近期升級了系統到Mac OS X 10.10 而且更新了XCode6.1和iOS 8.1

之前app用到的libmp3lame.a靜態庫。也要支持64位的模擬器(x86_64)和64位的真機(arm64）指令集。須要又一次編譯

查閱了下資料，依照例如以下步驟，並做了些凝視和修改

1.http://sourceforge.net/projects/lame/files/lame/3.99/ 下載lame的最新版本號解壓到一個文件夾裏比如 lame，全路徑例如以下/Users/8wm/Desktop/lame

2.下載build的腳本。我這裏使用的是國外一個朋友的分享

https://github.com/kewlbear/lame-ios-build

下載之後得到lame-build.sh復制到文件夾/Users/8wm/Desktop/lame

3.用bbedit或者其它編輯器打開這個腳本，依照凝視修改

4.打開Terminals。

輸入

cd /Users/8wm/Desktop/lame

chmod 777 lame-build.sh

sudo -s#

輸入系統password

./lame-build.sh

開始編譯。編譯完畢之後。生成fat-lame文件夾和thin-lame文件夾。分別存放合並全部指令集的靜態庫，以及各指令集的靜態庫.

依據所需。copy lame.h和

能夠使用命令行，查看換個庫支持的指令集。

lipo -info libmp3lame.a

Architectures in the fat file: libmp3lame.a are: armv7 armv7s i386 x86_64 arm64

下面是build的腳本，請註意黃色的字和凝視。

#!/bin/sh

make distclean

CONFIGURE_FLAGS="--disable-shared --disable-frontend"

ARCHS="arm64 armv7s x86_64 i386 armv7"

# directories
# SOURCE是下載lame源代碼包，解壓後的文件夾，能夠把sh腳本放到這個文件夾，source改為""
SOURCE=""
# FAT是全部指令集build後，輸出的文件夾。全部靜態庫被合並成一個靜態庫
FAT="fat-lame"

# SCRATCH是下載lame源代碼包，解壓後的文件夾，必須是絕對路徑
SCRATCH="/Users/8wm/Desktop/lame"
# must be an absolute path
# THIN 各自指令集build後輸出的靜態庫所在的文件夾，每一個指令集為一個靜態庫
THIN=`pwd`/"thin-lame"

COMPILE="y"
LIPO="y"

if [ "$*" ]
then
	if [ "$*" = "lipo" ]
	then
		# skip compile
		COMPILE=
	else
		ARCHS="$*"
		if [ $# -eq 1 ]
		then
			# skip lipo
			LIPO=
		fi
	fi
fi

if [ "$COMPILE" ]
then
	CWD=`pwd`
	echo "$CWD/$SOURCE........."
	for ARCH in $ARCHS
	do
		echo "building $ARCH..."
		mkdir -p "$SCRATCH/$ARCH"
		cd "$SCRATCH/$ARCH"

		if [ "$ARCH" = "i386" -o "$ARCH" = "x86_64" ]
		then
		    PLATFORM="iPhoneSimulator"
		    if [ "$ARCH" = "x86_64" ]
		    then
		    	SIMULATOR="-mios-simulator-version-min=7.0"
                        HOST=x86_64-apple-darwin
		    else
		    	SIMULATOR="-mios-simulator-version-min=5.0"
                        HOST=i386-apple-darwin
		    fi
		else
		    PLATFORM="iPhoneOS"
		    SIMULATOR=
                    HOST=arm-apple-darwin
		fi

		XCRUN_SDK=`echo $PLATFORM | tr ‘[:upper:]‘ ‘[:lower:]‘`
		CC="xcrun -sdk $XCRUN_SDK clang -arch $ARCH"
		#AS="$CWD/$SOURCE/extras/gas-preprocessor.pl $CC"
		CFLAGS="-arch $ARCH $SIMULATOR"
		CXXFLAGS="$CFLAGS"
		LDFLAGS="$CFLAGS"

		CC=$CC $CWD/$SOURCE/configure 		    $CONFIGURE_FLAGS                     --host=$HOST 		    --prefix="$THIN/$ARCH"                     CC="$CC" CFLAGS="$CFLAGS" LDFLAGS="$LDFLAGS"

		make -j3 install
		cd $CWD
	done
fi

if [ "$LIPO" ]
then
	echo "building fat binaries..."
	mkdir -p $FAT/lib
	set - $ARCHS
	CWD=`pwd`
	cd $THIN/$1/lib
	for LIB in *.a
	do
		cd $CWD
		lipo -create `find $THIN -name $LIB` -output $FAT/lib/$LIB
	done

	cd $CWD
	cp -rf $THIN/$1/include $FAT
fi

Mac OS X10.10_xcode6.1_ios8.1環境下，編譯lame靜態庫libmp3lame.a，支持arm64 armv7s x86_64 i386 armv7指令集