Compile ffmpeg for Android on OSX failes (ld)

[Fabian Schuetz]

Summary of the bug:
during compilation of libavutil

following error shows up:

LD libavutil/libavutil.52.dylib
/Users/fschuetz/tmp/ffmpeg/build/toolchain/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: -single_module: unknown option
/Users/fschuetz/tmp/ffmpeg/build/toolchain/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: use the --help option for usage information
collect2: ld returned 1 exit status
make: * [libavutil/libavutil.52.dylib] Error 1

How to reproduce:
checkout ​https://github.com/FFmpeg/FFmpeg

build, using ndk9:

---

#!/bin/bash

##CONFIGURATION ###################################################

NDK=/opt/android-ndk-r9
TARGET_OS=darwin
BUILD=$(pwd)/build/dest
TOOLCHAIN=$(pwd)/build/toolchain
SYSROOT=$TOOLCHAIN/sysroot

FFMPEG_FLAGS="--prefix=${BUILD} \

--target-os=${TARGET_OS} \
--arch=arm \
--enable-thumb \
--enable-cross-compile \
--cross-prefix=arm-linux-androideabi- \
--disable-programs \
--disable-everything \
--disable-asm \
--disable-symver \
--disable-doc \
--disable-devices \
--disable-bsfs \
--disable-network \
--enable-avdevice \
--enable-avcodec \
--enable-avutil \
--enable-swresample \
--enable-swscale \
--enable-debug \
--disable-postproc \
--disable-avfilter \
--enable-gpl \
--enable-version3 \
--enable-shared \

--enable-static \
--enable-rdft \
--enable-ffmpeg \
--enable-protocol=file
--enable-parser=aac \
--enable-parser=ac3 \
--enable-parser=mpegaudio \
--enable-demuxer=aac \
--enable-demuxer=ac3 \
--enable-demuxer=ape \
--enable-demuxer=asf \
--enable-demuxer=flac \
--enable-demuxer=matroska_audio \
--enable-demuxer=mp3 \
--enable-demuxer=mpc \
--enable-demuxer=mov \
--enable-demuxer=mpc8 \
--enable-demuxer=ogg \
--enable-demuxer=tta \
--enable-demuxer=wav \
--enable-demuxer=wv \
--enable-decoder=aac \
--enable-decoder=ac3 \
--enable-decoder=alac \
--enable-decoder=ape \
--enable-decoder=flac \
--enable-decoder=mp1 \
--enable-decoder=mp2 \
--enable-decoder=mp3 \
--enable-decoder=mpc7 \
--enable-decoder=mpc8 \
--enable-decoder=tta \
--enable-decoder=vorbis \
--enable-decoder=wavpack \
--enable-decoder=wmav1 \
--enable-decoder=wmav2 \
--enable-decoder=pcm_alaw \
--enable-decoder=pcm_dvd \
--enable-decoder=pcm_f32be \
--enable-decoder=pcm_f32le \
--enable-decoder=pcm_f64be \
--enable-decoder=pcm_f64le \
--enable-decoder=pcm_s16be \
--enable-decoder=pcm_s16le \
--enable-decoder=pcm_s16le_planar \
--enable-decoder=pcm_s24be \
--enable-decoder=pcm_daud \
--enable-decoder=pcm_s24le \
--enable-decoder=pcm_s32be \
--enable-decoder=pcm_s32le \
--enable-decoder=pcm_s8 \
--enable-decoder=pcm_u16be \
--enable-decoder=pcm_u16le \
--enable-decoder=pcm_u24be \
--enable-decoder=pcm_u24le \
--enable-decoder=rawvideo"

##END ###################################################

$NDK/build/tools/make-standalone-toolchain.sh --toolchain=arm-linux-androideabi-4.6 --platform=android-14 --system=darwin-x86_64 --install-dir=$TOOLCHAIN

export PATH=$TOOLCHAIN/bin:$PATH
export CC=arm-linux-androideabi-gcc
export LD=arm-linux-androideabi-ld
export AR=arm-linux-androideabi-ar

CFLAGS="-O3 -Wall -mthumb -pipe -fpic -fasm \

-finline-limit=300 -ffast-math \
-fstrict-aliasing -Werror=strict-aliasing \
-fmodulo-sched -fmodulo-sched-allow-regmoves \
-Wno-psabi -Wa,--noexecstack \
-DANDROID -DNDEBUG"

EXTRA_CFLAGS="-march=armv7-a -mthumb -mthumb-interwork -mfpu=neon -mfloat-abi=softfp -mvectorize-with-neon-quad"
EXTRA_LDFLAGS="-Wl,--fix-cortex-a8"

./configure $FFMPEG_FLAGS --extra-cflags="$CFLAGS $EXTRA_CFLAGS" --extra-ldflags="$EXTRA_LDFLAGS"

make clean
make -j
make install

---

built on osx 10.8

Patches should be submitted to the ffmpeg-devel mailing list and not this bug tracker.

[Fabian Schuetz]

-single_module is added to the linker from the configure script (3496):

---

SHFLAGS='-dynamiclib -Wl,-single_module -Wl,-install_name,$(SHLIBDIR)/$(SLIBNAME_W\
ITH_MAJOR),-current_version,$(LIBVERSION),-compatibility_version,$(LIBMAJOR)'

---

unfortunately
-install_name
-current_version
-compatibility_version
are also unknown

also problematic is the following line (3499)
---
add_ldflags -Wl,-dynamic,-search_paths_first
---
as search_paths_first throws an error, too

If i remove all those flags and write the following:
---
SHFLAGS='-dynamiclib'
add_ldflags -WL,-dynamic
---

I get the following error:
---
LD libavutil/libavutil.52.dylib
/Users/fschuetz/tmp/ffmpeg/build/toolchain/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: /Users/fschuetz/tmp/ffmpeg/build/toolchain/bin/../sysroot/usr/lib/crtbegin_dynamic.o: in function _start:crtbrand.c(.text+0x78): error: undefined reference to 'main'
collect2: ld returned 1 exit status
make: * [libavutil/libavutil.52.dylib] Error 1
---

[Carl Eugen Hoyos]

Sorry if I miss something but isn't there a tiny difference between "darwin" (the target_os you set in your script and "Android" (the target_os in the ticket's title)?

Your configure script is unfortunately impossible to parse (apparently even for you), please don't use it, instead start with a minimal configure line, something like ./configure --cross-prefix=arm-linux-androideabi- --target-os=linux --arch=armv7-a and once that works, add your remaining (mostly strange) options that you believe to need.

[Fabian Schuetz]

Yeah thanks. You got that all figured out. I did not name those options and you obviously have no clue what you are talking about. But if you run across any splendid documentation on all the configure options, let me know.

[Carl Eugen Hoyos]

Replying to fscz:

Yeah thanks. You got that all figured out. I did not name those options

Which options did you not name?

and you obviously have no clue what you are talking about.

That is probably true, however since you obviously need support and don't have a bug to report, please use the ffmpeg-user mailing list.

But if you run across any splendid documentation on all the configure options, let me know.

configure --help works fine here.

[Fabian Schuetz]

You should go to bed. If you're lucky, you're back to normal tomorrow.
If not, I fear the worst.

By the way, I was able to solve this by changing:

--enable-shared \
--enable-static \

to

--enable-static \

from the sparse documentation in the ./configure
scripts it is not really clear, what those options do:

--disable-static do not build static libraries [no]
--enable-shared build shared libraries [no]

[Carl Eugen Hoyos]

Replying to fscz:

You should go to bed. If you're lucky, you're back to normal tomorrow.

You mean tomorrow darwin and Android will be the same?