[yocto] libstdc++fs on toolchain

[João Gonçalves]

Hello,
I'm trying to build a c++ cross toolchain to compile to imx6 (armv7). But I
need libstdc++fs library, which does not come with it. Until gcc 8.0 this
is an experimental library.

I've tested with gcc 7.3 and with gcc 8.2 and and none have the libstdc++fs
library.
On my host machine the library is at
/usr/lib/gcc/x86_64-linux-gnu/7/libstdc++fs.a

Does anyone know how to include this library on a yocto generated toolchain?

Thank you,
Joao Goncalves
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