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# 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].
[GitHub]: https://github.com/android/ndk/issues
[Android Studio site]: http://tools.android.com/filing-bugs
[build system maintainers guide]: https://android.googlesource.com/platform/ndk/+/master/docs/BuildSystemMaintainers.md
## r25b
* [Issue 1739]: Fixed C compatibility issue in `amidi/AMidi.h`.
* [Issue 1740]: Fixed the legacy toolchain when using CMake's `Release` build
configuration. Since r23b it has not be receiving any optimization flag. It
will now receive `-O3`. If you're building with AGP and haven't overridden
AGP's default CMake modes, this change does not affect you, as AGP uses
`RelWithDebInfo` by default.
* [Issue 1744]: Fixes ASan wrap.sh file to support 32-bit apps on 64-bit
devices.
[Issue 1739]: https://github.com/android/ndk/issues/1739
[Issue 1740]: https://github.com/android/ndk/issues/1740
[Issue 1744]: https://github.com/android/ndk/issues/1744
## Changes
* Includes Android 13 APIs.
* Updated LLVM to clang-r450784d, based on LLVM 14 development.
* [Issue 1455]: Improved display of Android API levels in Clang diagnostics.
* [Issue 1608]: Fixed crash in vector conversions.
* [Issue 1710]: Fixed compiler crash caused by invalid `-march` values.
* Eliminate duplicate static libraries in API-versioned sysroot directories.
This reduces the uncompressed size of the NDK by 500 MB.
* Strip some binaries and libraries. This reduces the uncompressed size of
the NDK by 300 MB.
* Remove python2. All scripts now use python3.
* [Issue 933]: Updated reference ASan wrap.sh to support attaching the Java
debugger.
* [Issue 1334]: Improved argument escaping for compile_commands.json files
generated by ndk-build.
* [Issue 1634]: Fixed the build rule for the libshaderc_combined target.
* [Issue 1693]: The NDK's toolchain file for CMake (`android.toolchain.cmake`)
defaults to the legacy toolchain file for all versions of CMake. The new
toolchain file can still be enabled using
`-DANDROID_USE_LEGACY_TOOLCHAIN_FILE=OFF`.
* [Issue 1717]: Arranged for --gc-sections to be passed to the linker when
building shared libraries.
[Issue 933]: https://github.com/android/ndk/issues/933
[Issue 1334]: https://github.com/android/ndk/issues/1334
[Issue 1455]: https://github.com/android/ndk/issues/1455
[Issue 1608]: https://github.com/android/ndk/issues/1608
[Issue 1634]: https://github.com/android/ndk/issues/1634
[Issue 1693]: https://github.com/android/ndk/issues/1693
[Issue 1710]: https://github.com/android/ndk/issues/1710
[Issue 1717]: https://github.com/android/ndk/issues/1717
## 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 `dlclose`ed. 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:
```bash
#!/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.
[Issue 360]: https://github.com/android/ndk/issues/360
[Issue 988]: https://github.com/android/ndk/issues/988
|
