Changelog r25

Changelog

Report issues to GitHub.

For Android Studio issues, follow the docs on the Android Studio site.

If you're a build system maintainer that needs to use the tools in the NDK directly, see the [build system maintainers guide].

Changes

• Includes Android-T (Tiramisu) Beta 1 APIs.
• Eliminates duplicate static libraries in API-versioned sysroot directories. This reduces the uncompressed size of the NDK from 2.1G to 1.6G.

Known Issues

This is not intended to be a comprehensive list of all outstanding bugs.

• Issue 360: thread_local variables with non-trivial destructors will cause segfaults if the containing library is dlcloseed. This was fixed in API 28, but code running on devices older than API 28 will need a workaround. The simplest fix is to stop calling dlclose. If you absolutely must continue calling dlclose, see the following table:

  	Pre-API 23	APIs 23-27	API 28+
  No workarounds	Works for static STL	Broken	Works
  -Wl,-z,nodelete	Works for static STL	Works	Works
  No dlclose	Works	Works	Works

  If your code must run on devices older than M (API 23) and you cannot use the static STL (common), the only fix is to not call dlclose, or to stop using thread_local variables with non-trivial destructors.

  If your code does not need to run on devices older than API 23 you can link with -Wl,-z,nodelete, which instructs the linker to ignore dlclose for that library. You can backport this behavior by not calling dlclose.

  The fix in API 28 is the standardized inhibition of dlclose, so you can backport the fix to older versions by not calling dlclose.

• Issue 988: Exception handling when using ASan via wrap.sh can crash. To workaround this issue when using libc++_shared, ensure that your application's libc++_shared.so is in LD_PRELOAD in your wrap.sh as in the following example:

  #!/system/bin/sh
  HERE="$(cd "$(dirname "$0")" && pwd)"
  export ASAN_OPTIONS=log_to_syslog=false,allow_user_segv_handler=1
  ASAN_LIB=$(ls $HERE/libclang_rt.asan-*-android.so)
  if [ -f "$HERE/libc++_shared.so" ]; then
      # Workaround for https://github.com/android/ndk/issues/988.
      export LD_PRELOAD="$ASAN_LIB $HERE/libc++_shared.so"
  else
      export LD_PRELOAD="$ASAN_LIB"
  fi
  "$@"

  There is no known workaround for libc++_static.

  Note that because this is a platform bug rather than an NDK bug this cannot be fixed with an NDK update. This workaround will be necessary for code running on devices that do not contain the fix, and the bug has not been fixed even in the latest release of Android.