[commit: ghc] master: Make sure README.md mentions that make can build in parallel. (0b72347)

[Austin Seipp]

Repository : http://darcs.haskell.org/ghc.git/

On branch  : master

https://github.com/ghc/ghc/commit/0b72347dc468ba081d67385a077238bcaa9eb4d5

>---------------------------------------------------------------

commit 0b72347dc468ba081d67385a077238bcaa9eb4d5
Author: Austin Seipp <aseipp at pobox.com>
Date:   Fri Mar 29 14:37:31 2013 -0500

    Make sure README.md mentions that make can build in parallel.
    
    Signed-off-by: Austin Seipp <aseipp at pobox.com>

>---------------------------------------------------------------

 README.md       | 7 ++++++-
 libraries/Cabal | 2 +-
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/README.md b/README.md
index 3b3a66e..87601b3 100644
--- a/README.md
+++ b/README.md
@@ -62,9 +62,14 @@ dblatex.
 
     $ perl boot
     $ ./configure
-    $ make
+    $ make         # can also say 'make -jX' for X number of jobs
     $ make install
 
+(NB: **Do you have multiple cores? Be sure to tell that to `make`!** This can
+save you hours of build time depending on your system configuration, and is
+almost always a win regardless of how many cores you have. As a simple rule,
+you should have about `N`+1 jobs, where `N` is the amount of cores you have.)
+
 The `perl boot` step is only necessary if this is a tree checked out
 from git.  For source distributions downloaded from [GHC's web site] [1],
 this step has already been performed.
diff --git a/libraries/Cabal b/libraries/Cabal
index 14c5a3f..09289c0 160000
--- a/libraries/Cabal
+++ b/libraries/Cabal
@@ -1 +1 @@
-Subproject commit 14c5a3f78c00772cf54c2fd5c920a64d53e6f594
+Subproject commit 09289c0e1f3eb667aa30f6d4189e19186f433119