Having an issue compiling libav for the ARM cortex-a8.
The compiler is choking on the R and Q operand codes that appear in both
intmath.h and intreadwrite.h, which it errors out on saying the Q and R
operand codes are "invalid operand"
Here is the error in intmath.h:
error: invalid operand in inline asm: 'adds $1, ${1:Q}, ${2:Q}, lsr #31
itet ne
mvnne $1, #1<<31
moveq $0, ${1:Q}
eorne $0, $1, ${1:Q}, asr #31
'
Which corresponds to this function from intmath.h
#define av_clipl_int32 av_clipl_int32_arm
static av_always_inline av_const int32_t av_clipl_int32_arm(int64_t a)
{
int x, y;
__asm__ ("adds %1, %R2, %Q2, lsr #31 \n\t"
"itet ne \n\t"
"mvnne %1, #1<<31 \n\t"
"moveq %0, %Q2 \n\t"
"eorne %0, %1, %R2, asr #31 \n\t"
: "=r"(x), "=&r"(y) : "r"(a));
return x;
}
Removing the R and Q operand codes makes the compiler happy, but obviously
the code won't function correctly
Any help with this issue would be greatly appreciated, version and
./configure information below,
Bryan
i686-apple-darwin11-llvm-gcc-4.2 (GCC) 4.2.1 (Based on Apple Inc. build
5658) (LLVM build 2336.1.00)
./configure --enable-cross-compile --arch=arm --target-os=darwin
--cc='/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc -arch
armv7 -miphoneos-version-min=5.0'
--sysroot=/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.0.sdk
--cpu=cortex-a8 --enable-pic \
--extra-ldflags=-L/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS5.0.sdk/usr/lib/system
\
--extra-cflags='-march=armv7-a -mfloat-abi=softfp' \
--enable-pic --disable-doc \
--disable-encoders --disable-decoders --disable-hwaccels \
--disable-muxers --disable-demuxers --disable-parsers --disable-bsfs \
--disable-protocols --disable-indevs --disable-outdevs --disable-devices \
--disable-filters --disable-network --disable-zlib --disable-bzlib \
--disable-armvfp --disable-neon \
--enable-decoder=h264 \
--enable-demuxer=h264 \
--enable-parser=h264
Host OS: Mac OS X Lion 10.7.2 (11C74)
Xcode: 4.2 Build 4D199
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