[osx] 發現 ARCHFLAGS 的妙用

試著用 easy_install 安裝 PIL 結果發生問題：

qrtt1$ sudo easy_install -U pil

Searching for pil

Reading http://pypi.python.org/simple/pil/

Reading http://www.pythonware.com/products/pil

Reading http://effbot.org/zone/pil-changes-115.htm

Reading http://effbot.org/downloads/#Imaging

Best match: PIL 1.1.7

Downloading http://effbot.org/media/downloads/PIL-1.1.7.tar.gz

Processing PIL-1.1.7.tar.gz

Running PIL-1.1.7/setup.py -q bdist_egg --dist-dir /var/folders/aQ/aQLNlFLOF28xewK2A7i0X++++TM/-Tmp-/easy_install-eVQU9j/PIL-1.1.7/egg-dist-tmp-L149wy

--- using frameworks at /System/Library/Frameworks

_imaging.c:3017: warning: initialization from incompatible pointer type

_imaging.c:3077: warning: initialization from incompatible pointer type

/usr/libexec/gcc/powerpc-apple-darwin10/4.2.1/as: assembler (/usr/bin/../libexec/as/ppc/as or /usr/bin/../local/libexec/as/ppc/as) for architecture ppc not installed

Installed assemblers are:

/usr/bin/../libexec/as/x86_64/as for architecture x86_64

/usr/bin/../libexec/as/i386/as for architecture i386

/usr/bin/../libexec/as/arm/as for architecture arm

_imaging.c:3017: warning: initialization from incompatible pointer type

_imaging.c:3077: warning: initialization from incompatible pointer type

_imaging.c:3281: fatal error: error writing to -: Broken pipe

compilation terminated.

_imaging.c:3017: warning: initialization from incompatible pointer type

_imaging.c:3077: warning: initialization from incompatible pointer type

lipo: can't open input file: /var/folders/aQ/aQLNlFLOF28xewK2A7i0X++++TM/-Tmp-//ccCj3S35.out (No such file or directory)

error: Setup script exited with error: command 'gcc-4.2' failed with exit status 1

看了一下 log 訊息，發現怎麼多了編譯 arm 版本的動作呢？在網上也找到有人分享了它的解法，重點在於如何讓 easy_install 只編譯我們真正需要用到的 x86_64 與 i386 版本。原來重點在於 ARCHFLAGS 的使用：

sudo ARCHFLAGS="-arch i386 -arch x86_64" easy_install -U pil

感謝 Installing python PIL in MAC OS, having xcode4 提供的解決之道 :D