Host API Level about termux-ndk HOT 2 CLOSED

I have managed to use termux-ndk(openjdk-11.0.1 ndk-r21 android-sdk(build-tools:29.0.3 platforms:android-29)) to build a project(without gradle).
Here's some problems I encountered. I think the host API level of the prebuilt JDK, NDK and SDK need to be presented.

1)Firstly I tried to build my project on a Android 8.1 device. The compilation was fine, but there was an error during linking, saying:

CANNOT LINK EXECUTABLE "/data/data/com.termux/files/home/android-ndk-r21/toolchains/llvm/prebuilt/linux-aarch64/bin/../lib/gcc/aarch64-linux-android/4.9.x/../../../../aarch64-linux-android/bin/ld": cannot locate symbol "glob" referenced by "/data/data/com.termux/files/home/android-ndk-r21/toolchains/aarch64-linux-android-4.9/prebuilt/linux-aarch64/bin/aarch64-linux-android-ld"...

Which I think is caused by lacking "glob" function in libc.so.
I have searched the web and found something saying glob was added to Bionic on API Level 28 (Android 9). Termux now targets API Level 24 (Android 7.0) and includes a compatibility library libandroid-glob.

https://github.com/android/ndk/issues/126
https://github.com/termux/termux-packages/tree/master/packages/libandroid-glob

2)Then I switched to a Android 10 device and encountered a error during static library build, saying:

CANNOT LINK EXECUTABLE "/data/data/com.termux/files/home/android-ndk-r21/toolchains/llvm/prebuilt/linux-aarch64/bin/llvm-ar": library "libc++_shared.so" not found

I found android-ndk-r21/toolchains/llvm/prebuilt/linux-aarch64/lib64/libc++.so.1 is the library that references libc++_shared.so. But I checked its import functions and found it doesn't import any functions from libc++_shared.so. I think there may be a problem with its build process. Anyway, I copied libc++_shared.so from <NDK_PATH>\toolchains\llvm\prebuilt\windows-x86_64\sysroot\usr\lib\aarch64-linux-android\libc++_shared.so on my Windows machine and it works.

3)The third problem is trivial and it is in d8 tool, which relies 'java' in PATH environment variable.

/data/data/com.termux/files/home/android-sdk/build-tools/29.0.3/d8: line 89: exec: java: not found

I fixed it by add a symbol link, and I think it's better documented in the readme.

ln -s /data/data/com.termux/files/home/openjdk-11.0.1/bin/java /data/data/com.termux/files/usr/bin/java

I haven't tested the build of the project without gradle，so there may be some problems, thank you for your reply, the next version of r22 may test and fix these problems！

from termux-ndk.

By the way, I have patched aarch64-linux-android-ld and libc++.so.1 with patchelf and it works great without problem on my Android 8.1 and 10.0 devices.

./patchelf --add-needed libandroid-glob.so aarch64-linux-android-ld
./patchelf --remove-needed libc++_shared.so libc++.so.1

from termux-ndk.