clang error invalid version number in -miphoneos-version-min=.sd - ios

Question

When i compile librtmp for ios, the script shows below:
#!/bin/sh
# OS X Yosemite, Xcode 6.1
set -ex
DEVELOPER="/Applications/Xcode.app/Contents/Developer"
DEVICE_SDK="$DEVELOPER/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk"
SIMULATOR_SDK="$DEVELOPER/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk"
CURRPATH=`pwd`
SOURCE="rtmpdump"
DSTDIR="librtmp"
LIBSSL=`cd ../OpenSSL/libssl;pwd`
ARCHS="i386 x86_64 armv7 armv7s arm64"
rm -rf $DSTDIR
mkdir $DSTDIR
if [ ! -d $SOURCE ]; then
git clone git://git.ffmpeg.org/rtmpdump $SOURCE
else
cd $SOURCE
git fetch
cd ..
fi
cd $SOURCE/librtmp
for ARCH in $ARCHS; do
mkdir -p ../$DSTDIR/$ARCH
if [[ $ARCH == arm* ]]; then
SDK=$DEVICE_SDK
else
SDK=$SIMULATOR_SDK
fi
perl -i -pe 's|^AR=\$\(CROSS_COMPILE\)ar|AR=xcrun ar|' Makefile
CROSS_COMPILE="$DEVELOPER/usr/bin/" \
XCFLAGS="-O0 -isysroot $SDK -I$LIBSSL/include -arch $ARCH " \
XLDFLAGS="-isysroot $SDK -L$LIBSSL/lib -arch $ARCH -miphoneos-version-min=7.0 " \
make SYS=darwin
make SYS=darwin prefix="$CURRPATH/$DSTDIR/$ARCH" install
make clean
done
mkdir -p $CURRPATH/$DSTDIR/lib
cd $CURRPATH/$DSTDIR/$ARCH/lib
LIBS=`ls *.a`
cd $CURRPATH
for LIB in $LIBS; do
lipo -create `find $DSTDIR -name $LIB` -output $DSTDIR/lib/$LIB
done
cp -rf $DSTDIR/$ARCH/include $DSTDIR
for ARCH in $ARCHS; do
rm -rf $DSTDIR/$ARCH
done
when statement make SYS=darwin runs, error shows:
/Applications/Xcode.app/Contents/Developer/usr/bin/gcc -Wall -O0 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk -I/Users/Smeegol/Desktop/AVCodecs2/OpenSSL/libssl/include -arch armv7 -DRTMPDUMP_VERSION=\"v2.4\" -DUSE_OPENSSL -O2 -fPIC -c -o rtmp.o rtmp.c
clang: error: invalid version number in '-miphoneos-version-min=.sd'
make: *** [rtmp.o] Error 1
Why? I have set XLDFLAGS="-isysroot $SDK -L$LIBSSL/lib -arch $ARCH -miphoneos-version-min=7.0 " and why invalid version number in '-miphoneos-version-min=.sd' occurs?

Answer 1

I had the same problem and resolved it by changing the -isysroot argument from:
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk
to:
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS8.3.sdk
Note that the latter is a symlink to the former on my system.
It appears that clang is implicitly setting -miphoneos-version-min= from the iPhoneOSXXX.sdk directory name. Using the link with the version number in it seems to fix the compilation issue.