tk3/work/.buildlink/lib
> [2013-08-13T18:20:27.911363 9563 ] Hostname: devzoneX
> [2013-08-13T18:20:27.911385 9563 ] Working directory: (null)
> [2013-08-13T18:20:27.911465 9563 ] Unsupported source extension: 
> /var/tmp/pkgsrc/www/webkit-gtk3/work/.wrapper/specs.libgcc
> [2013-08-13T18:20:27.911487 9563 ] Failed; falling back to running the real 
> compiler
> [2013-08-13T18:20:27.911501 9563 ] Executing 
> /var/tmp/pkgsrc/www/webkit-gtk3/work/.gcc/bin/gcc -c -O2 
> -I/var/tmp/pkgsrc/www/webkit-gtk3/work/.buildlink/include -I/var
> /tmp/pkgsrc/www/webkit-gtk3/work/.buildlink/include/gettext 
> -I/var/tmp/pkgsrc/www/webkit-gtk3/work/.buildlink/include/freetype2 
> -I/var/tmp/pkgsrc/www/webkit-gtk3/work
> /.buildlink/include/libdrm -DUSE_SYSTEM_MALLOC conftest.c -specs 
> /var/tmp/pkgsrc/www/webkit-gtk3/work/.wrapper/specs.libgcc -m64 
> -L/var/tmp/pkgsrc/www/webkit-gtk3/wor
> k/.buildlink/lib
> [2013-08-13T18:20:27.911635 9563 ] Acquired lock 
> /var/tmp/pkgsrc/.ccache/b/stats.lock
> [2013-08-13T18:20:27.911877 9563 ] Releasing lock 
> /var/tmp/pkgsrc/.ccache/b/stats.lock
> [2013-08-13T18:20:27.911894 9563 ] Unlink /var/tmp/pkgsrc/.ccache/b/stats.lock 
> (as-tmp)
> [2013-08-13T18:20:27.911957 9563 ] Result: unsupported source language

looking at the wrapper:
> richard@devzoneX:~$ cat 
> /var/tmp/pkgsrc/www/webkit-gtk3/work/.wrapper/specs.libgcc
> *link_libgcc:
> %D -R/opt/pkg/gcc48/x86_64-sun-solaris2.11/lib/%M

Setting CCACHE_CPP2=yes seems to do nothing even though the problem 
appears to be related to the "extension".

BTW, just to make sure I tested some simple gcc builds outside of pkgsrc 
and those seem to work fine (using default patch for CCACHE_DIR in $HOME).

Is anybody using ccache successfully?  any hints would be more than welcome.

cheers