Re: [gentoo-user] Re: Upgrading gcc: both 4.4 and 4.5 needed?

["Albert W. Hopkins" <marduk@letterboxes.org>]

On Wed, 2011-11-16 at 08:30 -0500, Willie Wong wrote:
> On Wed, Nov 16, 2011 at 03:29:27PM +0700, Pandu Poluan wrote:
> > > what does "graphite" add ?
> > >
> > 
> > It makes gcc-4.5.3 use a newer method to detect parallelism, thus
> > (potentially) makes programs compiled by gcc to have better multithreaded
> > performance.
> 
> Now, why can't the USE descriptions be like the kernel option
> descriptions and have something like what Pandu wrote included? 

$ equery u gcc
[ Legend : U - final flag setting for installation]
[        : I - package is installed with flag     ]
[ Colors : set, unset                             ]
 * Found these USE flags for sys-devel/gcc-4.5.3-r1:
 U I
 - - bootstrap : !!internal use only!! DO NOT SET THIS FLAG YOURSELF!,
used
                 during original system bootstrapping [make stage2]
 - - build     : !!internal use only!! DO NOT SET THIS FLAG YOURSELF!,
used for
                 creating build images and the first half of
bootstrapping
                 [make stage1]
 + + cxx       : Builds support for C++ (bindings, extra libraries, code
                 generation, ...)
 - - doc       : Adds extra documentation (API, Javadoc, etc). It is
                 recommended to enable per package instead of globally
 - - fortran   : Adds support for fortran (formerly f77)
 - - gcj       : Enable building with gcj (The GNU Compiler for the
Javatm
                 Programming Language)
 - - graphite  : Add support for the framework for loop optimizations
based on
                 a polyhedral intermediate representation
 - - gtk       : Adds support for x11-libs/gtk+ (The GIMP Toolkit)
 + + lto       : Add support for link-time optimizations (unsupported,
use at
                 your own risk).
 - - mudflap   : Add support for mudflap, a pointer use checking library
 - - multislot : Allow for SLOTs to include minor version (3.3.4 instead
of
                 just 3.3)
 - - nls       : Adds Native Language Support (using gettext - GNU
locale
                 utilities)
 - - nocxx     : Old flag -- USE=cxx from now on
 - - nopie     : Disable PIE support (NOT FOR GENERAL USE)
 - - nossp     : Disable SSP support (NOT FOR GENERAL USE)
 + + nptl      : Enable support for Native POSIX Threads Library, the
new
                 threading module (requires linux-2.6 or better usually)
 - - objc      : Build support for the Objective C code language
 - - objc++    : Build support for the Objective C++ language
 - - objc-gc   : Build support for the Objective C code language Garbage
                 Collector
 - - openmp    : Build support for the OpenMP (support parallel
computing),
                 requires >=sys-devel/gcc-4.2 built with USE="openmp"
 - - test      : Workaround to pull in packages needed to run with
                 FEATURES=test. Portage-2.1.2 handles this internally,
so don't
                 set it in make.conf/package.use anymore
 - - vanilla   : Do not add extra patches which change default
behaviour; DO
                 NOT USE THIS ON A GLOBAL SCALE as the severity of the
meaning
                 changes drastically