Trying to compile (cross) with android arm64

[matthe...@gmail.com]

Hello, I am new to compiling with libvpx and ideally I want to cross compile with FFMPEG on android. Before I get there I am having issues compiling libvpx.

I am using ubuntu 16.04, cloned https://chromium.googlesource.com/webm/libvpx and then tried to configure with the 

./configure  --target=arm64-android-gcc --disable-examples

And i get an error when make: 

vpx_dsp/arm/idct4x4_1_add_neon.c:11:22: fatal error: arm_neon.h: No such file or directory
 #include <arm_neon.h>

I thought maybe I need to add the sdk_path, downloaded ndk r16e for linux and then (also tried to point to a standalone toolchain, didn't work either)

 ./configure  --target=arm64-android-gcc --disable-examples --sdk-path=$NDK

Failed configuration, checked config.log and at the end

android-ndk-r16b/toolchains/arm-linux-androideabi-4.9/prebuilt/linux-x86_64/bin/arm-linux-androideabi-gcc --sysroot=/hdd/Android/android-ndk-r16b/platforms/android-27/arch-arm -DNDEBUG -O3 -fPIC -Wall -Wdeclaration-after-statement -Wdisabled-optimization -Wfloat-conversion -Wpointer-arith -Wtype-limits -Wcast-qual -Wvla -Wimplicit-function-declaration -Wuninitialized -Wunused -Wextra -Wundef -E -o /tmp/vpx-conf-2697-2985.o /tmp/vpx-conf-2697-2985.c

/tmp/vpx-conf-2697-2985.c:1:19: fatal error: stdio.h: No such file or directory
 #include "stdio.h"
                   ^
compilation terminated.

Is it pointing to the non-64 bit toolchain (it is autogenerated...)? 

Then I tried using external build,

 ./configure  --target=arm64-android-gcc --disable-examples --sdk-path=$NDK --enable-external-build

That worked, then make gives an error:

   disabling examples
  enabling external_build
  enabling vp8_encoder
  enabling vp8_decoder
  enabling vp9_encoder
  enabling vp9_decoder
Configuring for target 'arm64-android-gcc'
  enabling arm64
  enabling neon
  enabling realtime_only
  enabling webm_io
  enabling libyuv
Bypassing toolchain for environment detection.
Creating makefiles for arm64-android-gcc libs
Creating makefiles for arm64-android-gcc tools
Creating makefiles for arm64-android-gcc docs
ngmatthew@ngmatthew:~/Android/libvpx$ 
ngmatthew@ngmatthew:~/Android/libvpx$ make -j64^C
ngmatthew@ngmatthew:~/Android/libvpx$ make -j64
make[1]: Nothing to be done for `all'.
    [CC] tools/tiny_ssim.c.o
arm-linux-androideabi-gcc: error: unrecognized command line option '-Wparentheses-equality'
arm-linux-androideabi-gcc: error: unrecognized command line option '-Wshorten-64-to-32'
make[1]: *** [tools/tiny_ssim.c.o] Error 1
make: *** [.DEFAULT] Error 2

Then I tried to do the way I am compiling other libraries with cflags. Created a arm64 standalone toolchain

$NDK/build/tools/make_standalone_toolchain.py     --arch arm64 --api 27 --install-dir /tmp/toolchain

export TOOL= /tmp/toolchain

Then the configure

./configure  --target=arm64-android-gcc --disable-examples --prefix=prefix --extra-cflags=" -I$TOOL/lib/gcc/aarch64-linux-android/4.9.x/include/ -L$TOOL/sysroot/usr/lib -D__ANDROID_API__=27 -isystem $TOOL/sysroot/usr/include/aarch64-linux-android/ -I$TOOL/system/usr/include/aarch64-linux-android/"

I checked all the paths (and they work) but not sure about the cflags. Then I run make  and I get a bunch of errors similar to

/hdd/Android/tmp/toolchain//lib/gcc/aarch64-linux-android/4.9.x/include/arm_neon.h:86:1: error: unknown type name ‘__builtin_aarch64_simd_poly16’
 typedef __builtin_aarch64_simd_poly16 poly16_t;
 ^

What am I missing or doing wrong? Thanks in advance!

 

 

[Johann Koenig]

On Tue, Jan 30, 2018 at 11:49 AM <matthe...@gmail.com> wrote:

Hello, I am new to compiling with libvpx and ideally I want to cross compile with FFMPEG on android. Before I get there I am having issues compiling libvpx.

