opencore-amr-iOS 編譯支持bitcode的lib文件

最近因工做須要使用到opencore-amr-iOS庫,進行caf格式與amr格式互轉, 但當前的lib是不支持bitcode選項的, 所以我須要將opencore-amr-iOS從新編一個支持bitcode的版本. 

因而先從github中下載對應的源碼, 誰知道這個源碼已經4年沒有更新了, 事已至此只能碰碰運氣看可否正常工做. 果不其然, 自動編譯的腳本只支持到了XCode6, 在XCode8環境下編譯不經過.

沒辦法只能google看看有沒有碰到一樣問題的哥們, 還真能找個一個哥們也在作一樣的事情, 附上連接:http://www.code4app.com/blog-721976-132.html; 心中一陣竊喜, 我按照他的步驟結果失敗了, 報了好多錯誤. 好在咱不是輕易放棄的人, 有問題一個一個解決唄.

首先碰到的是:

checking whether we are cross compiling... configure: error: in `/Users/tbwx/test/opencore-amr-iOS':
configure: error: cannot run C++ compiled programs.
If you meant to cross compile, use `--host'.
See `config.log' for more details

通過一番測試,修改build_ios_xcode6.sh文件中41行: ./configure
--prefix=$DEST
--disable-shared 在configure \下面增長 --host=$arch
OK, 編譯經過了.

而後就是解決bitcode的問題了, 根據上面博客中的內容,重要的是在編譯選項中增長bitcode相關的開關, 因而乎,在編譯選項中增長了可是又報錯了:

configure: error: in `/Users/tbwx/test/opencore-amr-iOS':
configure: error: C++ compiler cannot create executables
See `config.log' for more details

查看config.log中的日誌:

clang: error: argument to '-V' is missing (expected 1 value)
clang: error: no input files
configure:3469: $? = 1

看來問題出在config這個文件裏, 從文件裏找到-V的地方,通通刪掉,再來一次. 結果仍是報錯:

platform/Developer/SDKs/iPhoneOS10.2.sdk -isystem /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS10.2.sdk/usr/include  -fembed-bitcode   -Wl,-syslibroot,/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS10.2.sdk conftest.cpp  >&5
clang: warning: libstdc++ is deprecated; move to libc++ with a minimum deployment target of iOS 7
ld: only one -syslibroot is accepted for bitcode bundle for architecture armv7
clang: error: linker command failed with exit code 1 (use -v to see invocation)

看來這原始的腳本兼容性不行啊, 繼續改,將build_ios_xcode6.sh中的第31行,-syslibroot,$SDK的編譯選項刪除, go on. ....編譯中..... 經過了!!

將lib文件替換原來的, 在將項目的bitcode選項改成YES, 運行正常!

附上最終的編譯文件:

#!/bin/sh
set -xe

DEVELOPER=`xcode-select -print-path`
DEST=`pwd .`"/opencore-amr-iOS"
 
ARCHS="i386 x86_64 armv7 armv7s arm64"
LIBS="libopencore-amrnb.a libopencore-amrwb.a"
# Note that AMR-NB is for narrow band http://en.wikipedia.org/wiki/Adaptive_Multi-Rate_audio_codec
# for AMR-WB encoding, refer to http://sourceforge.net/projects/opencore-amr/files/vo-amrwbenc/
# or AMR Codecs as Shared Libraries http://www.penguin.cz/~utx/amr

mkdir -p $DEST

./configure

for arch in $ARCHS; do
	make clean
	IOSMV=" -miphoneos-version-min=7.0"
	case $arch in
	arm*)
		if [ $arch == "arm64" ]
		then
			IOSMV=" -miphoneos-version-min=7.0"
		fi
		echo "Building opencore-amr for iPhoneOS $arch ****************"
		PATH=`xcodebuild -version -sdk iphoneos PlatformPath`"/Developer/usr/bin:$PATH" \
		SDK=`xcodebuild -version -sdk iphoneos Path` \
		CXX="xcrun --sdk iphoneos clang++ -arch $arch $IOSMV --sysroot=$SDK -isystem $SDK/usr/include  -fembed-bitcode" \
		LDFLAGS="-Wl" \
		./configure \
		--host=arm-apple-darwin \
		--prefix=$DEST \
		--disable-shared
		;;
	*)
		echo "Building opencore-amr for iPhoneSimulator $arch *****************"
		PATH=`xcodebuild -version -sdk iphonesimulator PlatformPath`"/Developer/usr/bin:$PATH" \
		CXX="xcrun --sdk iphonesimulator clang++ -arch $arch $IOSMV  -fembed-bitcode" \
		./configure \
		--host=$arch \
		--prefix=$DEST \
		--disable-shared
		;;
	esac
	make -j3
	make install
	for i in $LIBS; do
		mv $DEST/lib/$i $DEST/lib/$i.$arch
	done
done

echo "Merge into universal binary."

for i in $LIBS; do
	input=""
	for arch in $ARCHS; do
		input="$input $DEST/lib/$i.$arch"
	done
	xcrun lipo -create -output $DEST/lib/$i $input
done