aarch64-linux compile problem

[enh]

sadly building stuff with the NDK can be fun at the best of times, and
strace is actually a pretty hairy project to build. we're working on
improving the NDK (see below) and i'll try to make sure we add some
documentation for what the traditional "configure && make" looks like
with the NDK.

anyway, here's how to build a 32-bit ARM strace 4.15 binary with the NDK:

* download NDK r14 beta 1 from https://github.com/android-ndk/ndk/wiki

* unpack it

* generate a standalone
toolchain[https://developer.android.com/ndk/guides/standalone_toolchain.html]
using unified headers[https://android.googlesource.com/platform/ndk/+/master/docs/UnifiedHeaders.md]:

  ./android-ndk-r14-beta1/build/tools/make_standalone_toolchain.py
--unified-headers --arch arm --api 24 --install-dir /tmp/ndk-arm

* download strace 4.15

* unpack it

* hack a couple of things:

  1. strace seems to need mtd/mtd-abi.h and mtd/ubi-user.h for mtd.c.
they're not in r14beta1 so you'll need to copy them from
bionic[https://android.googlesource.com/platform/bionic/+/master/libc/kernel/uapi/mtd/]
into /tmp/ndk-arm/sysroot/usr/include/mtd/ (which you'll have to
create).

  this is already fixed in r14 beta 2, but that's held up in QA. sorry.

  2. strace assumes the glibc name __key for the struct ipc64_perm
field.  add these lines to sys/ipc.h in /tmp/ndk-arm:

+#if defined(__USE_GNU)
+#define __key key
+#define __seq seq
+#endif

  i'll add that to
bionic[https://android-review.googlesource.com/#/c/329669/] and it'll
be in a future NDK release.

* setup:

  export CC=/tmp/ndk-arm/bin/arm-linux-androideabi-clang
  export CFLAGS="-fPIE -fPIC -pie"
  ./configure --host=arm-linux-androideabi
  make

* push the resulting "strace" to your device and use it.

  $ adb push strace /data/local/tmp/strace
  $ adb shell /data/local/tmp/strace -V
  strace -- version 4.15
  $

  (i actually traced a real executable, but the output of -V was less
spammy for the purposes of this email.)

On Thu, Jan 26, 2017 at 7:31 AM, Larry Dickson <tjoccam at tjoccam.com> wrote:
> Hello strace developers,
>
> After discovering that the Samsung S2 T710 Android tablet is really 32 bit,
> we attempted to cross-compile strace using the NDK in 32 bits. Again I went
> for android-ndk-r13b-linux-x86_64.zip, which is in
>
>
> https://developer.android.com/ndk/downloads/index.html
>
> and brought it up according to
>
> http://nickdesaulniers.github.io/blog/2016/07/01/android-cli/
>
> (except for the source fetch, which was just a download). OK.
>
>
> Instead of aarch64-linux-android-gcc I used arm-linux-androideabi-gcc, and
> similar for strip; instead of --host=aarch64-linux I used --host=arm-linux.
> ./configure worked but not make, which failed quickly on
>
> print_msgbuf.c:35:21: fatal error: sys/msg.h: No such file or directory
>
> Are there any known paths to successful compilation of strace for the
> Android?
>
> Larry Dickson
> Space Sciences Corporation
>
> On Jan 24, 2017, at 8:15 AM, Larry Dickson <tjoccam at tjoccam.com> wrote:
>
> Hello strace developers,
>
> We need strace on our Samsung S2 T710 Android tablet, and I tried to
> cross-compile it on our Dell XPS-13 (Ubuntu 14.04 LTS) laptop. I went for
> android-ndk-r13b-linux-x86_64.zip, which is in
>
> https://developer.android.com/ndk/downloads/index.html
>
> and brought it up according to
>
> http://nickdesaulniers.github.io/blog/2016/07/01/android-cli/
>
> (except for the source fetch, which was just a download). OK. Then I
> downloaded strace-4.15.tar.xz from sourceforge and followed Muzso
>
> http://muzso.hu/2012/04/21/how-to-compile-strace-for-use-on-an-android-phone-running-an-arm-cpu
>
> except that I fixed the names and substituted aarch64-linux for arm-linux in
> the ./configure, which worked. (I used aarch64-linux instead of arm-linux
> because our device CPU is an Exynos 5433, which is an ARMx8-A.)
>
> The make failed with error
>
> # error struct flock64 definition not found in <linux/fcntl.h>
>
> which is an error discussed nowhere on the web, though I can find struct . .
> . fcntl.h> in three source files.
>
> Thank you for any help you can give!
>
> Larry Dickson
> Space Sciences Corporation
>
>
>
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>



-- 
Elliott Hughes - http://who/enh - http://jessies.org/~enh/
Android native code/tools questions? Mail me/drop by/add me as a reviewer.