I am using ubuntu 16.04, cloned https://chromium.googlesource.com/webm/libvpx and then tried to configure with the 

./configure  --target=arm64-android-gcc --disable-examples

Can you try --target=arm64-linux-gcc instead? the -android- targets tried to do some tricky things wrt guessing some settings in the NDK which may have changed. linux binaries should run just fine on android. 

[Zach Reedy]

Hello,

I'm having a similar issue!

I tried Johann's suggestion of targeting arm64-android-gcc but I get the same error: "Unable to find arm_neon.h"

My environment is cygwin. NDK is installed via Android Studio.

Did you happen to find a solution to this?

Or would anyone happen to know where arm_neon.h resides? What library or toolchain does it belong to?

Cheers,

Zach Reedy

[Алексей Мицкевич]

Hello,

Having similar problem, but on macOS and for target=armv7-android-gcc.

Log:

gcc -DNDEBUG -O3 -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=0 -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -Wall -Wdeclaration-after-statement -Wdisabled-optimization -Wfloat-conversion -Wparentheses-equality -Wpointer-arith -Wtype-limits -Wcast-qual -Wvla -Wimplicit-function-declaration -Wmissing-declarations -Wmissing-prototypes -Wuninitialized -Wunreachable-code-loop-increment -Wunused -Wextra -Wundef -Wframe-larger-than=52000 -std=gnu89 -Wshorten-64-to-32 -E -o /var/folders/17/9sjpmrvj5sqf9t2kxhn18q080000gq/T//vpx-conf-50871-23808.o /var/folders/17/9sjpmrvj5sqf9t2kxhn18q080000gq/T//vpx-conf-50871-23808.c

In file included from /var/folders/17/9sjpmrvj5sqf9t2kxhn18q080000gq/T//vpx-conf-50871-23808.c:1:

/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/11.0.3/include/arm_neon.h:28:2: error: "NEON support not enabled"

#error "NEON support not enabled"

 ^

1 error generated.

Would be appreciate for any help!

четверг, 8 апреля 2021 г. в 03:00:22 UTC+3, Zach Reedy:

[James Zern]

Hi,

On Wed, Apr 7, 2021 at 5:00 PM Zach Reedy <zach...@gmail.com> wrote:

Hello,

I'm having a similar issue!

I tried Johann's suggestion of targeting arm64-android-gcc but I get the same error: "Unable to find arm_neon.h"

My environment is cygwin. NDK is installed via Android Studio.

Did you happen to find a solution to this?

Or would anyone happen to know where arm_neon.h resides? What library or toolchain does it belong to?

By default configure will attempt to use gcc as the compiler, to use the toolchain in the ndk directly you'll need a few more options. Something like the following will work if you adjust the path for your cygwin install:

$ export PATH=$PATH:<path-to-android-ndk>/toolchains/llvm/prebuilt/linux-x86_64/bin

$ CROSS=arm-linux-androideabi- CC=armv7a-linux-androideabi21-clang CXX=armv7a-linux-androideabi21-clang++ ../libvpx/configure --target=armv7-android-gcc

$ make -j

If you're building with Android.mk files there is another option documented in build/make/Android.mk:

https://chromium.googlesource.com/webm/libvpx/+/refs/tags/v1.10.0/build/make/Android.mk#12

 

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[James Zern]

Hi,

On Wed, Apr 14, 2021 at 10:30 AM Алексей Мицкевич <aleks.mi...@gmail.com> wrote:

Hello,

Having similar problem, but on macOS and for target=armv7-android-gcc.

Log:

gcc -DNDEBUG -O3 -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=0 -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -Wall -Wdeclaration-after-statement -Wdisabled-optimization -Wfloat-conversion -Wparentheses-equality -Wpointer-arith -Wtype-limits -Wcast-qual -Wvla -Wimplicit-function-declaration -Wmissing-declarations -Wmissing-prototypes -Wuninitialized -Wunreachable-code-loop-increment -Wunused -Wextra -Wundef -Wframe-larger-than=52000 -std=gnu89 -Wshorten-64-to-32 -E -o /var/folders/17/9sjpmrvj5sqf9t2kxhn18q080000gq/T//vpx-conf-50871-23808.o /var/folders/17/9sjpmrvj5sqf9t2kxhn18q080000gq/T//vpx-conf-50871-23808.c

In file included from /var/folders/17/9sjpmrvj5sqf9t2kxhn18q080000gq/T//vpx-conf-50871-23808.c:1:

/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/11.0.3/include/arm_neon.h:28:2: error: "NEON support not enabled"

#error "NEON support not enabled"

 ^

1 error generated.

Would be appreciate for any help!

See my reply earlier in the thread for building with the NDK.

 

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