BUILD: Building for Android AARCH64 on Linux

Cannot build for Android AARCH64.

Build for Android ARM32 works fine.

I initialize my toolchain like,

../ndk/android-ndk-r13b/build/tools/make-standalone-toolchain.sh --arch=arm --platform=android-21 --install-dir=android-ndk-21 --toolchain=arm-linux-androideabi-4.9

Replace linkers:

ln -sf arm-linux-androideabi-ld.bfd bin/arm-linux-androideabi-ld

ln -sf ld.bfd arm-linux-androideabi/bin/ld

cmake -DCMAKE_TOOLCHAIN_FILE=/root/dr/dynamorio/make/toolchain-android.cmake -DANDROID_TOOLCHAIN=/root/dr/android-ndk-21/ -DDR_COPY_TO_DEVICE=ON DYNAMORIO_CONFIGDIR=/sdcard/dynamo/ -DTARGET_ABI=arm-linux-androideabi /root/dr/dynamorio/

make -j

works fine.

Then if I try to do the same, but for aarch64 it fails:

../ndk/android-ndk-r13b/build/tools/make-standalone-toolchain.sh --arch=arm64 --platform=android-21 --install-dir=android-ndk-21-64 --toolchain=aarch64-linux-android-4.9

ln -sf aarch64-linux-android-ld.bfd bin/aarch64-linux-android-ld

ln -sf ld.bfd aarch64-linux-android/bin/ld

I tried this cmake line:

cmake -DCMAKE_TOOLCHAIN_FILE=/root/dr/dynamorio/make/toolchain-android.cmake -DANDROID_TOOLCHAIN=/root/dr/android-ndk-21-64/ -DDR_COPY_TO_DEVICE=ON DYNAMORIO_CONFIGDIR=/sdcard/dynamo/ -DTARGET_ABI=aarch64-linux-android /root/dr/dynamorio/

and it errors with

-- Performing Test no_pie_avail - Failed

CMake Error at /root/dr/build_android_64/cmake/DynamoRIOConfig.cmake:1069 (message):

  *** /root/dr/android-ndk-21-64/bin/aarch64-linux-android-ld.bfd failed: ***


  /root/dr/android-ndk-21-64/bin/aarch64-linux-android-ld.bfd: unrecognised

  emulation mode: elf_x86_64

  Supported emulations: aarch64linux aarch64elf aarch64elf32 aarch64elf32b

  aarch64elfb armelf armelfb aarch64linuxb aarch64linux32 aarch64linux32b

  armelfb_linux_eabi armelf_linux_eabi

Call Stack (most recent call first):

  clients/drcov/CMakeLists.txt:43 (configure_DynamoRIO_client)

-- Configuring incomplete, errors occurred!

So I tried with:

cmake -DCMAKE_TOOLCHAIN_FILE=/root/dr/dynamorio/make/toolchain-android.cmake -DANDROID_TOOLCHAIN=/root/dr/android-ndk-21-64/ -DDR_COPY_TO_DEVICE=ON DYNAMORIO_CONFIGDIR=/sdcard/dynamo/ -DTARGET_ABI=aarch64-linux-android -DCMAKE_SYSTEM_PROCESSOR=aarch64 /root/dr/dynamorio/

The cmake runs fine, but then when I build it with make -j, it errors with:

[  3%] Linking C executable ../bin64/drloader

In file included from /root/dr/dynamorio/core/lib/../globals.h:332:0,

                 from /root/dr/dynamorio/core/lib/dr_helper.c:40:

/root/dr/dynamorio/core/unix/os_exports.h:122:5: error: #error NYI

 #   error NYI

     ^

/root/dr/dynamorio/core/unix/os_exports.h:328:0: error: "_NSIG_BPW" redefined [-Werror]

 # define _NSIG_BPW 64

 ^

In file included from /root/dr/android-ndk-21-64/sysroot/usr/include/asm/signal.h:22:0,

                 from /root/dr/android-ndk-21-64/sysroot/usr/include/linux/signal.h:21,

                 from /root/dr/android-ndk-21-64/sysroot/usr/include/signal.h:43,

                 from /root/dr/dynamorio/core/lib/globals_shared.h:126,

                 from /root/dr/dynamorio/core/lib/../globals.h:90,

                 from /root/dr/dynamorio/core/lib/dr_helper.c:40:

/root/dr/android-ndk-21-64/sysroot/usr/include/asm-generic/signal.h:24:0: note: this is the location of the previous definition

 #define _NSIG_BPW __BITS_PER_LONG

 ^

In file included from /root/dr/dynamorio/core/lib/../globals.h:332:0,

                 from /root/dr/dynamorio/core/lib/dr_helper.c:40:

/root/dr/dynamorio/core/unix/os_exports.h:334:0: error: "_NSIG_WORDS" redefined [-Werror]

 # define _NSIG_WORDS (MAX_SIGNUM / _NSIG_BPW)

 ^

In file included from /root/dr/android-ndk-21-64/sysroot/usr/include/asm/signal.h:22:0,

                 from /root/dr/android-ndk-21-64/sysroot/usr/include/linux/signal.h:21,

                 from /root/dr/android-ndk-21-64/sysroot/usr/include/signal.h:43,

                 from /root/dr/dynamorio/core/lib/globals_shared.h:126,

                 from /root/dr/dynamorio/core/lib/../globals.h:90,

                 from /root/dr/dynamorio/core/lib/dr_helper.c:40:

/root/dr/android-ndk-21-64/sysroot/usr/include/asm-generic/signal.h:25:0: note: this is the location of the previous definition

 #define _NSIG_WORDS (_KERNEL__NSIG / _NSIG_BPW)

 ^

cc1: all warnings being treated as errors

core/CMakeFiles/drhelper.dir/build.make:104: recipe for target 'core/CMakeFiles/drhelper.dir/lib/dr_helper.c.o' failed

make[2]: *** [core/CMakeFiles/drhelper.dir/lib/dr_helper.c.o] Error 1

CMakeFiles/Makefile2:167: recipe for target 'core/CMakeFiles/drhelper.dir/all' failed

make[1]: *** [core/CMakeFiles/drhelper.dir/all] Error 2

Reproduce the AARCH64 configuration with make/toolchain-android.cmake and compare it with the working ARM32 build. Read CMake DynamoRIOConfig.cmake, clients/drcov/CMakeLists.txt, core/unix/os_exports.h, and core/lib/dr_helper.c around the reported failures. Done means the documented AARCH64 Android configuration and build complete without the linker or NYI errors.

Written by the indexing model from the issue text.