[ghc] Upgrade to 7.0.3 !!

upgrade my ghc into 7.0.3 via homebrew.

1. updating homebrew
> brew update

2. upgrade all package you installed
> brew upgrade
or, install lastest ghc only
> brew install ghc
> brew cleanup ghc

3.
kill cabal .. XD
> cd ~/.cabal
> rm -R *
> cd ~/.ghc
> rm -R <path>
path is, for example, i386-darwin-7.0.3

restart cabal by
> cabal update

now, you could install any lastest package you want. XD
> cabal install <any package you want>

---

There was a weird problem when I want to install the bindings to the LLVM compiler toolkit. I got a error message about pattern matching:

..skipped..
/var/folders/KU/KUdrsAaeFWOIeZoa4Zhsqk+++TI/-Tmp-/llvm-0.9.0.145987/llvm-0.9.0.1/Setup.hs:102:70:
Couldn't match expected type `[PackageDB]'
with actual type `PackageDB'

Well, this problem is due to the error of source code...
so, the thing to do for salving it is to modify that code.

> cabal unpack llvm
> cd ~/.cabal/packages/hackage.haskell.org/llvm-<version>
for example my llvm source code is
~/.cabal/packages/hackage.haskell.org/llvm-0.9.0.1

and then, open Setup.hs with any editor, and replace packageDb by [packageDb] on the line#102 .

now, you must config, build and install by yourself:
> cabal config
> cabal build
> cabal copy

PS, if you cannot config this package
plz google for more info.
there is a big problem about 32/64-bit ghc and/or llvm...
(seems could be solved by rebuild ghc/llvm)

[LLVM] LLVM-2.7 & LLVM-0.8.0.2

一直不停re-compile llvm實在是太痛苦了，
所以好不容易弄完之後，決定來紀錄一下這整件
痛苦的事。

話說要裝llvm-2.7很簡單，就
> brew install llvm。
輕鬆、快速又好吃~
然後就想要開開心心的灌一下llvm haskell binding
結果，config一直死掉：

...snip...
checking for unistd.h... yes
checking llvm-c/Core.h usability... yes
checking llvm-c/Core.h presence... yes
checking for llvm-c/Core.h... yes
checking for LLVMModuleCreateWithName in -lLLVMCore... no
configure: error: could not find LLVM C bindings
cabal: Error: some packages failed to install:
llvm-0.8.0.2 failed during the configure step. The exception was:
exit: ExitFailure 1

上網查了以後發現問題出在Mac上面，但是實際
原因不明。總之，作法很簡單：就是把llvm-2.7
重新build成universal binary就好了，以下
重現當時機歪的整個過程(含brew的link)：

[0] 砍掉原本brew install來的llvm 2.7
> brew uninstall llvm

[0.1] 準備給homebrew用的folder
(假設homebrew的prefix=/usr/local)
> cd /usr/local/Cellar
> mkdir llvm-gcc
> mkdir llvm-gcc/4.2
> mkdir llvm
> mkdir llvm/2.7

[1] 抓一下llvm和llvm-gcc
> wget 'http://llvm.org/releases/2.7/llvm-gcc-4.2-2.7-x86_64-apple-darwin10.tgz'
> wget 'http://llvm.org/releases/2.7/llvm-2.7.tgz'
> tar xzf llvm-gcc-4.2-2.7-x86_64-apple-darwin10.tgz
> tar xzf llvm-2.7.tgz

[2] 手動安裝(copy)一下llvm-gcc-4.2到/usr/local/Cellar下面去
> cd llvm-gcc-4.2-2.7-x86_64-apple-darwin10
> cp -R ./* /usr/local/Cellar/llvm-gcc/4.2
> brew link llvm-gcc
> cd ..

[3] make/make install llvm-2.7
> cd llvm-2.7
> ./configure --prefix=/usr/local/Cellar/llvm/2.7 --with-llvmgccdir=/usr/local/Cellar/llvm-gcc/4.2
(這邊要等一會兒)
> set -x UNIVERSAL 1
> make
(這邊要等一個小時左右)
> make install
> brew link llvm
> cd ..
至此，llvm-2.7和llvm-gcc-4.2就都裝好了。

llvm重灌好以後就直接
> cabal install llvm
就ok了

llvm haskell binding裝好以後，可以跑一下
他的example。看是要去這裡抓？還是要直接
解開~/.cabal/packages/hackage.haskell.org/
llvm/0.8.0.2/llvm-0.8.0.2.tar.gz這一個檔案。進去以後直接
> make
以後再看想要執行程式即可。
如果執行起來有問題可以參考這個。

以上參考自這篇和這篇