ports/161029: devel/ccache doesn't fully support clang yet

[Volodymyr Kostyrko]

>Number:         161029
>Category:       ports
>Synopsis:       devel/ccache doesn't fully support clang yet
>Confidential:   no
>Severity:       serious
>Priority:       low
>Responsible:    freebsd-ports-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Mon Sep 26 06:20:08 UTC 2011
>Closed-Date:
>Last-Modified:
>Originator:     Volodymyr Kostyrko
>Release:        HEAD
>Organization:
None
>Environment:
FreeBSD vux.3501.lan 9.0-BETA2 FreeBSD 9.0-BETA2 #1: Tue Sep 20 16:07:04 EEST 2011     arcade at vux.3501.lan:/usr/obj/usr/src/sys/MINIMAL  amd64
>Description:
Most details are noted at https://bugzilla.samba.org/show_bug.cgi?id=8460. WIP.

The failing port is graphics/giblib but the damage to the packages might be severe - evrerything that depends on libtool can be corrupted.
>How-To-Repeat:
Rebuild libtool with clang having ccache enabled. Try build any libtool based library and you will get:

clang: warning: argument unused during compilation: '-fpic'
building shared library xxxxxxx.so.x
ld: xxxxxx.So: relocation R_X86_64_32S can not be used when making a shared object; recompile with -fPIC
xxxxxx.So: could not read symbols: Bad value
clang: error: linker command failed with exit code 1 (use -v to see invocation)
>Fix:
Remove clang and clang++ from the compilers leaving a note that they could be readded later. This way the links to clang and clang++ would not be added by default and everything would work fine. Anyone can add clang and clang++ to EXTRA_COMPILERS to make use of ccache.

>Release-Note:
>Audit-Trail:
>Unformatted: