我正在尝试使用arm7架构编译用于IOS平台的FFMPEG库。我从http://www.ffmpeg.org下载了FFMPEG库。
我成功地为iPhoneSimulator构建了i386架构的静态库。但我需要iPhoneOS的库。使用configure命令我收到错误。以下是我的命令详情。
对于i386（没有错误）：
./configure --enable-cross-compile --disable-debug --disable-ffmpeg --disable-ffplay --disable-ffprobe --disable-ffserver --disable-doc --disable-network --disable-everything --enable-protocol=file --enable-demuxer=mov --enable-muxer=mpegts --enable-bsf=h264_mp4toannexb --arch=i386 --target-os=darwin --cc=/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/gcc --as='./gas-preprocessor/gas-preprocessor.pl /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc' --sysroot=/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneOS6.1.sdk --cpu=i386 --extra-cflags='-arch i386' --extra-ldflags='-arch i386 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator6.1.sdk' --prefix="/Users/amit/Desktop/LivuLib-master/LivuLIb/ffmpeg/bin/newLib"
对于armv7：
./configure --enable-cross-compile --disable-debug --disable-ffmpeg --disable-ffplay --disable-ffprobe --disable-ffserver --disable-doc --disable-network --disable-everything --enable-protocol=file --enable-demuxer=mov --enable-muxer=mpegts --enable-bsf=h264_mp4toannexb --arch=armv7 --target-os=darwin --cc=/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc --as='./gas-preprocessor/gas-preprocessor.pl /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc' --sysroot=/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS6.1.sdk --cpu=cortex-a9 --extra-cflags='-arch armv7' --extra-ldflags='-arch armv7 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS6.1.sdk' --prefix="/Users/amit/Desktop/LivuLib-master/LivuLIb/ffmpeg/bin/newLib"
对于Arm7的上述命令，我收到此错误：
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc is unable to create an executable file.
C compiler test failed.
If you think configure made a mistake, make sure you are using the latest
version from SVN.
所以请建议我一个可能的解决方案。为什么不起作用？或者我需要更新任何内容。感谢。
答案 0 :(得分：2)
我意识到这个问题大概是在2.5个月之前被问到的，所以提问者可能已经开始了，但我在寻找同一问题的答案时遇到了它。所以，希望这对那里的人有帮助！
我真正需要做的就是验证我使用的所有路径实际上都指向了存在的东西。
具体来说，我试图运行：
./configure \
--prefix=armv7 \
--disable-ffmpeg --disable-ffplay --disable-ffprobe --disable-ffserver \
--enable-avresample --enable-cross-compile \
--sysroot="/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS6.0.sdk" \
--target-os=darwin \
--cc="/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc" \
--extra-cflags="-arch armv7 -mfpu=neon -miphoneos-version-min=6.0" \
--extra-ldflags="-arch armv7 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS6.0.sdk -miphoneos-version-min=6.0" \
--arch=arm --cpu=cortex-a9 --enable-pic
当我无法让它工作时，我决定不再懒惰并实际检查路径中列出的目录：以“/ Applications / ...”开头的任何内容。 我发现我没有安装“iPhoneOS6.0.sdk”（它在路径中引用）。
将脚本更改为此工作：
./configure \
--prefix=armv7 \
--disable-ffmpeg --disable-ffplay --disable-ffprobe --disable-ffserver \
--enable-avresample --enable-cross-compile \
--sysroot="/applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS6.1.sdk" \
--target-os=darwin --cc="/applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc" \
--extra-cflags="-arch armv7 -mfpu=neon -miphoneos-version-min=6.0" \
--extra-ldflags="-arch armv7 -isysroot /applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS6.1.sdk -miphoneos-version-min=6.0" \
--arch=arm --cpu=cortex-a9 --enable-pic
简而言之，只需仔细检查您的路径即可。希望有所帮助！