Replaced ENV.gcc_4_2 + comments with calls to "fails_with_llvm",
to specifically message to the user when a formula is known or suspected
to not build with LLVM. If the user specifies "--use-llvm", the message
will be displayed, but compilation will be tried anyway.
Since using LLVM is now an advanced/hidden feature instead of the
default on 10.6, we'll let the user try anyway (and submit patches
if things are now working.)
brewkit.rb changes ENV destructively, so lets not do that everytime a formula
is required. Now it's possible for other tools to require a formula
description without worrying about side-effects.
pv - Pipe Viewer - is a terminal-based tool for monitoring the
progress of data through a pipeline. It can be inserted into any
normal pipeline between two processes to give a visual indication of
how quickly data is passing through, how long it has taken, how near
to completion it is, and an estimate of how long it will be until
completion.
Signed-off-by: Max Howell <max@methylblue.com>
