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
