stl gnustl and libc++

[santo4ul]

Hi,

I'm trying to compile ARM NN using Android toolchain (aarch64-linux-android-)

ACL recomends using "--stl gnustl" here

ARM NN recommends using "--stl=libc++" here

Currently I have two standalone toolchains. One to build ACL (with gnustl), the other to build ARM NN using libc++.

Is this the right way to do? Would there be any conflicts with the final library/exec?

Thanks,
San

[MatteoArm]

Hi @santo4ul, that would probably result in errors when linking ACL in ArmNN.
I'd recommend keeping the same stl for all component builds, or the same NDK toolchain entirely.

[MatteoArm]

I just noticed that you indeed have linker errors related to the stl version (#35).

[santo4ul]

Thanks MatteoArm.

The problem is, ACL recommends using gnustl with the following warning/attention. How do we go about it. We may endup with runtime errors, I'm not sure.

Attention
Due to some NDK issues make sure you use clang++ & gnustl

Thanks,
San

[MatteoArm]

I just spoke with the Compute Library team and they confirmed that they already have plans to switch to libc++ over gnustl, updating also to NDK r17.

Building everything with r16b and libc++ is ok for the time being.

[santo4ul]

Thank you @MatteoArm for the confirmation.