Compile FFmpeg for iOS using Xcode5.1 error - ios

Question

Environment: Mac OS X 10.9.2, Xcode 5.1. Build shell scripts as below:
#!/bin/sh
# OS X 10.9.2, Xcode 5.1
set -ex
VERSION="2.2.1"
SDKVERSION="7.1"
BUILDDIR=`pwd`
DESTDIR="ffmpeg-built"
OUTPUTDIR="dependencies"
DEVELOPER=`xcode-select -print-path`
GASPREPROCESSOR="gas-preprocessor.pl"
ARCHS="i386 x86_64 armv7 armv7s arm64"
cp $GASPREPROCESSOR /usr/local/bin
rm -rf $DESTDIR
mkdir $DESTDIR
rm -rf $OUTPUTDIR
mkdir $OUTPUTDIR
mkdir -p $OUTPUTDIR/bin
mkdir -p $OUTPUTDIR/include
mkdir -p $OUTPUTDIR/lib
if [ ! -e "ffmpeg-$VERSION.tar.bz2" ]; then
curl -LO http://ffmpeg.org/releases/ffmpeg-$VERSION.tar.bz2
fi
tar jxf ffmpeg-$VERSION.tar.bz2
cd "ffmpeg-$VERSION"
set +e
CCACHE=`which ccache`
if [ $? == "0" ]; then
CCACHE="$CCACHE "
else
CCACHE=""
fi
set -e
for ARCH in $ARCHS;
do
mkdir -p ../$DESTDIR/$ARCH
make distclean
IOSMV="-miphoneos-version-min=4.3"
if [ $ARCH == "arm64" ]; then
IOSMV="-miphoneos-version-min=7.0"
fi
CONFIG="--disable-ffmpeg --disable-ffplay --disable-ffprobe --disable-ffserver --enable-avresample --enable-cross-compile"
if [ "$ARCH" == "i386" ];
then
PLATFORM="iPhoneSimulator"
EXTRA_CONFIG="--arch=i386 --target-os=darwin --cpu=i386 --disable-asm --enable-pic"
EXTRA_CFLAGS="-arch i386"
EXTRA_LDFLAGS="-I$DEVELOPER/Platforms/$PLATFORM.platform/Developer/SDKs/$PLATFORM$SDKVERSION.sdk/usr/lib -mfpu=neon"
else
PLATFORM="iPhoneOS"
EXTRA_CONFIG="--arch=arm --target-os=darwin --cpu=cortex-a8 --disable-armv5te --enable-pic"
EXTRA_CFLAGS="-w -arch $ARCH -mfpu=neon"
EXTRA_LDFLAGS="-mfpu=neon"
fi
./configure --prefix=$BUILDDIR/$DESTDIR/$ARCH --disable-ffmpeg --disable-ffplay --disable-ffprobe --disable-ffserver --disable-iconv --disable-bzlib --enable-avresample --sysroot="$DEVELOPER/Platforms/$PLATFORM.platform/Developer/SDKs/$PLATFORM$SDKVERSION.sdk" --cc="$DEVELOPER/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang" --as='/usr/local/bin/$GASPREPROCESSOR' --extra-cflags="$EXTRA_CFLAGS -miphoneos-version-min=$SDKVERSION -I$BUILDDIR/$OUTPUTDIR/include" --extra-ldflags="-arch $ARCH $EXTRA_LDFLAGS -isysroot $DEVELOPER/Platforms/$PLATFORM.platform/Developer/SDKs/$PLATFORM$SDKVERSION.sdk -miphoneos-version-min=$SDKVERSION -L$BUILDDIR/$OUTPUTDIR/lib" $EXTRA_CONFIG --enable-pic --extra-cxxflags="$CPPFLAGS -I$BUILDDIR/$OUTPUTDIR/include -isysroot $DEVELOPER/Platforms/$PLATFORM.platform/Developer/SDKs/$PLATFORM$SDKVERSION.sdk"
make
make install
done
make distclean
cd ..
mkdir -p $DESTDIR/universal/lib
cd $DESTDIR/i386/lib
for FILE in *.a;
do
INPUT=""
for ARCH in $ARCHS;
do
INPUT="$INPUT $DESTDIR/$ARCH/lib/$FILE"
done
lipo -create $INPUT -output $DESTDIR/universal/lib/$FILE
done
But terminal logs that:
+ VERSION=2.2.1
+ SDKVERSION=7.1
++ pwd
+ BUILDDIR=/Users/Smeegol/Desktop/FFmpeg
+ DESTDIR=ffmpeg-built
++ xcode-select -print-path
+ DEVELOPER=/Applications/Xcode.app/Contents/Developer
+ ARCHS='i386 x86_64 armv7 armv7s arm64'
+ rm -rf ffmpeg-built
+ mkdir ffmpeg-built
+ '[' '!' -e ffmpeg-2.2.1.tar.bz2 ']'
+ tar jxf ffmpeg-2.2.1.tar.bz2
+ cd ffmpeg-2.2.1
+ set +e
++ which ccache
+ CCACHE=
+ '[' 1 == 0 ']'
+ CCACHE=
+ set -e
+ for ARCH in '$ARCHS'
+ mkdir -p ../ffmpeg-built/i386
+ IOSMV=-miphoneos-version-min=4.3
+ '[' i386 == arm64 ']'
+ CONFIG='--disable-ffmpeg --disable-ffplay --disable-ffprobe --disable-ffserver --enable-avresample --enable-cross-compile'
+ '[' i386 == i386 ']'
+ PLATFORM=iPhoneSimulator
+ EXTRA_CONFIG='--arch=i386 --target-os=darwin --cpu=i386 --enable-pic --disable-asm'
+ EXTRA_CFLAGS='-arch i386 -mfpu=neon -miphoneos-version-min=4.3'
+ ./configure --prefix=/Users/Smeegol/Desktop/FFmpeg/ffmpeg-built/i386 --disable-ffmpeg --disable-ffplay --disable-ffprobe --disable-ffserver --enable-avresample --enable-cross-compile --sysroot=/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator7.1.sdk --cc=/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang --extra-cflags=-arch i386 -mfpu=neon -miphoneos-version-min=4.3 '--extra-ldflags=-arch i386 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator7.1.sdk -miphoneos-version-min=4.3' --arch=i386 --target-os=darwin --cpu=i386 --enable-pic --disable-asm
Unknown option "i386".
See ./configure --help for available options.
Why Unknown option "i386".?

Answer 1

--extra-cflags=-arch i386 -mfpu=neon -miphoneos-version-min=4.3
Two things seem wrong here.
First, the config.log is showing that --extra-cflags=<args> is not getting escaped properly. Thus, FFmpeg's ./configure script is seeing --extra-cflags=-arch, i386, -mfpu=neon; i386 alone is not a valid flag for the script, so it fails.
You can compare your script to the one I maintain on github. I wonder what happens if you use variable expansions in the script, instead of variable replacement? e.g.
--extra-cflags="$EXTRA_CFLAGS -miphoneos-versi....
... try:
--extra-cflags="${EXTRA_CFLAGS} -miphoneos-versi....
Second, -mfpu=neon and -arch i386 together don't make sense. It looks like this script is going through the branch of the big if statement that contains PLATFORM="iPhoneOS", and not PLATFORM="iPhoneSimulator". That's just not going to work.
So, I'm not 100% sure of the fix, but those are some of your problems.